| /* |
| * 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; |
| |
| import java.nio.ByteBuffer; |
| |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable; |
| import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.api.job.JobSpecification; |
| import edu.uci.ics.hyracks.dataflow.common.io.RunFileReader; |
| import edu.uci.ics.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor; |
| import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryInputUnaryOutputOperatorNodePushable; |
| import edu.uci.ics.pregelix.dataflow.state.MaterializerTaskState; |
| import edu.uci.ics.pregelix.dataflow.util.IterationUtils; |
| |
| public class MaterializingReadOperatorDescriptor extends AbstractSingleActivityOperatorDescriptor { |
| private static final long serialVersionUID = 1L; |
| |
| public MaterializingReadOperatorDescriptor(JobSpecification spec, RecordDescriptor recordDescriptor) { |
| super(spec, 1, 1); |
| recordDescriptors[0] = recordDescriptor; |
| } |
| |
| @Override |
| public IOperatorNodePushable createPushRuntime(final IHyracksTaskContext ctx, |
| IRecordDescriptorProvider recordDescProvider, final int partition, int nPartitions) { |
| return new AbstractUnaryInputUnaryOutputOperatorNodePushable() { |
| private ByteBuffer frame = ctx.allocateFrame(); |
| private boolean complete = false; |
| |
| @Override |
| public void open() throws HyracksDataException { |
| |
| } |
| |
| @Override |
| public void nextFrame(ByteBuffer buffer) throws HyracksDataException { |
| if (!complete) { |
| MaterializerTaskState state = (MaterializerTaskState) IterationUtils.getIterationState(ctx, |
| partition); |
| RunFileReader in = state.getRunFileWriter().createReader(); |
| writer.open(); |
| try { |
| in.open(); |
| while (in.nextFrame(frame)) { |
| frame.flip(); |
| writer.nextFrame(frame); |
| frame.clear(); |
| } |
| in.close(); |
| } catch (Exception e) { |
| writer.fail(); |
| throw new HyracksDataException(e); |
| } |
| } |
| } |
| |
| @Override |
| public void fail() throws HyracksDataException { |
| |
| } |
| |
| @Override |
| public void close() throws HyracksDataException { |
| /** |
| * remove last iteration's state |
| */ |
| IterationUtils.removeIterationState(ctx, partition); |
| writer.close(); |
| complete = true; |
| } |
| }; |
| } |
| } |