How to Dynamically Schedule Jobs with a Fixed Rate in Spring?-javaTutorial-php.cn

How to Dynamically Schedule Jobs with a Fixed Rate in Spring?

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Release： 2024-11-27 20:21:11

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How to Dynamically Schedule Jobs with a Fixed Rate in Spring?

How to Schedule a Job with Spring Programmatically with Dynamically Set Fixed Rate

In Spring, tasks can be scheduled using annotations like @Scheduled. However, if the fixed rate needs to be changed dynamically without redeploying the application, a different approach is required.

One solution is to use a Trigger. With a trigger, you can calculate the next execution time on the fly based on a custom logic.

Here's an example of how to configure a trigger-based job using the ScheduledTaskRegistrar:

@Configuration
@EnableScheduling
public class MyAppConfig implements SchedulingConfigurer {

    @Autowired
    Environment env;

    @Bean
    public MyBean myBean() {
        return new MyBean();
    }

    @Bean(destroyMethod = "shutdown")
    public Executor taskExecutor() {
        return Executors.newScheduledThreadPool(100);
    }

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        taskRegistrar.setScheduler(taskExecutor());
        taskRegistrar.addTriggerTask(
                new Runnable() {
                    @Override public void run() {
                        myBean().getSchedule();
                    }
                },
                new Trigger() {
                    @Override public Date nextExecutionTime(TriggerContext triggerContext) {
                        Calendar nextExecutionTime =  new GregorianCalendar();
                        Date lastActualExecutionTime = triggerContext.lastActualExecutionTime();
                        nextExecutionTime.setTime(lastActualExecutionTime != null ? lastActualExecutionTime : new Date());
                        nextExecutionTime.add(Calendar.MILLISECOND, env.getProperty("myRate", Integer.class)); //Get the value dynamically
                        return nextExecutionTime.getTime();
                    }
                }
        );
    }
}

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This allows you to set the fixed rate dynamically using the Environment property. The myRate property can be retrieved from any source, such as a database or a configuration file.

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