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.transport;
  
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.util.Collection;
  import java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.IntStream;
  
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class ProtocolVersionTrackerTest
  {
      @Test
      public void addConnection_shouldUpdateSetToLatestTimestamp() throws UnknownHostException, InterruptedException
      {
          ProtocolVersionTracker pvt = new ProtocolVersionTracker();
          final InetAddress client = InetAddress.getByName("127.0.1.1");
          pvt.addConnection(client, ProtocolVersion.V4);
  
          for(InetAddress addr : getMockConnections(10))
          {
              pvt.addConnection(addr, ProtocolVersion.V4);
          }
  
          Collection<ClientStat> clientIPAndTimes1 = pvt.getAll(ProtocolVersion.V4);
          assertEquals(10, clientIPAndTimes1.size());
  
          Thread.sleep(10);
  
          pvt.addConnection(client, ProtocolVersion.V4);
          Collection<ClientStat> clientIPAndTimes2 = pvt.getAll(ProtocolVersion.V4);
          assertEquals(10, clientIPAndTimes2.size());
  
          long ls1 = clientIPAndTimes1.stream().filter(c -> c.remoteAddress.equals(client)).findFirst().get().lastSeenTime;
          long ls2 = clientIPAndTimes2.stream().filter(c -> c.remoteAddress.equals(client)).findFirst().get().lastSeenTime;
  
          assertTrue(ls2 > ls1);
      }
  
      @Test
      public void addConnection_validConnection_Succeeds()
      {
          ProtocolVersionTracker pvt = new ProtocolVersionTracker();
  
          for(InetAddress addr : getMockConnections(10))
          {
              pvt.addConnection(addr, ProtocolVersion.V4);
          }
  
          for(InetAddress addr : getMockConnections(7))
          {
              pvt.addConnection(addr, ProtocolVersion.V3);
          }
  
          assertEquals(17, pvt.getAll().size());
          assertEquals(0, pvt.getAll(ProtocolVersion.V2).size());
          assertEquals(7, pvt.getAll(ProtocolVersion.V3).size());
          assertEquals(10, pvt.getAll(ProtocolVersion.V4).size());
      }
  
      @Test
      public void clear()
      {
          ProtocolVersionTracker pvt = new ProtocolVersionTracker();
  
          for(InetAddress addr : getMockConnections(7))
          {
              pvt.addConnection(addr, ProtocolVersion.V3);
          }
  
          assertEquals(7, pvt.getAll(ProtocolVersion.V3).size());
          pvt.clear();
  
          assertEquals(0, pvt.getAll(ProtocolVersion.V3).size());
      }
  
      /* Helper */
      private List<InetAddress> getMockConnections(int num)
      {
          return IntStream.range(0, num).mapToObj(n -> {
              try
              {
                  return InetAddress.getByName("127.0.1." + n);
              }
              catch (UnknownHostException e)
              {
                  e.printStackTrace();
              }
              return null;
          }).collect(Collectors.toList());
      }
  }
  