Execute Daemon Module After Specific Daemon Module

Experience Manager (PaaS/OnPrem)
1

Hi Team,

I want to execute custom daemon module after specific daemon module. If it is possible, please suggest the solution. Thanks in advance…

Thanks,
Harin Delli

2

Hi Harin,

To execute com.example.repository.SecondDaemonModule after com.example.repository.FirstDaemonModule, I think you can try to put @org.onehippo.repository.modules.After annotation onto the SecondDaemonModule class:

@After(modules= { FirstDaemonModule.class })
public class SecondDaemonModule ...{

Regards,

Woonsan

3

Hi Woonsan,

Thanks for quick response…
I have tried RequiresService also. I tried to access the service {HippoServiceRegistry.register(service, FirstDaemonModuleService.class);} defined on FirstDaemonModule to SecondDaemonModule. I am not able to use service which one is showing “null”. Any restriction is there like “We cannot access service on DaemonModule”.

Thanks,
Harin Delli

4

Did you add ProvidesService annotation in the FirstDaemonModule with the FirstDaemonModuleService.class, and RequiresService with FirstDaemonModuleService.class in the SecondDaemonModule?

5

Yes. I added ProvidesService annotation in the FirstDaemonModule with the FirstDaemonModuleService.class , and RequiresService with FirstDaemonModuleService.class in the SecondDaemonModule. After adding like this “I have observed one thing. SecondDaemonModule is executing before FirstDaemonModule”.

May i know the execution flow of DaemonModules like alphabetic order?

Note:: ProvidesService on FirstDaemonModule, RequiresService on SecondDaemonModule…

6

It seems like module executions (i.e, invoking #initialize()) is done in ModuleManager#startModules() [1], which expects a sorted module list from ModuleRegistry#getModuleRegistrations() [2].
I don’t think @RequireServices and @ProvideServices affects the execution ordering. Instead only @After annotation seems to have a real impact.
Is your trial with @After not working?

Woonsan

[1] https://code.onehippo.org/cms-community/hippo-repository/blob/hippo-repository-14.1.0/engine/src/main/java/org/onehippo/repository/modules/ModuleManager.java#L123-127
[2] https://code.onehippo.org/cms-community/hippo-repository/blob/hippo-repository-14.1.0/engine/src/main/java/org/onehippo/repository/modules/ModuleRegistry.java#L53-110

7

Thanks Woonsan. This information helped to me…