| /* |
| * 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.pregelix.runtime.function; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import edu.uci.ics.hyracks.api.comm.IFrameWriter; |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAppender; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import edu.uci.ics.hyracks.storage.am.common.api.IIndexCursor; |
| import edu.uci.ics.pregelix.api.graph.MsgList; |
| import edu.uci.ics.pregelix.api.graph.Vertex; |
| import edu.uci.ics.pregelix.api.util.FrameTupleUtils; |
| import edu.uci.ics.pregelix.dataflow.std.base.IUpdateFunction; |
| import edu.uci.ics.pregelix.dataflow.std.base.IUpdateFunctionFactory; |
| |
| @SuppressWarnings("rawtypes") |
| public class ExtractLiveVertexIdFunctionFactory implements IUpdateFunctionFactory { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public IUpdateFunction createFunction() { |
| return new IUpdateFunction() { |
| // for writing intermediate data |
| private final ArrayTupleBuilder alive = new ArrayTupleBuilder(2); |
| |
| // for writing out to alive message channel |
| private IFrameWriter writerAlive; |
| private FrameTupleAppender appenderAlive; |
| private ByteBuffer bufferAlive; |
| |
| private MsgList dummyMessageList = new MsgList(); |
| private Vertex vertex; |
| |
| @Override |
| public void open(IHyracksTaskContext ctx, RecordDescriptor rd, IFrameWriter... writers) |
| throws HyracksDataException { |
| this.writerAlive = writers[0]; |
| this.bufferAlive = ctx.allocateFrame(); |
| this.appenderAlive = new FrameTupleAppender(ctx.getFrameSize()); |
| this.appenderAlive.reset(bufferAlive, true); |
| } |
| |
| @Override |
| public void process(Object[] tuple) throws HyracksDataException { |
| try { |
| // vertex Id, vertex |
| alive.reset(); |
| vertex = (Vertex) tuple[1]; |
| if (!vertex.isHalted()) { |
| alive.reset(); |
| DataOutput outputAlive = alive.getDataOutput(); |
| vertex.getVertexId().write(outputAlive); |
| alive.addFieldEndOffset(); |
| dummyMessageList.write(outputAlive); |
| alive.addFieldEndOffset(); |
| FrameTupleUtils.flushTuple(appenderAlive, alive, writerAlive); |
| } |
| } catch (IOException e) { |
| throw new HyracksDataException(e); |
| } |
| |
| } |
| |
| @Override |
| public void close() throws HyracksDataException { |
| FrameTupleUtils.flushTuplesFinal(appenderAlive, writerAlive); |
| } |
| |
| @Override |
| public void update(ITupleReference tupleRef, ArrayTupleBuilder cloneUpdateTb, IIndexCursor cursor) |
| throws HyracksDataException { |
| |
| } |
| }; |
| } |
| } |