Scheduled线程-schedule
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schedule
1.schedule方法
schedule方法主要使用延迟或者定时执行一次,在指定时间之后。
在延迟两秒后提交任务,开始任务的执行
package com.cweeyii.threadpool;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.util.ArrayList;import java.util.List;import java.util.concurrent.*;/** * Created by wenyi on 16/10/16. * Email:caowenyi@meituan.com */public class ScheduledThreadPool { private static final Logger LOGGER = LoggerFactory.getLogger(ScheduledThreadPool.class); public static void main(String[] args) throws ExecutionException, InterruptedException { testScheduledMethod(); testFixScheduledMethod(); testFixWithScheduledMethod(); } private static void testScheduledMethod() throws ExecutionException, InterruptedException { int poolSize = 2; ScheduledExecutorService executorService = Executors.newScheduledThreadPool(poolSize); List<Future<CallerHandle>> futureList = new ArrayList<>(); for (int i = 0; i < poolSize * 2; i++) { futureList.add(executorService.schedule(new CallableWorker(), 2, TimeUnit.SECONDS)); } executorService.shutdown(); LOGGER.info("线程池已经被关闭"); for (Future<CallerHandle> future : futureList) { CallerHandle handle = future.get(); LOGGER.info(handle.getThreadName() + "已经完成"); } LOGGER.info("主线程结束"); } private static void testFixScheduledMethod() throws ExecutionException, InterruptedException { int poolSize = 2; ScheduledExecutorService executorService = Executors.newScheduledThreadPool(poolSize); for (int i = 0; i < poolSize * 2; i++) { executorService.scheduleAtFixedRate(new RunableWorker(), 0, 5, TimeUnit.SECONDS); } executorService.awaitTermination(10, TimeUnit.SECONDS); executorService.shutdown(); LOGGER.info("线程池已经被关闭"); LOGGER.info("主线程结束"); } private static void testFixWithScheduledMethod() throws ExecutionException, InterruptedException { int poolSize = 2; ScheduledExecutorService executorService = Executors.newScheduledThreadPool(poolSize); for (int i = 0; i < poolSize * 2; i++) { executorService.scheduleWithFixedDelay(new RunableWorker(), 0, 5, TimeUnit.SECONDS); } executorService.awaitTermination(10, TimeUnit.SECONDS); executorService.shutdown(); LOGGER.info("线程池已经被关闭"); LOGGER.info("主线程结束"); }}
testScheduledMethod结果如下:
22:04:41.017 INFO (ScheduledThreadPool.java:29) - 线程池已经被关闭22:04:45.023 INFO (CallableWorker.java:20) - pool-1-thread-1 结束任务22:04:45.024 INFO (CallableWorker.java:20) - pool-1-thread-2 结束任务22:04:45.026 INFO (ScheduledThreadPool.java:32) - pool-1-thread-1已经完成22:04:45.027 INFO (ScheduledThreadPool.java:32) - pool-1-thread-2已经完成22:04:47.029 INFO (CallableWorker.java:20) - pool-1-thread-1 结束任务22:04:47.029 INFO (CallableWorker.java:20) - pool-1-thread-2 结束任务22:04:47.029 INFO (ScheduledThreadPool.java:32) - pool-1-thread-1已经完成22:04:47.030 INFO (ScheduledThreadPool.java:32) - pool-1-thread-2已经完成22:04:47.030 INFO (ScheduledThreadPool.java:34) - 主线程结束
注意:scheduleAtFixedRate只会同时调度指定线程数量的任务,其他的任务执行时间会延后,但是其调度延迟时间是按照任务执行开始时间进行计算。
testFixScheduledMethod执行结果如下:
22:46:37.313 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:46:37.313 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:46:39.318 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:46:39.324 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:46:42.316 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:46:42.316 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:46:44.321 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:46:44.321 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:46:45.311 INFO (ScheduledThreadPool.java:47) - 线程池已经被关闭22:46:45.312 INFO (ScheduledThreadPool.java:48) - 主线程结束22:46:47.314 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成
注意:scheduleWithFixedDelay只会同时调度指定线程数量的任务,其他的任务执行时间会延后,但是其调度延迟时间是按照任务结束时间进行计算。
testFixWithScheduledMethod执行如下:
22:49:50.897 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:49:50.897 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:49:52.906 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:49:52.906 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:49:57.907 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成22:49:57.907 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:49:58.895 INFO (ScheduledThreadPool.java:59) - 线程池已经被关闭22:49:58.896 INFO (ScheduledThreadPool.java:60) - 主线程结束22:49:59.911 INFO (RunableWorker.java:27) - pool-1-thread-2 线程处理提交任务完成22:49:59.911 INFO (RunableWorker.java:27) - pool-1-thread-1 线程处理提交任务完成
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