| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 at |
| * |
| * 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 org.apache.tinkerpop.gremlin.giraph.process.computer; |
| |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.giraph.conf.ImmutableClassesGiraphConfigurable; |
| import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.HadoopGraph; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.io.ObjectWritable; |
| import org.apache.tinkerpop.gremlin.hadoop.structure.util.ConfUtil; |
| import org.apache.tinkerpop.gremlin.process.computer.MessageCombiner; |
| import org.apache.tinkerpop.gremlin.process.computer.VertexProgram; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class GiraphMessageCombiner extends org.apache.giraph.combiner.MessageCombiner<ObjectWritable, ObjectWritable> implements ImmutableClassesGiraphConfigurable { |
| |
| private MessageCombiner messageCombiner; |
| private ImmutableClassesGiraphConfiguration configuration; |
| |
| @Override |
| public void combine(final ObjectWritable vertexIndex, final ObjectWritable originalMessage, final ObjectWritable messageToCombine) { |
| originalMessage.set(originalMessage.isEmpty() ? |
| messageToCombine.get() : |
| this.messageCombiner.combine(originalMessage.get(), messageToCombine.get())); |
| } |
| |
| @Override |
| public ObjectWritable createInitialMessage() { |
| return ObjectWritable.empty(); |
| } |
| |
| @Override |
| public void setConf(final ImmutableClassesGiraphConfiguration configuration) { |
| this.configuration = configuration; |
| final Configuration apacheConfiguration = ConfUtil.makeApacheConfiguration(configuration); |
| this.messageCombiner = (MessageCombiner) VertexProgram.createVertexProgram(HadoopGraph.open(apacheConfiguration), apacheConfiguration).getMessageCombiner().get(); |
| } |
| |
| @Override |
| public ImmutableClassesGiraphConfiguration getConf() { |
| return this.configuration; |
| } |
| } |