content: /*
   * 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.cassandra.service;
  
  import org.apache.cassandra.locator.InetAddressAndPort;
  
  /**
   * Interface on which interested parties can be notified of high level endpoint
   * state changes.
   *
   * Note that while IEndpointStateChangeSubscriber notify about gossip related
   * changes (IEndpointStateChangeSubscriber.onJoin() is called when a node join
   * gossip), this interface allows to be notified about higher level events.
   */
  public interface IEndpointLifecycleSubscriber
  {
      /**
       * Called when a new node joins the cluster, i.e. either has just been
       * bootstrapped or "instajoins".
       *
       * @param endpoint the newly added endpoint.
       */
      public void onJoinCluster(InetAddressAndPort endpoint);
  
      /**
       * Called when a new node leave the cluster (decommission or removeToken).
       *
       * @param endpoint the endpoint that is leaving.
       */
      public void onLeaveCluster(InetAddressAndPort endpoint);
  
      /**
       * Called when a node is marked UP.
       *
       * @param endpoint the endpoint marked UP.
       */
      public void onUp(InetAddressAndPort endpoint);
  
      /**
       * Called when a node is marked DOWN.
       *
       * @param endpoint the endpoint marked DOWN.
       */
      public void onDown(InetAddressAndPort endpoint);
  
      /**
       * Called when a node has moved (to a new token).
       *
       * @param endpoint the endpoint that has moved.
       */
      public void onMove(InetAddressAndPort endpoint);
  }
  