hadoop SimpleBufferedOutputStream 源码
haddop SimpleBufferedOutputStream 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/SimpleBufferedOutputStream.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.io.file.tfile;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* A simplified BufferedOutputStream with borrowed buffer, and allow users to
* see how much data have been buffered.
*/
public class SimpleBufferedOutputStream extends FilterOutputStream {
protected byte buf[]; // the borrowed buffer
protected int count = 0; // bytes used in buffer.
// Constructor
public SimpleBufferedOutputStream(OutputStream out, byte[] buf) {
super(out);
this.buf = buf;
}
private void flushBuffer() throws IOException {
if (count > 0) {
out.write(buf, 0, count);
count = 0;
}
}
@Override
public void write(int b) throws IOException {
if (count >= buf.length) {
flushBuffer();
}
buf[count++] = (byte) b;
}
@Override
public void write(byte b[], int off, int len) throws IOException {
if (len >= buf.length) {
flushBuffer();
out.write(b, off, len);
return;
}
if (len > buf.length - count) {
flushBuffer();
}
System.arraycopy(b, off, buf, count, len);
count += len;
}
@Override
public synchronized void flush() throws IOException {
flushBuffer();
out.flush();
}
// Get the size of internal buffer being used.
public int size() {
return count;
}
}
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