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.db.commitlog;
  
  import org.apache.cassandra.io.util.File;
  import java.io.IOException;
  
  import com.google.common.base.Predicate;
  import org.junit.Assert;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.db.rows.DeserializationHelper;
  import org.apache.cassandra.io.util.DataInputBuffer;
  import org.apache.cassandra.io.util.RebufferingInputStream;
  
  /**
   * Utility class for tests needing to examine the commitlog contents.
   */
  public class CommitLogTestReplayer extends CommitLogReplayer
  {
      private final Predicate<Mutation> processor;
  
      public CommitLogTestReplayer(Predicate<Mutation> processor) throws IOException
      {
          super(CommitLog.instance, CommitLogPosition.NONE, null, ReplayFilter.create());
          CommitLog.instance.sync(true);
  
          this.processor = processor;
          commitLogReader = new CommitLogTestReader();
      }
  
      public void examineCommitLog() throws IOException
      {
          replayFiles(new File(DatabaseDescriptor.getCommitLogLocation()).tryList());
      }
  
      private class CommitLogTestReader extends CommitLogReader
      {
          @Override
          protected void readMutation(CommitLogReadHandler handler,
                                      byte[] inputBuffer,
                                      int size,
                                      CommitLogPosition minPosition,
                                      final int entryLocation,
                                      final CommitLogDescriptor desc) throws IOException
          {
              RebufferingInputStream bufIn = new DataInputBuffer(inputBuffer, 0, size);
              Mutation mutation;
              try
              {
                  mutation = Mutation.serializer.deserialize(bufIn, desc.getMessagingVersion(), DeserializationHelper.Flag.LOCAL);
                  Assert.assertTrue(processor.apply(mutation));
              }
              catch (IOException e)
              {
                  // Test fails.
                  throw new AssertionError(e);
              }
          }
      }
  }
  