geode-core/src/main/java/org/apache/geode/cache/DynamicRegionListener.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.cache;

/**
 * <code>DynamicRegionListener</code> is an interface that can be implemented to handle dynamic
 * region-related events.
 *
 * The methods on a <code>DynamicRegionListener</code> are invoked synchronously. If the listener
 * method takes a long time to execute then it will cause the operation that caused it to be invoked
 * to take a long time.
 * <p>
 * Note: It is possible to receive duplicate create events when the DynamicRegionFactory goes active
 * due to Cache creation.
 * <p>
 * See {@link DynamicRegionFactory}
 *
 * @since GemFire 4.3
 */
public interface DynamicRegionListener {

  /**
   * Handles the 'before region creation' event of a dynamic region. This method is invoked before
   * the dynamic region is created in the local VM.
   *
   * @param parentRegionName The name of the parent region
   * @param regionName The name of the region being created
   */
  void beforeRegionCreate(String parentRegionName, String regionName);

  /**
   * Handles the 'after region creation' event of a dynamic region. This method is invoked after the
   * dynamic region is created in the local VM.
   *
   * @param event A <code>RegionEvent</code> describing the event
   */
  void afterRegionCreate(RegionEvent<?, ?> event);

  /**
   * Handles the 'before region destroyed' event of a dynamic region. This method is invoked before
   * the dynamic region is destroyed in the local VM.
   *
   * @param event A <code>RegionEvent</code> describing the event
   */
  void beforeRegionDestroy(RegionEvent<?, ?> event);

  /**
   * Handles the 'after region destroyed' event of a dynamic region. This method is invoked after
   * the dynamic region is destroyed in the local VM.
   *
   * @param event A <code>RegionEvent</code> describing the event
   */
  void afterRegionDestroy(RegionEvent<?, ?> event);
}