线程池的使用

原创已于 2023-06-30 21:59:05 修改 · 96 阅读

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于 2023-06-28 21:34:45 首次发布

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该代码示例展示了如何使用Java的enum实现线程池（ThreadPoolExecutor）的单例模式。线程池配置包括核心线程数、最大线程数、空闲线程存活时间以及拒绝策略。线程工厂用于定制线程名称。


import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author x1ao4i
 * 本类采用单例模式创建线程池执行器
 */
public class ThreadPoolSingleton {

	enum ThreadPoolEnum {
		THREAD_POOL_SINGLETON;
		
		private ThreadPoolExecutor threadPoolExecutor;
		
		private ThreadPoolEnum() {
			
			ThreadFactory threadFactory = new ThreadFactory() {
				AtomicInteger threadNum = new AtomicInteger(0);
				@Override
				public Thread newThread(Runnable r) {
					// TODO Auto-generated method stub
					return new Thread(r, "custom-thread-pool-" + threadNum.incrementAndGet());
				}
			};
			
			ArrayBlockingQueue<Runnable> arrayBlockingQueue = new ArrayBlockingQueue<Runnable>(50);
			
			// 参数分别是 核心线程数、最大线程数、最大空闲时间、空闲时间单位、队列、线程工厂、拒绝策略
			threadPoolExecutor = new ThreadPoolExecutor(10, 20, 10, TimeUnit.SECONDS, 
					arrayBlockingQueue, threadFactory, new ThreadPoolExecutor.CallerRunsPolicy());
		}
		
		public ThreadPoolExecutor generateThreadPool() {
			return threadPoolExecutor;
		}
	}
	
	public static ThreadPoolExecutor generateThreadPool() {
		return ThreadPoolEnum.THREAD_POOL_SINGLETON.generateThreadPool();
	}
}