| /* |
| * 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.collectors; |
| |
| import java.nio.ByteBuffer; |
| |
| 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.dataflow.common.comm.util.FrameUtils; |
| |
| public class NonDeterministicFrameReader implements IFrameReader { |
| private final NonDeterministicChannelReader channelReader; |
| |
| public NonDeterministicFrameReader(NonDeterministicChannelReader channelReader) { |
| this.channelReader = channelReader; |
| } |
| |
| @Override |
| public void open() throws HyracksDataException { |
| channelReader.open(); |
| } |
| |
| @Override |
| public boolean nextFrame(ByteBuffer buffer) throws HyracksDataException { |
| int index = channelReader.findNextSender(); |
| if (index >= 0) { |
| IInputChannel[] channels = channelReader.getChannels(); |
| ByteBuffer srcFrame = channels[index].getNextBuffer(); |
| FrameUtils.copy(srcFrame, buffer); |
| channels[index].recycleBuffer(srcFrame); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public synchronized void close() throws HyracksDataException { |
| channelReader.close(); |
| } |
| } |