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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.batchlog;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.db.RowUpdateBuilder;
  import org.apache.cassandra.db.marshal.BytesType;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.io.util.DataInputBuffer;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputBuffer;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.utils.FBUtilities;
  import org.apache.cassandra.utils.TimeUUID;
  
  import static org.apache.cassandra.utils.ByteBufferUtil.bytes;
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  import static org.junit.Assert.assertEquals;
  
  public class BatchlogTest
  {
      private static final String KEYSPACE = "BatchRequestTest";
      private static final String CF_STANDARD = "Standard";
  
      @BeforeClass
      public static void defineSchema() throws ConfigurationException
      {
          SchemaLoader.prepareServer();
          SchemaLoader.createKeyspace(KEYSPACE,
                                      KeyspaceParams.simple(1),
                                      SchemaLoader.standardCFMD(KEYSPACE, CF_STANDARD, 1, BytesType.instance));
      }
  
      @Test
      public void testSerialization() throws IOException
      {
          TableMetadata cfm = Keyspace.open(KEYSPACE).getColumnFamilyStore(CF_STANDARD).metadata();
  
          long now = FBUtilities.timestampMicros();
          int version = MessagingService.current_version;
          TimeUUID uuid = nextTimeUUID();
  
          List<Mutation> mutations = new ArrayList<>(10);
          for (int i = 0; i < 10; i++)
          {
              mutations.add(new RowUpdateBuilder(cfm, FBUtilities.timestampMicros(), bytes(i))
                            .clustering("name" + i)
                            .add("val", "val" + i)
                            .build());
          }
  
          Batch batch1 = Batch.createLocal(uuid, now, mutations);
          assertEquals(uuid, batch1.id);
          assertEquals(now, batch1.creationTime);
          assertEquals(mutations, batch1.decodedMutations);
  
          DataOutputBuffer out = new DataOutputBuffer();
          Batch.serializer.serialize(batch1, out, version);
  
          assertEquals(out.getLength(), Batch.serializer.serializedSize(batch1, version));
  
          DataInputPlus dis = new DataInputBuffer(out.getData());
          Batch batch2 = Batch.serializer.deserialize(dis, version);
  
          assertEquals(batch1.id, batch2.id);
          assertEquals(batch1.creationTime, batch2.creationTime);
          assertEquals(batch1.decodedMutations.size(), batch2.encodedMutations.size());
  
          Iterator<Mutation> it1 = batch1.decodedMutations.iterator();
          Iterator<ByteBuffer> it2 = batch2.encodedMutations.iterator();
          while (it1.hasNext())
          {
              try (DataInputBuffer in = new DataInputBuffer(it2.next().array()))
              {
                  assertEquals(it1.next().toString(), Mutation.serializer.deserialize(in, version).toString());
              }
          }
      }
  }
  