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.
Usage
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 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" }} |
Arguments
| Name | Mandatory | Default | Description |
|---|---|---|---|
| namespace | false | app | A string scope |
| topic | true | A string topic to listen for | |
| callback | true | A closure handler which takes an EventReply as an argument |