(Quick Reference)

on([String namespace ,] String topic, Closure callback)

Available in Controllers, Domains and Services

This method dynamically registers a closure handler for a given namespace/topic. Default Namespace is app if undefined. It returns a stringified ListenerId.


{docx} class SomeController{

def testInlineListener = { //register with 'logout' topic on 'app' default namespace def listener = on("logout") {User user -> println "test $user" } render "$listener registered" }

def testInlineListener2 = { //register a 'gorm' namespaced handler on 'afterInsert' topic. def listener = on("gorm", "afterInsert") {Book book -> println "test $book" } render "$listener registered" } } {docx}


namespacefalse app A string scope
topictrue A string topic to listen for
callbacktrue A closure handler which takes an EventReply as an argument