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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.journal;
  
  import java.io.IOException;
  import java.nio.file.Files;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.utils.TimeUUID;
  
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  import static org.junit.Assert.assertEquals;
  
  public class JournalTest
  {
      @BeforeClass
      public static void setUp()
      {
          DatabaseDescriptor.daemonInitialization();
          ServerTestUtils.prepareServer();
      }
  
      @Test
      public void testSimpleReadWrite() throws IOException
      {
          File directory = new File(Files.createTempDirectory("JournalTest"));
          directory.deleteRecursiveOnExit();
  
          Journal<TimeUUID, Long> journal =
              new Journal<>("TestJournal", directory, TestParams.INSTANCE, TimeUUIDKeySupport.INSTANCE, LongSerializer.INSTANCE, SegmentCompactor.noop());
  
          journal.start();
  
          TimeUUID id1 = nextTimeUUID();
          TimeUUID id2 = nextTimeUUID();
          TimeUUID id3 = nextTimeUUID();
          TimeUUID id4 = nextTimeUUID();
  
          journal.blockingWrite(id1, 1L);
          journal.blockingWrite(id2, 2L);
          journal.blockingWrite(id3, 3L);
          journal.blockingWrite(id4, 4L);
  
          assertEquals(1L, (long) journal.readLast(id1));
          assertEquals(2L, (long) journal.readLast(id2));
          assertEquals(3L, (long) journal.readLast(id3));
          assertEquals(4L, (long) journal.readLast(id4));
  
          journal.shutdown();
  
          journal = new Journal<>("TestJournal", directory, TestParams.INSTANCE, TimeUUIDKeySupport.INSTANCE, LongSerializer.INSTANCE, SegmentCompactor.noop());
          journal.start();
  
          assertEquals(1L, (long) journal.readLast(id1));
          assertEquals(2L, (long) journal.readLast(id2));
          assertEquals(3L, (long) journal.readLast(id3));
          assertEquals(4L, (long) journal.readLast(id4));
  
          journal.shutdown();
      }
  
      static class LongSerializer implements ValueSerializer<TimeUUID, Long>
      {
          static final LongSerializer INSTANCE = new LongSerializer();
  
          public int serializedSize(TimeUUID key, Long value, int userVersion)
          {
              return Long.BYTES;
          }
  
          public void serialize(TimeUUID key, Long value, DataOutputPlus out, int userVersion) throws IOException
          {
              out.writeLong(value);
          }
  
          public Long deserialize(TimeUUID key, DataInputPlus in, int userVersion) throws IOException
          {
              return in.readLong();
          }
      }
  }
  