hadoop ByteBufferWrapper 源码
haddop ByteBufferWrapper 代码
文件路径：/hadoop-cloud-storage-project/hadoop-cos/src/main/java/org/apache/hadoop/fs/cosn/ByteBufferWrapper.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.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.util.CleanerUtil;
/**
* The wrapper for memory buffers and disk buffers.
*/
public class ByteBufferWrapper {
private static final Logger LOG =
LoggerFactory.getLogger(ByteBufferWrapper.class);
private ByteBuffer byteBuffer;
private File file;
private RandomAccessFile randomAccessFile;
ByteBufferWrapper(ByteBuffer byteBuffer) {
this(byteBuffer, null, null);
}
ByteBufferWrapper(ByteBuffer byteBuffer, RandomAccessFile randomAccessFile,
File file) {
this.byteBuffer = byteBuffer;
this.file = file;
this.randomAccessFile = randomAccessFile;
}
public ByteBuffer getByteBuffer() {
return this.byteBuffer;
}
boolean isDiskBuffer() {
return this.file != null && this.randomAccessFile != null;
}
private void munmap(MappedByteBuffer buffer) {
if (CleanerUtil.UNMAP_SUPPORTED) {
try {
CleanerUtil.getCleaner().freeBuffer(buffer);
} catch (IOException e) {
LOG.warn("Failed to unmap the buffer", e);
}
} else {
LOG.trace(CleanerUtil.UNMAP_NOT_SUPPORTED_REASON);
}
}
void close() throws IOException {
if (null != this.byteBuffer) {
this.byteBuffer.clear();
}
IOException exception = null;
// catch all exceptions, and try to free up resources that can be freed.
try {
if (null != randomAccessFile) {
this.randomAccessFile.close();
}
} catch (IOException e) {
LOG.error("Close the random access file occurs an exception.", e);
exception = e;
}
if (this.byteBuffer instanceof MappedByteBuffer) {
munmap((MappedByteBuffer) this.byteBuffer);
}
if (null != this.file && this.file.exists()) {
if (!this.file.delete()) {
LOG.warn("Delete the tmp file: [{}] failed.",
this.file.getAbsolutePath());
}
}
if (null != exception) {
throw exception;
}
}
}
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