MongoDB GORM persistence events

[Jesper Zedlitz]

Hi, 

I am using a persistence event listener. It works fine with the Hibernate GORM backend. However, it does not work with the MonoDB GORM backend. Even a very simple test (with a fresh Grails 2.4.3 application) fails. My BootStrap.groovy contains this code:

  def init = { servletContext ->

     grailsApplication.mainContext.eventTriggeringInterceptor.datastores.each { k, datastore ->

        servletContext.getAttribute(ApplicationAttributes.APPLICATION_CONTEXT) .addApplicationListener new MyPersistenceListener(datastore)

     }

  }

After replacing these two lines in BuildConfig.groovy

  runtime ":hibernate4:4.3.5.5" // or ":hibernate:3.6.10.17"

  runtime ":database-migration:1.4.0"

with

  runtime ":mongodb:3.0.2"

the application won't even start anymore:

  | Error 2014-09-22 13:50:39,480 [localhost-startStop-1] ERROR context.GrailsContextLoaderListener  - Error initializing the application: Cannot get property 'datastores' on null object

  Message: Cannot get property 'datastores' on null object

      Line | Method

  ->>    7 | doCall                           in BootStrap$_closure1

Are persistence events not supported by the MongoDB GORM backed?

Regards,

Jesper

[Graeme Rocher]

the bean "eventTriggeringInterceptor" is specific to hibernate and
shouldn't be used directly. Register your listener as a spring bean
itself and it will be picked up

Cheers

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Graeme Rocher
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[Graeme Rocher]

Alternatively you can use

grailsApplication.mainContext.addApplicationListener(listener)

[Jesper Zedlitz]

Alternatively you can use

grailsApplication.mainContext.addApplicationListener(listener)

 

That would make it much easier. An AbstractPersistenceEventListener needs a Datastore instance as constructor parameter. How do I find the correct object?

[Graeme Rocher]

mainContext.getBean(Datastore)

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[Jesper Zedlitz]

Thank you very much for the hints so far. I have been able to register a custom persistence listener by adding these lines to BootStrap.groovy

  grailsApplication.mainContext.getBeansOfType(Datastore).values().each { ds ->

     grailsApplication.mainContext.addApplicationListener(new MyPersistenceListener(ds))

  }

An interesting observation - and I am leaving the topic of this thread a bit - is that the MongoDB datastore sets the event.entity field the Hibernate datastore does not set the field. Therefore I have to check the class of the entityObject for a general solution.