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Mario248
Mario248
New Participant
February 5, 2024
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How to create sling events for specific templates in aem?

  • February 5, 2024
  • 2 replies
  • 1644 views
I want to make an external call whenever the page is published and I don't want to do this for all pages. Only certain pages I want to do this call. For example for the page is created with /conf/abc/template template.(cq:template = /conf/abc/template)
 
Could anyone tell me what sling event API to use for this requirement ?
 
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Best answer by Kamal_Kishor

@mario248 : Every template has a resource type, I believe you can make use of that instead of template name. Also, you can use this in combination with path as well.

@Component(service = EventHandler.class, immediate = true, property = { Constants.SERVICE_DESCRIPTION + "=Event Handler ", EventConstants.EVENT_TOPIC + "="+ReplicationAction.Event_Topic, EventConstants.EVENT_FILTER + "= ((path=/content/your-site/*)(resourceType=myapp/components/page/your-page-component))" })

You can refer this :- https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/event-filter-is-not-working/m-p/374198

https://techagyan.blogspot.com/2015/02/aem-event-handling-and-filtering.html

 

thanks.

 

2 replies

Kamal_Kishor
Kamal_KishorAccepted solution
New Participant
February 5, 2024

@mario248 : Every template has a resource type, I believe you can make use of that instead of template name. Also, you can use this in combination with path as well.

@Component(service = EventHandler.class, immediate = true, property = { Constants.SERVICE_DESCRIPTION + "=Event Handler ", EventConstants.EVENT_TOPIC + "="+ReplicationAction.Event_Topic, EventConstants.EVENT_FILTER + "= ((path=/content/your-site/*)(resourceType=myapp/components/page/your-page-component))" })

You can refer this :- https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/event-filter-is-not-working/m-p/374198

https://techagyan.blogspot.com/2015/02/aem-event-handling-and-filtering.html

 

thanks.

 

    Mario248
    Mario248Author
    New Participant
    February 5, 2024

    Thank for your reply. For some reason the sling resource type is common for other pages hence I have to reply on cq:template property hence I tried below code but it is not working. any reason ?

     

    @Component(service = EventHandler.class, immediate = true, property = {
        Constants.SERVICE_DESCRIPTION + "=Event Handler ",
        EventConstants.EVENT_TOPIC + "="+ReplicationAction.EVENT_TOPIC,
        EventConstants.EVENT_FILTER + "= ((cq:template=/conf/abc/template))" })
      Kamal_Kishor
      Kamal_Kishor
      New Participant
      February 6, 2024

      @mario248 : In that case, you will have to create an EventHandler at a path level to reduce triggering of it everywhere and then in handleEvent method you can apply the filter based on cq:template property.

      @Override public void handleEvent(Event event) { ReplicationAction replicationAction = ReplicationAction.fromEvent(event); String pagePath = replicationAction.getPath(); //read the jcr:content/cq:template property value and check if it matches with your template. based on the match you can take action. }
        iamnjain
        iamnjain
        New Participant
        February 5, 2024

        Hi @mario248 

         

        You can use ResourceChangeListener class to handle sling level events and below is the sample code and you can customize it according to your business logic.

        import org.apache.sling.api.resource.observation.ResourceChange; import org.apache.sling.api.resource.observation.ResourceChangeListener; import org.osgi.service.component.annotations.Component; @Component(service = ResourceChangeListener.class, property = { "sling.resourceType=/conf/abc/temp1", // Target the specific template "path=/content/(.*)" // Observe page creation under content }) public class PageCreationEventHandler implements ResourceChangeListener { @Override public void onChange(ResourceChange change) { if (change.getType() == ResourceChange.Type.ADDED) { // Page has been created String pagePath = change.getPath(); // Your custom logic here System.out.println("Page created: " + pagePath); // Example: Send a notification, perform additional processing, etc. } } }


        Hope it helps. 🙂

          Mario248
          Mario248Author
          New Participant
          February 5, 2024

          Thanks for your response. You are using ResourceChangeListener over sling events. Is there any preference and suggestion?

            joerghoh
            joerghoh
            Employee
            February 11, 2024

            The ResourceChangeListener is the recommended approach, as sending all repository changes as OSGI events is not scalable enough. Also you need to handle all requests, you cannot limit your listener be called only for a certain path(s).

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