Java Spring Boot中的多线程cron作业
我正在开发一个Spring Boot应用程序,它在给定的网站中查找给定的Java Spring Boot中的多线程cron作业,java,multithreading,spring-boot,cron,Java,Multithreading,Spring Boot,Cron,我正在开发一个Spring Boot应用程序,它在给定的网站中查找给定的关键字,如果找到匹配项,就会删除网页。我正在编写一个cron作业,每5分钟刷新一次结果,如下所示: @Scheduled(cron = "* */5 * * * *") public void fetchLatestResults() throws Exception { LOG.debug("Fetching latest results >>>"); List<Keyword>
关键字
,如果找到匹配项,就会删除网页。我正在编写一个cron作业,每5分钟刷新一次结果,如下所示:
@Scheduled(cron = "* */5 * * * *")
public void fetchLatestResults() throws Exception {
LOG.debug("Fetching latest results >>>");
List<Keyword> keywords = keywordService.findOldestSearched10();
keywordService.updateLastSearchDate(keywords);
searchResultService.fetchLatestResults(keywords);
LOG.debug("<<< Latest results fetched");
}
@Scheduled(cron=“***/5****”)
public void fetchLatestResults()引发异常{
LOG.debug(“获取最新结果>>”;
List keywords=keywordService.findOldestSearched10();
关键字服务.updateLastSearchDate(关键字);
searchResultService.fetchLatestResults(关键字);
debug(“我建议您使cron作业的执行异步化
创建将创建新线程以运行cron作业的executor
类:
@Component
public class YourCronJobExecutor {
private int threadsNumber = 10;
private ExecutorService executorService;
@PostConstruct
private void init() {
executorService = Executors.newFixedThreadPool(threadsNumber);
}
/**
* Start.
* @param runnable - runnable instance.
*/
public void start(Runnable runnable) {
try {
executorService.execute(runnable);
} catch (RejectedExecutionException e) {
init();
executorService.execute(runnable);
}
}
}
@Component
public class CronJobProcessor {
//logger
//autowired beans
public void executeYouCronJob() {
LOG.debug("Fetching latest results >>>");
List<Keyword> keywords = keywordService.findOldestSearched10();
keywordService.updateLastSearchDate(keywords);
searchResultService.fetchLatestResults(keywords);
LOG.debug("<<< Latest results fetched");
}
}
创建一个处理器
类,该类将包含cron作业的逻辑:
@Component
public class YourCronJobExecutor {
private int threadsNumber = 10;
private ExecutorService executorService;
@PostConstruct
private void init() {
executorService = Executors.newFixedThreadPool(threadsNumber);
}
/**
* Start.
* @param runnable - runnable instance.
*/
public void start(Runnable runnable) {
try {
executorService.execute(runnable);
} catch (RejectedExecutionException e) {
init();
executorService.execute(runnable);
}
}
}
@Component
public class CronJobProcessor {
//logger
//autowired beans
public void executeYouCronJob() {
LOG.debug("Fetching latest results >>>");
List<Keyword> keywords = keywordService.findOldestSearched10();
keywordService.updateLastSearchDate(keywords);
searchResultService.fetchLatestResults(keywords);
LOG.debug("<<< Latest results fetched");
}
}
这样,cron作业的执行将需要几毫秒的时间,一个单独的线程将实际执行该作业,它将根据需要运行多长时间
但是,您可能希望在一个单独的线程中执行每个关键字的搜索,但情况有点不同。这非常有效,并提高了性能。谢谢。