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From leighst <...@git.apache.org>
Subject [GitHub] incubator-distributedlog pull request #106: DL-179: Support ZStandard Compre...
Date Tue, 31 Jan 2017 15:35:39 GMT
Github user leighst commented on a diff in the pull request:

    https://github.com/apache/incubator-distributedlog/pull/106#discussion_r98694134
  
    --- Diff: distributedlog-protocol/src/main/java/org/apache/distributedlog/io/ZstdCompressionCodec.java
---
    @@ -0,0 +1,79 @@
    +/**
    + * 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.distributedlog.io;
    +
    +import com.github.luben.zstd.Zstd;
    +import com.google.common.base.Stopwatch;
    +import java.util.Arrays;
    +import java.util.concurrent.TimeUnit;
    +import org.apache.bookkeeper.stats.OpStatsLogger;
    +
    +/**
    + * ZStandard Compression Codec.
    + *
    + * {@link http://facebook.github.io/zstd/}
    + */
    +public class ZstdCompressionCodec implements CompressionCodec {
    +
    +    public ZstdCompressionCodec() {}
    +
    +    byte[] getOrCopyData(byte[] data, int offset, int length) {
    +        byte[] copyOfData;
    +        if (0 == offset && length == data.length) {
    +            copyOfData = data;
    +        } else {
    +            copyOfData = Arrays.copyOfRange(data, offset, offset + length);
    +        }
    +        return copyOfData;
    +    }
    +
    +    @Override
    +    public byte[] compress(byte[] data, int offset, int length, OpStatsLogger compressionStat)
{
    +        Stopwatch watch = Stopwatch.createStarted();
    +        // TODO: make the compression level configurable.
    +        byte[] compressed = Zstd.compress(getOrCopyData(data, offset, length), 3);
    +
    +        compressionStat.registerSuccessfulEvent(watch.elapsed(TimeUnit.MICROSECONDS));
    +        return compressed;
    +    }
    +
    +    @Override
    +    public byte[] decompress(byte[] data, int offset, int length, OpStatsLogger decompressionStat)
{
    +        Stopwatch watch = Stopwatch.createStarted();
    +        byte[] compressedData = getOrCopyData(data, offset, length);
    +        int decompressedSize = (int) Zstd.decompressedSize(compressedData);
    +        byte[] decompressedData = new byte[decompressedSize];
    +        // TODO: make the compression level configurable.
    --- End diff --
    
    per DL-128, can we try to either tag such TODOs with jira tickets (or just avoid them
if not necessary)?


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