Package net.jpountz.lz4

Examples of net.jpountz.lz4.LZ4Factory

Only the {@link #safeInstance() safe instance} is guaranteed to work on yourJVM, as a consequence it is advised to use the {@link #fastestInstance()} or{@link #fastestJavaInstance()} to pull a {@link LZ4Factory} instance.

All methods from this class are very costly, so you should get an instance once, and then reuse it whenever possible. This is typically done by storing a {@link LZ4Factory} instance in a static field.

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                        out = new DataOutputStreamPlus(new SnappyOutputStream(socket.getOutputStream()));
                    }
                    else
                    {
                        // TODO: custom LZ4 OS that supports BB write methods
                        LZ4Compressor compressor = LZ4Factory.fastestInstance().fastCompressor();
                        Checksum checksum = XXHashFactory.fastestInstance().newStreamingHash32(LZ4_HASH_SEED).asChecksum();
                        out = new DataOutputStreamPlus(new LZ4BlockOutputStream(socket.getOutputStream(),
                                                                            1 << 14,  // 16k block size
                                                                            compressor,
                                                                            checksum,
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                    {
                        out = new DataOutputStream(new SnappyOutputStream(new BufferedOutputStream(socket.getOutputStream())));
                    }
                    else
                    {
                        LZ4Compressor compressor = LZ4Factory.fastestInstance().fastCompressor();
                        Checksum checksum = XXHashFactory.fastestInstance().newStreamingHash32(LZ4_HASH_SEED).asChecksum();
                        out = new DataOutputStream(new LZ4BlockOutputStream(new BufferedOutputStream(socket.getOutputStream()),
                                                                            1 << 14,  // 16k block size
                                                                            compressor,
                                                                            checksum,
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   @Override
   public byte[] getBytes(Object obj) {
      final LZ4Factory factory = lz4Factory.get();
      byte[] data = codecUncompressed.getBytes(obj);
      final int decompressedLength = data.length;
      LZ4Compressor compressor = factory.fastCompressor();
      int maxCompressedLength = compressor.maxCompressedLength(decompressedLength);
      byte[] compressed = new byte[4 + maxCompressedLength];
      compressor.compress(data, 0, decompressedLength, compressed, 4, maxCompressedLength);
      return compressed;
   }
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      byte[] data = codecUncompressed.getBytes(obj);
      final int decompressedLength = data.length;

      // compress data
      LZ4Compressor compressor = factory.fastCompressor();
      int maxCompressedLength = compressor.maxCompressedLength(decompressedLength);
      byte[] compressed = new byte[8 + maxCompressedLength];
      int compressedLength = compressor.compress(data, 0, decompressedLength, compressed, 8, maxCompressedLength);

      // tcpreceiver decoder expects | x = message length (4B) | message    (x bytes)                           |
      // we are providing            | x = y + 4          (4B) | dec length (4 bytes) | comp. message (y bytes) |
      //
      //
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  {
    if (in == null) {
      throw new NullPointerException("Can't compress null");
    }

    LZ4Compressor compressor = lz4Factory.fastCompressor();

    byte[] out = new byte[compressor.maxCompressedLength(in.length)];
    int compressedLength = compressor.compress(in, 0, in.length, out, 0);

    getLogger().debug("Compressed %d bytes to %d", in.length, compressedLength);

    return ByteBuffer.allocate(Ints.BYTES + compressedLength)
                     .putInt(in.length)
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                        out = new DataOutputStreamPlus(new SnappyOutputStream(socket.getOutputStream()));
                    }
                    else
                    {
                        // TODO: custom LZ4 OS that supports BB write methods
                        LZ4Compressor compressor = LZ4Factory.fastestInstance().fastCompressor();
                        Checksum checksum = XXHashFactory.fastestInstance().newStreamingHash32(LZ4_HASH_SEED).asChecksum();
                        out = new DataOutputStreamPlus(new LZ4BlockOutputStream(socket.getOutputStream(),
                                                                            1 << 14,  // 16k block size
                                                                            compressor,
                                                                            checksum,
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                        out = new DataOutputStreamPlus(new SnappyOutputStream(socket.getOutputStream()));
                    }
                    else
                    {
                        // TODO: custom LZ4 OS that supports BB write methods
                        LZ4Compressor compressor = LZ4Factory.fastestInstance().fastCompressor();
                        Checksum checksum = XXHashFactory.fastestInstance().newStreamingHash32(LZ4_HASH_SEED).asChecksum();
                        out = new DataOutputStreamPlus(new LZ4BlockOutputStream(socket.getOutputStream(),
                                                                            1 << 14,  // 16k block size
                                                                            compressor,
                                                                            checksum,
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  @Override
  protected byte[] decompress(byte[] in)
  {
    byte[] out = null;
    if(in != null) {
      LZ4Decompressor decompressor = lz4Factory.decompressor();

      int size = ByteBuffer.wrap(in).getInt();

      out = new byte[size];
      decompressor.decompress(in, Ints.BYTES, out, 0, out.length);
    }
    return out == null ? null : out;
  }
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  public static void main(String[] args) throws Exception {
    example();
  }

  private static void example() throws UnsupportedEncodingException {
    LZ4Factory factory = LZ4Factory.fastestInstance();

    byte[] data = "12345345234572".getBytes("UTF-8");
    final int decompressedLength = data.length;

    // compress data
    LZ4Compressor compressor = factory.fastCompressor();
    int maxCompressedLength = compressor.maxCompressedLength(decompressedLength);
    byte[] compressed = new byte[maxCompressedLength];
    int compressedLength = compressor.compress(data, 0, decompressedLength, compressed, 0, maxCompressedLength);

    // decompress data
    // - method 1: when the decompressed length is known
    LZ4FastDecompressor decompressor = factory.fastDecompressor();
    byte[] restored = new byte[decompressedLength];
    int compressedLength2 = decompressor.decompress(compressed, 0, restored, 0, decompressedLength);
    // compressedLength == compressedLength2

    // - method 2: when the compressed length is known (a little slower)
    // the destination buffer needs to be over-sized
    LZ4SafeDecompressor decompressor2 = factory.safeDecompressor();
    int decompressedLength2 = decompressor2.decompress(compressed, 0, compressedLength, restored, 0);
    // decompressedLength == decompressedLength2
  }
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        private static final int INTEGER_BYTES = 4;
        private final net.jpountz.lz4.LZ4Compressor compressor;
        private final net.jpountz.lz4.LZ4FastDecompressor decompressor;

        private LZ4Compressor() {
            final LZ4Factory lz4Factory = LZ4Factory.fastestInstance();
            compressor = lz4Factory.fastCompressor();
            decompressor = lz4Factory.fastDecompressor();
        }
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