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.junit.Test;
  
  import org.apache.cassandra.tcm.membership.NodeState;
  
  import static org.apache.cassandra.tcm.listeners.ClientNotificationListener.ChangeType.*;
  import static org.apache.cassandra.tcm.listeners.ClientNotificationListener.fromNodeStateTransition;
  import static org.apache.cassandra.tcm.membership.NodeState.*;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  public class ClientNotificationListenerTest
  {
      @Test
      public void testTransitions()
      {
          assertEquals(fromNodeStateTransition(null, JOINED), JOIN);
          assertEquals(fromNodeStateTransition(REGISTERED, JOINED), JOIN);
          assertEquals(fromNodeStateTransition(BOOTSTRAPPING, JOINED), JOIN);
  
          for (NodeState ns : NodeState.values())
          {
              if (ns == LEFT)
                  continue;
              assertEquals(ns.toString(), fromNodeStateTransition(ns, LEFT), LEAVE);
          }
  
          assertEquals(fromNodeStateTransition(null, LEFT), LEAVE);
  
          // no client notifications when leaving/moving start:
          assertNull(fromNodeStateTransition(JOINED, LEAVING));
          assertNull(fromNodeStateTransition(JOINED, MOVING));
  
          // no client notifications until JOINED
          assertNull(fromNodeStateTransition(null, BOOTSTRAPPING));
          assertNull(fromNodeStateTransition(null, REGISTERED));
  
          // if LEAVING/MOVING is the first state we see for a node, assume it was JOINED before;
          assertEquals(fromNodeStateTransition(null, LEAVING), JOIN);
          assertEquals(fromNodeStateTransition(null, MOVING), JOIN);
  
          assertEquals(fromNodeStateTransition(MOVING, JOINED), MOVE);
      }
  }
  