@Override
    public DefaultNodeConfiguration loadDefaultConfiguration( PubSubService.UniqueIdentifier serviceIdentifier, boolean isLeafType )
    {
        log.debug( "Loading default node configuration for service {} (for leaf type: {}).", serviceIdentifier, isLeafType );
        final String key = getDefaultNodeConfigurationCacheKey( serviceIdentifier, isLeafType );
        return defaultNodeConfigurationCache.get( key );
    }
Cache that holds all published items (mapped by node ID).
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/InMemoryPubSubPersistenceProvider.java