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copied!<p>You can have your plugin service publish an event when it completes then listen for that event in your main application. I have used this pattern a few times and it has been a very convenient way to decouple various pieces of of my application. To do this, create an <a href="http://static.springsource.org/spring/docs/1.2.9/api/org/springframework/context/ApplicationEvent.html" rel="nofollow">event</a> class.</p> <pre><code>class PluginEvent extends ApplicationEvent { public PluginEvent(source) { super(source) } } </code></pre> <p>Then, have your plugin service implement <code>ApplicationContextAware</code>. That gives your plugin a way to publish your events</p> <pre><code>class PluginService implements ApplicationContextAware { def applicationContext def serviceMethod() { //do stuff publishPluginEvent() } private void publishPluginEvent() { def event = new PluginEvent(this) applicationContext.publishEvent(event) } } </code></pre> <p>Then in your main application, create a listener service that will respond when the event is published:</p> <pre><code>class ApplicationService implements ApplicationListener<PluginEvent> { void onApplicationEvent(PluginEvent event) { //whatever you want to do in your app when // the plugin service fires. } } </code></pre> <p>This listener doesn't need to be a Grails Service, you can just use a POJO/POGO, but you'll need to configure it as a spring bean inside <code>resources.groovy</code>.</p> <p>I have been using this approach recently and it has worked well for me. It's definitely a nice tool to have in your Grails toolbox. </p>

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