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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.service.accord;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.nio.ByteBuffer;
  import java.nio.file.Files;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import accord.primitives.TxnId;
  import accord.utils.AccordGens;
  import accord.utils.Gen;
  import accord.utils.Gens;
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.config.CassandraRelevantProperties;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.io.util.DataInputBuffer;
  import org.apache.cassandra.io.util.DataOutputBuffer;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.service.StorageService;
  import org.apache.cassandra.utils.AsymmetricOrdering;
  import org.apache.cassandra.utils.FBUtilities;
  import org.apache.cassandra.utils.FBUtilities.Order;
  import org.apache.cassandra.utils.StorageCompatibilityMode;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import static accord.utils.Property.qt;
  import static org.assertj.core.api.Assertions.assertThat;
  
  public class AccordJournalTest
  {
      @BeforeClass
      public static void setCompatibilityMode() throws IOException
      {
          CassandraRelevantProperties.TEST_STORAGE_COMPATIBILITY_MODE.setEnum(StorageCompatibilityMode.NONE);
  
          ServerTestUtils.daemonInitialization();
          StorageService.instance.registerMBeans();
          StorageService.instance.setPartitionerUnsafe(Murmur3Partitioner.instance);
          ServerTestUtils.prepareServerNoRegister();
  
          File directory = new File(Files.createTempDirectory(null));
          directory.deleteRecursiveOnExit();
          DatabaseDescriptor.setAccordJournalDirectory(directory.path());
          StorageService.instance.initServer();
          Keyspace.setInitialized();
      }
  
      @Test
      public void keySerde()
      {
          DataOutputBuffer buffer = new DataOutputBuffer();
          qt().forAll(keyGen()).check(key ->
          {
              buffer.clear();
              int expectedSize = JournalKey.SUPPORT.serializedSize(1);
              JournalKey.SUPPORT.serialize(key, buffer, 1);
              assertThat(buffer.getLength()).isEqualTo(expectedSize);
              try (DataInputBuffer input = new DataInputBuffer(buffer.unsafeGetBufferAndFlip(), false))
              {
                  JournalKey read = JournalKey.SUPPORT.deserialize(input, 1);
                  assertThat(read).isEqualTo(key);
              }
          });
      }
  
      @Test
      public void compareKeys()
      {
          qt().forAll(Gens.lists(keyGen()).ofSizeBetween(2, 100)).check(keys ->
          {
              keys.sort(JournalKey.SUPPORT);
  
              List<ByteBuffer> buffers = new ArrayList<>(keys.size());
              for (JournalKey k : keys) buffers.add(toBuffer(k));
  
              for (int i = 0; i < keys.size(); i++)
              {
                  JournalKey outerKey = keys.get(i);
                  for (int j = 0; j < keys.size(); j++)
                  {
                      JournalKey innerKey = keys.get(j);
                      ByteBuffer innerBuffer = buffers.get(j);
                      Order expected = FBUtilities.compare(outerKey, innerKey, JournalKey.SUPPORT);
                      Order actual = FBUtilities.compare(outerKey, innerBuffer, new AsymmetricOrdering<JournalKey, ByteBuffer>()
                      {
                          @Override
                          public int compareAsymmetric(JournalKey left, ByteBuffer right)
                          {
                              return JournalKey.SUPPORT.compareWithKeyAt(left, right, 0, 1);
                          }
  
                          @Override
                          public int compare(@Nullable JournalKey left, @Nullable JournalKey right)
                          {
                              throw new UnsupportedOperationException();
                          }
                      });
                      assertThat(actual).isEqualTo(expected);
                  }
              }
          });
      }
  
      private static ByteBuffer toBuffer(JournalKey k)
      {
          try (DataOutputBuffer buffer = new DataOutputBuffer(JournalKey.SUPPORT.serializedSize(1)))
          {
              JournalKey.SUPPORT.serialize(k, buffer, 1);
              return buffer.unsafeGetBufferAndFlip();
          }
          catch (IOException e)
          {
              throw new UncheckedIOException(e);
          }
      }
  
      private Gen<JournalKey> keyGen()
      {
          Gen<TxnId> txnIdGen = AccordGens.txnIds();
          return rs -> new JournalKey(txnIdGen.next(rs), JournalKey.Type.COMMAND_DIFF, 0);
      }
  }
  