content: /*
   *  Copyright 2015 Adobe Systems Incorporated
   *
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package com.aem.geeks.core.listeners;
  
  import org.apache.sling.api.SlingConstants;
  import org.osgi.service.component.annotations.Component;
  import org.osgi.service.component.propertytypes.ServiceDescription;
  import org.osgi.service.event.Event;
  import org.osgi.service.event.EventConstants;
  import org.osgi.service.event.EventHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A service to demonstrate how changes in the resource tree
   * can be listened for. It registers an event handler service.
   * The component is activated immediately after the bundle is
   * started through the immediate flag.
   * Please note, that apart from EventHandler services,
   * the immediate flag should not be set on a service.
   */
  @Component(service = EventHandler.class,
             immediate = true,
             property = {
                     EventConstants.EVENT_TOPIC + "=org/apache/sling/api/resource/Resource/*"
             })
  @ServiceDescription("Demo to listen on changes in the resource tree")
  public class SimpleResourceListener implements EventHandler {
  
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      public void handleEvent(final Event event) {
          logger.debug("Resource event: {} at: {}", event.getTopic(), event.getProperty(SlingConstants.PROPERTY_PATH));
      }
  }
  
  