void LLVOCache::initCache(ELLPath location, U32 size, U32 cache_version)
{
if(mInitialized)
{
return ;
}
setDirNames(location);
if (!mReadOnly)
{
LLFile::mkdir(mObjectCacheDirName);
}
mCacheSize = llclamp(size,
MAX_NUM_OBJECT_ENTRIES, NUM_ENTRIES_TO_PURGE);
mMetaInfo.mVersion = cache_version;
readCacheHeader();
mInitialized = TRUE ;
if(mMetaInfo.mVersion != cache_version)
{
mMetaInfo.mVersion = cache_version ;
if(mReadOnly) //disable cache
{
clearCacheInMemory();
}
else //delete the current cache if the format does not match.
{
removeCache();
}
}
}
void ItemDelegate::rowsRemoved(const QModelIndex &, int start, int end)
{
for( int i = end; i >= start; --i ) {
removeCache(i);
m_cache.removeAt(i);
}
}
void ItemDelegate::dataChanged(const QModelIndex &a, const QModelIndex &b)
{
// recalculating sizes of many items is expensive (when searching)
// - assume that highlighted (matched) text has same size
// - recalculate size only if item edited
int row = a.row();
if ( row == b.row() ) {
removeCache(row);
emit sizeHintChanged(a);
}
}
BOOL LLVOCache::checkWrite(LLAPRFile* apr_file, void* src, S32 n_bytes)
{
if(!check_write(apr_file, src, n_bytes))
{
delete apr_file ;
removeCache() ;
return FALSE ;
}
return TRUE ;
}
void LLVOCache::initCache(ELLPath location, U32 size, U32 cache_version)
{
if(!mEnabled)
{
llwarns << "Not initializing cache: Cache is currently disabled." << llendl;
return ;
}
if(mInitialized)
{
llwarns << "Cache already initialized." << llendl;
return ;
}
mInitialized = TRUE ;
setDirNames(location);
if (!mReadOnly)
{
LLFile::mkdir(mObjectCacheDirName);
}
mCacheSize = llclamp(size, MIN_ENTRIES_TO_PURGE, MAX_NUM_OBJECT_ENTRIES);
mMetaInfo.mVersion = cache_version;
readCacheHeader();
if(mMetaInfo.mVersion != cache_version)
{
mMetaInfo.mVersion = cache_version ;
if(mReadOnly) //disable cache
{
clearCacheInMemory();
}
else //delete the current cache if the format does not match.
{
removeCache();
}
}
}
void ItemDelegate::invalidateCache()
{
for( int i = 0; i < m_cache.length(); ++i )
removeCache(i);
}
void ItemDelegate::removeCache(const QModelIndex &index)
{
removeCache(index.row());
}
void LLVOCache::readCacheHeader()
{
if(!mEnabled)
{
llwarns << "Not reading cache header: Cache is currently disabled." << llendl;
return;
}
//clear stale info.
clearCacheInMemory();
bool success = true ;
if (LLAPRFile::isExist(mHeaderFileName, mLocalAPRFilePoolp))
{
LLAPRFile apr_file(mHeaderFileName, APR_READ|APR_BINARY, mLocalAPRFilePoolp);
//read the meta element
success = check_read(&apr_file, &mMetaInfo, sizeof(HeaderMetaInfo)) ;
if(success)
{
HeaderEntryInfo* entry = NULL ;
mNumEntries = 0 ;
U32 num_read = 0 ;
while(num_read++ < MAX_NUM_OBJECT_ENTRIES)
{
if(!entry)
{
entry = new HeaderEntryInfo() ;
}
success = check_read(&apr_file, entry, sizeof(HeaderEntryInfo));
if(!success) //failed
{
llwarns << "Error reading cache header entry. (entry_index=" << mNumEntries << ")" << llendl;
delete entry ;
entry = NULL ;
break ;
}
else if(entry->mTime == INVALID_TIME)
{
continue ; //an empty entry
}
entry->mIndex = mNumEntries++ ;
mHeaderEntryQueue.insert(entry) ;
mHandleEntryMap[entry->mHandle] = entry ;
entry = NULL ;
}
if(entry)
{
delete entry ;
}
}
//---------
//debug code
//----------
//std::string name ;
//for(header_entry_queue_t::iterator iter = mHeaderEntryQueue.begin() ; success && iter != mHeaderEntryQueue.end(); ++iter)
//{
// getObjectCacheFilename((*iter)->mHandle, name) ;
// llinfos << name << llendl ;
//}
//-----------
}
else
{
writeCacheHeader() ;
}
if(!success)
{
removeCache() ; //failed to read header, clear the cache
}
else if(mNumEntries >= mCacheSize)
{
purgeEntries(mCacheSize) ;
}
return ;
}
void LLVOCache::writeToCache(U64 handle, const LLUUID& id, const LLVOCacheEntry::vocache_entry_map_t& cache_entry_map, BOOL dirty_cache)
{
llassert_always(mInitialized);
if(mReadOnly)
{
return ;
}
HeaderEntryInfo* entry;
handle_entry_map_t::iterator iter = mHandleEntryMap.find(handle) ;
if(iter == mHandleEntryMap.end()) //new entry
{
if(mNumEntries >= mCacheSize)
{
purgeEntries() ;
}
entry = new HeaderEntryInfo();
entry->mHandle = handle ;
entry->mTime = time(NULL) ;
entry->mIndex = mNumEntries++ ;
mHeaderEntryQueue.insert(entry) ;
mHandleEntryMap[handle] = entry ;
}
else
{
entry = iter->second ;
entry->mTime = time(NULL) ;
//resort
mHeaderEntryQueue.erase(entry) ;
mHeaderEntryQueue.insert(entry) ;
}
//update cache header
if(!updateEntry(entry))
{
return ; //update failed.
}
if(!dirty_cache)
{
return ; //nothing changed, no need to update.
}
//write to cache file
std::string filename;
getObjectCacheFilename(handle, filename);
LLAPRFile* apr_file = new LLAPRFile(filename, APR_CREATE|APR_WRITE|APR_BINARY, mLocalAPRFilePoolp);
if(!checkWrite(apr_file, (void*)id.mData, UUID_BYTES))
{
return ;
}
S32 num_entries = cache_entry_map.size() ;
if(!checkWrite(apr_file, &num_entries, sizeof(S32)))
{
return ;
}
for (LLVOCacheEntry::vocache_entry_map_t::const_iterator iter = cache_entry_map.begin(); iter != cache_entry_map.end(); ++iter)
{
if(!iter->second->writeToFile(apr_file))
{
//failed
delete apr_file ;
removeCache() ;
return ;
}
}
delete apr_file ;
return ;
}
