Spring Cloud Task 高级特性Task Events示例
2023-06-13 09:18:39 时间
首先,定义一个简单的Spring Boot应用程序,并添加Spring Cloud Task的依赖:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-task</artifactId>
<version>3.1.3</version>
</dependency>
然后,创建一个CommandLineRunner接口的实现,用于模拟一个长时间运行的任务:
@Component
public class LongRunningTask implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
Thread.sleep(5000);
}
}
接下来,创建一个TaskEventListener的实现,用于记录任务执行相关的事件:
@Component
public class CustomTaskEventListener implements TaskEventListener {
private final Logger logger = LoggerFactory.getLogger(CustomTaskEventListener.class);
@Override
public void onTaskStartup(TaskExecution taskExecution) {
logger.info("Task startup event received for task id: {}", taskExecution.getExecutionId());
}
@Override
public void onTaskSuccess(TaskExecution taskExecution) {
logger.info("Task success event received for task id: {}", taskExecution.getExecutionId());
}
@Override
public void onTaskFailed(TaskExecution taskExecution, Throwable throwable) {
logger.info("Task failed event received for task id: {}", taskExecution.getExecutionId());
}
@Override
public void onTaskEnd(TaskExecution taskExecution) {
logger.info("Task end event received for task id: {}", taskExecution.getExecutionId());
}
@Override
public void onTaskEndFailed(TaskExecution taskExecution, Throwable throwable) {
logger.info("Task end failed event received for task id: {}", taskExecution.getExecutionId());
}
}
最后,创建一个TaskEventPublisher的实现,用于在任务执行结束后发送一封电子邮件:
@Component
public class EmailTaskEventPublisher {
private final JavaMailSender mailSender;
public EmailTaskEventPublisher(JavaMailSender mailSender) {
this.mailSender = mailSender;
}
@EventListener
public void handleTaskSuccessEvent(TaskExecutionEvent event) {
if (event.getTaskExecution().getExitCode() == 0) {
SimpleMailMessage message = new SimpleMailMessage();
message.setTo("example@example.com");
message.setSubject("Task execution completed successfully");
message.setText("Task execution completed successfully");
mailSender.send(message);
}
}
}
在这个示例中,EmailTaskEventPublisher定义了一个handleTaskSuccessEvent方法,用于处理任务成功事件。当任务执行的退出代码为0时,它将发送一封包含任务执行结果的电子邮件。
现在,可以启动这个应用程序,并运行任务。在任务执行期间,可以在控制台输出中看到任务执行事件的记录。当任务执行结束后,将发送一封电子邮件。
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