| /* |
| * 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.touchpoint; |
| |
| import java.io.DataInputStream; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor; |
| import edu.uci.ics.hyracks.api.dataflow.value.ITuplePartitionComputer; |
| import edu.uci.ics.hyracks.api.dataflow.value.ITuplePartitionComputerFactory; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.comm.util.ByteBufferInputStream; |
| import edu.uci.ics.pregelix.api.graph.VertexPartitioner; |
| import edu.uci.ics.pregelix.api.util.BspUtils; |
| import edu.uci.ics.pregelix.dataflow.base.IConfigurationFactory; |
| |
| /** |
| * The vertex-based partition computer factory. |
| * It is used to support customized graph partitioning function. |
| * |
| * @author yingyib |
| */ |
| public class VertexPartitionComputerFactory implements ITuplePartitionComputerFactory { |
| |
| private static final long serialVersionUID = 1L; |
| private final IConfigurationFactory confFactory; |
| |
| public VertexPartitionComputerFactory(IConfigurationFactory confFactory) { |
| this.confFactory = confFactory; |
| } |
| |
| @SuppressWarnings("rawtypes") |
| public ITuplePartitionComputer createPartitioner() { |
| try { |
| final Configuration conf = confFactory.createConfiguration(); |
| return new ITuplePartitionComputer() { |
| private final ByteBufferInputStream bbis = new ByteBufferInputStream(); |
| private final DataInputStream dis = new DataInputStream(bbis); |
| private final VertexPartitioner partitioner = BspUtils.createVertexPartitioner(conf); |
| private final WritableComparable vertexId = BspUtils.createVertexIndex(conf); |
| |
| @SuppressWarnings("unchecked") |
| public int partition(IFrameTupleAccessor accessor, int tIndex, int nParts) throws HyracksDataException { |
| try { |
| int keyStart = accessor.getTupleStartOffset(tIndex) + accessor.getFieldSlotsLength() |
| + accessor.getFieldStartOffset(tIndex, 0); |
| bbis.setByteBuffer(accessor.getBuffer(), keyStart); |
| vertexId.readFields(dis); |
| return Math.abs(partitioner.getPartitionId(vertexId, nParts) % nParts); |
| } catch (Exception e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| }; |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |