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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.transport;
  
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  
  public class ProtocolVersionTest
  {
      @BeforeClass
      public static void setupDatabaseDescriptor()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @Before
      public void setUp()
      {
          DatabaseDescriptor.setNativeTransportAllowOlderProtocols(true);
      }
  
      @Test
      public void testDecode()
      {
          for (ProtocolVersion version : ProtocolVersion.SUPPORTED)
              Assert.assertEquals(version, ProtocolVersion.decode(version.asInt(), DatabaseDescriptor.getNativeTransportAllowOlderProtocols()));
  
          for (ProtocolVersion version : ProtocolVersion.UNSUPPORTED)
          { // unsupported old versions
              try
              {
                  Assert.assertEquals(version, ProtocolVersion.decode(version.asInt(), DatabaseDescriptor.getNativeTransportAllowOlderProtocols()));
                  Assert.fail("Expected invalid protocol exception");
              }
              catch (ProtocolException ex)
              {
                  Assert.assertNotNull(ex.getForcedProtocolVersion());
                  Assert.assertEquals(version, ex.getForcedProtocolVersion());
              }
          }
  
          try
          { // unsupported newer version
              Assert.assertEquals(null, ProtocolVersion.decode(63, DatabaseDescriptor.getNativeTransportAllowOlderProtocols()));
              Assert.fail("Expected invalid protocol exception");
          }
          catch (ProtocolException ex)
          {
              // behavior changed in CASSANDRA-16581
              // When an unknown version is seen which is larger than any we know about, we can't try to fall back to the
              // max version as this can cause issues as the channel protocol doesn't match (which gets rejected), so
              // fall back to the channel version.
              Assert.assertNull(ex.getForcedProtocolVersion());
          }
      }
  
      @Test
      public void testSupportedVersions()
      {
          Assert.assertTrue(ProtocolVersion.supportedVersions().size() >= 2); // at least one OS and one DSE
          Assert.assertNotNull(ProtocolVersion.CURRENT);
  
          Assert.assertFalse(ProtocolVersion.V5.isBeta());
          Assert.assertTrue(ProtocolVersion.V6.isBeta());
      }
  
      @Test
      public void testComparisons()
      {
          Assert.assertTrue(ProtocolVersion.V1.isSmallerOrEqualTo(ProtocolVersion.V1));
          Assert.assertTrue(ProtocolVersion.V2.isSmallerOrEqualTo(ProtocolVersion.V2));
          Assert.assertTrue(ProtocolVersion.V3.isSmallerOrEqualTo(ProtocolVersion.V3));
          Assert.assertTrue(ProtocolVersion.V4.isSmallerOrEqualTo(ProtocolVersion.V4));
          Assert.assertTrue(ProtocolVersion.V5.isSmallerOrEqualTo(ProtocolVersion.V5));
          Assert.assertTrue(ProtocolVersion.V6.isSmallerOrEqualTo(ProtocolVersion.V6));
  
          Assert.assertTrue(ProtocolVersion.V1.isGreaterOrEqualTo(ProtocolVersion.V1));
          Assert.assertTrue(ProtocolVersion.V2.isGreaterOrEqualTo(ProtocolVersion.V2));
          Assert.assertTrue(ProtocolVersion.V3.isGreaterOrEqualTo(ProtocolVersion.V3));
          Assert.assertTrue(ProtocolVersion.V4.isGreaterOrEqualTo(ProtocolVersion.V4));
          Assert.assertTrue(ProtocolVersion.V5.isGreaterOrEqualTo(ProtocolVersion.V5));
          Assert.assertTrue(ProtocolVersion.V6.isGreaterOrEqualTo(ProtocolVersion.V6));
  
          Assert.assertTrue(ProtocolVersion.V1.isSmallerThan(ProtocolVersion.V2));
          Assert.assertTrue(ProtocolVersion.V2.isSmallerThan(ProtocolVersion.V3));
          Assert.assertTrue(ProtocolVersion.V3.isSmallerThan(ProtocolVersion.V4));
          Assert.assertTrue(ProtocolVersion.V4.isSmallerThan(ProtocolVersion.V5));
          Assert.assertTrue(ProtocolVersion.V5.isSmallerThan(ProtocolVersion.V6));
  
          Assert.assertFalse(ProtocolVersion.V1.isGreaterThan(ProtocolVersion.V2));
          Assert.assertFalse(ProtocolVersion.V2.isGreaterThan(ProtocolVersion.V3));
          Assert.assertFalse(ProtocolVersion.V3.isGreaterThan(ProtocolVersion.V4));
          Assert.assertFalse(ProtocolVersion.V4.isGreaterThan(ProtocolVersion.V5));
          Assert.assertFalse(ProtocolVersion.V5.isGreaterThan(ProtocolVersion.V6));
  
          Assert.assertTrue(ProtocolVersion.V6.isGreaterThan(ProtocolVersion.V5));
          Assert.assertTrue(ProtocolVersion.V5.isGreaterThan(ProtocolVersion.V4));
          Assert.assertTrue(ProtocolVersion.V4.isGreaterThan(ProtocolVersion.V3));
          Assert.assertTrue(ProtocolVersion.V3.isGreaterThan(ProtocolVersion.V2));
          Assert.assertTrue(ProtocolVersion.V2.isGreaterThan(ProtocolVersion.V1));
  
          Assert.assertFalse(ProtocolVersion.V6.isSmallerThan(ProtocolVersion.V5));
          Assert.assertFalse(ProtocolVersion.V5.isSmallerThan(ProtocolVersion.V4));
          Assert.assertFalse(ProtocolVersion.V4.isSmallerThan(ProtocolVersion.V3));
          Assert.assertFalse(ProtocolVersion.V3.isSmallerThan(ProtocolVersion.V2));
          Assert.assertFalse(ProtocolVersion.V2.isSmallerThan(ProtocolVersion.V1));
      }
  
      @Test
      public void testDisableOldProtocolVersions_Succeeds()
      {
          DatabaseDescriptor.setNativeTransportAllowOlderProtocols(false);
          List<ProtocolVersion> disallowedVersions = ProtocolVersion.SUPPORTED
                                                         .stream()
                                                         .filter(v -> v.isSmallerThan(ProtocolVersion.CURRENT))
                                                         .collect(Collectors.toList());
  
          for (ProtocolVersion version : disallowedVersions)
          {
              try
              {
                  ProtocolVersion.decode(version.asInt(), DatabaseDescriptor.getNativeTransportAllowOlderProtocols());
                  Assert.fail("Expected invalid protocol exception");
              }
              catch (ProtocolException ex)
              {
              }
          }
  
          Assert.assertEquals(ProtocolVersion.CURRENT, ProtocolVersion.decode(ProtocolVersion.CURRENT.asInt(), DatabaseDescriptor.getNativeTransportAllowOlderProtocols()));
      }
  }
  