在域对象和静态范围中获取grails 2.0.0M1配置信息？

Question

How do I get to the Config.groovy information from a domain object, or from a static scope? I'm using ConfigurationHolder.config.* now, but that and ApplicationHolder are deprecated so I'd like to 'do it right' ... but the grailsApplication object isn't available in a DO/static scope.

Answer 1

The Grails 2 replacement for the deprecated ApplicationHolder , ConfigurationHolder , etc. is grails.util.Holders , which provides the same functionality but in a way that is safe when several different webapps in the same container are sharing a single copy of the Grails JARs in a parent classloader (this being the case where the old holders broke down).

import grails.util.Holders

// ...

static void foo() {
  def configOption = Holders.config.myapp.option
}

Answer 2

I'd add the grailsApplication to the metaclass of domain classes - this is something I'm thinking about doing for 2.0 final. For now, put it in BootStrap.groovy , eg

class BootStrap {

   def grailsApplication

   def init = { servletContext ->
      for (dc in grailsApplication.domainClasses) {
         dc.clazz.metaClass.getGrailsApplication = { -> grailsApplication }
         dc.clazz.metaClass.static.getGrailsApplication = { -> grailsApplication }
      }      
   }
}

Then you can access the config from grailsApplication.config , and Spring beans via grailsApplication.mainContext.getBean('foo') or just grailsApplication.mainContext.foo .

Answer 3

I really wanted to access config in static utilities only. After searching and reading most of the answers on SO, i came with simple solution(May be useful for somebody):

Add holder class under src/groovy:

class StaticContext {
    static def app;
}

initialize it in bootstrap init

class BootStrap {

    def grailsApplication

    def init = { servletContext ->
      StaticContext.app = grailsApplication
    }

    def destroy = {
    }
}

And access it in static utilities :

//In my case Solr URL in single ton
def solrUrl = StaticContext.app.config.solr.url

Answer 4

In Grails 2.2.5 I found this would work:

1. Configure your variable in grails-app/conf/Config.groovy , in the section appropiate for your environment. For example:

    environments { ... development { ... grails.config.myUrl = "http://localhost:3000" ... 

   ...

2. To access:

    import grails.util.Holders class myClass { ... def static myStaticMethod() { def myVar = Holders.config.grails.config.myUrl ...