| /* |
| * Copyright 2009-2013 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.hyracks.dataflow.std.sort; |
| |
| import java.nio.ByteBuffer; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import edu.uci.ics.hyracks.api.comm.IFrameReader; |
| import edu.uci.ics.hyracks.api.comm.IFrameWriter; |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.api.io.FileReference; |
| import edu.uci.ics.hyracks.dataflow.common.io.RunFileWriter; |
| |
| public class ExternalSortRunGenerator implements IFrameWriter { |
| private final IHyracksTaskContext ctx; |
| private final FrameSorter frameSorter; |
| private final List<IFrameReader> runs; |
| private final int maxSortFrames; |
| |
| public ExternalSortRunGenerator(IHyracksTaskContext ctx, int[] sortFields, |
| INormalizedKeyComputerFactory firstKeyNormalizerFactory, IBinaryComparatorFactory[] comparatorFactories, |
| RecordDescriptor recordDesc, int framesLimit) { |
| this.ctx = ctx; |
| frameSorter = new FrameSorter(ctx, sortFields, firstKeyNormalizerFactory, comparatorFactories, recordDesc); |
| runs = new LinkedList<IFrameReader>(); |
| maxSortFrames = framesLimit - 1; |
| } |
| |
| @Override |
| public void open() throws HyracksDataException { |
| runs.clear(); |
| frameSorter.reset(); |
| } |
| |
| @Override |
| public void nextFrame(ByteBuffer buffer) throws HyracksDataException { |
| if (frameSorter.getFrameCount() >= maxSortFrames) { |
| flushFramesToRun(); |
| } |
| frameSorter.insertFrame(buffer); |
| } |
| |
| @Override |
| public void close() throws HyracksDataException { |
| if (frameSorter.getFrameCount() > 0) { |
| if (runs.size() <= 0) { |
| frameSorter.sortFrames(); |
| } else { |
| flushFramesToRun(); |
| } |
| } |
| } |
| |
| private void flushFramesToRun() throws HyracksDataException { |
| frameSorter.sortFrames(); |
| FileReference file = ctx.getJobletContext().createManagedWorkspaceFile( |
| ExternalSortRunGenerator.class.getSimpleName()); |
| RunFileWriter writer = new RunFileWriter(file, ctx.getIOManager()); |
| writer.open(); |
| try { |
| frameSorter.flushFrames(writer); |
| } finally { |
| writer.close(); |
| } |
| frameSorter.reset(); |
| runs.add(writer.createReader()); |
| } |
| |
| @Override |
| public void fail() throws HyracksDataException { |
| } |
| |
| public FrameSorter getFrameSorter() { |
| return frameSorter; |
| } |
| |
| public List<IFrameReader> getRuns() { |
| return runs; |
| } |
| } |