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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.
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  package org.apache.cassandra.repair;
  
  import org.apache.cassandra.dht.IPartitioner;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.dht.Range;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.streaming.PreviewKind;
  import org.apache.cassandra.utils.MerkleTrees;
  
  import org.junit.Test;
  
  import java.net.UnknownHostException;
  import java.util.UUID;
  
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  public class ValidationTaskTest 
  {
      @Test
      public void shouldDeactivateOnFailure() throws UnknownHostException
      {
          ValidationTask task = createTask();
          assertTrue(task.isActive());
          task.treesReceived(null);
          assertFalse(task.isActive());
      }
  
      @Test
      public void shouldIgnoreTreesWhenDeactivated() throws Exception
      {
          ValidationTask task = createTask();
          assertTrue(task.isActive());
          task.abort(new RuntimeException());
          assertFalse(task.isActive());
          task.treesReceived(new MerkleTrees(null));
          // REVIEW: setting null would cause NPEs in sync task, so it was never correct to set null
          assertTrue(task.isDone());
          assertFalse(task.isSuccess());
      }
  
      @Test
      public void shouldReleaseTreesOnAbort() throws Exception
      {
          ValidationTask task = createTask();
          assertTrue(task.isActive());
  
          IPartitioner partitioner = Murmur3Partitioner.instance;
          MerkleTrees trees = new MerkleTrees(partitioner);
          trees.addMerkleTree(128, new Range<>(partitioner.getMinimumToken(), partitioner.getMaximumTokenForSplitting()));
          task.treesReceived(trees);
          assertEquals(1, trees.size());
          
          // This relies on the fact that MerkleTrees clears its range -> tree map on release.
          task.abort(new RuntimeException());
          assertEquals(0, trees.size());
      }
      
      private ValidationTask createTask() throws UnknownHostException {
          InetAddressAndPort addressAndPort = InetAddressAndPort.getByName("127.0.0.1");
          RepairJobDesc desc = new RepairJobDesc(nextTimeUUID(), nextTimeUUID(), UUID.randomUUID().toString(), UUID.randomUUID().toString(), null);
          return new ValidationTask(SharedContext.Global.instance, desc, addressAndPort, 0, PreviewKind.NONE, false);
      }
  }
  