/usr/include/ossim/imaging/ossimAppTileCache.h is in libossim-dev 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright (C) 2000 ImageLinks Inc.
//
// License: MIT
//
// See LICENSE.txt file in the top level directory for more details.
//
// Author: Garrett Potts
//
// Description: This file contains the Application cache algorithm
//
//***********************************
// $Id: ossimAppTileCache.h 15766 2009-10-20 12:37:09Z gpotts $
#ifndef ossimAppTileCache_HEADER
#define ossimAppTileCache_HEADER
#include <map>
#include <list>
using namespace std;
#include <ossim/base/ossimConstants.h>
#include <ossim/base/ossimDpt3d.h>
#include <ossim/base/ossimRefPtr.h>
// class ossimTile;
class ossimTileCache;
class ossimDataObject;
class ossimAppTileCache
{
public:
static const ossim_uint32 DEFAULT_SIZE;
static const ossim_uint32 DEFAULT_BUCKET_SIZE;
typedef ossim_int32 ossimAppCacheId;
typedef ossim_int32 ossimTileId;
typedef map<ossimAppCacheId, ossimTileCache*>::iterator AppIdIterator;
~ossimAppTileCache();
/*!
* We will force a singleton on this class.
*/
static ossimAppTileCache *instance(ossim_uint32 maxSize = 0);
/*!
* Will create a new Tile cache for this application. Will
* return 0 if not successful.
*/
ossimAppCacheId newTileCache(ossim_uint32 bucketSize=DEFAULT_BUCKET_SIZE);
/*!
* Will retrieve a tile from the cache. Will return NULL
* if not found.
*/
ossimDataObject *get(ossimAppCacheId id,
const ossimDpt3d &origin,
ossim_uint32 resLevel=0);
/*!
* Will remove a tile completly from the cache. The
* returned tile is no longer owned by the cache.
*/
ossimRefPtr<ossimDataObject> removeTile(ossimAppCacheId id,
const ossimDpt3d &origin,
unsigned long resLevel);
/*!
* Will insert a tile into the cache.
*/
ossimRefPtr<ossimDataObject> insert(ossimAppCacheId id,
const ossimDpt3d &origin,
const ossimDataObject* data,
ossim_uint32 resLevel=0);
/*!
* This will delete the specified cache. The LRU queue will
* be updated accordingly
*/
void deleteCache(ossimAppCacheId appId);
protected:
struct ossimAppCacheTileInfo
{
public:
ossimAppCacheTileInfo(ossimAppCacheId appId,
const ossimDpt3d& origin,
ossim_uint32 resLevel)
:theAppCacheId(appId),
theOrigin(origin),
theResLevel(resLevel)
{}
ossimAppCacheId theAppCacheId;
ossimDpt3d theOrigin;
ossim_uint32 theResLevel;
bool operator ==(const ossimAppCacheTileInfo &rhs)
{
return (theAppCacheId == rhs.theAppCacheId &&
theOrigin == rhs.theOrigin &&
theResLevel == rhs.theResLevel);
}
};
ossimAppTileCache(ossim_uint32 maxSize = DEFAULT_SIZE)
:
theMaxCacheSize(maxSize),
theCurrentCacheSize(0)
{}
void deleteAll();
/*!
* Used to get access to the App cache.
*/
ossimTileCache* get(ossimAppCacheId id);
/*!
* will remove all occurances of the appId from the
* queue
*/
void deleteAppCacheFromQueue(ossimAppCacheId appId);
/*!
* Will remove a single instance of a tile from the queue.
*/
void removeTileFromQueue(ossimAppCacheId appId,
const ossimDpt3d &origin,
ossim_uint32 resLevel);
void adjustQueue(ossimAppCacheId id,
const ossimDpt3d &origin,
ossim_uint32 resLevel);
/*!
* will pop the queue and remove that tile from its cache
* and return it to the caller. This is used by the insert
* when the max cache size is exceeded.
*/
ossimRefPtr<ossimDataObject> removeTile();
static ossimAppTileCache *theInstance;
/*!
* Will hold the current unique Application id.
*/
static ossimAppCacheId theUniqueAppIdCounter;
/*!
* Will hold the list of application caches
*/
map<ossimAppCacheId, ossimTileCache*> theAppCache;
/*!
* Is the maximum size of the cache.
*/
ossim_uint32 theMaxGlobalCacheSize;
ossim_uint32 theMaxCacheSize;
/*!
* This holds the current cache size.
*/
ossim_uint32 theCurrentCacheSize;
/*!
* Is used in an Least recently used algorithm
*/
list<ossimAppCacheTileInfo> theUsedQueue;
};
#endif
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