hadoop ReadBuffer 源码
haddop ReadBuffer 代码
文件路径：/hadoop-tools/hadoop-aliyun/src/main/java/org/apache/hadoop/fs/aliyun/oss/ReadBuffer.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.fs.aliyun.oss;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
/**
* This class is used by {@link AliyunOSSInputStream}
* and {@link AliyunOSSFileReaderTask} to buffer data that read from oss.
*/
public class ReadBuffer {
enum STATUS {
INIT, SUCCESS, ERROR
}
private final ReentrantLock lock = new ReentrantLock();
private Condition readyCondition = lock.newCondition();
private byte[] buffer;
private STATUS status;
private long byteStart;
private long byteEnd;
public ReadBuffer(long byteStart, long byteEnd) {
this.buffer = new byte[(int)(byteEnd - byteStart) + 1];
this.status = STATUS.INIT;
this.byteStart = byteStart;
this.byteEnd = byteEnd;
}
public void lock() {
lock.lock();
}
public void unlock() {
lock.unlock();
}
public void await(STATUS waitStatus) throws InterruptedException {
while (this.status == waitStatus) {
readyCondition.await();
}
}
public void signalAll() {
readyCondition.signalAll();
}
public byte[] getBuffer() {
return buffer;
}
public STATUS getStatus() {
return status;
}
public void setStatus(STATUS status) {
this.status = status;
}
public long getByteStart() {
return byteStart;
}
public long getByteEnd() {
return byteEnd;
}
}
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