/usr/include/kttimeddb.h is in libkyototycoon-dev 0.9.56-1.
This file is owned by root:root, with mode 0o644.
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2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 | /*************************************************************************************************
* Timed database
* Copyright (C) 2009-2012 FAL Labs
* This file is part of Kyoto Tycoon.
* This program is free software: you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation, either version
* 3 of the License, or any later version.
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*************************************************************************************************/
#ifndef _KTTIMEDDB_H // duplication check
#define _KTTIMEDDB_H
#include <ktcommon.h>
#include <ktutil.h>
#include <ktulog.h>
#include <ktshlib.h>
namespace kyototycoon { // common namespace
/**
* Timed database.
* @note This class is a concrete class of a wrapper for the polymorphic database to add
* expiration features. This class can be inherited but overwriting methods is forbidden.
* Before every database operation, it is necessary to call the TimedDB::open method in order to
* open a database file and connect the database object to it. To avoid data missing or
* corruption, it is important to close every database file by the TimedDB::close method when
* the database is no longer in use. It is forbidden for multible database objects in a process
* to open the same database at the same time.
*/
class TimedDB {
public:
class Cursor;
class Visitor;
class UpdateTrigger;
/** The width of expiration time. */
static const int32_t XTWIDTH = 5;
/** The maximum number of expiration time. */
static const int64_t XTMAX = (1LL << (XTWIDTH * 8)) - 1;
private:
class TimedVisitor;
class TimedMetaTrigger;
struct MergeLine;
/* The magic data of the database type. */
static const uint8_t MAGICDATA = 0xbb;
/* The score unit of expiratoin. */
static const int64_t XTSCUNIT = 256;
/* The inverse frequency of reading expiration. */
static const int64_t XTREADFREQ = 8;
/* The inverse frequency of iterating expiration. */
static const int64_t XTITERFREQ = 4;
/* The unit step number of expiration. */
static const int64_t XTUNIT = 8;
/* The size of the logging buffer. */
static const size_t LOGBUFSIZ = 1024;
public:
/**
* Cursor to indicate a record.
*/
class Cursor {
friend class TimedDB;
public:
/**
* Constructor.
* @param db the container database object.
*/
explicit Cursor(TimedDB* db) : db_(db), cur_(NULL), back_(false) {
_assert_(db);
cur_ = db_->db_.cursor();
}
/**
* Destructor.
*/
virtual ~Cursor() {
_assert_(true);
delete cur_;
}
/**
* Jump the cursor to the first record for forward scan.
* @return true on success, or false on failure.
*/
bool jump() {
_assert_(true);
if (!cur_->jump()) return false;
back_ = false;
return true;
}
/**
* Jump the cursor to a record for forward scan.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @return true on success, or false on failure.
*/
bool jump(const char* kbuf, size_t ksiz) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
if (!cur_->jump(kbuf, ksiz)) return false;
back_ = false;
return true;
}
/**
* Jump the cursor to a record for forward scan.
* @note Equal to the original Cursor::jump method except that the parameter is std::string.
*/
bool jump(const std::string& key) {
_assert_(true);
return jump(key.c_str(), key.size());
}
/**
* Jump the cursor to the last record for backward scan.
* @return true on success, or false on failure.
* @note This method is dedicated to tree databases. Some database types, especially hash
* databases, may provide a dummy implementation.
*/
bool jump_back() {
_assert_(true);
if (!cur_->jump_back()) return false;
back_ = true;
return true;
}
/**
* Jump the cursor to a record for backward scan.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @return true on success, or false on failure.
* @note This method is dedicated to tree databases. Some database types, especially hash
* databases, will provide a dummy implementation.
*/
bool jump_back(const char* kbuf, size_t ksiz) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
if (!cur_->jump_back(kbuf, ksiz)) return false;
back_ = true;
return true;
}
/**
* Jump the cursor to a record for backward scan.
* @note Equal to the original Cursor::jump_back method except that the parameter is
* std::string.
*/
bool jump_back(const std::string& key) {
_assert_(true);
return jump_back(key.c_str(), key.size());
}
/**
* Step the cursor to the next record.
* @return true on success, or false on failure.
*/
bool step() {
_assert_(true);
if (!cur_->step()) return false;
back_ = false;
return true;
}
/**
* Step the cursor to the previous record.
* @return true on success, or false on failure.
* @note This method is dedicated to tree databases. Some database types, especially hash
* databases, may provide a dummy implementation.
*/
bool step_back() {
_assert_(true);
if (!cur_->step_back()) return false;
back_ = true;
return true;
}
/**
* Accept a visitor to the current record.
* @param visitor a visitor object.
* @param writable true for writable operation, or false for read-only operation.
* @param step true to move the cursor to the next record, or false for no move.
* @return true on success, or false on failure.
* @note the operation for each record is performed atomically and other threads accessing
* the same record are blocked.
*/
bool accept(Visitor* visitor, bool writable = true, bool step = false) {
_assert_(visitor);
bool err = false;
int64_t ct = std::time(NULL);
while (true) {
TimedVisitor myvisitor(db_, visitor, ct, true);
if (!cur_->accept(&myvisitor, writable, step)) {
err = true;
break;
}
if (myvisitor.again()) {
if (!step && !(back_ ? cur_->step_back() : cur_->step())) {
err = true;
break;
}
continue;
}
break;
}
if (db_->xcur_) {
int64_t xtsc = writable ? XTSCUNIT : XTSCUNIT / XTREADFREQ;
if (!db_->expire_records(xtsc)) err = true;
}
return !err;
}
/**
* Set the value of the current record.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @param step true to move the cursor to the next record, or false for no move.
* @return true on success, or false on failure.
*/
bool set_value(const char* vbuf, size_t vsiz, int64_t xt = kc::INT64MAX, bool step = false) {
_assert_(vbuf && vsiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const char* vbuf, size_t vsiz, int64_t xt) :
vbuf_(vbuf), vsiz_(vsiz), xt_(xt), ok_(false) {}
bool ok() const {
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
ok_ = true;
*sp = vsiz_;
*xtp = xt_;
return vbuf_;
}
const char* vbuf_;
size_t vsiz_;
int64_t xt_;
bool ok_;
};
VisitorImpl visitor(vbuf, vsiz, xt);
if (!accept(&visitor, true, step)) return false;
if (!visitor.ok()) return false;
return true;
}
/**
* Set the value of the current record.
* @note Equal to the original Cursor::set_value method except that the parameter is
* std::string.
*/
bool set_value_str(const std::string& value, int64_t xt = kc::INT64MAX, bool step = false) {
_assert_(true);
return set_value(value.c_str(), value.size(), xt, step);
}
/**
* Remove the current record.
* @return true on success, or false on failure.
* @note If no record corresponds to the key, false is returned. The cursor is moved to the
* next record implicitly.
*/
bool remove() {
_assert_(true);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : ok_(false) {}
bool ok() const {
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
ok_ = true;
return REMOVE;
}
bool ok_;
};
VisitorImpl visitor;
if (!accept(&visitor, true, false)) return false;
if (!visitor.ok()) return false;
return true;
}
/**
* Get the key of the current record.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param step true to move the cursor to the next record, or false for no move.
* @return the pointer to the key region of the current record, or NULL on failure.
* @note If the cursor is invalidated, NULL is returned. Because an additional zero
* code is appended at the end of the region of the return value, the return value can be
* treated as a C-style string. Because the region of the return value is allocated with the
* the new[] operator, it should be released with the delete[] operator when it is no longer
* in use.
*/
char* get_key(size_t* sp, bool step = false) {
_assert_(sp);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : kbuf_(NULL), ksiz_(0) {}
char* pop(size_t* sp) {
*sp = ksiz_;
return kbuf_;
}
void clear() {
delete[] kbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
kbuf_ = new char[ksiz+1];
std::memcpy(kbuf_, kbuf, ksiz);
kbuf_[ksiz] = '\0';
ksiz_ = ksiz;
return NOP;
}
char* kbuf_;
size_t ksiz_;
};
VisitorImpl visitor;
if (!accept(&visitor, false, step)) {
visitor.clear();
*sp = 0;
return NULL;
}
size_t ksiz;
char* kbuf = visitor.pop(&ksiz);
if (!kbuf) {
*sp = 0;
return NULL;
}
*sp = ksiz;
return kbuf;
}
/**
* Get the key of the current record.
* @note Equal to the original Cursor::get_key method except that a parameter is a string to
* contain the result and the return value is bool for success.
*/
bool get_key(std::string* key, bool step = false) {
_assert_(key);
size_t ksiz;
char* kbuf = get_key(&ksiz, step);
if (!kbuf) return false;
key->clear();
key->append(kbuf, ksiz);
delete[] kbuf;
return true;
}
/**
* Get the value of the current record.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param step true to move the cursor to the next record, or false for no move.
* @return the pointer to the value region of the current record, or NULL on failure.
* @note If the cursor is invalidated, NULL is returned. Because an additional zero
* code is appended at the end of the region of the return value, the return value can be
* treated as a C-style string. Because the region of the return value is allocated with the
* the new[] operator, it should be released with the delete[] operator when it is no longer
* in use.
*/
char* get_value(size_t* sp, bool step = false) {
_assert_(sp);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : vbuf_(NULL), vsiz_(0) {}
char* pop(size_t* sp) {
*sp = vsiz_;
return vbuf_;
}
void clear() {
delete[] vbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
vbuf_ = new char[vsiz+1];
std::memcpy(vbuf_, vbuf, vsiz);
vbuf_[vsiz] = '\0';
vsiz_ = vsiz;
return NOP;
}
char* vbuf_;
size_t vsiz_;
};
VisitorImpl visitor;
if (!accept(&visitor, false, step)) {
visitor.clear();
*sp = 0;
return NULL;
}
size_t vsiz;
char* vbuf = visitor.pop(&vsiz);
if (!vbuf) {
*sp = 0;
return NULL;
}
*sp = vsiz;
return vbuf;
}
/**
* Get the value of the current record.
* @note Equal to the original Cursor::get_value method except that a parameter is a string
* to contain the result and the return value is bool for success.
*/
bool get_value(std::string* value, bool step = false) {
_assert_(value);
size_t vsiz;
char* vbuf = get_value(&vsiz, step);
if (!vbuf) return false;
value->clear();
value->append(vbuf, vsiz);
delete[] vbuf;
return true;
}
/**
* Get a pair of the key and the value of the current record.
* @param ksp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param vbp the pointer to the variable into which the pointer to the value region is
* assigned.
* @param vsp the pointer to the variable into which the size of the value region is
* assigned.
* @param xtp the pointer to the variable into which the absolute expiration time is
* assigned. If it is NULL, it is ignored.
* @param step true to move the cursor to the next record, or false for no move.
* @return the pointer to the pair of the key region, or NULL on failure.
* @note If the cursor is invalidated, NULL is returned. Because an additional zero code is
* appended at the end of each region of the key and the value, each region can be treated
* as a C-style string. The return value should be deleted explicitly by the caller with
* the detele[] operator.
*/
char* get(size_t* ksp, const char** vbp, size_t* vsp, int64_t* xtp = NULL,
bool step = false) {
_assert_(ksp && vbp && vsp);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : kbuf_(NULL), ksiz_(0), vbuf_(NULL), vsiz_(0), xt_(0) {}
char* pop(size_t* ksp, const char** vbp, size_t* vsp, int64_t* xtp) {
*ksp = ksiz_;
*vbp = vbuf_;
*vsp = vsiz_;
if (xtp) *xtp = xt_;
return kbuf_;
}
void clear() {
delete[] kbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
size_t rsiz = ksiz + 1 + vsiz + 1;
kbuf_ = new char[rsiz];
std::memcpy(kbuf_, kbuf, ksiz);
kbuf_[ksiz] = '\0';
ksiz_ = ksiz;
vbuf_ = kbuf_ + ksiz + 1;
std::memcpy(vbuf_, vbuf, vsiz);
vbuf_[vsiz] = '\0';
vsiz_ = vsiz;
xt_ = *xtp;
return NOP;
}
char* kbuf_;
size_t ksiz_;
char* vbuf_;
size_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor;
if (!accept(&visitor, false, step)) {
visitor.clear();
*ksp = 0;
*vbp = NULL;
*vsp = 0;
if (xtp) *xtp = 0;
return NULL;
}
return visitor.pop(ksp, vbp, vsp, xtp);
}
/**
* Get a pair of the key and the value of the current record.
* @note Equal to the original Cursor::get method except that parameters are strings
* to contain the result and the return value is bool for success.
*/
bool get(std::string* key, std::string* value, int64_t* xtp = NULL, bool step = false) {
_assert_(key && value);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(std::string* key, std::string* value) :
key_(key), value_(value), xt_(0), ok_(false) {}
bool ok(int64_t* xtp) {
if (xtp) *xtp = xt_;
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
key_->clear();
key_->append(kbuf, ksiz);
value_->clear();
value_->append(vbuf, vsiz);
xt_ = *xtp;
ok_ = true;
return NOP;
}
std::string* key_;
std::string* value_;
int64_t xt_;
bool ok_;
};
VisitorImpl visitor(key, value);
if (!accept(&visitor, false, step)) return false;
return visitor.ok(xtp);
}
/**
* Get a pair of the key and the value of the current record and remove it atomically.
* @param ksp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param vbp the pointer to the variable into which the pointer to the value region is
* assigned.
* @param vsp the pointer to the variable into which the size of the value region is
* assigned.
* @param xtp the pointer to the variable into which the absolute expiration time is
* assigned. If it is NULL, it is ignored.
* @return the pointer to the pair of the key region, or NULL on failure.
* @note If the cursor is invalidated, NULL is returned. Because an additional zero code is
* appended at the end of each region of the key and the value, each region can be treated
* as a C-style string. The return value should be deleted explicitly by the caller with
* the detele[] operator.
*/
char* seize(size_t* ksp, const char** vbp, size_t* vsp, int64_t* xtp = NULL) {
_assert_(ksp && vbp && vsp);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : kbuf_(NULL), ksiz_(0), vbuf_(NULL), vsiz_(0), xt_(0) {}
char* pop(size_t* ksp, const char** vbp, size_t* vsp, int64_t* xtp) {
*ksp = ksiz_;
*vbp = vbuf_;
*vsp = vsiz_;
if (xtp) *xtp = xt_;
return kbuf_;
}
void clear() {
delete[] kbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
size_t rsiz = ksiz + 1 + vsiz + 1;
kbuf_ = new char[rsiz];
std::memcpy(kbuf_, kbuf, ksiz);
kbuf_[ksiz] = '\0';
ksiz_ = ksiz;
vbuf_ = kbuf_ + ksiz + 1;
std::memcpy(vbuf_, vbuf, vsiz);
vbuf_[vsiz] = '\0';
vsiz_ = vsiz;
xt_ = *xtp;
return REMOVE;
}
char* kbuf_;
size_t ksiz_;
char* vbuf_;
size_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor;
if (!accept(&visitor, true, false)) {
visitor.clear();
*ksp = 0;
*vbp = NULL;
*vsp = 0;
if (xtp) *xtp = 0;
return NULL;
}
return visitor.pop(ksp, vbp, vsp, xtp);
}
/**
* Get a pair of the key and the value of the current record and remove it atomically.
* @note Equal to the original Cursor::seize method except that parameters are strings
* to contain the result and the return value is bool for success.
*/
bool seize(std::string* key, std::string* value, int64_t* xtp = NULL) {
_assert_(key && value);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(std::string* key, std::string* value) :
key_(key), value_(value), xt_(0), ok_(false) {}
bool ok(int64_t* xtp) {
if (xtp) *xtp = xt_;
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
key_->clear();
key_->append(kbuf, ksiz);
value_->clear();
value_->append(vbuf, vsiz);
xt_ = *xtp;
ok_ = true;
return REMOVE;
}
std::string* key_;
std::string* value_;
int64_t xt_;
bool ok_;
};
VisitorImpl visitor(key, value);
if (!accept(&visitor, true, false)) return false;
return visitor.ok(xtp);
}
/**
* Get the database object.
* @return the database object.
*/
TimedDB* db() {
_assert_(true);
return db_;
}
/**
* Get the last happened error.
* @return the last happened error.
*/
kc::BasicDB::Error error() {
_assert_(true);
return db()->error();
}
private:
/** Dummy constructor to forbid the use. */
Cursor(const Cursor&);
/** Dummy Operator to forbid the use. */
Cursor& operator =(const Cursor&);
/** The inner database. */
TimedDB* db_;
/** The inner cursor. */
kc::BasicDB::Cursor* cur_;
/** The backward flag. */
bool back_;
};
/**
* Interface to access a record.
*/
class Visitor {
public:
/** Special pointer for no operation. */
static const char* const NOP;
/** Special pointer to remove the record. */
static const char* const REMOVE;
/**
* Destructor.
*/
virtual ~Visitor() {
_assert_(true);
}
/**
* Visit a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param xtp the pointer to the variable into which the expiration time from now in seconds
* is assigned. The initial value is the absolute expiration time.
* @return If it is the pointer to a region, the value is replaced by the content. If it
* is Visitor::NOP, nothing is modified. If it is Visitor::REMOVE, the record is removed.
*/
virtual const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && vbuf && vsiz <= kc::MEMMAXSIZ && sp && xtp);
return NOP;
}
/**
* Visit a empty record space.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param xtp the pointer to the variable into which the expiration time from now in seconds
* is assigned.
* @return If it is the pointer to a region, the value is replaced by the content. If it
* is Visitor::NOP or Visitor::REMOVE, nothing is modified.
*/
virtual const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && sp && xtp);
return NOP;
}
/**
* Preprocess the main operations.
*/
virtual void visit_before() {
_assert_(true);
}
/**
* Postprocess the main operations.
*/
virtual void visit_after() {
_assert_(true);
}
};
/**
* Interface to trigger update operations.
*/
class UpdateTrigger {
public:
/**
* Destructor.
*/
virtual ~UpdateTrigger() {
_assert_(true);
}
/**
* Trigger an update operation.
* @param mbuf the pointer to the message region.
* @param msiz the size of the message region.
*/
virtual void trigger(const char* mbuf, size_t msiz) = 0;
/**
* Begin transaction.
*/
virtual void begin_transaction() = 0;
/**
* End transaction.
* @param commit true to commit the transaction, or false to abort the transaction.
*/
virtual void end_transaction(bool commit) = 0;
};
/**
* Merge modes.
*/
enum MergeMode {
MSET, ///< overwrite the existing value
MADD, ///< keep the existing value
MREPLACE, ///< modify the existing record only
MAPPEND ///< append the new value
};
/**
* Default constructor.
*/
explicit TimedDB() :
xlock_(), db_(), mtrigger_(this), utrigger_(NULL), omode_(0),
opts_(0), capcnt_(0), capsiz_(0), xcur_(NULL), xsc_(0) {
_assert_(true);
db_.tune_meta_trigger(&mtrigger_);
}
/**
* Destructor.
*/
virtual ~TimedDB() {
_assert_(true);
if (omode_ != 0) close();
}
/**
* Set the internal database object.
* @param db the internal database object. Its possession is transferred inside and the
* object is deleted automatically.
* @return true on success, or false on failure.
*/
bool set_internal_db(kc::BasicDB* db) {
_assert_(db);
if (omode_ != 0) {
set_error(kc::BasicDB::Error::INVALID, "already opened");
return false;
}
db_.set_internal_db(db);
return true;
}
/**
* Get the last happened error.
* @return the last happened error.
*/
kc::BasicDB::Error error() const {
_assert_(true);
return db_.error();
}
/**
* Set the error information.
* @param code an error code.
* @param message a supplement message.
*/
void set_error(kc::BasicDB::Error::Code code, const char* message) {
_assert_(message);
db_.set_error(code, message);
}
/**
* Open a database file.
* @param path the path of a database file. The same as with kc::PolyDB. In addition, the
* following tuning parameters are supported. "ktopts" sets options and the value can contain
* "p" for the persistent option. "ktcapcnt" sets the capacity by record number. "ktcapsiz"
* sets the capacity by database size.
* @param mode the connection mode. The same as with kc::PolyDB.
* @return true on success, or false on failure.
*/
bool open(const std::string& path = ":",
uint32_t mode = kc::BasicDB::OWRITER | kc::BasicDB::OCREATE) {
_assert_(true);
if (omode_ != 0) {
set_error(kc::BasicDB::Error::INVALID, "already opened");
return false;
}
kc::ScopedSpinLock lock(&xlock_);
std::vector<std::string> elems;
kc::strsplit(path, '#', &elems);
capcnt_ = -1;
capsiz_ = -1;
opts_ = 0;
std::vector<std::string>::iterator it = elems.begin();
std::vector<std::string>::iterator itend = elems.end();
if (it != itend) ++it;
while (it != itend) {
std::vector<std::string> fields;
if (kc::strsplit(*it, '=', &fields) > 1) {
const char* key = fields[0].c_str();
const char* value = fields[1].c_str();
if (!std::strcmp(key, "ktcapcnt") || !std::strcmp(key, "ktcapcount") ||
!std::strcmp(key, "ktcap_count")) {
capcnt_ = kc::atoix(value);
} else if (!std::strcmp(key, "ktcapsiz") || !std::strcmp(key, "ktcapsize") ||
!std::strcmp(key, "ktcap_size")) {
capsiz_ = kc::atoix(value);
} else if (!std::strcmp(key, "ktopts") || !std::strcmp(key, "ktoptions")) {
if (std::strchr(value, 'p')) opts_ |= TPERSIST;
}
}
++it;
}
if (!db_.open(path, mode)) return false;
kc::BasicDB* idb = db_.reveal_inner_db();
if (idb) {
const std::type_info& info = typeid(*idb);
if (info == typeid(kc::HashDB)) {
kc::HashDB* hdb = (kc::HashDB*)idb;
char* opq = hdb->opaque();
if (opq) {
if (*(uint8_t*)opq == MAGICDATA) {
opts_ = *(uint8_t*)(opq + 1);
} else if ((mode & kc::BasicDB::OWRITER) && hdb->count() < 1) {
*(uint8_t*)opq = MAGICDATA;
*(uint8_t*)(opq + 1) = opts_;
hdb->synchronize_opaque();
}
}
} else if (info == typeid(kc::TreeDB)) {
kc::TreeDB* tdb = (kc::TreeDB*)idb;
char* opq = tdb->opaque();
if (opq) {
if (*(uint8_t*)opq == MAGICDATA) {
opts_ = *(uint8_t*)(opq + 1);
} else if ((mode & kc::BasicDB::OWRITER) && tdb->count() < 1) {
*(uint8_t*)opq = MAGICDATA;
*(uint8_t*)(opq + 1) = opts_;
tdb->synchronize_opaque();
}
}
} else if (info == typeid(kc::DirDB)) {
kc::DirDB* ddb = (kc::DirDB*)idb;
char* opq = ddb->opaque();
if (opq) {
if (*(uint8_t*)opq == MAGICDATA) {
opts_ = *(uint8_t*)(opq + 1);
} else if ((mode & kc::BasicDB::OWRITER) && ddb->count() < 1) {
*(uint8_t*)opq = MAGICDATA;
*(uint8_t*)(opq + 1) = opts_;
ddb->synchronize_opaque();
}
}
} else if (info == typeid(kc::ForestDB)) {
kc::ForestDB* fdb = (kc::ForestDB*)idb;
char* opq = fdb->opaque();
if (opq) {
if (*(uint8_t*)opq == MAGICDATA) {
opts_ = *(uint8_t*)(opq + 1);
} else if ((mode & kc::BasicDB::OWRITER) && fdb->count() < 1) {
*(uint8_t*)opq = MAGICDATA;
*(uint8_t*)(opq + 1) = opts_;
fdb->synchronize_opaque();
}
}
}
}
omode_ = mode;
if ((omode_ & kc::BasicDB::OWRITER) && !(opts_ & TPERSIST)) {
xcur_ = db_.cursor();
if (db_.count() > 0) xcur_->jump();
}
xsc_ = 0;
return true;
}
/**
* Close the database file.
* @return true on success, or false on failure.
*/
bool close() {
_assert_(true);
if (omode_ == 0) {
set_error(kc::BasicDB::Error::INVALID, "not opened");
return false;
}
kc::ScopedSpinLock lock(&xlock_);
bool err = false;
delete xcur_;
xcur_ = NULL;
if (!db_.close()) err = true;
omode_ = 0;
return !err;
}
/**
* Accept a visitor to a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param visitor a visitor object.
* @param writable true for writable operation, or false for read-only operation.
* @return true on success, or false on failure.
* @note the operation for each record is performed atomically and other threads accessing the
* same record are blocked.
*/
bool accept(const char* kbuf, size_t ksiz, Visitor* visitor, bool writable = true) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && visitor);
bool err = false;
int64_t ct = std::time(NULL);
TimedVisitor myvisitor(this, visitor, ct, false);
if (!db_.accept(kbuf, ksiz, &myvisitor, writable)) err = true;
if (xcur_) {
int64_t xtsc = writable ? XTSCUNIT : XTSCUNIT / XTREADFREQ;
if (!expire_records(xtsc)) err = true;
}
return !err;
}
/**
* Accept a visitor to multiple records at once.
* @param keys specifies a string vector of the keys.
* @param visitor a visitor object.
* @param writable true for writable operation, or false for read-only operation.
* @return true on success, or false on failure.
* @note The operations for specified records are performed atomically and other threads
* accessing the same records are blocked. To avoid deadlock, any database operation must not
* be performed in this function.
*/
bool accept_bulk(const std::vector<std::string>& keys, Visitor* visitor,
bool writable = true) {
_assert_(visitor);
bool err = false;
int64_t ct = std::time(NULL);
TimedVisitor myvisitor(this, visitor, ct, false);
if (!db_.accept_bulk(keys, &myvisitor, writable)) err = true;
if (xcur_) {
int64_t xtsc = writable ? XTSCUNIT : XTSCUNIT / XTREADFREQ;
if (!expire_records(xtsc)) err = true;
}
return !err;
}
/**
* Iterate to accept a visitor for each record.
* @param visitor a visitor object.
* @param writable true for writable operation, or false for read-only operation.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
* @note The whole iteration is performed atomically and other threads are blocked.
*/
bool iterate(Visitor *visitor, bool writable = true,
kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(visitor);
bool err = false;
int64_t ct = std::time(NULL);
TimedVisitor myvisitor(this, visitor, ct, true);
if (!db_.iterate(&myvisitor, writable, checker)) err = true;
if (xcur_) {
int64_t count = db_.count();
int64_t xtsc = writable ? XTSCUNIT : XTSCUNIT / XTREADFREQ;
if (count > 0) xtsc *= count / XTITERFREQ;
if (!expire_records(xtsc)) err = true;
}
return !err;
}
/**
* Scan each record in parallel.
* @param visitor a visitor object.
* @param thnum the number of worker threads.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
* @note This function is for reading records and not for updating ones. The return value of
* the visitor is just ignored. To avoid deadlock, any explicit database operation must not
* be performed in this function.
*/
bool scan_parallel(Visitor *visitor, size_t thnum,
kc::BasicDB::ProgressChecker* checker = NULL) {
bool err = false;
int64_t ct = std::time(NULL);
TimedVisitor myvisitor(this, visitor, ct, true);
if (!db_.scan_parallel(&myvisitor, thnum, checker)) err = true;
if (xcur_) {
int64_t count = db_.count();
int64_t xtsc = XTSCUNIT / XTREADFREQ;
if (count > 0) xtsc *= count / XTITERFREQ;
if (!expire_records(xtsc)) err = true;
}
return !err;
}
/**
* Synchronize updated contents with the file and the device.
* @param hard true for physical synchronization with the device, or false for logical
* synchronization with the file system.
* @param proc a postprocessor object. If it is NULL, no postprocessing is performed.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
* @note The operation of the postprocessor is performed atomically and other threads accessing
* the same record are blocked. To avoid deadlock, any explicit database operation must not
* be performed in this function.
*/
bool synchronize(bool hard = false, kc::BasicDB::FileProcessor* proc = NULL,
kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(true);
return db_.synchronize(hard, proc, checker);
}
/**
* Occupy database by locking and do something meanwhile.
* @param writable true to use writer lock, or false to use reader lock.
* @param proc a processor object. If it is NULL, no processing is performed.
* @return true on success, or false on failure.
* @note The operation of the processor is performed atomically and other threads accessing
* the same record are blocked. To avoid deadlock, any explicit database operation must not
* be performed in this function.
*/
bool occupy(bool writable = true, kc::BasicDB::FileProcessor* proc = NULL) {
_assert_(true);
return db_.occupy(writable, proc);
}
/**
* Create a copy of the database file.
* @param dest the path of the destination file.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool copy(const std::string& dest, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(true);
return db_.copy(dest, checker);
}
/**
* Begin transaction.
* @param hard true for physical synchronization with the device, or false for logical
* synchronization with the file system.
* @return true on success, or false on failure.
*/
bool begin_transaction(bool hard = false) {
_assert_(true);
return db_.begin_transaction(hard);
}
/**
* Try to begin transaction.
* @param hard true for physical synchronization with the device, or false for logical
* synchronization with the file system.
* @return true on success, or false on failure.
*/
bool begin_transaction_try(bool hard = false) {
_assert_(true);
return db_.begin_transaction_try(hard);
}
/**
* End transaction.
* @param commit true to commit the transaction, or false to abort the transaction.
* @return true on success, or false on failure.
*/
bool end_transaction(bool commit = true) {
_assert_(true);
return db_.end_transaction(commit);
}
/**
* Remove all records.
* @return true on success, or false on failure.
*/
bool clear() {
_assert_(true);
return db_.clear();
}
/**
* Get the number of records.
* @return the number of records, or -1 on failure.
*/
int64_t count() {
_assert_(true);
return db_.count();
}
/**
* Get the size of the database file.
* @return the size of the database file in bytes, or -1 on failure.
*/
int64_t size() {
_assert_(true);
return db_.size();
}
/**
* Get the path of the database file.
* @return the path of the database file, or an empty string on failure.
*/
std::string path() {
_assert_(true);
return db_.path();
}
/**
* Get the miscellaneous status information.
* @param strmap a string map to contain the result.
* @return true on success, or false on failure.
*/
bool status(std::map<std::string, std::string>* strmap) {
_assert_(strmap);
if (!db_.status(strmap)) return false;
(*strmap)["ktopts"] = kc::strprintf("%u", opts_);
(*strmap)["ktcapcnt"] = kc::strprintf("%lld", (long long)capcnt_);
(*strmap)["ktcapsiz"] = kc::strprintf("%lld", (long long)capsiz_);
return true;
}
/**
* Set the value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return true on success, or false on failure.
* @note If no record corresponds to the key, a new record is created. If the corresponding
* record exists, the value is overwritten.
*/
bool set(const char* kbuf, size_t ksiz, const char* vbuf, size_t vsiz,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && vbuf && vsiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const char* vbuf, size_t vsiz, int64_t xt) :
vbuf_(vbuf), vsiz_(vsiz), xt_(xt) {}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
*sp = vsiz_;
*xtp = xt_;
return vbuf_;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
*sp = vsiz_;
*xtp = xt_;
return vbuf_;
}
const char* vbuf_;
size_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor(vbuf, vsiz, xt);
if (!accept(kbuf, ksiz, &visitor, true)) return false;
return true;
}
/**
* Set the value of a record.
* @note Equal to the original DB::set method except that the parameters are std::string.
*/
bool set(const std::string& key, const std::string& value, int64_t xt = kc::INT64MAX) {
_assert_(true);
return set(key.c_str(), key.size(), value.c_str(), value.size(), xt);
}
/**
* Add a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return true on success, or false on failure.
* @note If no record corresponds to the key, a new record is created. If the corresponding
* record exists, the record is not modified and false is returned.
*/
bool add(const char* kbuf, size_t ksiz, const char* vbuf, size_t vsiz,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && vbuf && vsiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const char* vbuf, size_t vsiz, int64_t xt) :
vbuf_(vbuf), vsiz_(vsiz), xt_(xt), ok_(false) {}
bool ok() const {
return ok_;
}
private:
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
ok_ = true;
*sp = vsiz_;
*xtp = xt_;
return vbuf_;
}
const char* vbuf_;
size_t vsiz_;
int64_t xt_;
bool ok_;
};
VisitorImpl visitor(vbuf, vsiz, xt);
if (!accept(kbuf, ksiz, &visitor, true)) return false;
if (!visitor.ok()) {
set_error(kc::BasicDB::Error::DUPREC, "record duplication");
return false;
}
return true;
}
/**
* Set the value of a record.
* @note Equal to the original DB::add method except that the parameters are std::string.
*/
bool add(const std::string& key, const std::string& value, int64_t xt = kc::INT64MAX) {
_assert_(true);
return add(key.c_str(), key.size(), value.c_str(), value.size(), xt);
}
/**
* Replace the value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return true on success, or false on failure.
* @note If no record corresponds to the key, no new record is created and false is returned.
* If the corresponding record exists, the value is modified.
*/
bool replace(const char* kbuf, size_t ksiz, const char* vbuf, size_t vsiz,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && vbuf && vsiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const char* vbuf, size_t vsiz, int64_t xt) :
vbuf_(vbuf), vsiz_(vsiz), xt_(xt), ok_(false) {}
bool ok() const {
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
ok_ = true;
*sp = vsiz_;
*xtp = xt_;
return vbuf_;
}
const char* vbuf_;
size_t vsiz_;
int64_t xt_;
bool ok_;
};
VisitorImpl visitor(vbuf, vsiz, xt);
if (!accept(kbuf, ksiz, &visitor, true)) return false;
if (!visitor.ok()) {
set_error(kc::BasicDB::Error::NOREC, "no record");
return false;
}
return true;
}
/**
* Replace the value of a record.
* @note Equal to the original DB::replace method except that the parameters are std::string.
*/
bool replace(const std::string& key, const std::string& value, int64_t xt = kc::INT64MAX) {
_assert_(true);
return replace(key.c_str(), key.size(), value.c_str(), value.size(), xt);
}
/**
* Append the value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return true on success, or false on failure.
* @note If no record corresponds to the key, a new record is created. If the corresponding
* record exists, the given value is appended at the end of the existing value.
*/
bool append(const char* kbuf, size_t ksiz, const char* vbuf, size_t vsiz,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && vbuf && vsiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const char* vbuf, size_t vsiz, int64_t xt) :
vbuf_(vbuf), vsiz_(vsiz), xt_(xt), nbuf_(NULL) {}
~VisitorImpl() {
if (nbuf_) delete[] nbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
size_t nsiz = vsiz + vsiz_;
nbuf_ = new char[nsiz];
std::memcpy(nbuf_, vbuf, vsiz);
std::memcpy(nbuf_ + vsiz, vbuf_, vsiz_);
*sp = nsiz;
*xtp = xt_;
return nbuf_;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
*sp = vsiz_;
*xtp = xt_;
return vbuf_;
}
const char* vbuf_;
size_t vsiz_;
int64_t xt_;
char* nbuf_;
};
VisitorImpl visitor(vbuf, vsiz, xt);
if (!accept(kbuf, ksiz, &visitor, true)) return false;
return true;
}
/**
* Set the value of a record.
* @note Equal to the original DB::append method except that the parameters are std::string.
*/
bool append(const std::string& key, const std::string& value, int64_t xt = kc::INT64MAX) {
_assert_(true);
return append(key.c_str(), key.size(), value.c_str(), value.size(), xt);
}
/**
* Add a number to the numeric integer value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param num the additional number.
* @param orig the origin number if no record corresponds to the key. If it is INT64MIN and
* no record corresponds, this function fails. If it is INT64MAX, the value is set as the
* additional number regardless of the current value.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return the result value, or kyotocabinet::INT64MIN on failure.
* @note The value is serialized as an 8-byte binary integer in big-endian order, not a decimal
* string. If existing value is not 8-byte, this function fails.
*/
int64_t increment(const char* kbuf, size_t ksiz, int64_t num, int64_t orig = 0,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(int64_t num, int64_t orig, int64_t xt) :
num_(num), orig_(orig), xt_(xt), big_(0) {}
int64_t num() {
return num_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
if (vsiz != sizeof(num_)) {
num_ = kc::INT64MIN;
return NOP;
}
int64_t onum;
if (orig_ == kc::INT64MAX) {
onum = 0;
} else {
std::memcpy(&onum, vbuf, vsiz);
onum = kc::ntoh64(onum);
if (num_ == 0) {
num_ = onum;
return NOP;
}
}
num_ += onum;
big_ = kc::hton64(num_);
*sp = sizeof(big_);
*xtp = xt_;
return (const char*)&big_;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
if (orig_ == kc::INT64MIN) {
num_ = kc::INT64MIN;
return NOP;
}
if (orig_ != kc::INT64MAX) num_ += orig_;
big_ = kc::hton64(num_);
*sp = sizeof(big_);
*xtp = xt_;
return (const char*)&big_;
}
int64_t num_;
int64_t orig_;
int64_t xt_;
uint64_t big_;
};
VisitorImpl visitor(num, orig, xt);
if (!accept(kbuf, ksiz, &visitor, num != 0 || orig != kc::INT64MIN)) return kc::INT64MIN;
num = visitor.num();
if (num == kc::INT64MIN) {
set_error(kc::BasicDB::Error::LOGIC, "logical inconsistency");
return num;
}
return num;
}
/**
* Add a number to the numeric integer value of a record.
* @note Equal to the original DB::increment method except that the parameter is std::string.
*/
int64_t increment(const std::string& key, int64_t num, int64_t orig = 0,
int64_t xt = kc::INT64MAX) {
_assert_(true);
return increment(key.c_str(), key.size(), num, orig, xt);
}
/**
* Add a number to the numeric double value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param num the additional number.
* @param orig the origin number if no record corresponds to the key. If it is negative
* infinity and no record corresponds, this function fails. If it is positive infinity, the
* value is set as the additional number regardless of the current value.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return the result value, or Not-a-number on failure.
* @note The value is serialized as an 16-byte binary fixed-point number in big-endian order,
* not a decimal string. If existing value is not 16-byte, this function fails.
*/
double increment_double(const char* kbuf, size_t ksiz, double num, double orig = 0,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(double num, double orig, int64_t xt) :
DECUNIT(1000000000000000LL), num_(num), orig_(orig), xt_(xt), buf_() {}
double num() {
return num_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
if (vsiz != sizeof(buf_)) {
num_ = kc::nan();
return NOP;
}
int64_t linteg, lfract;
if (kc::chkinf(orig_) && orig_ >= 0) {
linteg = 0;
lfract = 0;
} else {
std::memcpy(&linteg, vbuf, sizeof(linteg));
linteg = kc::ntoh64(linteg);
std::memcpy(&lfract, vbuf + sizeof(linteg), sizeof(lfract));
lfract = kc::ntoh64(lfract);
}
if (lfract == kc::INT64MIN && linteg == kc::INT64MIN) {
num_ = kc::nan();
return NOP;
} else if (linteg == kc::INT64MAX) {
num_ = HUGE_VAL;
return NOP;
} else if (linteg == kc::INT64MIN) {
num_ = -HUGE_VAL;
return NOP;
}
if (num_ == 0.0 && !(kc::chkinf(orig_) && orig_ >= 0)) {
num_ = linteg + (double)lfract / DECUNIT;
return NOP;
}
long double dinteg;
long double dfract = std::modfl(num_, &dinteg);
if (kc::chknan(dinteg)) {
linteg = kc::INT64MIN;
lfract = kc::INT64MIN;
num_ = kc::nan();
} else if (kc::chkinf(dinteg)) {
linteg = dinteg > 0 ? kc::INT64MAX : kc::INT64MIN;
lfract = 0;
num_ = dinteg;
} else {
linteg += (int64_t)dinteg;
lfract += (int64_t)(dfract * DECUNIT);
if (lfract >= DECUNIT) {
linteg += 1;
lfract -= DECUNIT;
}
num_ = linteg + (double)lfract / DECUNIT;
}
linteg = kc::hton64(linteg);
std::memcpy(buf_, &linteg, sizeof(linteg));
lfract = kc::hton64(lfract);
std::memcpy(buf_ + sizeof(linteg), &lfract, sizeof(lfract));
*sp = sizeof(buf_);
*xtp = xt_;
return buf_;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
if (kc::chknan(orig_) || (kc::chkinf(orig_) && orig_ < 0)) {
num_ = kc::nan();
return NOP;
}
if (!kc::chkinf(orig_)) num_ += orig_;
long double dinteg;
long double dfract = std::modfl(num_, &dinteg);
int64_t linteg, lfract;
if (kc::chknan(dinteg)) {
linteg = kc::INT64MIN;
lfract = kc::INT64MIN;
} else if (kc::chkinf(dinteg)) {
linteg = dinteg > 0 ? kc::INT64MAX : kc::INT64MIN;
lfract = 0;
} else {
linteg = (int64_t)dinteg;
lfract = (int64_t)(dfract * DECUNIT);
}
linteg = kc::hton64(linteg);
std::memcpy(buf_, &linteg, sizeof(linteg));
lfract = kc::hton64(lfract);
std::memcpy(buf_ + sizeof(linteg), &lfract, sizeof(lfract));
*sp = sizeof(buf_);
*xtp = xt_;
return buf_;
}
const int64_t DECUNIT;
double num_;
double orig_;
int64_t xt_;
char buf_[sizeof(int64_t)*2];
};
VisitorImpl visitor(num, orig, xt);
if (!accept(kbuf, ksiz, &visitor, true)) return kc::nan();
num = visitor.num();
if (kc::chknan(num)) {
set_error(kc::BasicDB::Error::LOGIC, "logical inconsistency");
return kc::nan();
}
return num;
}
/**
* Add a number to the numeric double value of a record.
* @note Equal to the original DB::increment_double method except that the parameter is
* std::string.
*/
double increment_double(const std::string& key, double num, double orig = 0,
int64_t xt = kc::INT64MAX) {
_assert_(true);
return increment_double(key.c_str(), key.size(), num, orig, xt);
}
/**
* Perform compare-and-swap.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param ovbuf the pointer to the old value region. NULL means that no record corresponds.
* @param ovsiz the size of the old value region.
* @param nvbuf the pointer to the new value region. NULL means that the record is removed.
* @param nvsiz the size of new old value region.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @return true on success, or false on failure.
*/
bool cas(const char* kbuf, size_t ksiz,
const char* ovbuf, size_t ovsiz, const char* nvbuf, size_t nvsiz,
int64_t xt = kc::INT64MAX) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const char* ovbuf, size_t ovsiz, const char* nvbuf, size_t nvsiz,
int64_t xt) :
ovbuf_(ovbuf), ovsiz_(ovsiz), nvbuf_(nvbuf), nvsiz_(nvsiz), xt_(xt), ok_(false) {}
bool ok() const {
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
if (!ovbuf_ || vsiz != ovsiz_ || std::memcmp(vbuf, ovbuf_, vsiz)) return NOP;
ok_ = true;
if (!nvbuf_) return REMOVE;
*sp = nvsiz_;
*xtp = xt_;
return nvbuf_;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
if (ovbuf_) return NOP;
ok_ = true;
if (!nvbuf_) return NOP;
*sp = nvsiz_;
*xtp = xt_;
return nvbuf_;
}
const char* ovbuf_;
size_t ovsiz_;
const char* nvbuf_;
size_t nvsiz_;
int64_t xt_;
bool ok_;
};
VisitorImpl visitor(ovbuf, ovsiz, nvbuf, nvsiz, xt);
if (!accept(kbuf, ksiz, &visitor, true)) return false;
if (!visitor.ok()) {
set_error(kc::BasicDB::Error::LOGIC, "status conflict");
return false;
}
return true;
}
/**
* Perform compare-and-swap.
* @note Equal to the original DB::cas method except that the parameters are std::string.
*/
bool cas(const std::string& key,
const std::string& ovalue, const std::string& nvalue, int64_t xt = kc::INT64MAX) {
_assert_(true);
return cas(key.c_str(), key.size(),
ovalue.c_str(), ovalue.size(), nvalue.c_str(), nvalue.size(), xt);
}
/**
* Remove a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @return true on success, or false on failure.
* @note If no record corresponds to the key, false is returned.
*/
bool remove(const char* kbuf, size_t ksiz) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : ok_(false) {}
bool ok() const {
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
ok_ = true;
return REMOVE;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
return REMOVE;
}
bool ok_;
};
VisitorImpl visitor;
if (!accept(kbuf, ksiz, &visitor, true)) return false;
if (!visitor.ok()) {
set_error(kc::BasicDB::Error::NOREC, "no record");
return false;
}
return true;
}
/**
* Remove a record.
* @note Equal to the original DB::remove method except that the parameter is std::string.
*/
bool remove(const std::string& key) {
_assert_(true);
return remove(key.c_str(), key.size());
}
/**
* Retrieve the value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param xtp the pointer to the variable into which the absolute expiration time is assigned.
* If it is NULL, it is ignored.
* @return the pointer to the value region of the corresponding record, or NULL on failure.
* @note If no record corresponds to the key, NULL is returned. Because an additional zero
* code is appended at the end of the region of the return value, the return value can be
* treated as a C-style string. Because the region of the return value is allocated with the
* the new[] operator, it should be released with the delete[] operator when it is no longer
* in use.
*/
char* get(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp = NULL) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && sp);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : vbuf_(NULL), vsiz_(0), xt_(0) {}
char* pop(size_t* sp, int64_t* xtp) {
*sp = vsiz_;
if (xtp) *xtp = xt_;
return vbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
vbuf_ = new char[vsiz+1];
std::memcpy(vbuf_, vbuf, vsiz);
vbuf_[vsiz] = '\0';
vsiz_ = vsiz;
xt_ = *xtp;
return NOP;
}
char* vbuf_;
size_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor;
if (!accept(kbuf, ksiz, &visitor, false)) {
*sp = 0;
if (xtp) *xtp = 0;
return NULL;
}
size_t vsiz;
char* vbuf = visitor.pop(&vsiz, xtp);
if (!vbuf) {
set_error(kc::BasicDB::Error::NOREC, "no record");
*sp = 0;
if (xtp) *xtp = 0;
return NULL;
}
*sp = vsiz;
return vbuf;
}
/**
* Retrieve the value of a record.
* @note Equal to the original DB::get method except that the first parameters is the key
* string and the second parameter is a string to contain the result and the return value is
* bool for success.
*/
bool get(const std::string& key, std::string* value, int64_t* xtp = NULL) {
_assert_(value);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(std::string* value) : value_(value), ok_(false), xt_(0) {}
bool ok(int64_t* xtp) {
if (xtp) *xtp = xt_;
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
value_->clear();
value_->append(vbuf, vsiz);
ok_ = true;
xt_ = *xtp;
return NOP;
}
std::string* value_;
bool ok_;
int64_t xt_;
};
VisitorImpl visitor(value);
if (!accept(key.data(), key.size(), &visitor, false)) {
if (xtp) *xtp = 0;
return false;
}
if (!visitor.ok(xtp)) {
set_error(kc::BasicDB::Error::NOREC, "no record");
return false;
}
return true;
}
/**
* Retrieve the value of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the buffer into which the value of the corresponding record is
* written.
* @param max the size of the buffer.
* @param xtp the pointer to the variable into which the expiration time from now in seconds
* is assigned. If it is NULL, it is ignored.
* @return the size of the value, or -1 on failure.
*/
int32_t get(const char* kbuf, size_t ksiz, char* vbuf, size_t max, int64_t* xtp = NULL) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && vbuf);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(char* vbuf, size_t max) :
vbuf_(vbuf), max_(max), vsiz_(-1), xt_(0) {}
int32_t vsiz(int64_t* xtp) {
if (xtp) *xtp = xt_;
return vsiz_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
vsiz_ = vsiz;
xt_ = *xtp;
size_t max = vsiz < max_ ? vsiz : max_;
std::memcpy(vbuf_, vbuf, max);
return NOP;
}
char* vbuf_;
size_t max_;
int32_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor(vbuf, max);
if (!accept(kbuf, ksiz, &visitor, false)) return -1;
int32_t vsiz = visitor.vsiz(xtp);
if (vsiz < 0) {
set_error(kc::BasicDB::Error::NOREC, "no record");
return -1;
}
return vsiz;
}
/**
* Check the existence of a record.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param xtp the pointer to the variable into which the absolute expiration time is assigned.
* If it is NULL, it is ignored.
* @return the size of the value, or -1 on failure.
*/
int32_t check(const char* kbuf, size_t ksiz, int64_t* xtp = NULL) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : vsiz_(-1), xt_(0) {}
int32_t vsiz(int64_t* xtp) {
if (xtp) *xtp = xt_;
return vsiz_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
vsiz_ = vsiz;
xt_ = *xtp;
return NOP;
}
char* vbuf_;
int32_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor;
if (!accept(kbuf, ksiz, &visitor, false)) {
if (xtp) *xtp = 0;
return -1;
}
int32_t vsiz = visitor.vsiz(xtp);
if (vsiz < 0) {
set_error(kc::BasicDB::Error::NOREC, "no record");
if (xtp) *xtp = 0;
return -1;
}
return vsiz;
}
/**
* Check the existence of a record.
* @note Equal to the original DB::check method except that the first parameters is the key
* string.
*/
int32_t check(const std::string& key, int64_t* xtp = NULL) {
return check(key.data(), key.size(), xtp);
}
/**
* Retrieve the value of a record and remove it atomically.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param xtp the pointer to the variable into which the absolute expiration time is assigned.
* If it is NULL, it is ignored.
* @return the pointer to the value region of the corresponding record, or NULL on failure.
* @note If no record corresponds to the key, NULL is returned. Because an additional zero
* code is appended at the end of the region of the return value, the return value can be
* treated as a C-style string. Because the region of the return value is allocated with the
* the new[] operator, it should be released with the delete[] operator when it is no longer
* in use.
*/
char* seize(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp = NULL) {
_assert_(kbuf && ksiz <= kc::MEMMAXSIZ && sp);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : vbuf_(NULL), vsiz_(0), xt_(0) {}
char* pop(size_t* sp, int64_t* xtp) {
*sp = vsiz_;
if (xtp) *xtp = xt_;
return vbuf_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
vbuf_ = new char[vsiz+1];
std::memcpy(vbuf_, vbuf, vsiz);
vbuf_[vsiz] = '\0';
vsiz_ = vsiz;
xt_ = *xtp;
return REMOVE;
}
char* vbuf_;
size_t vsiz_;
int64_t xt_;
};
VisitorImpl visitor;
if (!accept(kbuf, ksiz, &visitor, true)) {
*sp = 0;
if (xtp) *xtp = 0;
return NULL;
}
size_t vsiz;
char* vbuf = visitor.pop(&vsiz, xtp);
if (!vbuf) {
set_error(kc::BasicDB::Error::NOREC, "no record");
*sp = 0;
if (xtp) *xtp = 0;
return NULL;
}
*sp = vsiz;
return vbuf;
}
/**
* Retrieve the value of a record and remove it atomically.
* @note Equal to the original DB::get method except that the first parameters is the key
* string and the second parameter is a string to contain the result and the return value is
* bool for success.
*/
bool seize(const std::string& key, std::string* value, int64_t* xtp = NULL) {
_assert_(value);
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(std::string* value) : value_(value), ok_(false), xt_(0) {}
bool ok(int64_t* xtp) {
if (xtp) *xtp = xt_;
return ok_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
value_->clear();
value_->append(vbuf, vsiz);
ok_ = true;
xt_ = *xtp;
return REMOVE;
}
std::string* value_;
bool ok_;
int64_t xt_;
};
VisitorImpl visitor(value);
if (!accept(key.data(), key.size(), &visitor, true)) {
if (xtp) *xtp = 0;
return false;
}
if (!visitor.ok(xtp)) {
set_error(kc::BasicDB::Error::NOREC, "no record");
return false;
}
return true;
}
/**
* Store records at once.
* @param recs the records to store.
* @param xt the expiration time from now in seconds. If it is negative, the absolute value
* is treated as the epoch time.
* @param atomic true to perform all operations atomically, or false for non-atomic operations.
* @return the number of stored records, or -1 on failure.
*/
int64_t set_bulk(const std::map<std::string, std::string>& recs,
int64_t xt = kc::INT64MAX, bool atomic = true) {
_assert_(true);
if (atomic) {
std::vector<std::string> keys;
keys.reserve(recs.size());
std::map<std::string, std::string>::const_iterator rit = recs.begin();
std::map<std::string, std::string>::const_iterator ritend = recs.end();
while (rit != ritend) {
keys.push_back(rit->first);
++rit;
}
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(const std::map<std::string, std::string>& recs, int64_t xt) :
recs_(recs), xt_(xt) {}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
std::map<std::string, std::string>::const_iterator rit =
recs_.find(std::string(kbuf, ksiz));
if (rit == recs_.end()) return NOP;
*sp = rit->second.size();
*xtp = xt_;
return rit->second.data();
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
std::map<std::string, std::string>::const_iterator rit =
recs_.find(std::string(kbuf, ksiz));
if (rit == recs_.end()) return NOP;
*sp = rit->second.size();
*xtp = xt_;
return rit->second.data();
}
const std::map<std::string, std::string>& recs_;
int64_t xt_;
};
VisitorImpl visitor(recs, xt);
if (!accept_bulk(keys, &visitor, true)) return -1;
return keys.size();
}
std::map<std::string, std::string>::const_iterator rit = recs.begin();
std::map<std::string, std::string>::const_iterator ritend = recs.end();
while (rit != ritend) {
if (!set(rit->first.data(), rit->first.size(), rit->second.data(), rit->second.size(), xt))
return -1;
++rit;
}
return recs.size();
}
/**
* Remove records at once.
* @param keys the keys of the records to remove.
* @param atomic true to perform all operations atomically, or false for non-atomic operations.
* @return the number of removed records, or -1 on failure.
*/
int64_t remove_bulk(const std::vector<std::string>& keys, bool atomic = true) {
_assert_(true);
if (atomic) {
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl() : cnt_(0) {}
int64_t cnt() const {
return cnt_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
cnt_++;
return REMOVE;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp, int64_t* xtp) {
return REMOVE;
}
int64_t cnt_;
};
VisitorImpl visitor;
if (!accept_bulk(keys, &visitor, true)) return -1;
return visitor.cnt();
}
int64_t cnt = 0;
std::vector<std::string>::const_iterator kit = keys.begin();
std::vector<std::string>::const_iterator kitend = keys.end();
while (kit != kitend) {
if (remove(kit->data(), kit->size())) {
cnt++;
} else if (error() != kc::BasicDB::Error::NOREC) {
return -1;
}
++kit;
}
return cnt;
}
/**
* Retrieve records at once.
* @param keys the keys of the records to retrieve.
* @param recs a string map to contain the retrieved records.
* @param atomic true to perform all operations atomically, or false for non-atomic operations.
* @return the number of retrieved records, or -1 on failure.
*/
int64_t get_bulk(const std::vector<std::string>& keys,
std::map<std::string, std::string>* recs, bool atomic = true) {
_assert_(recs);
if (atomic) {
class VisitorImpl : public Visitor {
public:
explicit VisitorImpl(std::map<std::string, std::string>* recs) : recs_(recs) {}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp, int64_t* xtp) {
(*recs_)[std::string(kbuf, ksiz)] = std::string(vbuf, vsiz);
return NOP;
}
std::map<std::string, std::string>* recs_;
};
VisitorImpl visitor(recs);
if (!accept_bulk(keys, &visitor, false)) return -1;
return recs->size();
}
std::vector<std::string>::const_iterator kit = keys.begin();
std::vector<std::string>::const_iterator kitend = keys.end();
while (kit != kitend) {
size_t vsiz;
const char* vbuf = get(kit->data(), kit->size(), &vsiz);
if (vbuf) {
(*recs)[*kit] = std::string(vbuf, vsiz);
delete[] vbuf;
} else if (error() != kc::BasicDB::Error::NOREC) {
return -1;
}
++kit;
}
return recs->size();
}
/**
* Dump records into a data stream.
* @param dest the destination stream.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool dump_snapshot(std::ostream* dest, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(dest);
return db_.dump_snapshot(dest, checker);
}
/**
* Dump records into a file.
* @param dest the path of the destination file.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool dump_snapshot(const std::string& dest, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(true);
return db_.dump_snapshot(dest, checker);
}
/**
* Load records from a data stream.
* @param src the source stream.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool load_snapshot(std::istream* src, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(src);
return db_.load_snapshot(src, checker);
}
/**
* Load records from a file.
* @param src the path of the source file.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool load_snapshot(const std::string& src, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(true);
return db_.load_snapshot(src, checker);
}
/**
* Dump records atomically into a file.
* @param dest the path of the destination file.
* @param zcomp the data compressor object. If it is NULL, no compression is performed.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool dump_snapshot_atomic(const std::string& dest, kc::Compressor* zcomp = NULL,
kc::BasicDB::ProgressChecker* checker = NULL);
/**
* Load records atomically from a file.
* @param src the path of the source file.
* @param zcomp the data compressor object. If it is NULL, no decompression is performed.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool load_snapshot_atomic(const std::string& src, kc::Compressor* zcomp = NULL,
kc::BasicDB::ProgressChecker* checker = NULL);
/**
* Reveal the inner database object.
* @return the inner database object, or NULL on failure.
*/
kc::BasicDB* reveal_inner_db() {
_assert_(true);
return db_.reveal_inner_db();
}
/**
* Scan the database and eliminate regions of expired records.
* @param step the number of steps. If it is not more than 0, the whole region is scanned.
* @return true on success, or false on failure.
*/
bool vacuum(int64_t step = 0) {
_assert_(true);
bool err = false;
if (xcur_) {
if (step > 1) {
if (step > kc::INT64MAX / XTSCUNIT) step = kc::INT64MAX / XTSCUNIT;
if (!expire_records(step * XTSCUNIT)) err = true;
} else {
xcur_->jump();
xsc_ = 0;
if (!expire_records(kc::INT64MAX)) err = true;
xsc_ = 0;
}
}
if (!defrag(step)) err = true;
return !err;
}
/**
* Recover the database with an update log message.
* @param mbuf the pointer to the message region.
* @param msiz the size of the message region.
* @return true on success, or false on failure.
*/
bool recover(const char* mbuf, size_t msiz) {
_assert_(mbuf && msiz <= kc::MEMMAXSIZ);
bool err = false;
if (msiz < 1) {
set_error(kc::BasicDB::Error::INVALID, "invalid message format");
return false;
}
const char* rp = mbuf;
uint8_t op = *(uint8_t*)(rp++);
msiz--;
switch (op) {
case USET: {
if (msiz < 2) {
set_error(kc::BasicDB::Error::INVALID, "invalid message format");
return false;
}
uint64_t ksiz;
size_t step = kc::readvarnum(rp, msiz, &ksiz);
rp += step;
msiz -= step;
uint64_t vsiz;
step = kc::readvarnum(rp, msiz, &vsiz);
rp += step;
msiz -= step;
const char* kbuf = rp;
const char* vbuf = rp + ksiz;
if (msiz != ksiz + vsiz) {
set_error(kc::BasicDB::Error::INVALID, "invalid message format");
return false;
}
if (!db_.set(kbuf, ksiz, vbuf, vsiz)) err = true;
if (utrigger_) log_update(utrigger_, kbuf, ksiz, vbuf, vsiz);
break;
}
case UREMOVE: {
if (msiz < 1) {
set_error(kc::BasicDB::Error::INVALID, "invalid message format");
return false;
}
uint64_t ksiz;
size_t step = kc::readvarnum(rp, msiz, &ksiz);
rp += step;
msiz -= step;
const char* kbuf = rp;
if (msiz != ksiz) {
set_error(kc::BasicDB::Error::INVALID, "invalid message format");
return false;
}
if (!db_.remove(kbuf, ksiz) && db_.error() != kc::BasicDB::Error::NOREC) err = true;
if (utrigger_) log_update(utrigger_, kbuf, ksiz, TimedVisitor::REMOVE, 0);
break;
}
case UCLEAR: {
if (msiz != 0) {
set_error(kc::BasicDB::Error::INVALID, "invalid message format");
return false;
}
if (!db_.clear()) err = true;
break;
}
default: {
break;
}
}
if (xcur_ && !expire_records(XTSCUNIT)) err = true;
return !err;
}
/**
* Get keys matching a prefix string.
* @param prefix the prefix string.
* @param strvec a string vector to contain the result.
* @param max the maximum number to retrieve. If it is negative, no limit is specified.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return the number of retrieved keys or -1 on failure.
*/
int64_t match_prefix(const std::string& prefix, std::vector<std::string>* strvec,
int64_t max = -1, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(strvec);
return db_.match_prefix(prefix, strvec, max, checker);
}
/**
* Get keys matching a regular expression string.
* @param regex the regular expression string.
* @param strvec a string vector to contain the result.
* @param max the maximum number to retrieve. If it is negative, no limit is specified.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return the number of retrieved keys or -1 on failure.
*/
int64_t match_regex(const std::string& regex, std::vector<std::string>* strvec,
int64_t max = -1, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(strvec);
return db_.match_regex(regex, strvec, max, checker);
}
/**
* Get keys similar to a string in terms of the levenshtein distance.
* @param origin the origin string.
* @param range the maximum distance of keys to adopt.
* @param utf flag to treat keys as UTF-8 strings.
* @param strvec a string vector to contain the result.
* @param max the maximum number to retrieve. If it is negative, no limit is specified.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return the number of retrieved keys or -1 on failure.
*/
int64_t match_similar(const std::string& origin, size_t range, bool utf,
std::vector<std::string>* strvec,
int64_t max = -1, kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(strvec);
return db_.match_similar(origin, range, utf, strvec, max, checker);
}
/**
* Merge records from other databases.
* @param srcary an array of the source detabase objects.
* @param srcnum the number of the elements of the source array.
* @param mode the merge mode. TimedDB::MSET to overwrite the existing value, TimedDB::MADD to
* keep the existing value, TimedDB::MREPLACE to modify the existing record only,
* TimedDB::MAPPEND to append the new value.
* @param checker a progress checker object. If it is NULL, no checking is performed.
* @return true on success, or false on failure.
*/
bool merge(TimedDB** srcary, size_t srcnum, MergeMode mode = MSET,
kc::BasicDB::ProgressChecker* checker = NULL) {
_assert_(srcary && srcnum <= kc::MEMMAXSIZ);
bool err = false;
kc::Comparator* comp = kc::LEXICALCOMP;
std::priority_queue<MergeLine> lines;
int64_t allcnt = 0;
for (size_t i = 0; i < srcnum; i++) {
MergeLine line;
line.cur = srcary[i]->cursor();
line.comp = comp;
line.cur->jump();
line.kbuf = line.cur->get(&line.ksiz, &line.vbuf, &line.vsiz, &line.xt, true);
if (line.kbuf) {
lines.push(line);
int64_t count = srcary[i]->count();
if (count > 0) allcnt += count;
} else {
delete line.cur;
}
}
if (checker && !checker->check("merge", "beginning", 0, allcnt)) {
set_error(kc::BasicDB::Error::LOGIC, "checker failed");
err = true;
}
int64_t curcnt = 0;
while (!err && !lines.empty()) {
MergeLine line = lines.top();
lines.pop();
switch (mode) {
case MSET: {
if (!set(line.kbuf, line.ksiz, line.vbuf, line.vsiz, -line.xt)) err = true;
break;
}
case MADD: {
if (!add(line.kbuf, line.ksiz, line.vbuf, line.vsiz, -line.xt) &&
error() != kc::BasicDB::Error::DUPREC) err = true;
break;
}
case MREPLACE: {
if (!replace(line.kbuf, line.ksiz, line.vbuf, line.vsiz, -line.xt) &&
error() != kc::BasicDB::Error::NOREC) err = true;
break;
}
case MAPPEND: {
if (!append(line.kbuf, line.ksiz, line.vbuf, line.vsiz, -line.xt)) err = true;
break;
}
}
delete[] line.kbuf;
line.kbuf = line.cur->get(&line.ksiz, &line.vbuf, &line.vsiz, &line.xt, true);
if (line.kbuf) {
lines.push(line);
} else {
delete line.cur;
}
curcnt++;
if (checker && !checker->check("merge", "processing", curcnt, allcnt)) {
set_error(kc::BasicDB::Error::LOGIC, "checker failed");
err = true;
break;
}
}
if (checker && !checker->check("merge", "ending", -1, allcnt)) {
set_error(kc::BasicDB::Error::LOGIC, "checker failed");
err = true;
}
while (!lines.empty()) {
MergeLine line = lines.top();
lines.pop();
delete[] line.kbuf;
delete line.cur;
}
return !err;
}
/**
* Create a cursor object.
* @return the return value is the created cursor object.
* @note Because the object of the return value is allocated by the constructor, it should be
* released with the delete operator when it is no longer in use.
*/
Cursor* cursor() {
_assert_(true);
return new Cursor(this);
}
/**
* Set the internal logger.
* @param logger the logger object. The same as with kc::BasicDB.
* @param kinds kinds of logged messages by bitwise-or: The same as with kc::BasicDB.
* @return true on success, or false on failure.
*/
bool tune_logger(kc::BasicDB::Logger* logger,
uint32_t kinds = kc::BasicDB::Logger::WARN | kc::BasicDB::Logger::ERROR) {
_assert_(logger);
return db_.tune_logger(logger, kinds);
}
/**
* Set the internal update trigger.
* @param trigger the trigger object.
* @return true on success, or false on failure.
*/
bool tune_update_trigger(UpdateTrigger* trigger) {
_assert_(trigger);
utrigger_ = trigger;
return true;
}
/**
* Tokenize an update log message.
* @param mbuf the pointer to the message region.
* @param msiz the size of the message region.
* @param tokens a string vector to contain the result.
* @return true on success, or false on failure.
*/
static bool tokenize_update_log(const char* mbuf, size_t msiz,
std::vector<std::string>* tokens) {
_assert_(mbuf && msiz <= kc::MEMMAXSIZ && tokens);
tokens->clear();
if (msiz < 1) return false;
const char* rp = mbuf;
uint8_t op = *(uint8_t*)(rp++);
msiz--;
switch (op) {
case USET: {
if (msiz < 2) return false;
uint64_t ksiz;
size_t step = kc::readvarnum(rp, msiz, &ksiz);
rp += step;
msiz -= step;
uint64_t vsiz;
step = kc::readvarnum(rp, msiz, &vsiz);
rp += step;
msiz -= step;
const char* kbuf = rp;
const char* vbuf = rp + ksiz;
if (msiz != ksiz + vsiz) return false;
tokens->push_back("set");
tokens->push_back(std::string(kbuf, ksiz));
tokens->push_back(std::string(vbuf, vsiz));
break;
}
case UREMOVE: {
if (msiz < 1) return false;
uint64_t ksiz;
size_t step = kc::readvarnum(rp, msiz, &ksiz);
rp += step;
msiz -= step;
const char* kbuf = rp;
if (msiz != ksiz) return false;
tokens->push_back("remove");
tokens->push_back(std::string(kbuf, ksiz));
break;
}
case UCLEAR: {
if (msiz != 0) return false;
tokens->push_back("clear");
break;
}
default: {
tokens->push_back("unknown");
tokens->push_back(std::string(mbuf, msiz));
break;
}
}
return true;
}
/**
* Get status of an atomic snapshot file.
* @param src the path of the source file.
* @param tsp the pointer to the variable into which the time stamp of the snapshot data is
* assigned. If it is NULL, it is ignored.
* @param cntp the pointer to the variable into which the number of records in the original
* database is assigned. If it is NULL, it is ignored.
* @param sizp the pointer to the variable into which the size of the original database is
* assigned. If it is NULL, it is ignored.
* @return true on success, or false on failure.
*/
static bool status_snapshot_atomic(const std::string& src, uint64_t* tsp = NULL,
int64_t* cntp = NULL, int64_t* sizp = NULL);
private:
/**
* Tuning Options.
*/
enum Option {
TPERSIST = 1 << 1 ///< disable expiration
};
/**
* Update Operations.
*/
enum UpdateOperation {
UNOP = 0xa0, ///< no operation
USET, ///< setting the value
UREMOVE, ///< removing the record
UOPEN, ///< opening
UCLOSE, ///< closing
UCLEAR, ///< clearing
UITERATE, ///< iteration
USYNCHRONIZE, ///< synchronization
UBEGINTRAN, ///< beginning transaction
UCOMMITTRAN, ///< committing transaction
UABORTTRAN, ///< aborting transaction
UUNKNOWN ///< unknown operation
};
/**
* Visitor to handle records with time stamps.
*/
class TimedVisitor : public kc::BasicDB::Visitor {
public:
TimedVisitor(TimedDB* db, TimedDB::Visitor* visitor, int64_t ct, bool isiter) :
db_(db), visitor_(visitor), ct_(ct), isiter_(isiter), jbuf_(NULL), again_(false) {
_assert_(db && visitor && ct >= 0);
}
~TimedVisitor() {
_assert_(true);
delete[] jbuf_;
}
bool again() {
_assert_(true);
return again_;
}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp) {
_assert_(kbuf && vbuf && sp);
if (db_->opts_ & TimedDB::TPERSIST) {
size_t rsiz;
int64_t xt = kc::INT64MAX;
const char* rbuf = visitor_->visit_full(kbuf, ksiz, vbuf, vsiz, &rsiz, &xt);
*sp = rsiz;
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, rbuf, rsiz);
return rbuf;
}
if (vsiz < (size_t)XTWIDTH) return NOP;
int64_t xt = kc::readfixnum(vbuf, XTWIDTH);
if (ct_ > xt) {
if (isiter_) {
again_ = true;
return NOP;
}
db_->set_error(kc::BasicDB::Error::NOREC, "no record (expired)");
size_t rsiz;
const char* rbuf = visitor_->visit_empty(kbuf, ksiz, &rsiz, &xt);
if (rbuf == TimedDB::Visitor::NOP) return NOP;
if (rbuf == TimedDB::Visitor::REMOVE) {
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, REMOVE, 0);
return REMOVE;
}
delete[] jbuf_;
xt = modify_exptime(xt, ct_);
size_t jsiz;
jbuf_ = make_record_value(rbuf, rsiz, xt, &jsiz);
*sp = jsiz;
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, jbuf_, jsiz);
return jbuf_;
}
vbuf += XTWIDTH;
vsiz -= XTWIDTH;
size_t rsiz;
const char* rbuf = visitor_->visit_full(kbuf, ksiz, vbuf, vsiz, &rsiz, &xt);
if (rbuf == TimedDB::Visitor::NOP) return NOP;
if (rbuf == TimedDB::Visitor::REMOVE) {
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, REMOVE, 0);
return REMOVE;
}
delete[] jbuf_;
xt = modify_exptime(xt, ct_);
size_t jsiz;
jbuf_ = make_record_value(rbuf, rsiz, xt, &jsiz);
*sp = jsiz;
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, jbuf_, jsiz);
return jbuf_;
}
const char* visit_empty(const char* kbuf, size_t ksiz, size_t* sp) {
if (db_->opts_ & TimedDB::TPERSIST) {
size_t rsiz;
int64_t xt = kc::INT64MAX;
const char* rbuf = visitor_->visit_empty(kbuf, ksiz, &rsiz, &xt);
*sp = rsiz;
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, rbuf, rsiz);
return rbuf;
}
size_t rsiz;
int64_t xt = -1;
const char* rbuf = visitor_->visit_empty(kbuf, ksiz, &rsiz, &xt);
if (rbuf == TimedDB::Visitor::NOP) return NOP;
if (rbuf == TimedDB::Visitor::REMOVE) {
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, REMOVE, 0);
return REMOVE;
}
delete[] jbuf_;
xt = modify_exptime(xt, ct_);
size_t jsiz;
jbuf_ = make_record_value(rbuf, rsiz, xt, &jsiz);
*sp = jsiz;
if (db_->utrigger_) log_update(db_->utrigger_, kbuf, ksiz, jbuf_, jsiz);
return jbuf_;
}
void visit_before() {
_assert_(true);
visitor_->visit_before();
}
void visit_after() {
_assert_(true);
visitor_->visit_after();
}
TimedDB* db_;
TimedDB::Visitor* visitor_;
int64_t ct_;
bool isiter_;
char* jbuf_;
bool again_;
};
/**
* Trigger of meta database operations.
*/
class TimedMetaTrigger : public kc::BasicDB::MetaTrigger {
public:
TimedMetaTrigger(TimedDB* db) : db_(db) {
_assert_(db);
}
private:
void trigger(Kind kind, const char* message) {
_assert_(message);
if (!db_->utrigger_) return;
switch (kind) {
case CLEAR: {
char mbuf[1];
*mbuf = UCLEAR;
db_->utrigger_->trigger(mbuf, 1);
break;
}
case BEGINTRAN: {
db_->utrigger_->begin_transaction();
break;
}
case COMMITTRAN: {
db_->utrigger_->end_transaction(true);
break;
}
case ABORTTRAN: {
db_->utrigger_->end_transaction(false);
break;
}
default: {
break;
}
}
}
TimedDB* db_;
};
/**
* Front line of a merging list.
*/
struct MergeLine {
TimedDB::Cursor* cur; ///< cursor
kc::Comparator* comp; ///< comparator
char* kbuf; ///< pointer to the key
size_t ksiz; ///< size of the key
const char* vbuf; ///< pointer to the value
size_t vsiz; ///< size of the value
int64_t xt; ///< expiration time
/** comparing operator */
bool operator <(const MergeLine& right) const {
return comp->compare(kbuf, ksiz, right.kbuf, right.ksiz) > 0;
}
};
/**
* Remove expired records.
* @param score the score of expiration.
* @return true on success, or false on failure.
*/
bool expire_records(int64_t score) {
_assert_(score >= 0);
xsc_ += score;
if (xsc_ < XTSCUNIT * XTUNIT) return true;
if (!xlock_.lock_try()) return true;
int64_t step = (int64_t)xsc_ / XTSCUNIT;
xsc_ -= step * XTSCUNIT;
int64_t ct = std::time(NULL);
class VisitorImpl : public kc::BasicDB::Visitor {
public:
VisitorImpl(int64_t ct) : ct_(ct) {}
private:
const char* visit_full(const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz, size_t* sp) {
if (vsiz < (size_t)XTWIDTH) return NOP;
int64_t xt = kc::readfixnum(vbuf, XTWIDTH);
if (ct_ <= xt) return NOP;
return REMOVE;
}
int64_t ct_;
};
VisitorImpl visitor(ct);
bool err = false;
for (int64_t i = 0; i < step; i++) {
if (!xcur_->accept(&visitor, true, true)) {
kc::BasicDB::Error::Code code = db_.error().code();
if (code == kc::BasicDB::Error::INVALID || code == kc::BasicDB::Error::NOREC) {
xcur_->jump();
} else {
err = true;
}
xsc_ = 0;
break;
}
}
if (capcnt_ > 0) {
int64_t count = db_.count();
while (count > capcnt_) {
if (!xcur_->remove()) {
kc::BasicDB::Error::Code code = db_.error().code();
if (code == kc::BasicDB::Error::INVALID || code == kc::BasicDB::Error::NOREC) {
xcur_->jump();
} else {
err = true;
}
break;
}
count--;
}
if (!defrag(step)) err = true;
}
if (capsiz_ > 0) {
int64_t size = db_.size();
if (size > capsiz_) {
for (int64_t i = 0; i < step; i++) {
if (!xcur_->remove()) {
kc::BasicDB::Error::Code code = db_.error().code();
if (code == kc::BasicDB::Error::INVALID || code == kc::BasicDB::Error::NOREC) {
xcur_->jump();
} else {
err = true;
}
break;
}
}
if (!defrag(step)) err = true;
}
}
xlock_.unlock();
return !err;
}
/**
* Perform defragmentation of the database file.
* @param step the number of steps. If it is not more than 0, the whole region is defraged.
* @return true on success, or false on failure.
*/
bool defrag(int step) {
_assert_(true);
bool err = false;
kc::BasicDB* idb = db_.reveal_inner_db();
if (idb) {
const std::type_info& info = typeid(*idb);
if (info == typeid(kc::HashDB)) {
kc::HashDB* hdb = (kc::HashDB*)idb;
if (!hdb->defrag(step)) err = true;
} else if (info == typeid(kc::TreeDB)) {
kc::TreeDB* tdb = (kc::TreeDB*)idb;
if (!tdb->defrag(step)) err = true;
}
}
return !err;
}
/**
* Make the record value with meta data.
* @param vbuf the buffer of the original record value.
* @param vsiz the size of the original record value.
* @param xt the expiration time.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @return the pointer to the result buffer.
*/
static char* make_record_value(const char* vbuf, size_t vsiz, int64_t xt, size_t* sp) {
_assert_(vbuf && vsiz <= kc::MEMMAXSIZ);
size_t jsiz = vsiz + XTWIDTH;
char* jbuf = new char[jsiz];
kc::writefixnum(jbuf, xt, XTWIDTH);
std::memcpy(jbuf + XTWIDTH, vbuf, vsiz);
*sp = jsiz;
return jbuf;
}
/**
* Modify an expiration time by the current time.
* @param xt the expiration time.
* @param ct the current time.
* @return the modified expiration time.
*/
static int64_t modify_exptime(int64_t xt, int64_t ct) {
_assert_(true);
if (xt < 0) {
if (xt < kc::INT64MIN / 2) xt = kc::INT64MIN / 2;
xt = -xt;
} else {
if (xt > kc::INT64MAX / 2) xt = kc::INT64MAX / 2;
xt += ct;
}
if (xt > XTMAX) xt = XTMAX;
return xt;
}
/**
* Log a record update operation.
* @param utrigger the update trigger.
* @param kbuf the pointer to the key region.
* @param ksiz the size of the key region.
* @param vbuf the pointer to the value region.
* @param vsiz the size of the value region.
*/
static void log_update(UpdateTrigger* utrigger, const char* kbuf, size_t ksiz,
const char* vbuf, size_t vsiz) {
_assert_(utrigger && kbuf);
if (vbuf == TimedVisitor::REMOVE) {
size_t msiz = 1 + sizeof(uint64_t) + ksiz;
char stack[LOGBUFSIZ];
char* mbuf = msiz > sizeof(stack) ? new char[msiz] : stack;
char* wp = mbuf;
*(wp++) = UREMOVE;
wp += kc::writevarnum(wp, ksiz);
std::memcpy(wp, kbuf, ksiz);
wp += ksiz;
utrigger->trigger(mbuf, wp - mbuf);
if (mbuf != stack) delete[] mbuf;
} else if (vbuf != TimedVisitor::NOP) {
size_t msiz = 1 + sizeof(uint64_t) * 2 + ksiz + vsiz;
char stack[LOGBUFSIZ];
char* mbuf = msiz > sizeof(stack) ? new char[msiz] : stack;
char* wp = mbuf;
*(wp++) = USET;
wp += kc::writevarnum(wp, ksiz);
wp += kc::writevarnum(wp, vsiz);
std::memcpy(wp, kbuf, ksiz);
wp += ksiz;
std::memcpy(wp, vbuf, vsiz);
wp += vsiz;
utrigger->trigger(mbuf, wp - mbuf);
if (mbuf != stack) delete[] mbuf;
}
}
/** Dummy constructor to forbid the use. */
TimedDB(const TimedDB&);
/** Dummy Operator to forbid the use. */
TimedDB& operator =(const TimedDB&);
/** The expiration cursor lock. */
kc::SpinLock xlock_;
/** The internal database. */
kc::PolyDB db_;
/** The internal meta trigger. */
TimedMetaTrigger mtrigger_;
/** The internal update trigger. */
UpdateTrigger* utrigger_;
/** The open mode. */
uint32_t omode_;
/** The options. */
uint8_t opts_;
/** The capacity of record number. */
int64_t capcnt_;
/** The capacity of memory usage. */
int64_t capsiz_;
/** The cursor for expiration. */
kc::PolyDB::Cursor* xcur_;
/** The score of expiration. */
kc::AtomicInt64 xsc_;
};
} // common namespace
#endif // duplication check
// END OF FILE
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