CODEWITHSUNDEEP
springgrailsgroovyabstract-class
James Kleeh
James Kleeh

Reputation: 12228

Grails services in abstract class

I have an abstract class that many classes extend. Everything is in src/groovy.

In my abstract class I would like to have a service injected that the child classes would inherit so I don't have to inject them in every single one.

abstract class Animal {

    def noiseService

    abstract Sound getSound()

}

class Dog extends Animal {

    Sound getSound() {
        noiseService.bark()
    }

}

In my resources.groovy:

animal(com.thepound.Animal) { bean ->
    noiseService = ref("noiseService")
}

This produced an error saying it couldn't instantiate the class because it is abstract, so I added this to the definition:

    bean.abstract = true

Now I no longer get an error, however the services are always null in my child classes. How can I get this to work?

Upvotes: 0

Views: 2462

Answers (2)

James Kleeh
James Kleeh

Reputation: 12228

Here is what I ended up doing.

I followed Burt Beckwith's post here http://burtbeckwith.com/blog/?p=1017 to create an ApplicationContextHolder class.

Then

abstract class Animal {

    def noiseService = ApplicationContextHolder.getBean("noiseService")

    abstract Sound getSound()

}

Now this works

class Dog extends Animal {

    Sound getSound() {
        noiseService.bark()
    }

}

I didn't have to put anything in resources.groovy for the Dog or Animal classes

Upvotes: 1

raffian
raffian

Reputation: 32066

If you want to instantiate Dog, just do this:

noiseService(com.whatever.DogNoiseService) { bean ->
}

animal(com.thepound.Dog) { bean ->
    noiseService = ref("noiseService")
}

Upvotes: 0

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