| /* |
| * 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.jclouds.concurrent; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Factory and utility methods for handling {@link DynamicThreadPoolExecutor}. |
| */ |
| public class DynamicExecutors { |
| |
| /** |
| * Creates a thread pool, same as in {@link #newScalingThreadPool(int, int, long)}, using the provided ThreadFactory |
| * to create new threads when needed. |
| * |
| * @param min |
| * the number of threads to keep in the pool, even if they are idle. |
| * @param max |
| * the maximum number of threads to allow in the pool. |
| * @param keepAliveTime |
| * when the number of threads is greater than the min, this is the maximum time that excess idle threads |
| * will wait for new tasks before terminating (in milliseconds). |
| * @param threadFactory |
| * the factory to use when creating new threads. |
| * @return the newly created thread pool |
| */ |
| public static ExecutorService newScalingThreadPool(int min, int max, long keepAliveTime, ThreadFactory threadFactory) { |
| DynamicThreadPoolExecutor.DynamicQueue<Runnable> queue = new DynamicThreadPoolExecutor.DynamicQueue<Runnable>(); |
| ThreadPoolExecutor executor = new DynamicThreadPoolExecutor(min, max, keepAliveTime, |
| TimeUnit.MILLISECONDS, queue, threadFactory); |
| executor.setRejectedExecutionHandler(new DynamicThreadPoolExecutor.ForceQueuePolicy()); |
| queue.setThreadPoolExecutor(executor); |
| return executor; |
| } |
| |
| /** |
| * Cannot instantiate. |
| */ |
| private DynamicExecutors() { |
| } |
| } |