| /* |
| * 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.giraph.utils; |
| |
| import org.apache.giraph.factories.MessageValueFactory; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| import java.io.IOException; |
| |
| /** |
| * Stores a message and a list of target vertex ids. |
| * |
| * @param <I> Vertex id |
| * @param <M> Message data |
| */ |
| @SuppressWarnings("unchecked") |
| public class ByteArrayOneMessageToManyIds<I extends WritableComparable, |
| M extends Writable> extends ByteArrayVertexIdData<I, M> |
| implements VertexIdMessages<I, M> { |
| /** Message value class */ |
| private MessageValueFactory<M> messageValueFactory; |
| |
| /** |
| * Constructor. |
| * |
| * @param messageValueFactory Class for messages |
| */ |
| public ByteArrayOneMessageToManyIds( |
| MessageValueFactory<M> messageValueFactory) { |
| this.messageValueFactory = messageValueFactory; |
| } |
| |
| @Override |
| public M createData() { |
| return messageValueFactory.newInstance(); |
| } |
| |
| @Override |
| public void writeData(ExtendedDataOutput out, M message) throws IOException { |
| message.write(out); |
| } |
| |
| @Override |
| public void readData(ExtendedDataInput in, M message) throws IOException { |
| message.readFields(in); |
| } |
| |
| /** |
| * Add a message. |
| * The order is: the message > id count > ids . |
| * |
| * @param ids The byte array which holds target ids |
| * of this message on the worker |
| * @param idPos The end position of the ids |
| * information in the byte array above. |
| * @param count The number of ids |
| * @param msg The message sent |
| */ |
| public void add(byte[] ids, int idPos, int count, M msg) { |
| try { |
| msg.write(extendedDataOutput); |
| extendedDataOutput.writeInt(count); |
| extendedDataOutput.write(ids, 0, idPos); |
| } catch (IOException e) { |
| throw new IllegalStateException("add: IOException", e); |
| } |
| } |
| |
| @Override |
| public void add(I vertexId, M data) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void add(byte[] serializedId, int idPos, M data) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public VertexIdMessageBytesIterator<I, M> getVertexIdMessageBytesIterator() { |
| return null; |
| } |
| |
| @Override |
| public VertexIdMessageIterator<I, M> getVertexIdMessageIterator() { |
| return new OneMessageToManyIdsIterator<>(this); |
| } |
| } |