hadoop RewindableInputStream 源码
haddop RewindableInputStream 代码
文件路径：/hadoop-tools/hadoop-rumen/src/main/java/org/apache/hadoop/tools/rumen/RewindableInputStream.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.tools.rumen;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* A simple wrapper class to make any input stream "rewindable". It could be
* made more memory efficient by grow the internal buffer adaptively.
*/
public class RewindableInputStream extends InputStream {
private InputStream input;
/**
* Constructor.
*
* @param input
*/
public RewindableInputStream(InputStream input) {
this(input, 1024 * 1024);
}
/**
* Constructor
*
* @param input
* input stream.
* @param maxBytesToRemember
* Maximum number of bytes we need to remember at the beginning of
* the stream. If {@link #rewind()} is called after so many bytes are
* read from the stream, {@link #rewind()} would fail.
*/
public RewindableInputStream(InputStream input, int maxBytesToRemember) {
this.input = new BufferedInputStream(input, maxBytesToRemember);
this.input.mark(maxBytesToRemember);
}
@Override
public int read() throws IOException {
return input.read();
}
@Override
public int read(byte[] buffer, int offset, int length) throws IOException {
return input.read(buffer, offset, length);
}
@Override
public void close() throws IOException {
input.close();
}
public InputStream rewind() throws IOException {
try {
input.reset();
return this;
} catch (IOException e) {
throw new IOException("Unable to rewind the stream", e);
}
}
}
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