Groovy DSL example: Hello World

HelloWorldDsl.groovy

class HelloWorldService {
	// this function becomes a keyword in our DSL
    void printHelloWorld() {
        println("Hello World")
    }
}

class HelloWorldScript {
    static void execute(Closure script) {
    	// here we wire the colure with the service
        script.delegate = new HelloWorldService()
        
        // search the delegate for variables and methods
        // if they do not exist search the scope of the closures definition
        script.resolveStrategy = Closure.DELEGATE_FIRST
        
        // the closure is executed in the context of its delegate
        script()
    }
}

HelloWorldScript.execute {
    printHelloWorld()
    
    for(def i = 0; i < 10; i++) {
        printHelloWorld()
    }
}