| /* |
| * 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 java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.giraph.factories.MessageValueFactory; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| /** |
| * Stores vertex id and message pairs in a single byte array. |
| * |
| * @param <I> Vertex id |
| * @param <M> Message data |
| */ |
| @SuppressWarnings("unchecked") |
| public class ByteArrayVertexIdMessages<I extends WritableComparable, |
| M extends Writable> extends ByteArrayVertexIdData<I, M> |
| implements VertexIdMessages<I, M> { |
| /** Message value class */ |
| private final MessageValueFactory<M> messageValueFactory; |
| /** Add the message size to the stream? (Depends on the message store) */ |
| private boolean useMessageSizeEncoding = false; |
| |
| /** |
| * Constructor |
| * |
| * @param messageValueFactory Class for messages |
| */ |
| public ByteArrayVertexIdMessages( |
| MessageValueFactory<M> messageValueFactory) { |
| this.messageValueFactory = messageValueFactory; |
| } |
| |
| /** |
| * Set whether message sizes should be encoded. This should only be a |
| * possibility when not combining. When combining, all messages need to be |
| * de-serialized right away, so this won't help. |
| */ |
| private void setUseMessageSizeEncoding() { |
| if (!getConf().useOutgoingMessageCombiner()) { |
| useMessageSizeEncoding = getConf().useMessageSizeEncoding(); |
| } else { |
| useMessageSizeEncoding = false; |
| } |
| } |
| |
| @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); |
| } |
| |
| @Override |
| public void initialize() { |
| super.initialize(); |
| setUseMessageSizeEncoding(); |
| } |
| |
| @Override |
| public void initialize(int expectedSize) { |
| super.initialize(expectedSize); |
| setUseMessageSizeEncoding(); |
| } |
| |
| @Override |
| public ByteStructVertexIdMessageIterator<I, M> getVertexIdMessageIterator() { |
| return new ByteStructVertexIdMessageIterator<>(this); |
| } |
| |
| @Override |
| public void add(I vertexId, M message) { |
| if (!useMessageSizeEncoding) { |
| super.add(vertexId, message); |
| } else { |
| try { |
| vertexId.write(extendedDataOutput); |
| writeMessageWithSize(message); |
| } catch (IOException e) { |
| throw new IllegalStateException("add: IOException occurred"); |
| } |
| } |
| } |
| |
| @Override |
| public void add(byte[] serializedId, int idPos, M message) { |
| if (!useMessageSizeEncoding) { |
| super.add(serializedId, idPos, message); |
| } else { |
| try { |
| extendedDataOutput.write(serializedId, 0, idPos); |
| writeMessageWithSize(message); |
| } catch (IOException e) { |
| throw new IllegalStateException("add: IOException occurred"); |
| } |
| } |
| } |
| |
| /** |
| * Write a size of the message and message |
| * |
| * @param message Message to write |
| */ |
| private void writeMessageWithSize(M message) throws IOException { |
| int pos = extendedDataOutput.getPos(); |
| extendedDataOutput.skipBytes(4); |
| writeData(extendedDataOutput, message); |
| extendedDataOutput.writeInt( |
| pos, extendedDataOutput.getPos() - pos - 4); |
| } |
| |
| @Override |
| public ByteStructVertexIdMessageBytesIterator<I, M> |
| getVertexIdMessageBytesIterator() { |
| if (!useMessageSizeEncoding) { |
| return null; |
| } |
| return new ByteStructVertexIdMessageBytesIterator<I, M>(this) { |
| @Override |
| public void writeCurrentMessageBytes(DataOutput dataOutput) { |
| try { |
| dataOutput.write(extendedDataOutput.getByteArray(), |
| messageOffset, messageBytes); |
| } catch (NegativeArraySizeException e) { |
| VerboseByteStructMessageWrite.handleNegativeArraySize(vertexId); |
| } catch (IOException e) { |
| throw new IllegalStateException("writeCurrentMessageBytes: Got " + |
| "IOException", e); |
| } |
| } |
| }; |
| } |
| |
| @Override |
| public void write(DataOutput dataOutput) throws IOException { |
| dataOutput.writeBoolean(useMessageSizeEncoding); |
| super.write(dataOutput); |
| } |
| |
| @Override |
| public void readFields(DataInput dataInput) throws IOException { |
| useMessageSizeEncoding = dataInput.readBoolean(); |
| super.readFields(dataInput); |
| } |
| } |