class Handler {
    
    def messages = []
    
    def methodMissing(String name, args) {
        messages << [name,args]
    }
    
    def playBack(obj) {
        messages.each { name, args ->
            obj."$name"(args)
        }
    }
}

class Something {

    def methodMissing(String name, args) {
        println "$name $args"
    }
    
    def doThis(obj) {
        println "doThis"
    }

    def doThat(obj) {
        println "doThat"
    }
}

def handler1 = new Handler()
handler1.doThis "t"
handler1.doThat "test"
handler1.doNothing "testing"
handler1.playBack new Something()

handler1.doNothing "testing"
handler1.doThat "test"
handler1.doThis "t"
handler1.playBack new Something()

def handler2 = new Handler()
handler2.doNothing "testing"
handler2.doThat "test"
handler2.doThis "t"
def something = new Something()
something.metaClass."doThis" = { println "new doThis" }
handler2.playBack something