hadoop TypedBytesOutputReader 源码
haddop TypedBytesOutputReader 代码
文件路径：/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/TypedBytesOutputReader.java
/**
* 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.streaming.io;
import java.io.DataInput;
import java.io.IOException;
import org.apache.hadoop.streaming.PipeMapRed;
import org.apache.hadoop.typedbytes.TypedBytesInput;
import org.apache.hadoop.typedbytes.TypedBytesWritable;
/**
* OutputReader that reads the client's output as typed bytes.
*/
public class TypedBytesOutputReader extends
OutputReader<TypedBytesWritable, TypedBytesWritable> {
private byte[] bytes;
private DataInput clientIn;
private TypedBytesWritable key;
private TypedBytesWritable value;
private TypedBytesInput in;
@Override
public void initialize(PipeMapRed pipeMapRed) throws IOException {
super.initialize(pipeMapRed);
clientIn = pipeMapRed.getClientInput();
key = new TypedBytesWritable();
value = new TypedBytesWritable();
in = new TypedBytesInput(clientIn);
}
@Override
public boolean readKeyValue() throws IOException {
bytes = in.readRaw();
if (bytes == null) {
return false;
}
key.set(bytes, 0, bytes.length);
bytes = in.readRaw();
value.set(bytes, 0, bytes.length);
return true;
}
@Override
public TypedBytesWritable getCurrentKey() throws IOException {
return key;
}
@Override
public TypedBytesWritable getCurrentValue() throws IOException {
return value;
}
@Override
public String getLastOutput() {
if (bytes != null) {
return new TypedBytesWritable(bytes).toString();
} else {
return null;
}
}
}
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