bool
ResourceCache::getOrCreateStateSet(SkinResource* skin,
osg::ref_ptr<osg::StateSet>& output)
{
output = 0L;
std::string key = skin->getConfig().toJSON(false);
// exclusive lock (since it's an LRU)
{
Threading::ScopedMutexLock exclusive( _skinMutex );
// double check to avoid race condition
SkinCache::Record rec;
if ( _skinCache.get(key, rec) && rec.value().valid() )
{
output = rec.value().get();
}
else
{
// still not there, make it.
output = skin->createStateSet( _dbOptions.get() );
if ( output.valid() )
{
_skinCache.insert( key, output.get() );
}
}
}
return output.valid();
}
osg::StateSet*
ResourceCache::getStateSet( SkinResource* skin )
{
osg::StateSet* result = 0L;
if ( _threadSafe )
{
// first check if it exists
{
Threading::ScopedReadLock shared( _mutex );
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
{
result = rec.value();
}
}
// no? exclusive lock and create it.
if ( !result )
{
Threading::ScopedWriteLock exclusive( _mutex );
// double check to avoid race condition
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
{
result = rec.value();
}
else
{
// still not there, make it.
result = skin->createStateSet( _dbOptions.get() );
if ( result )
_skinCache.insert( skin, result );
}
}
}
else
{
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
{
result = rec.value();
}
else
{
result = skin->createStateSet( _dbOptions.get() );
if ( result )
_skinCache.insert( skin, result );
}
}
return result;
}
osg::StateSet*
ResourceCache::getStateSet( SkinResource* skin )
{
// first check if it exists
{
Threading::ScopedReadLock shared( _skinCacheMutex );
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
return rec.value();
}
// no? exclusive lock and create it.
{
Threading::ScopedWriteLock exclusive( _skinCacheMutex );
// double check to avoid race condition
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
return rec.value();
// still not there, make it.
osg::StateSet* stateSet = skin->createStateSet();
if ( stateSet )
_skinCache.insert( skin, stateSet );
return stateSet;
}
}
bool
ResourceCache::getOrCreateStateSet(SkinResource* skin,
osg::ref_ptr<osg::StateSet>& output,
const osgDB::Options* readOptions)
{
output = 0L;
//std::string key = skin->getConfig().toJSON(false);
// Note: we use the imageURI as the basis for the caching key since
// it's the only property used by Skin->createStateSet(). If that
// changes, we need to address it here. It might be better it SkinResource
// were to provide a unique key.
std::string key = skin->getUniqueID();
// exclusive lock (since it's an LRU)
{
Threading::ScopedMutexLock exclusive( _skinMutex );
// double check to avoid race condition
SkinCache::Record rec;
if ( _skinCache.get(key, rec) && rec.value().valid() )
{
output = rec.value().get();
}
else
{
// still not there, make it.
output = skin->createStateSet(readOptions);
if ( output.valid() )
{
_skinCache.insert( key, output.get() );
}
}
}
return output.valid();
}
