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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            }
            else
            {
                LZ4FastDecompressor decompressor = LZ4Factory.fastestInstance().fastDecompressor();
                Checksum checksum = XXHashFactory.fastestInstance().newStreamingHash32(OutboundTcpConnection.LZ4_HASH_SEED).asChecksum();
                in = new DataInputStream(new LZ4BlockInputStream(socket.getInputStream(),
                                                                 decompressor,
                                                                 checksum));
            }
        }
        else
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                in = new DataInputStream(new SnappyInputStream(socket.getInputStream()));
            else
            {
                LZ4FastDecompressor decompressor = LZ4Factory.fastestInstance().fastDecompressor();
                Checksum checksum = XXHashFactory.fastestInstance().newStreamingHash32(OutboundTcpConnection.LZ4_HASH_SEED).asChecksum();
                in = new DataInputStream(new LZ4BlockInputStream(socket.getInputStream(),
                                                                 decompressor,
                                                                 checksum));
            }
        }
        else
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        byte[] compressed = new byte[out.readableBytes()];
        out.readBytes(compressed);
        out.release();

        ByteArrayInputStream is = new ByteArrayInputStream(compressed);
        LZ4BlockInputStream lz4Is = new LZ4BlockInputStream(is);
        byte[] uncompressed = new byte[originalLength];
        int remaining = originalLength;
        while (remaining > 0) {
            int read = lz4Is.read(uncompressed, originalLength - remaining, remaining);
            if (read > 0) {
                remaining -= read;
            } else {
                break;
            }
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                    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,
                                                                            true)); // no async flushing
                    }
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                    }
                    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,
                                                                            true)); // no async flushing
                    }
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                    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,
                                                                            true)); // no async flushing
                    }
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                    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,
                                                                            true)); // no async flushing
                    }
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        }
    }

    private static void testDecompression(final EmbeddedChannel channel, final byte[] data) throws Exception {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        LZ4BlockOutputStream lz4Os = new LZ4BlockOutputStream(os, randomBlockSize());
        lz4Os.write(data);
        lz4Os.close();

        ByteBuf compressed = Unpooled.wrappedBuffer(os.toByteArray());
        channel.writeInbound(compressed);

        ByteBuf uncompressed = readUncompressed(channel);
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    @Test
    public void testDecompressionOfBatchedFlowOfData() throws Exception {
        final byte[] data = BYTES_LARGE;

        ByteArrayOutputStream os = new ByteArrayOutputStream();
        LZ4BlockOutputStream lz4Os = new LZ4BlockOutputStream(os, randomBlockSize());
        lz4Os.write(data);
        lz4Os.close();

        final byte[] compressedArray = os.toByteArray();
        int written = 0, length = rand.nextInt(100);
        while (written + length < compressedArray.length) {
            ByteBuf compressed = Unpooled.wrappedBuffer(compressedArray, written, length);
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    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];
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Related Classes of net.jpountz.lz4.LZ4Factory

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  • io.netty.handler.codec.compression.Lz4FrameDecoderTest
  • io.netty.handler.codec.compression.Lz4FrameEncoderTest
  • net.jpountz.example.LZ4Example
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  • org.apache.cassandra.net.OutboundTcpConnection
  • org.apache.cassandra.transport.FrameCompressor$LZ4Compressor
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