Grails: Plugglabe Service, Reloaded

Yesterday I've read, the post from Josh Creed about a pluggable service in Grails and I've been thinking the way to do with IoC and wire provider with Spring.

Let's do it, with small test.

First my service class GreetService:

class GreetService {

 def provider

 def sayHello(String name){
         provider.sayHello(name)
 }

}

Now, two Providers:

class DevProvider {
  def sayHello(String name){
          println "DevProvider: hello ${name}"
  }
}


class TestProvider {
  def sayHello(String name){
          println "TestProvider: hello ${name}"
  }
}

Now I'm gonna use Spring DSL, in resources.groovy, to define provider bean that depends of environment:

import grails.util.*
beans = {
   switch(GrailsUtil.environment) {
           case "test":
                   provider(TestProvider)
           break
           case "development":
                   provider(DevProvider)
           break
           }
   }

And that's all with Groovy and Grails magic, here the test:

class GreetServiceTests extends GroovyTestCase {

    def greetService

    void testGreet() {

            greetService.sayHello("World!!!!!!")
    }
}
// output: TestProvider: hello World!!!!!!

And in Grails console, another test:

def service = ctx.getBean("greetService")
service.sayHello("world")

// output: DevProvider: hello world