bool InstanceCache::add( const ObjectVersion& rev, const uint32_t instanceID,
Command& command, const uint32_t usage )
{
#ifdef EQ_INSTRUMENT_CACHE
++nWrite;
#endif
const NodeID nodeID = command.getNode()->getNodeID();
base::ScopedMutex<> mutex( _items );
ItemHash::const_iterator i = _items->find( rev.identifier );
if( i == _items->end( ))
{
Item& item = _items.data[ rev.identifier ];
item.data.masterInstanceID = instanceID;
item.from = nodeID;
}
Item& item = _items.data[ rev.identifier ] ;
if( item.data.masterInstanceID != instanceID || item.from != nodeID )
{
EQASSERT( !item.access ); // same master with different instance ID?!
if( item.access != 0 ) // are accessed - don't add
return false;
// trash data from different master mapping
_releaseStreams( item );
item.data.masterInstanceID = instanceID;
item.from = nodeID;
item.used = usage;
}
else
item.used = EQ_MAX( item.used, usage );
if( item.data.versions.empty( ))
{
item.data.versions.push_back( new ObjectDataIStream );
item.times.push_back( _clock.getTime64( ));
}
else if( item.data.versions.back()->getPendingVersion() == rev.version )
{
if( item.data.versions.back()->isReady( ))
{
#ifdef EQ_INSTRUMENT_CACHE
++nWriteReady;
#endif
return false; // Already have stream
}
// else append data to stream
}
else
{
const ObjectDataIStream* previous = item.data.versions.back();
EQASSERT( previous->isReady( ));
const uint128_t previousVersion = previous->getPendingVersion();
if( previousVersion > rev.version )
{
#ifdef EQ_INSTRUMENT_CACHE
++nWriteOld;
#endif
return false;
}
if( ( previousVersion + 1 ) != rev.version ) // hole
{
EQASSERT( previousVersion < rev.version );
if( item.access != 0 ) // are accessed - don't add
return false;
_releaseStreams( item );
}
else
{
EQASSERT( previous->isReady( ));
}
item.data.versions.push_back( new ObjectDataIStream );
item.times.push_back( _clock.getTime64( ));
}
EQASSERT( !item.data.versions.empty( ));
ObjectDataIStream* stream = item.data.versions.back();
stream->addDataPacket( command );
if( stream->isReady( ))
_size += stream->getDataSize();
_releaseItems( 1 );
_releaseItems( 0 );
#ifdef EQ_INSTRUMENT_CACHE
if( _items->find( rev.identifier ) != _items->end( ))
++nWriteHit;
else
++nWriteMiss;
#endif
return true;
}
