if(logger.isInfoEnabled()){
logger.info("Cache " + (enableCache ? "enabled (size=" + cacheSize + ")" : "disabled") + "." );
}
// create the cache
source = new QueryDataSource( this.executionStrategy, this.manager );
cache = new FIFOCache( source, cacheSize );
//cache = new LRUCache(source, cacheSize);
// get the configuration of time measure
isRecordTime = Boolean.parseBoolean(property.getProperty("timeMeasure", "" + isRecordTime));