Grails文档中的自定义事件侦听器示例 [英] Custom event listener example in Grails documentation

问题描述

我试图在 Bootstrap.groovy 中添加一个自定义的GORM事件监听器类，如 Grails文档，但它不适合我。这里是直接从文档代码：

  def init = {
 application.mainContext.eventTriggeringInterceptor.datastores.each {k，数据存储 - > 
 applicationContext.addApplicationListener new MyPersistenceListener（datastore）
} 
} 
  

当我运行它时，编译器会抱怨应用程序和applicationContext为空。我已经尝试将它们添加为类级别的成员，但它们并没有神奇地将服务风格连接起来。到目前为止，我得到的最接近的是：

  def grailsApplication 
 def init = {servletContext  - > 
 def applicationContext = servletContext.getAttribute（ApplicationAttributes.APPLICATION_CONTEXT）
 grailsApplication.mainContext.eventTriggeringInterceptor.datastores.each {k，datastore  - > 
 applicationContext.addApplicationListener new GormEventListener（datastore）
} 
} 
  

但我仍然收到错误： java.lang.NullPointerException：无法获得null对象的属性'datastores'。

感谢您阅读...

编辑：版本2.2.1

解决方案

如果您这样做：

  ctx.getBeansOfType（Datastore）.values（）。each {Datastore d  - > 
 ctx.addApplicationListener new MyPersistenceListener（d）
} 
  

需要安装Hibernate插件

I'm trying to add a custom GORM event listener class in Bootstrap.groovy, as described in the Grails documentation but its not working for me. Here is the code straight from the docs:

def init = {
    application.mainContext.eventTriggeringInterceptor.datastores.each { k, datastore ->
        applicationContext.addApplicationListener new MyPersistenceListener(datastore)
    }
}

When I run it, the compiler complains that application and applicationContext are null. I've tried adding them as class level members but they don't get magically wired up service-style. The closest I've got so far is:

def grailsApplication
def init = { servletContext ->
    def applicationContext = servletContext.getAttribute(ApplicationAttributes.APPLICATION_CONTEXT)
    grailsApplication.mainContext.eventTriggeringInterceptor.datastores.each { k, datastore ->
        applicationContext.addApplicationListener new GormEventListener(datastore)
    }
}

But I still get errors: java.lang.NullPointerException: Cannot get property 'datastores' on null object.

Thanks for reading...

EDIT: version 2.2.1

解决方案

If you do:

ctx.getBeansOfType(Datastore).values().each { Datastore d ->
   ctx.addApplicationListener new MyPersistenceListener(d)
}

This should work without needing the Hibernate plugin installed

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