使用yaml文件中的多个cron表达式来启动一个@Scheduled任务
我喜欢@Scheduled
使用.yml
文件的不同配置属性来实现一项作业。
在我的yaml文件中,我将其描述cron expression
为列表:
job: schedules:
- 10 * * * * *
- 20 * * * * *
我使用Configuration读取了这些值,并创建了一个@Bean
named scheduled
:
@Configuration@ConfigurationProperties(prefix="job", locations = "classpath:cronjob.yml")
public class CronConfig {
private List<String> schedules;
@Bean
public List<String> schedules() {
return this.schedules;
}
public List<String> getSchedules() {
return schedules;
}
public void setSchedules(List<String> schedules) {
this.schedules = schedules;
}
}
在我的Job类中,我想开始执行一种方法,但是要执行配置中的两个计划。
@Scheduled(cron = "#{@schedules}") public String execute() {
System.out.println(converterService.test());
return "success";
}
使用此解决方案,应用程序将创建错误:(或多或少清晰)
Encountered invalid @Scheduled method 'execute': Cron expression must consist of 6 fields (found 12 in "[10 * * * * *, 20 * * * * *]")
经过一番尝试后,我只是在executer方法上使用了第二个注释。
@Scheduled(cron = "#{@schedules[0]}")@Scheduled(cron = "#{@schedules[1]}")
public String execute() {
System.out.println(converterService.test());
return "success";
}
此解决方案有效,但并非真正动态。有没有办法使它动态?
回答:
(编辑,因为我找到了一种执行此操作的方法)
您实际上可以做到这一点。下面我展示了一个工作示例:
job: schedules:
- 10 * * * * *
- 20 * * * * *
执行 的实际任务:
package hello;import org.springframework.stereotype.Component;
@Component
public class MyTask implements Runnable {
@Override
public void run() {
//complicated stuff
}
}
您的 如下:
package hello;import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.List;
@Configuration
@ConfigurationProperties(prefix="job", locations = "classpath:cronjob.yml")
public class CronConfig {
private List<String> schedules;
@Bean
public List<String> schedules() {
return this.schedules;
}
public List<String> getSchedules() {
return schedules;
}
public void setSchedules(List<String> schedules) {
this.schedules = schedules;
}
}
该 豆,负责安排所有crons:
package hello;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;
@Component
public class ScheduledTasks {
@Autowired
private TaskScheduler taskScheduler;
@Autowired
private CronConfig cronConfig;
@Autowired
private MyTask myTask;
private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);
public void scheduleAllCrons() {
cronConfig.getSchedules().forEach( cron -> taskScheduler.schedule(myTask, new CronTrigger(cron)) );
}
}
上下文/主类 :
package hello;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ConcurrentTaskScheduler;
@SpringBootApplication
@EnableScheduling
@EnableAsync
public class Application {
@Bean
public TaskScheduler taskScheduler() {
return new ConcurrentTaskScheduler();
}
public static void main(String[] args) throws Exception {
ApplicationContext ctx = SpringApplication.run(Application.class);
ScheduledTasks scheduledTasks = ctx.getBean(ScheduledTasks.class);
scheduledTasks.scheduleAllCrons();
}
}
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