ProxyBuilder Examples

DynamicProxy Examples

DynamicProxy-V001

Here you will get a DynamicProxy with no additionally functionality. It will only delegate the Method-Calls to the Delegator. The Delegator will be created before the Proxy, because the Instance is part of the Builder-MethodCall.

     final ServiceV001 serviceV001 = DynamicProxyBuilder
         .createBuilder(ServiceV001.class, new ServiceV001Impl())
         .build();

System.out:

• constructed 2015-11-19T13:46:50.438
• Proxy created 2015-11-19T13:46:50.450
• ServiceV001Impl - invoke 2015-11-19T13:46:50.450

DynamicProxy-V002

Here we will extend DynamicProxy-V001 with an PreAction. PreActions are called before every invoke on every method.

    final ServiceV001 serviceV001 = DynamicProxyBuilder
        .createBuilder(ServiceV001.class, new ServiceV001Impl())
        .addIPreAction((original, method, args1) -> {
          System.out.println("PreAction = " + LocalDateTime.now());
        })
        .build();

System.out:

• constructed 2015-11-19T13:49:58.644
• Proxy created 2015-11-19T13:49:58.658
• PreAction = 2015-11-19T13:49:58.658
• ServiceV001Impl - invoke 2015-11-19T13:49:58.658
• PreAction = 2015-11-19T13:49:58.658
• ServiceV001Impl - invoke 2015-11-19T13:49:58.658

DynamicProxy-V003

Now we will use PostActions. PostActions are invoked after the delegator method call.

    final ServiceV001 serviceV001 = DynamicProxyBuilder
        .createBuilder(ServiceV001.class, new ServiceV001Impl())
        .addIPostAction((original, method, args1)
            -> System.out.println("PostAction = " + LocalDateTime.now()))
        .build();

System.out:

• constructed 2015-11-19T13:54:54.453
• Proxy created 2015-11-19T13:54:54.468
• doWork = invoke - 2015-11-19T13:54:54.468
• PostAction = 2015-11-19T13:54:54.468
• ServiceV001Impl - invoke 2015-11-19T13:54:54.468
• doWork = invoke - 2015-11-19T13:54:54.468
• PostAction = 2015-11-19T13:54:54.468
• ServiceV001Impl - invoke 2015-11-19T13:54:54.468

DynamicProxy-V004

You can add Security Rules. This Rule will be executed before every method call. If the Rule will return true, the delegator-method will be invoked.

    final ServiceV001 serviceV001 = DynamicProxyBuilder
        .createBuilder(ServiceV001.class, new ServiceV001Impl())
        .addSecurityRule(() -> {
          System.out.println("checkRule = " + LocalDateTime.now());
          return true;
        })
        .build();

System.out:

• constructed 2015-11-19T13:59:20.751
• Proxy created 2015-11-19T13:59:20.765
• checkRule = 2015-11-19T13:59:20.765
• doWork = invoke - 2015-11-19T13:59:20.765
• ServiceV001Impl - invoke 2015-11-19T13:59:20.766

DynamicProxy-V005

You can add Security Rules. This Rule will be executed before every method call. If the Rule will return false, the delegator-method will not be invoked.

    final ServiceV001 serviceV001 = DynamicProxyBuilder
        .createBuilder(ServiceV001.class, new ServiceV001Impl())
        .addSecurityRule(() -> {
          System.out.println("checkRule = " + LocalDateTime.now());
          return false;
        })
        .build();

System.out:

• constructed 2015-11-19T14:03:57.070
• Proxy created 2015-11-19T14:03:57.084
• checkRule = 2015-11-19T14:03:57.085
• null 2015-11-19T14:03:57.085

DynamicProxy-V006

To add Metrics (Dropwizard) you could use the .addMetrics() Method. Metrics are registered internaly by Dropwizard-Metrics. For every Method there will be a Histogramm.

  public static void main(String[] args) {
    final ServiceV001 serviceV001 = DynamicProxyBuilder
        .createBuilder(ServiceV001.class, new ServiceV006Impl())
        .addMetrics()
        .build();
    System.out.println("Proxy created " + LocalDateTime.now());
    System.out.println(serviceV001.doWork("invoke") + " " + LocalDateTime.now());
    final MetricRegistry metrics = MetricsRegistry.getInstance().getMetrics();
    final ConsoleReporter reporter = ConsoleReporter.forRegistry(metrics)
        .convertRatesTo(TimeUnit.NANOSECONDS)
        .convertDurationsTo(TimeUnit.MILLISECONDS)
        .build();
    reporter.start(1, TimeUnit.SECONDS);
    IntStream.range(0, 10_000_000).forEach(i -> serviceV001.doWork("" + i));
  }

  private static class ServiceV006Impl implements ServiceV001 {
    @Override
    public String doWork(final String txt) {
      return txt;
    }
  }

System.out:

19.11.15 14:11:17 ==============================================================
-- Histograms ------------------------------------------------------------------
  ServiceV001.doWork
               count = 1507936
                 min = 21
                 max = 196
                mean = 38,28
              stddev = 11,58
              median = 36,00
                75% <= 41,00
                95% <= 50,00
                98% <= 59,00
                99% <= 63,00
              99.9% <= 177,00
19.11.15 14:11:18 ==============================================================
-- Histograms ------------------------------------------------------------------
ServiceV001.doWork
             count = 3733355
               min = 21
               max = 168
              mean = 34,93
            stddev = 9,04
            median = 34,00
              75% <= 36,00
              95% <= 45,00
              98% <= 57,00
              99% <= 63,00
            99.9% <= 166,00