dubbo ReferenceCountedResource 源码
dubbo ReferenceCountedResource 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/reference/ReferenceCountedResource.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.dubbo.common.reference;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
/**
* inspired by Netty
*/
public abstract class ReferenceCountedResource implements AutoCloseable {
private static final Logger logger = LoggerFactory.getLogger(ReferenceCountedResource.class);
private static final AtomicLongFieldUpdater<ReferenceCountedResource> COUNTER_UPDATER
= AtomicLongFieldUpdater.newUpdater(ReferenceCountedResource.class, "counter");
private volatile long counter = 1;
/**
* Increments the reference count by 1.
*/
public final ReferenceCountedResource retain() {
long oldCount = COUNTER_UPDATER.getAndIncrement(this);
if (oldCount <= 0) {
COUNTER_UPDATER.getAndDecrement(this);
throw new AssertionError("This instance has been destroyed");
}
return this;
}
/**
* Decreases the reference count by 1 and calls {@link this#destroy} if the reference count reaches 0.
*/
public final boolean release() {
long remainingCount = COUNTER_UPDATER.decrementAndGet(this);
if (remainingCount == 0) {
destroy();
return true;
} else if (remainingCount <= -1) {
logger.warn("This instance has been destroyed");
return false;
} else {
return false;
}
}
/**
* Useful when used together with try-with-resources pattern
*/
@Override
public final void close() {
release();
}
/**
* This method will be invoked when counter reaches 0, override this method to destroy materials related to the specific resource.
*/
protected abstract void destroy();
}
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