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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.io.compress;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Map;
  import java.util.Random;
  import java.util.Set;
  
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  import static org.junit.Assert.assertEquals;
  
  public class CompressedSequentialWriterReopenTest extends CQLTester
  {
      @Test
      public void badCompressor1() throws IOException
      {
          BadCompressor bad = new BadCompressor();
          byte [] test = new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
          byte [] out = new byte[10];
          bad.uncompress(test, 0, 20, out, 0);
          for (int i = 0; i < 10; i++)
              assertEquals(out[i], (byte)i);
      }
  
      @Test
      public void badCompressor2() throws IOException
      {
          BadCompressor bad = new BadCompressor();
          ByteBuffer input = ByteBuffer.wrap(new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19});
          ByteBuffer output = ByteBuffer.allocate(40);
          bad.compress(input, output);
          for (int i = 0; i < 40; i++)
              assertEquals(i % 20, output.get(i));
      }
  
      @Test
      public void badCompressor3() throws IOException
      {
          BadCompressor bad = new BadCompressor();
          ByteBuffer input = ByteBuffer.wrap(new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19});
          ByteBuffer output = ByteBuffer.allocate(10);
          bad.uncompress(input, output);
          for (int i = 0; i < 10; i++)
              assertEquals(i, output.get(i));
      }
  
      @Test
      public void compressionEnabled() throws Throwable
      {
          createTable("create table %s (id int primary key, t blob) with compression = {'class':'org.apache.cassandra.io.compress.CompressedSequentialWriterReopenTest$BadCompressor'}");
          byte [] blob = new byte[1000];
          (new Random()).nextBytes(blob);
          getCurrentColumnFamilyStore().disableAutoCompaction();
          for (int i = 0; i < 10000; i++)
          {
              execute("insert into %s (id, t) values (?, ?)", i, ByteBuffer.wrap(blob));
          }
          flush();
          for (int i = 0; i < 10000; i++)
          {
              execute("insert into %s (id, t) values (?, ?)", i, ByteBuffer.wrap(blob));
          }
          flush();
          DatabaseDescriptor.setSSTablePreemptiveOpenIntervalInMiB(1);
          getCurrentColumnFamilyStore().forceMajorCompaction();
      }
  
      public static class BadCompressor implements ICompressor
      {
          public static ICompressor create(Map<String, String> options)
          {
              return new BadCompressor();
          }
  
          @Override
          public int initialCompressedBufferLength(int chunkLength)
          {
              return chunkLength * 2;
          }
  
          @Override
          public int uncompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset) throws IOException
          {
              System.arraycopy(input, inputOffset, output, outputOffset, inputLength / 2);
              return inputLength / 2;
          }
  
          @Override
          public void compress(ByteBuffer input, ByteBuffer output) throws IOException
          {
              int len = input.remaining();
              byte [] arr = ByteBufferUtil.getArray(input);
              output.put(arr);
              output.put(arr);
              input.position(len);
          }
  
          @Override
          public void uncompress(ByteBuffer input, ByteBuffer output) throws IOException
          {
              byte [] arr = ByteBufferUtil.getArray(input);
              output.put(arr, 0, arr.length / 2);
              input.position(arr.length);
          }
  
          @Override
          public BufferType preferredBufferType()
          {
              return BufferType.ON_HEAP;
          }
  
          @Override
          public boolean supports(BufferType bufferType)
          {
              return true;
          }
  
          @Override
          public Set<String> supportedOptions()
          {
              return null;
          }
      }
  }
  