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.streaming.async;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.ReadableByteChannel;
  import java.util.Random;
  
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.buffer.PooledByteBufAllocator;
  import io.netty.buffer.Unpooled;
  import net.jpountz.lz4.LZ4Compressor;
  import net.jpountz.lz4.LZ4Factory;
  import net.jpountz.lz4.LZ4SafeDecompressor;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.io.util.DataInputBuffer;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.utils.memory.MemoryUtil;
  
  public class StreamCompressionSerializerTest
  {
      private static final int VERSION = MessagingService.current_version;
      private static final Random random = new Random(2347623847623L);
  
      private final ByteBufAllocator allocator = PooledByteBufAllocator.DEFAULT;
      private final StreamCompressionSerializer serializer = new StreamCompressionSerializer(allocator);
      private final LZ4Compressor compressor = LZ4Factory.fastestInstance().fastCompressor();
      private final LZ4SafeDecompressor decompressor = LZ4Factory.fastestInstance().safeDecompressor();
  
      private ByteBuffer input;
      private ByteBuffer compressed;
      private ByteBuf output;
  
      @BeforeClass
      public static void before()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @After
      public void tearDown()
      {
          if (input != null)
              MemoryUtil.clean(input);
          if (compressed != null)
              MemoryUtil.clean(compressed);
          if (output != null && output.refCnt() > 0)
              output.release(output.refCnt());
      }
  
      @Test
      public void roundTrip_HappyPath_NotReadabaleByteBuffer() throws IOException
      {
          populateInput();
          StreamCompressionSerializer.serialize(compressor, input, VERSION).write(size -> compressed = ByteBuffer.allocateDirect(size));
          input.flip();
          output = serializer.deserialize(decompressor, new DataInputBuffer(compressed, false), VERSION);
          validateResults();
      }
  
      private void populateInput()
      {
          int bufSize = 1 << 14;
          input = ByteBuffer.allocateDirect(bufSize);
          for (int i = 0; i < bufSize; i += 4)
              input.putInt(random.nextInt());
          input.flip();
      }
  
      private void validateResults()
      {
          Assert.assertEquals(input.remaining(), output.readableBytes());
          for (int i = 0; i < input.remaining(); i++)
              Assert.assertEquals(input.get(i), output.readByte());
      }
  
      @Test
      public void roundTrip_HappyPath_ReadabaleByteBuffer() throws IOException
      {
          populateInput();
          StreamCompressionSerializer.serialize(compressor, input, VERSION)
                                     .write(size -> {
                                         if (compressed != null)
                                             MemoryUtil.clean(compressed);
                                         return compressed = ByteBuffer.allocateDirect(size);
                                     });
          input.flip();
          output = serializer.deserialize(decompressor, new ByteBufRCH(Unpooled.wrappedBuffer(compressed)), VERSION);
          validateResults();
      }
  
      private static class ByteBufRCH extends DataInputBuffer implements ReadableByteChannel
      {
          public ByteBufRCH(ByteBuf compressed)
          {
              super (compressed.nioBuffer(0, compressed.readableBytes()), false);
          }
  
          @Override
          public int read(ByteBuffer dst) throws IOException
          {
              int len = dst.remaining();
              dst.put(buffer);
              return len;
          }
  
          @Override
          public boolean isOpen()
          {
              return true;
          }
      }
  }
  