| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package edu.uci.ics.pregelix.dataflow.util; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import edu.uci.ics.hyracks.storage.am.btree.impls.RangePredicate; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexAccessor; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexCursor; |
| import edu.uci.ics.hyracks.storage.am.common.api.IndexException; |
| |
| public class CopyUpdateUtil { |
| |
| public static void copyUpdate(SearchKeyTupleReference tempTupleReference, ITupleReference frameTuple, |
| UpdateBuffer updateBuffer, ArrayTupleBuilder cloneUpdateTb, ITreeIndexAccessor indexAccessor, |
| ITreeIndexCursor cursor, RangePredicate rangePred) throws HyracksDataException, IndexException { |
| if (cloneUpdateTb.getSize() > 0) { |
| if (!updateBuffer.appendTuple(cloneUpdateTb)) { |
| tempTupleReference.reset(frameTuple.getFieldData(0), frameTuple.getFieldStart(0), |
| frameTuple.getFieldLength(0)); |
| //release the cursor/latch |
| cursor.close(); |
| //batch update |
| updateBuffer.updateBTree(indexAccessor); |
| //try append the to-be-updated tuple again |
| if (!updateBuffer.appendTuple(cloneUpdateTb)) { |
| throw new HyracksDataException("cannot append tuple builder!"); |
| } |
| //search again and recover the cursor |
| cursor.reset(); |
| rangePred.setLowKey(tempTupleReference, false); |
| rangePred.setHighKey(null, true); |
| indexAccessor.search(cursor, rangePred); |
| } |
| cloneUpdateTb.reset(); |
| } |
| } |
| |
| } |