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RefreshScoped Scheduled Bean

Have a look at https://github.com/winster/embedconfigserver to see an example for Refresh feature with Spring Boot & Actuator

Points to note

I started with ScheduledRegistrar and it seems to work But I used the approach to cancel existing scheduledtask and recreate on refresh event It could pose a threat of interrupting the active threads

How to Test

  1. scheduledtask.properties has a property scheduled.fixedratedelay=5000
  2. Run application and watch logs in MyJob
  3. Now change scheduledtask.properties as follows scheduled.fixedratedelay=1000
  4. Now curl curl -X POST http://localhost:8080/actuator/refresh will give ["scheduled.fixedratedelay"]
  5. Watch logs again
  6. You can observer something similar as follows
2020-05-12 12:47:40.966  INFO 15480 --- [           main] s.a.ScheduledAnnotationBeanPostProcessor : No TaskScheduler/ScheduledExecutorService bean found for scheduled processing
2020-05-12 12:47:40.990  INFO 15480 --- [         task-1] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-1 2020-05-12T12:47:40.989
2020-05-12 12:47:41.006  INFO 15480 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2020-05-12 12:47:42.533  INFO 15480 --- [           main] c.w.s.s.ScheduledtaskApplication         : Started ScheduledtaskApplication in 11.702 seconds (JVM running for 13.926)
2020-05-12 12:47:43.182  INFO 15480 --- [)-172.19.155.94] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-05-12 12:47:43.182  INFO 15480 --- [)-172.19.155.94] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2020-05-12 12:47:43.194  INFO 15480 --- [)-172.19.155.94] o.s.web.servlet.DispatcherServlet        : Completed initialization in 12 ms
2020-05-12 12:47:45.972  INFO 15480 --- [         task-3] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-3 2020-05-12T12:47:45.972
2020-05-12 12:47:50.970  INFO 15480 --- [         task-5] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-5 2020-05-12T12:47:50.970
2020-05-12 12:47:51.000  INFO 15480 --- [         task-1] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-1 2020-05-12T12:47:50.991
2020-05-12 12:47:55.971  INFO 15480 --- [         task-7] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-7 2020-05-12T12:47:55.971
2020-05-12 12:47:55.973  INFO 15480 --- [         task-3] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-3 2020-05-12T12:47:55.973
2020-05-12 12:48:00.971  INFO 15480 --- [         task-5] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-5 2020-05-12T12:48:00.971
2020-05-12 12:48:00.972  INFO 15480 --- [         task-9] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-9 2020-05-12T12:48:00.972
2020-05-12 12:48:05.971  INFO 15480 --- [        task-11] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-11 2020-05-12T12:48:05.970
2020-05-12 12:48:05.973  INFO 15480 --- [         task-7] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-7 2020-05-12T12:48:05.973
2020-05-12 12:48:10.971  INFO 15480 --- [        task-13] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-13 2020-05-12T12:48:10.971
2020-05-12 12:48:10.973  INFO 15480 --- [         task-9] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-9 2020-05-12T12:48:10.973
2020-05-12 12:48:15.970  INFO 15480 --- [        task-15] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-15 2020-05-12T12:48:15.970
2020-05-12 12:48:15.971  INFO 15480 --- [        task-11] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-11 2020-05-12T12:48:15.971
2020-05-12 12:48:20.971  INFO 15480 --- [        task-13] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-13 2020-05-12T12:48:20.971
2020-05-12 12:48:20.971  INFO 15480 --- [        task-17] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-17 2020-05-12T12:48:20.971
2020-05-12 12:48:25.970  INFO 15480 --- [        task-19] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-19 2020-05-12T12:48:25.970
2020-05-12 12:48:25.974  INFO 15480 --- [        task-15] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-15 2020-05-12T12:48:25.974
2020-05-12 12:48:30.243  WARN 15480 --- [nio-8080-exec-1] .c.s.e.MultipleJGitEnvironmentRepository : Could not merge remote for master remote: null
2020-05-12 12:48:30.970  INFO 15480 --- [         task-1] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-1 2020-05-12T12:48:30.970
2020-05-12 12:48:30.972  INFO 15480 --- [        task-17] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-17 2020-05-12T12:48:30.972
2020-05-12 12:48:31.029  INFO 15480 --- [nio-8080-exec-1] o.s.c.c.s.e.NativeEnvironmentRepository  : Adding property source: file:/C:/Users/wjose/workspace/testgit/scheduledtask.properties
2020-05-12 12:48:31.029  INFO 15480 --- [nio-8080-exec-1] b.c.PropertySourceBootstrapConfiguration : Located property source: [BootstrapPropertySource {name='bootstrapProperties-file:///C:/Users/wjose/workspace/testgit/scheduledtask.properties'}]
2020-05-12 12:48:31.039  INFO 15480 --- [nio-8080-exec-1] o.s.boot.SpringApplication               : No active profile set, falling back to default profiles: default
2020-05-12 12:48:31.044  INFO 15480 --- [nio-8080-exec-1] o.s.boot.SpringApplication               : Started application in 2.578 seconds (JVM running for 62.437)
2020-05-12 12:48:31.146  INFO 15480 --- [         task-5] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-5 2020-05-12T12:48:31.146
2020-05-12 12:48:32.147  INFO 15480 --- [         task-2] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-2 2020-05-12T12:48:32.147
2020-05-12 12:48:33.146  INFO 15480 --- [         task-4] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-4 2020-05-12T12:48:33.146
2020-05-12 12:48:34.146  INFO 15480 --- [         task-7] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-7 2020-05-12T12:48:34.146
2020-05-12 12:48:35.147  INFO 15480 --- [         task-6] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-6 2020-05-12T12:48:35.147
2020-05-12 12:48:35.970  INFO 15480 --- [         task-9] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-9 2020-05-12T12:48:35.970
2020-05-12 12:48:35.974  INFO 15480 --- [        task-19] c.w.s.scheduledtask.scheduler.MyJob      : received a response something task-19 2020-05-12T12:48:35.974
2020-05-12 12:48:36.146  INFO 15480 --- [         task-8] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-8 2020-05-12T12:48:36.146
2020-05-12 12:48:37.147  INFO 15480 --- [        task-13] c.w.s.scheduledtask.scheduler.MyJob      : insider processAnother task-13 2020-05-12T12:48:37.147

Interesting thing to note is received a response something task-19 2020-05-12T12:48:35.974 which was scheduled before refresh event and continue to process and gracefully complete after refresh event.

Precautions

  1. If you use Async annotation within Scheduling Configuration, there is chance that previous task continue to run after Refresh event. So move the Async to a service method.

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