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/**
* @file llvocache.h
* @brief Cache of objects on the viewer.
*
* $LicenseInfo:firstyear=2003&license=viewergpl$
*
* Copyright (c) 2003-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLVOCACHE_H
#define LL_LLVOCACHE_H
#include "lluuid.h"
#include "lldatapacker.h"
#include "lldlinked.h"
//---------------------------------------------------------------------------
// Cache entries
class LLVOCacheEntry;
class LLVOCacheEntry
{
public:
LLVOCacheEntry(U32 local_id, U32 crc, LLDataPackerBinaryBuffer &dp);
LLVOCacheEntry(LLAPRFile* apr_file);
LLVOCacheEntry();
~LLVOCacheEntry();
U32 getLocalID() const { return mLocalID; }
U32 getCRC() const { return mCRC; }
S32 getHitCount() const { return mHitCount; }
S32 getCRCChangeCount() const { return mCRCChangeCount; }
void dump() const;
BOOL writeToFile(LLAPRFile* apr_file) const;
void assignCRC(U32 crc, LLDataPackerBinaryBuffer &dp);
LLDataPackerBinaryBuffer *getDP(U32 crc);
void recordHit();
void recordDupe() { mDupeCount++; }
public:
typedef std::map<U32, LLVOCacheEntry*> vocache_entry_map_t;
protected:
U32 mLocalID;
U32 mCRC;
S32 mHitCount;
S32 mDupeCount;
S32 mCRCChangeCount;
LLDataPackerBinaryBuffer mDP;
U8 *mBuffer;
};
//
//Note: LLVOCache is not thread-safe
//
class LLVOCache
{
private:
struct HeaderEntryInfo
{
HeaderEntryInfo() : mIndex(0), mHandle(0), mTime(0) {}
S32 mIndex;
U64 mHandle ;
U32 mTime ;
};
struct HeaderMetaInfo
{
HeaderMetaInfo() : mVersion(0){}
U32 mVersion;
};
struct header_entry_less
{
bool operator()(const HeaderEntryInfo* lhs, const HeaderEntryInfo* rhs) const
{
return lhs->mTime < rhs->mTime; // older entry in front of queue (set)
}
};
typedef std::set<HeaderEntryInfo*, header_entry_less> header_entry_queue_t;
typedef std::map<U64, HeaderEntryInfo*> handle_entry_map_t;
private:
LLVOCache() ;
public:
~LLVOCache() ;
void initCache(ELLPath location, U32 size, U32 cache_version) ;
void removeCache(ELLPath location) ;
void readFromCache(U64 handle, const LLUUID& id, LLVOCacheEntry::vocache_entry_map_t& cache_entry_map) ;
void writeToCache(U64 handle, const LLUUID& id, const LLVOCacheEntry::vocache_entry_map_t& cache_entry_map, BOOL dirty_cache) ;
void setReadOnly(BOOL read_only) {mReadOnly = read_only;}
private:
void setDirNames(ELLPath location);
// determine the cache filename for the region from the region handle
void getObjectCacheFilename(U64 handle, std::string& filename);
void removeFromCache(U64 handle);
void readCacheHeader();
void writeCacheHeader();
void clearCacheInMemory();
void removeCache() ;
void purgeEntries();
BOOL updateEntry(const HeaderEntryInfo* entry);
BOOL checkRead(LLAPRFile* apr_file, void* src, S32 n_bytes) ;
BOOL checkWrite(LLAPRFile* apr_file, void* src, S32 n_bytes) ;
private:
BOOL mInitialized ;
BOOL mReadOnly ;
HeaderMetaInfo mMetaInfo;
U32 mCacheSize;
U32 mNumEntries;
std::string mHeaderFileName ;
std::string mObjectCacheDirName;
LLVolatileAPRPool* mLocalAPRFilePoolp ;
header_entry_queue_t mHeaderEntryQueue;
handle_entry_map_t mHandleEntryMap;
static LLVOCache* sInstance ;
public:
static LLVOCache* getInstance() ;
static BOOL hasInstance() ;
static void destroyClass() ;
};
#endif
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