1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/**
* @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"
//---------------------------------------------------------------------------
// 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
|
