| /* |
| * 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.hyracks.dataflow.std.collectors; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import edu.uci.ics.hyracks.api.channels.IInputChannel; |
| import edu.uci.ics.hyracks.api.comm.IFrameReader; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.api.partitions.PartitionId; |
| |
| public class NonDeterministicPartitionBatchManager implements IPartitionBatchManager { |
| private final IInputChannel[] channels; |
| |
| private List<IFrameReader> partitions; |
| |
| private List<IFrameReader> batch; |
| |
| private int requiredSize; |
| |
| public NonDeterministicPartitionBatchManager(int nSenders) { |
| channels = new IInputChannel[nSenders]; |
| partitions = new ArrayList<IFrameReader>(); |
| } |
| |
| @Override |
| public synchronized void addPartition(PartitionId pid, IInputChannel channel) { |
| channels[pid.getSenderIndex()] = channel; |
| InputChannelFrameReader channelReader = new InputChannelFrameReader(channel); |
| channel.registerMonitor(channelReader); |
| if (batch != null && batch.size() < requiredSize) { |
| batch.add(channelReader); |
| if (batch.size() == requiredSize) { |
| notifyAll(); |
| } |
| } else { |
| partitions.add(channelReader); |
| } |
| } |
| |
| @Override |
| public synchronized void getNextBatch(List<IFrameReader> batch, int size) throws HyracksDataException { |
| if (partitions.size() <= size) { |
| batch.addAll(partitions); |
| partitions.clear(); |
| } else if (partitions.size() > size) { |
| List<IFrameReader> sublist = partitions.subList(0, size); |
| batch.addAll(sublist); |
| sublist.clear(); |
| } |
| if (batch.size() == size) { |
| return; |
| } |
| this.batch = batch; |
| this.requiredSize = size; |
| while (batch.size() < size) { |
| try { |
| wait(); |
| } catch (InterruptedException e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| this.batch = null; |
| } |
| } |