Spring Boot教程(十)异步方法测试
测试
测试代码如下:
@Component public class AppRunner implements CommandLineRunner { private static final Logger logger = LoggerFactory.getLogger(AppRunner.class); private final GitHubLookupService gitHubLookupService; public AppRunner(GitHubLookupService gitHubLookupService) { this.gitHubLookupService = gitHubLookupService; } @Override public void run(String... args) throws Exception { // Start the clock long start = System.currentTimeMillis(); // Kick of multiple, asynchronous lookups Future<User> page1 = gitHubLookupService.findUser("PivotalSoftware"); Future<User> page2 = gitHubLookupService.findUser("CloudFoundry"); Future<User> page3 = gitHubLookupService.findUser("Spring-Projects"); // Wait until they are all done while (!(page1.isDone() && page2.isDone() && page3.isDone())) { Thread.sleep(10); //10-millisecond pause between each check } // Print results, including elapsed time logger.info("Elapsed time: " + (System.currentTimeMillis() - start)); logger.info("--> " + page1.get()); logger.info("--> " + page2.get()); logger.info("--> " + page3.get()); } }
启动程序,控制台会打印:
2017-04-30 13:11:10.351 INFO 1511 — [ GithubLookup-1] com.forezp.service.GitHubLookupService : Looking up PivotalSoftware 2017-04-30 13:11:10.351 INFO 1511 — [ GithubLookup-2] com.forezp.service.GitHubLookupService : Looking up CloudFoundry 2017-04-30 13:11:13.144 INFO 1511 — [ GithubLookup-2] com.forezp.service.GitHubLookupService : Looking up Spring-Projects
耗时:3908
分析:可以卡的前面2个方法分别在GithubLookup-1 和GithubLookup-2执行,第三个在GithubLookup-2执行,注意因为在配置线程池的时候最大线程为2.如果你把线程池的个数为3的时候,耗时减少。
如果去掉@Async,你会发现,执行这三个方法都在main线程中执行。耗时总结,如下:
2017-04-30 13:13:00.934 INFO 1527 — [ main] com.forezp.service.GitHubLookupService : Looking up PivotalSoftware 2017-04-30 13:13:03.571 INFO 1527 — [ main] com.forezp.service.GitHubLookupService : Looking up CloudFoundry 2017-04-30 13:13:04.865 INFO 1527 — [ main] com.forezp.service.GitHubLookupService : Looking up Spring-Projects