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.tcm.listeners;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.gms.Gossiper;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.Epoch;
  
  public class UpgradeMigrationListener implements ChangeListener.Async
  {
      private static final Logger logger = LoggerFactory.getLogger(UpgradeMigrationListener.class);
      public void notifyPostCommit(ClusterMetadata prev, ClusterMetadata next, boolean fromSnapshot)
      {
          if (!prev.epoch.equals(Epoch.UPGRADE_GOSSIP))
              return;
  
          logger.info("Detected upgrade from gossip mode, updating my host id in gossip to {}", next.myNodeId());
          Gossiper.instance.mergeNodeToGossip(next.myNodeId(), next);
      }
  }
  