Spring Scheduled Services in multi module project

Question

I have a multi-module project which is set up like this:

commons-module
  -CommonsApp.java (Main class)
  -CommonsService.java
api-module
  -ApiApp.java (Main class)
main-moudle
  -MainApp.java (Main class)
  -MainService.java

Both CommonsService and MainService have some business logic and both have a corresponding @Scheduled annotated method to perform some batch processing.

MainService has a dependency on CommonsService and it autowires it inside main-module.

My app will run on seperate VM instances, with each module's jar running on its own instance. If I make the commons-module a dependency of main-module to autowire the beans from it, I worry that the MainApp.java will also start running the scheduled methods of commons-module(CommonsService.java).

This way there would be a huge wastage of resources as those scheduled methods will be running on both the commons-module machine and the main-module machine.

So how can I ensure that I use the CommonsService.java in main-module without letting Spring execute the @Scheduled annotated methods in it?

Answer 1

I suggest you use ShedLock
ShedLock does one and only one thing. It makes sure your scheduled tasks are executed at most once at the same time.
github link