dubbo TaskQueue 源码
dubbo TaskQueue 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/threadpool/support/eager/TaskQueue.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.threadpool.support.eager;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
/**
* TaskQueue in the EagerThreadPoolExecutor
* It offer a task if the executor's submittedTaskCount less than currentPoolThreadSize
* or the currentPoolThreadSize more than executor's maximumPoolSize.
* That can make the executor create new worker
* when the task num is bigger than corePoolSize but less than maximumPoolSize.
*/
public class TaskQueue<R extends Runnable> extends LinkedBlockingQueue<Runnable> {
private static final long serialVersionUID = -2635853580887179627L;
private EagerThreadPoolExecutor executor;
public TaskQueue(int capacity) {
super(capacity);
}
public void setExecutor(EagerThreadPoolExecutor exec) {
executor = exec;
}
@Override
public boolean offer(Runnable runnable) {
if (executor == null) {
throw new RejectedExecutionException("The task queue does not have executor!");
}
int currentPoolThreadSize = executor.getPoolSize();
// have free worker. put task into queue to let the worker deal with task.
if (executor.getActiveCount() < currentPoolThreadSize) {
return super.offer(runnable);
}
// return false to let executor create new worker.
if (currentPoolThreadSize < executor.getMaximumPoolSize()) {
return false;
}
// currentPoolThreadSize >= max
return super.offer(runnable);
}
/**
* retry offer task
*
* @param o task
* @return offer success or not
* @throws RejectedExecutionException if executor is terminated.
*/
public boolean retryOffer(Runnable o, long timeout, TimeUnit unit) throws InterruptedException {
if (executor.isShutdown()) {
throw new RejectedExecutionException("Executor is shutdown!");
}
return super.offer(o, timeout, unit);
}
}
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