Grails服务抽象类 [英] Grails services in abstract class

问题描述

我有一个抽象类，许多类扩展。一切都在 src / groovy 中。

在我的抽象类中，我希望有一个服务注入，类会继承，所以我不必在每一个注入它们。

 抽象类动物{
 
 def noiseService 
 
抽象声音getSound（）
 
} 
 
 class Dog扩展动物{
 
 Sound getSound （）{
 noiseService.bark（）
} 
 
} 
  

在我的resources.groovy中：

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

说它不能实例化类，因为它是抽象的，所以我将它添加到定义中：

  bean.abstract = true 
  

现在，我不再收到错误，但服务在我的子类中始终为空。我怎样才能使这个工作？

解决方案

这是我最终做的。

我跟着Burt Beckwith的帖子在这里 http：/ /burtbeckwith.com/blog/?p=1017 创建一个ApplicationContextHolder类。

然后

<
$ abstract b


$ noise $ get









$ b}

现在这个作品

  class Dog extends Animal {
 
 Sound getSound（）{
 noiseService.bark（）
} 
 
 
  

我没有必要在resources.groovy中放置任何狗或动物班

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?

解决方案

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

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