How to implement a Replication Event Listener

Question

How can I implement a Replication Event Listener?

Answer, Resolution

1. Create a class that implements EventHandler interfaces.
2. Add the following SCR annotations
   

    @scr.component metatype="false" immediate="true"
   
    @scr.service interface="org.osgi.service.event.EventHandler"
   
    @scr.property name="event.topics" valueRef="ReplicationAction.EVENT_TOPIC"
   
   
   

3. Implement public void handleEvent(Event event) method.

Example

This simple example adds a Replication Event Listener to Geometrixx application. All it does is log the events it receives.

1. Open CRXDE
2. Add the following class implementation. Make sure to save it in the correct folder under /apps/geometrixx/src/impl/src/main/java based on the package name.
   

   package com.day.cq.wcm.apps.geometrixx.impl;
   
   
   
   import org.osgi.service.event.Event;
   
   import com.day.cq.workflow.event.WorkflowEvent;
   
   import org.osgi.service.event.EventHandler;
   
   import org.slf4j.Logger;
   
   import org.slf4j.LoggerFactory;
   
   
   
   import com.day.cq.replication.ReplicationAction;
   
   
   
   /**
   
    * This is an example listener that listens for replication events and
   
    * logs a message.
   
    *
   
    * @scr.component metatype="false" immediate="true"
   
    * @scr.service interface="org.osgi.service.event.EventHandler"
   
    * @scr.property name="event.topics" valueRef="ReplicationAction.EVENT_TOPIC"
   
    */
   
   public class ReplicationEventListener implements EventHandler {
   
   
   
    /**
   
        * default logger
   
        */
   
       private static final Logger log = LoggerFactory.getLogger(ReplicationEventListener.class);
   
       
   
    public void handleEvent(Event event) {
   
     String n[] = event.getPropertyNames();
   
     log.info("");
   
     log.info("Event occurred: {}", event.getProperty(WorkflowEvent.EVENT_TYPE));
   
     log.info("Event properties: ");
   
     for(String s : n) {
   
      log.info(s + " = " + event.getProperty(s));
   
     }
   
     
   
     ReplicationAction action = ReplicationAction.fromEvent(event);
   
     if(action != null) {
   
      log.info("Replication action {} occured on {} ", action.getType().getName(), action.getPath());
   
     }
   
     log.info("");
   
    }
   
   
   
   }
   
   
   

3. Right click file com.day.cq.wcm.cq-wcm-geometrixx.bnd under /apps/geometrixx/src/impl/src/main/java and select Build->Build Bundle. This should build and restart geometrixx bundle in CQ instance your CRXDE is connected to.
   • Note, if you don't see com.day.cq.wcm.cq-wcm-geometrixx.bnd then right click on pom.xml and select Build->Generate .bnd file.
4. To verify that your new event lister has been deployed go to the components tab in the Felix Console and make sure com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener is there.

To test your replication listener activate a page in CQ and examine crx-quickstart/logs/error.log file under your CQ installation. By default all logging from code deployed in CQ should go there. You should see messages similar to

16.07.2010 13:01:32.525 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener 

16.07.2010 13:01:32.525 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener Event occurred: null

16.07.2010 13:01:32.525 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener Event properties: 

16.07.2010 13:01:32.525 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener event.topics = com/day/cq/replication

16.07.2010 13:01:32.525 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener path = /content/geometrixx/en/news/webcasts

16.07.2010 13:01:32.525 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener type = ACTIVATE

16.07.2010 13:01:32.526 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener modificationDate = java.util.GregorianCalendar[time=1279310491837,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="America/Los_Angeles",offset=-28800000,dstSavings=3600000,useDaylight=true,transitions=185,lastRule=java.util.SimpleTimeZone[id=America/Los_Angeles,offset=-28800000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=3,startMonth=2,startDay=8,startDayOfWeek=1,startTime=7200000,startTimeMode=0,endMode=3,endMonth=10,endDay=1,endDayOfWeek=1,endTime=7200000,endTimeMode=0]],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2010,MONTH=6,WEEK_OF_YEAR=29,WEEK_OF_MONTH=3,DAY_OF_MONTH=16,DAY_OF_YEAR=197,DAY_OF_WEEK=6,DAY_OF_WEEK_IN_MONTH=3,AM_PM=1,HOUR=1,HOUR_OF_DAY=13,MINUTE=1,SECOND=31,MILLISECOND=837,ZONE_OFFSET=-28800000,DST_OFFSET=3600000]

16.07.2010 13:01:32.526 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener event.distribute = 

16.07.2010 13:01:32.526 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener userId = admin

16.07.2010 13:01:32.526 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener Replication action Activate occured on /content/geometrixx/en/news/webcasts 

16.07.2010 13:01:32.526 *INFO* [Thread-5560] com.day.cq.wcm.apps.geometrixx.impl.ReplicationEventListener

Applies To

CQ 5.3

Other Related Articles: