多线程 ThreadPoolTaskExecutor 应用
1.如何判断线程池所有任务是否执行完毕
package com.vipsoft.web; import org.junit.jupiter.api.Test; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import java.io.File; import java.util.concurrent.CountDownLatch; @SpringBootTest public class ThreadTest { Logger logger = LoggerFactory.getLogger(this.getClass()); @Autowired private ThreadPoolTaskExecutor threadPoolTaskExecutor; @Test void verification() throws Exception { File f = new File("D:\\Logs\\"); CountDownLatch countDownLatch = new CountDownLatch(f.listFiles().length); for (File file : f.listFiles()) { if (file.isFile()) { String fileName = file.getName(); try { UserInfo userInfo = new UserInfo(); userInfo.getName("Name "+i); threadExecutor(countDownLatch, userInfo); logger.info("发出执行请求 => {}", fileName); } catch (Exception ex) { logger.error("异常 {}", fileName); logger.error(ex.getMessage(), ex); } } } //阻塞当前线程,直到倒数计数器倒数到0 try { logger.info("阻塞当前线程,直到倒数计数器倒数到0"); countDownLatch.await(); logger.info("全部处理完成"); } catch (Exception ex) { logger.error("阻塞当前线程异常{}", ex.getMessage(), ex); } } void threadExecutor(CountDownLatch countDownLatch, UserInfo userInfo) { try { threadPoolTaskExecutor.execute(() -> { try { logger.info("线程名称{} {}", Thread.currentThread().getName(), userInfo.getName()); Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } finally { //很关键, 无论上面程序是否异常必须执行countDown,否则await无法释放 countDownLatch.countDown(); } }); } catch (Exception ex) { logger.error(ex.getMessage(), ex); } } }
本文来自博客园,作者:VipSoft 转载请注明原文链接:https://www.cnblogs.com/vipsoft/p/16256891.html
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