| /* |
| * 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.control.nc.partitions; |
| |
| import java.nio.ByteBuffer; |
| import java.util.concurrent.Executor; |
| |
| import edu.uci.ics.hyracks.api.comm.IFrameWriter; |
| import edu.uci.ics.hyracks.api.context.IHyracksRootContext; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.api.io.FileHandle; |
| import edu.uci.ics.hyracks.api.io.FileReference; |
| import edu.uci.ics.hyracks.api.io.IIOManager; |
| import edu.uci.ics.hyracks.api.partitions.IPartition; |
| import edu.uci.ics.hyracks.control.nc.io.IOManager; |
| |
| public class MaterializedPartition implements IPartition { |
| private final IHyracksRootContext ctx; |
| |
| private final FileReference partitionFile; |
| |
| private final Executor executor; |
| |
| private final IOManager ioManager; |
| |
| public MaterializedPartition(IHyracksRootContext ctx, FileReference partitionFile, Executor executor, |
| IOManager ioManager) { |
| this.ctx = ctx; |
| this.partitionFile = partitionFile; |
| this.executor = executor; |
| this.ioManager = ioManager; |
| } |
| |
| @Override |
| public void deallocate() { |
| partitionFile.delete(); |
| } |
| |
| @Override |
| public void writeTo(final IFrameWriter writer) { |
| executor.execute(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| FileHandle fh = ioManager.open(partitionFile, IIOManager.FileReadWriteMode.READ_ONLY, |
| IIOManager.FileSyncMode.METADATA_ASYNC_DATA_ASYNC); |
| try { |
| writer.open(); |
| try { |
| long offset = 0; |
| ByteBuffer buffer = ctx.allocateFrame(); |
| while (true) { |
| buffer.clear(); |
| long size = ioManager.syncRead(fh, offset, buffer); |
| if (size < 0) { |
| break; |
| } else if (size < buffer.capacity()) { |
| throw new HyracksDataException("Premature end of file"); |
| } |
| offset += size; |
| buffer.flip(); |
| writer.nextFrame(buffer); |
| } |
| } finally { |
| writer.close(); |
| } |
| } finally { |
| ioManager.close(fh); |
| } |
| } catch (HyracksDataException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| }); |
| } |
| |
| @Override |
| public boolean isReusable() { |
| return true; |
| } |
| } |