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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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;

/**
 * A listener that can be implemented to handle region reliability membership events. These are
 * membership events that are specific to loss or gain of required roles as defined by the region's
 * {@link MembershipAttributes}.
 * 
 * Instead of implementing this interface it is recommended that you extend the
 * {@link org.apache.geode.cache.util.RegionRoleListenerAdapter} class.
 * 
 * 
 * @see AttributesFactory#setCacheListener
 * @see RegionAttributes#getCacheListener
 * @see AttributesMutator#setCacheListener
 * @deprecated this feature is scheduled to be removed
 */
public interface RegionRoleListener extends CacheListener {

  /**
   * Invoked when a required role has returned to the distributed system after being absent.
   *
   * @param event describes the member that fills the required role.
   */
  public void afterRoleGain(RoleEvent event);

  /**
   * Invoked when a required role is no longer available in the distributed system.
   *
   * @param event describes the member that last filled the required role.
   */
  public void afterRoleLoss(RoleEvent event);

}