| /** |
| * 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.hadoop.mapred.nativetask.serde; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.mapred.nativetask.Constants; |
| import org.apache.hadoop.mapred.nativetask.buffer.DataInputStream; |
| import org.apache.hadoop.mapred.nativetask.buffer.DataOutputStream; |
| import org.apache.hadoop.mapred.nativetask.util.SizedWritable; |
| |
| |
| |
| @InterfaceAudience.Private |
| public class KVSerializer<K, V> implements IKVSerializer { |
| |
| private static final Log LOG = LogFactory.getLog(KVSerializer.class); |
| |
| public static final int KV_HEAD_LENGTH = Constants.SIZEOF_KV_LENGTH; |
| |
| private final INativeSerializer<Writable> keySerializer; |
| private final INativeSerializer<Writable> valueSerializer; |
| |
| public KVSerializer(Class<K> kclass, Class<V> vclass) throws IOException { |
| |
| this.keySerializer = NativeSerialization.getInstance().getSerializer(kclass); |
| this.valueSerializer = NativeSerialization.getInstance().getSerializer(vclass); |
| } |
| |
| @Override |
| public void updateLength(SizedWritable<?> key, SizedWritable<?> value) throws IOException { |
| key.length = keySerializer.getLength(key.v); |
| value.length = valueSerializer.getLength(value.v); |
| return; |
| } |
| |
| @Override |
| public int serializeKV(DataOutputStream out, SizedWritable<?> key, SizedWritable<?> value) |
| throws IOException { |
| return serializePartitionKV(out, -1, key, value); |
| } |
| |
| @Override |
| public int serializePartitionKV(DataOutputStream out, int partitionId, |
| SizedWritable<?> key, SizedWritable<?> value) |
| throws IOException { |
| |
| if (key.length == SizedWritable.INVALID_LENGTH || |
| value.length == SizedWritable.INVALID_LENGTH) { |
| updateLength(key, value); |
| } |
| |
| final int keyLength = key.length; |
| final int valueLength = value.length; |
| |
| int bytesWritten = KV_HEAD_LENGTH + keyLength + valueLength; |
| if (partitionId != -1) { |
| bytesWritten += Constants.SIZEOF_PARTITION_LENGTH; |
| } |
| |
| if (out.hasUnFlushedData() && out.shortOfSpace(bytesWritten)) { |
| out.flush(); |
| } |
| |
| if (partitionId != -1) { |
| out.writeInt(partitionId); |
| } |
| |
| out.writeInt(keyLength); |
| out.writeInt(valueLength); |
| |
| keySerializer.serialize(key.v, out); |
| valueSerializer.serialize(value.v, out); |
| |
| return bytesWritten; |
| } |
| |
| @Override |
| public int deserializeKV(DataInputStream in, SizedWritable<?> key, |
| SizedWritable<?> value) throws IOException { |
| |
| if (!in.hasUnReadData()) { |
| return 0; |
| } |
| |
| key.length = in.readInt(); |
| value.length = in.readInt(); |
| |
| keySerializer.deserialize(in, key.length, key.v); |
| valueSerializer.deserialize(in, value.length, value.v); |
| |
| return key.length + value.length + KV_HEAD_LENGTH; |
| } |
| |
| } |