gistfile1.java

public class BenchmarkProxyManager implements InvocationHandler {

    private Benchmark o;

    public BenchmarkProxyManager(Benchmark o) {
        this.o = o;
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        final StopWatch sw = Provider.buildNewStopWatch();
        sw.start();
        Object o = method.invoke(this.o, args);
        sw.stop();
        System.out.println(method.getName() + ": " + sw.getTime() + " ms");
        sw.reset();

        return o;

    }


    public static Benchmark getProxiedClass(Class<? extends Benchmark> clazz) {
        Benchmark benchmark = null;
        try {
            benchmark = (Benchmark) Proxy.newProxyInstance(
                    Benchmark.class.getClassLoader(),
                    new Class[]{Benchmark.class},
                    new BenchmarkProxyManager(clazz.newInstance()));
        } catch (Exception e) {
            e.printStackTrace();
        }

        return benchmark;
    }

}