org.apache.hudi.org.apache.hadoop.hbase.nio.RefCnt Maven / Gradle / Ivy
/**
* 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.hbase.nio;
import org.apache.hadoop.hbase.io.ByteBuffAllocator;
import org.apache.hadoop.hbase.io.ByteBuffAllocator.Recycler;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hbase.thirdparty.io.netty.util.AbstractReferenceCounted;
import org.apache.hbase.thirdparty.io.netty.util.ReferenceCounted;
/**
* Maintain an reference count integer inside to track life cycle of {@link ByteBuff}, if the
* reference count become 0, it'll call {@link Recycler#free()} exactly once.
*/
@InterfaceAudience.Private
public class RefCnt extends AbstractReferenceCounted {
private Recycler recycler = ByteBuffAllocator.NONE;
/**
* Create an {@link RefCnt} with an initial reference count = 1. If the reference count become
* zero, the recycler will do nothing. Usually, an Heap {@link ByteBuff} will use this kind of
* refCnt to track its life cycle, it help to abstract the code path although it's not really
* needed to track on heap ByteBuff.
*/
public static RefCnt create() {
return new RefCnt(ByteBuffAllocator.NONE);
}
public static RefCnt create(Recycler recycler) {
return new RefCnt(recycler);
}
public RefCnt(Recycler recycler) {
this.recycler = recycler;
}
@Override
protected final void deallocate() {
this.recycler.free();
}
@Override
public final ReferenceCounted touch(Object hint) {
throw new UnsupportedOperationException();
}
}