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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.cassandra.distributed.test.ring;
  
  import java.util.List;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.impl.Instance;
  import org.apache.cassandra.distributed.test.log.FuzzTestBase;
  import org.apache.cassandra.net.MessageFlag;
  import org.apache.cassandra.net.Verb;
  import org.apache.cassandra.tcm.sequences.AddToCMS;
  
  public class CMSUrgentMessagesTest extends FuzzTestBase
  {
      @Test
      public void allPaxosMessagesAreUrgentTest() throws Throwable
      {
          try (Cluster cluster = builder().withNodes(3).start())
          {
              List<Throwable> thrown = new CopyOnWriteArrayList<>();
              cluster.filters()
                     .allVerbs()
                     .messagesMatching((from, to, msg) -> {
                         Verb verb = Verb.fromId(msg.verb());
                         if (!verb.toString().contains("PAXOS2"))
                             return false;
  
                         try
                         {
                             boolean hasFlag = cluster.get(1).callOnInstance(() -> Instance.deserializeHeader(msg).hasFlag(MessageFlag.URGENT));
                             assert hasFlag : String.format("%s does not have URGENT flag set: %s", verb, msg);
                         }
                         catch (Throwable t)
                         {
                             thrown.add(t);
                         }
                         return false;
                     })
                     .drop();
  
              for (int idx : new int[]{ 2, 3 })
                  cluster.get(idx).runOnInstance(() -> AddToCMS.initiate());
  
              if (!thrown.isEmpty())
              {
                  Throwable t = new AssertionError("Caught exceptions");
                  for (Throwable throwable : thrown)
                      t.addSuppressed(throwable);
                  throw t;
              }
          }
      }
  
  }
  