hadoop ByteBufferInputStream 源码
haddop ByteBufferInputStream 代码
文件路径：/hadoop-cloud-storage-project/hadoop-cos/src/main/java/org/apache/hadoop/fs/cosn/ByteBufferInputStream.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.fs.cosn;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.InvalidMarkException;
/**
* The input stream class is used for buffered files.
* The purpose of providing this class is to optimize buffer read performance.
*/
public class ByteBufferInputStream extends InputStream {
private ByteBuffer byteBuffer;
private boolean isClosed;
public ByteBufferInputStream(ByteBuffer byteBuffer) throws IOException {
if (null == byteBuffer) {
throw new IOException("byte buffer is null");
}
this.byteBuffer = byteBuffer;
this.isClosed = false;
}
@Override
public int read() throws IOException {
if (null == this.byteBuffer) {
throw new IOException("this byte buffer for InputStream is null");
}
if (!this.byteBuffer.hasRemaining()) {
return -1;
}
return this.byteBuffer.get() & 0xFF;
}
@Override
public synchronized void mark(int readLimit) {
if (!this.markSupported()) {
return;
}
this.byteBuffer.mark();
// Parameter readLimit is ignored
}
@Override
public boolean markSupported() {
return true;
}
@Override
public synchronized void reset() throws IOException {
if (this.isClosed) {
throw new IOException("Closed in InputStream");
}
try {
this.byteBuffer.reset();
} catch (InvalidMarkException e) {
throw new IOException("Invalid mark");
}
}
@Override
public int available() {
return this.byteBuffer.remaining();
}
@Override
public void close() {
this.byteBuffer.rewind();
this.byteBuffer = null;
this.isClosed = true;
}
}
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