org.elasticsearch.index.translog.fs.RafReference Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.index.translog.fs;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.util.concurrent.atomic.AtomicInteger;
/**
*
*/
public class RafReference {
private final File file;
private final RandomAccessFile raf;
private final FileChannel channel;
private final AtomicInteger refCount = new AtomicInteger();
public RafReference(File file) throws FileNotFoundException {
this.file = file;
this.raf = new RandomAccessFile(file, "rw");
this.channel = raf.getChannel();
this.refCount.incrementAndGet();
}
public File file() {
return this.file;
}
public FileChannel channel() {
return this.channel;
}
public RandomAccessFile raf() {
return this.raf;
}
/**
* Increases the ref count, and returns true if it managed to
* actually increment it.
*/
public boolean increaseRefCount() {
return refCount.incrementAndGet() > 1;
}
public void decreaseRefCount(boolean delete) {
if (refCount.decrementAndGet() <= 0) {
try {
raf.close();
if (delete) {
file.delete();
}
} catch (IOException e) {
// ignore
}
}
}
}