Griffon provides the ability to hook into scripting events. These are events triggered during execution of Griffon target and plugin scripts.

The mechanism is deliberately simple and loosely specified. The list of possible events is not fixed in any way, so it is possible to hook into events triggered by plugin scripts, for which there is no equivalent event in the core target scripts.

Defining event handlers

Event handlers are defined in scripts called _Events.groovy. Griffon searches for these scripts in the following locations:

Whenever an event is fired, all the registered handlers for that event are executed. Note that the registration of handlers is performed automatically by Griffon, so you just need to declare them in the relevant _Events.groovy file.

Event handlers are blocks defined in _Events.groovy, with a name beginning with "event". The following example can be put in your /scripts directory to demonstrate the feature:

eventCreatedArtefact = { type, name ->
   println "Created $type $name"
}

eventStatusUpdate = { msg -> println msg }

eventStatusFinal = { msg -> println msg }

You can see here the three handlers eventCreatedArtefact, eventStatusUpdate, eventStatusFinal. Griffon provides some standard events, which are documented in the command line reference guide. For example the compile command fires the following events:

Triggering events

To trigger an event simply call the event() closure:

event("StatusFinal", ["Super duper plugin action complete!"])

Common Events

Below is a table of some of the common events that can be leveraged:

EventParametersDescription
StatusUpdatemessagePassed a string indicating current script status/progress
StatusErrormessagePassed a string indicating an error message from the current script
StatusFinalmessagePassed a string indicating the final script status message, i.e. when completing a target, even if the target does not exit the scripting environment
CreatedArtefactartefactType,artefactNameCalled when a create-xxxx script has completed and created an artifact
CreatedFilefileNameCalled whenever a project source filed is created, not including files constantly managed by Griffon
ExitingreturnCodeCalled when the scripting environment is about to exit cleanly
PluginInstalledpluginNameCalled after a plugin has been installed
CompileStartkindCalled when compilation starts, passing the kind of compile - source or tests
CompileEndkindCalled when compilation is finished, passing the kind of compile - source or tests
DocStartkindCalled when documentation generation is about to start - javadoc or groovydoc
DocEndkindCalled when documentation generation has ended - javadoc or groovydoc