/usr/include/mapnik/pool.hpp is in libmapnik-dev 2.2.0+ds1-6build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_POOL_HPP
#define MAPNIK_POOL_HPP
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/utils.hpp>
#include <mapnik/noncopyable.hpp>
// boost
#include <boost/shared_ptr.hpp>
#ifdef MAPNIK_THREADSAFE
#include <boost/thread/mutex.hpp>
#endif
// stl
#include <map>
#include <deque>
#include <ctime>
#include <cassert>
namespace mapnik
{
template <typename T,template <typename> class Creator>
class Pool : private mapnik::noncopyable
{
typedef boost::shared_ptr<T> HolderType;
typedef std::deque<HolderType> ContType;
Creator<T> creator_;
unsigned initialSize_;
unsigned maxSize_;
ContType pool_;
#ifdef MAPNIK_THREADSAFE
mutable boost::mutex mutex_;
#endif
public:
Pool(const Creator<T>& creator,unsigned initialSize, unsigned maxSize)
:creator_(creator),
initialSize_(initialSize),
maxSize_(maxSize)
{
for (unsigned i=0; i < initialSize_; ++i)
{
HolderType conn(creator_());
if (conn->isOK())
pool_.push_back(conn);
}
}
HolderType borrowObject()
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
typename ContType::iterator itr=pool_.begin();
while ( itr!=pool_.end())
{
if (!itr->unique())
{
++itr;
}
else if ((*itr)->isOK())
{
MAPNIK_LOG_DEBUG(pool) << "pool: Borrow instance=" << (*itr).get();
return *itr;
}
else
{
MAPNIK_LOG_DEBUG(pool) << "pool: Bad connection (erase) instance=" << (*itr).get();
itr=pool_.erase(itr);
}
}
// all connection have been taken, check if we allowed to grow pool
if (pool_.size() < maxSize_)
{
HolderType conn(creator_());
if (conn->isOK())
{
pool_.push_back(conn);
MAPNIK_LOG_DEBUG(pool) << "pool: Create connection=" << conn.get();
return conn;
}
}
return HolderType();
}
unsigned size() const
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
return pool_.size();
}
unsigned max_size() const
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
return maxSize_;
}
void set_max_size(unsigned size)
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
maxSize_ = std::max(maxSize_,size);
}
unsigned initial_size() const
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
return initialSize_;
}
void set_initial_size(unsigned size)
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
if (size > initialSize_)
{
initialSize_ = size;
unsigned total_size = pool_.size();
// ensure we don't have ghost obj's in the pool.
if (total_size < initialSize_)
{
unsigned grow_size = initialSize_ - total_size ;
for (unsigned i=0; i < grow_size; ++i)
{
HolderType conn(creator_());
if (conn->isOK())
pool_.push_back(conn);
}
}
}
}
};
}
#endif // MAPNIK_POOL_HPP
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