EVENT HANDLER

EVENT HANDLER WHICH SEND MAIL WHEN NODE IS CREATED IN CQ(AEM)

Event handling can be done in a lot of different ways within CQ, that all have their cost, their impact, and their benefits.

Five ways of doing such events are detailed here

• At the JCR level with observation
• At the Sling level with event handlers and jobs
• At the CQ level with workflows & launchers
• Particular case of scheduled event
• Particular case of POST to the repository

JCR Observer

Is the lowest-level event handling in CQ. As its name indicates it, is at JCR level and allows to listen to JCR-level events, gathered in sets (corresponding to persistence transactions). javax.jcr.observation.Event lists following types:

·       Event.NODE_ADDED
·       Event.NODE_MOVED
·       Event.NODE_REMOVED
·       Event.PERSIST
·       Event.PROPERTY_ADDED
·       Event.PROPERTY_CHANGED
·       Event.PROPERTY_REMOVED

                        In order to listen to such an event, you have to:

·       Manage a live session through which you will listen to the repository
·       Decide how and when you listen to it.
·       Implement the handler that receive all JCR events filtered by your definition.

STEP WHICH YOU HAVE TO FOLLOW-----

• Create Maven bundle-If you are not familiar with this follow this link-http://tutorials.jenkov.com/maven/maven-tutorial.html
• Make package in the bundle and inside make java file like

• Paste below code in the java file 
  import org.apache.felix.scr.annotations.Component; 

import org.apache.felix.scr.annotations.Service;

import org.osgi.framework.BundleContext;

import org.osgi.service.component.ComponentContext;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import java.util.ArrayList;

import java.util.Arrays;

import javax.jcr.Node;

import javax.jcr.Repository;

import javax.jcr.RepositoryException;

import javax.jcr.Session;

import javax.jcr.observation.Event;

import javax.jcr.observation.EventIterator;

import javax.jcr.observation.EventListener;

import javax.jcr.observation.ObservationManager;

import org.apache.sling.jcr.api.SlingRepository;

import org.osgi.service.component.ComponentContext;

import org.apache.felix.scr.annotations.Activate;

import org.apache.felix.scr.annotations.Component;

import org.apache.felix.scr.annotations.Properties;

import org.apache.felix.scr.annotations.Property;

import org.apache.felix.scr.annotations.Reference;

import org.apache.felix.scr.annotations.Service;

//Sling Imports

import org.apache.sling.api.resource.ResourceResolverFactory ;

import org.apache.sling.api.resource.ResourceResolver;

import org.apache.sling.api.resource.Resource;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import org.apache.commons.mail.Email;

import org.apache.commons.mail.EmailException;

import org.apache.commons.mail.SimpleEmail;

//mail api import

import com.day.cq.mailer.MessageGateway;

import com.day.cq.mailer.MessageGatewayService;

@Component(metatype=true)

@Service

public class Eventhandle implements Runnable,EventListener {

//Inject a MessageGatewayService

@Reference

private MessageGatewayService messageGatewayService;

private Logger log = LoggerFactory.getLogger(this.getClass());

private BundleContext bundleContext;

//Inject a Sling ResourceResolverFactory

@Reference

private ResourceResolverFactory resolverFactory;

private Session session;

private ObservationManager observationManager;

//Inject a Sling ResourceResolverFactory to create a Session requited by the EventHandler

@Reference

private SlingRepository repository;

public void run() {

log.info("Running...");

}

//Place app logic here to define the AEM Custom Event Handler

protected void activate(ComponentContext ctx) {

this.bundleContext = ctx.getBundleContext();

try

{

//Invoke the adaptTo method to create a Session

ResourceResolver resourceResolver = resolverFactory.getAdministrativeResourceResolver(null);

session = resourceResolver.adaptTo(Session.class);

// Setup the event handler to respond to a new claim under content/geometrixx

observationManager = session.getWorkspace().getObservationManager();

final String[] types = { "nt:unstructured","sling:Folder" };

final String path = "/content/geometrixx-outdoors"; // define the path

observationManager.addEventListener(this, Event.NODE_ADDED, path, true, null, types, false);

log.info("Observing property changes to {} nodes under {}", Arrays.asList(types), path);

}

catch(Exception e)

{

e.printStackTrace();

}

}

protected void deactivate(ComponentContext componentContext) throws RepositoryException {

if(observationManager != null) {

observationManager.removeEventListener(this);

}

if (session != null) {

session.logout();

session = null;

}

}

//Define app logic that is fired when the event occurs - simply track the time

//when the event occurred.

public void onEvent(EventIterator itr)

{

log.info("on event(-) ");//log to check the event fired or not

Calendar cal = Calendar.getInstance();

cal.getTime();

SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");

//log the time when the event occurred

log.info("A new node was added to content/geometrixx at : " +cal.getTime());

//EMAIL SEDING CODE …..

try

{

//ensure that the execute method is invoked

//Declare a MessageGateway service

MessageGateway<Email> messageGateway;

//Set up the Email message

Email email = new SimpleEmail();

//Set the mail values

String emailToRecipients = "recipient@gmail.COM";

String emailCcRecipients = "ccreceipent@gmail.com";

email.addTo(emailToRecipients);

email.addCc(emailCcRecipients);

email.setSubject("node created");

email.setFrom("youremail@gmail.com");

email.setMsg("This message is to inform you that the CQ content has been added");

log.info("Here in execute method"+email);

//Inject a MessageGateway Service and send the message

messageGateway = messageGatewayService.getGateway(Email.class);

// Check the logs to see that messageGateway is not null

messageGateway.send((Email) email);

log.info("message send sucessfully");//meaaage in the error log file //after sending email

}

catch (Exception e)

{

e.printStackTrace();

log.info("Exception Area"+e);

}

}

}

 

• You have to add dependecies in pom.xml that is..

    

    <dependency>

    <groupId>com.day.cq</groupId>

       <artifactId>cq-mailer</artifactId>

       <version>5.6.2</version>

        <scope>provided</scope>

        </dependency>

• Buid bundle by running and deploy in Console.
• Open http://localhost:5610/system/console/configMgr and Set the properties for gmail like below
  SMTP server host name:smt.gmail.com
  SMTP server port:465
  SMTP user:youremail@gmail.com
  SMTP password :your email password
  From address :youremail@gmail.com
  SMTP use SSL :true(for ssl)
• Save it.
• Run Stop and run the Bundle. If everything fine check log message will come when you add node of type untructure and nt:folder inside the path of jcr:node
• Finally email will be received check gmail.