Java 深度拷贝测试

Java 深度拷贝测试

测试选择了两种深度拷贝的方式

• Object Stream
• fast-serialization

fast-serialization 是一个开源的高性能的序列化库。

RuedigerMoeller/fast-serialization

使用 idea 新建一个 maven 项目，引入需要的开源工具 JMH 和上面的 fast-serialization。

    
      junit
      junit
      4.11
      test
    

    
      org.openjdk.jmh
      jmh-core
      1.25.2
    

    
      org.openjdk.jmh
      jmh-generator-annprocess
      1.25.2
      provided
    

    
      de.ruedigermoeller
      fst
      2.57
    

使用 Object Stream 和 fast-serialization 写出两个深度拷贝的方法

public class DeepCopyUtils {

    private static FSTConfiguration configuration = FSTConfiguration.createDefaultConfiguration();

    public static  T fstDeepCopy(T src) {
        return configuration.deepCopy(src);
    }

    public static  T deepCopy(T src) {
        try {
            ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
            ObjectOutputStream out = new ObjectOutputStream(byteOut);
            out.writeObject(src);

            ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray());
            ObjectInputStream in = new ObjectInputStream(byteIn);

            return (T)in.readObject();
        } catch ( Exception e) {

        }
        return null;
    }

}

使用 JMH 写一个基准测试类

@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 10)
@Measurement(iterations = 50, time = 3, timeUnit = TimeUnit.SECONDS)
@Threads(8)
@Fork(2)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public class DeepCopyBenchmark {

    private static UserData userData = new UserData();

    static {
        userData.setBetCoins(1000000L);

        List modes = new ArrayList<>();
        modes.add("DEEP");
        modes.add("COPY");
        userData.setModes(modes);

        List