private List getBlockKeys ( QueryConditonDatakey qcdk ) { List keys = blockCacheManager . getBlockKeysFromCache ( qcdk ) ; if ( ( keys == null ) ) { keys = blockQueryJDBC . fetchDatas ( qcdk ) ; if ( keys != null && keys . size ( ) != 0 ) blockCacheManager . saveBlockKeys ( qcdk , keys ) ; } Debug . logVerbose ( "[JdonFramework] getBlockKeys, size=" + keys . size ( ) , module ) ; return keys ; }
get a Block that begin at the start