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/**
* @file llvocache.h
* @brief Cache of objects on the viewer.
*
* $LicenseInfo:firstyear=2003&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLVOCACHE_H
#define LL_LLVOCACHE_H
#include "lluuid.h"
#include "lldatapacker.h"
#include "lldlinked.h"
#include "lldir.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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