hadoop ResponseBuffer 源码
haddop ResponseBuffer 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/ResponseBuffer.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.ipc;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import org.apache.hadoop.classification.InterfaceAudience;
@InterfaceAudience.Private
/** generates byte-length framed buffers. */
public class ResponseBuffer extends DataOutputStream {
public ResponseBuffer() {
this(1024);
}
public ResponseBuffer(int capacity) {
super(new FramedBuffer(capacity));
}
// update framing bytes based on bytes written to stream.
private FramedBuffer getFramedBuffer() {
FramedBuffer buf = (FramedBuffer)out;
buf.setSize(written);
return buf;
}
public void writeTo(OutputStream out) throws IOException {
getFramedBuffer().writeTo(out);
}
byte[] toByteArray() {
return getFramedBuffer().toByteArray();
}
int capacity() {
return ((FramedBuffer)out).capacity();
}
void setCapacity(int capacity) {
((FramedBuffer)out).setCapacity(capacity);
}
void ensureCapacity(int capacity) {
if (((FramedBuffer)out).capacity() < capacity) {
((FramedBuffer)out).setCapacity(capacity);
}
}
ResponseBuffer reset() {
written = 0;
((FramedBuffer)out).reset();
return this;
}
private static class FramedBuffer extends ByteArrayOutputStream {
private static final int FRAMING_BYTES = 4;
FramedBuffer(int capacity) {
super(capacity + FRAMING_BYTES);
reset();
}
@Override
public int size() {
return count - FRAMING_BYTES;
}
void setSize(int size) {
buf[0] = (byte)((size >>> 24) & 0xFF);
buf[1] = (byte)((size >>> 16) & 0xFF);
buf[2] = (byte)((size >>> 8) & 0xFF);
buf[3] = (byte)((size >>> 0) & 0xFF);
}
int capacity() {
return buf.length - FRAMING_BYTES;
}
void setCapacity(int capacity) {
buf = Arrays.copyOf(buf, capacity + FRAMING_BYTES);
}
@Override
public void reset() {
count = FRAMING_BYTES;
setSize(0);
}
};
}
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