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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
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   * 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.locator;
  
  import java.io.IOException;
  import java.util.*;
  
  import org.junit.After;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.Util;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.service.StorageService;
  import org.apache.cassandra.tcm.ClusterMetadataService;
  import org.apache.cassandra.tcm.StubClusterMetadataService;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static java.util.concurrent.TimeUnit.MILLISECONDS;
  
  public class DynamicEndpointSnitchTest
  {
      private double oldBadness;
  
      @Before
      public void before()
      {
          oldBadness = DatabaseDescriptor.getDynamicBadnessThreshold();
          DatabaseDescriptor.setDynamicBadnessThreshold(0.1);
          ClusterMetadataService.unsetInstance();
          ClusterMetadataService.setInstance(StubClusterMetadataService.forTesting());
      }
  
      @After
      public void after()
      {
          DatabaseDescriptor.setDynamicBadnessThreshold(oldBadness);
      }
  
      @BeforeClass
      public static void setupDD()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      private static void setScores(DynamicEndpointSnitch dsnitch, int rounds, List<InetAddressAndPort> hosts, Integer... scores) throws InterruptedException
      {
          for (int round = 0; round < rounds; round++)
          {
              for (int i = 0; i < hosts.size(); i++)
                  dsnitch.receiveTiming(hosts.get(i), scores[i], MILLISECONDS);
          }
          Thread.sleep(150);
      }
  
      private static EndpointsForRange full(InetAddressAndPort... endpoints)
      {
          EndpointsForRange.Builder rlist = EndpointsForRange.builder(ReplicaUtils.FULL_RANGE, endpoints.length);
          for (InetAddressAndPort endpoint: endpoints)
          {
              rlist.add(ReplicaUtils.full(endpoint));
          }
          return rlist.build();
      }
  
      @Test
      public void testSnitch() throws InterruptedException, IOException, ConfigurationException
      {
          // do this because SS needs to be initialized before DES can work properly.
          DatabaseDescriptor.setDynamicBadnessThreshold(0.1);
          StorageService.instance.unsafeInitialize();
          NodeProximity proximity = new NoOpProximity();
          DynamicEndpointSnitch dsnitch = new DynamicEndpointSnitch(proximity, String.valueOf(proximity.hashCode()));
          InetAddressAndPort self = FBUtilities.getBroadcastAddressAndPort();
          InetAddressAndPort host1 = InetAddressAndPort.getByName("127.0.0.2");
          InetAddressAndPort host2 = InetAddressAndPort.getByName("127.0.0.3");
          InetAddressAndPort host3 = InetAddressAndPort.getByName("127.0.0.4");
          InetAddressAndPort host4 = InetAddressAndPort.getByName("127.0.0.5");
          List<InetAddressAndPort> hosts = Arrays.asList(host1, host2, host3);
  
          // first, make all hosts equal
          setScores(dsnitch, 1, hosts, 10, 10, 10);
          EndpointsForRange order = full(host1, host2, host3);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
  
          // make host1 a little worse
          setScores(dsnitch, 1, hosts, 20, 10, 10);
          order = full(host2, host3, host1);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
  
          // make host2 as bad as host1
          setScores(dsnitch, 2, hosts, 15, 20, 10);
          order = full(host3, host1, host2);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
  
          // make host3 the worst
          setScores(dsnitch, 3, hosts, 10, 10, 30);
          order = full(host1, host2, host3);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
  
          // make host3 equal to the others
          setScores(dsnitch, 5, hosts, 10, 10, 10);
          order = full(host1, host2, host3);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
  
          /// Tests CASSANDRA-6683 improvements
          // make the scores differ enough from the ideal order that we sort by score; under the old
          // dynamic snitch behavior (where we only compared neighbors), these wouldn't get sorted
          setScores(dsnitch, 20, hosts, 10, 70, 20);
          order = full(host1, host3, host2);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3)));
  
          order = full(host4, host1, host3, host2);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3, host4)));
  
  
          setScores(dsnitch, 20, hosts, 10, 10, 10);
          order = full(host4, host1, host2, host3);
          Util.assertRCEquals(order, dsnitch.sortedByProximity(self, full(host1, host2, host3, host4)));
      }
  }
  