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.simulator.cluster;
  
  import org.apache.cassandra.simulator.cluster.OnInstanceRepair.RepairType;
  
  public interface ClusterActionListener
  {
      interface TopologyChangeValidator
      {
          public void before(Topology before, int[] participatingKeys);
          public void after(Topology after);
      }
  
      interface RepairValidator
      {
          public void before(Topology topology, RepairType repairType);
          public void after();
      }
  
      TopologyChangeValidator newTopologyChangeValidator(Object id);
      RepairValidator newRepairValidator(Object id);
  
      class NoOpListener implements ClusterActionListener
      {
  
          @Override
          public TopologyChangeValidator newTopologyChangeValidator(Object id)
          {
              return new TopologyChangeValidator()
              {
                  @Override
                  public void before(Topology before, int[] participatingKeys)
                  {
                  }
  
                  @Override
                  public void after(Topology after)
                  {
                  }
              };
          }
  
          @Override
          public RepairValidator newRepairValidator(Object id)
          {
              return new RepairValidator()
              {
                  @Override
                  public void before(Topology topology, RepairType repairType)
                  {
                  }
  
                  @Override
                  public void after()
                  {
                  }
              };
          }
      }
  }
  