Package ru.vyarus.dropwizard.guice.test.track

Class TrackerProxy<T>

java.lang.Object

ru.vyarus.dropwizard.guice.test.track.TrackerProxy<T>

Type Parameters:

T - bean type

All Implemented Interfaces:

org.aopalliance.aop.Advice, org.aopalliance.intercept.Interceptor, org.aopalliance.intercept.MethodInterceptor

public class TrackerProxy<T>
extends Object
implements org.aopalliance.intercept.MethodInterceptor

AOP interceptor redirect calls from the real bean into spy object, which was created around the same real bean.

There is a chicken-egg problem: service binding can't be overridden (with spy instance), because spy requires service instance for construction. So, instead of replacing bean, we intercept bean calls. Actual spy object is created lazily just after injector creation. On the first call, AOP interceptor breaks the current aop chain (if other interceptors registered) and redirect calls to spy, which again calls the same service (including aop handler), but, this time, it processes normally.

Constructor Summary

Constructors

Constructor	Description
TrackerProxy(Class<T> type, TrackerConfig config, com.codahale.metrics.MetricRegistry metrics)	Create proxy.

Method Summary

Modifier and Type	Method	Description
Tracker<T>	getTracker()
Object	invoke(org.aopalliance.intercept.MethodInvocation methodInvocation)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

TrackerProxy

public TrackerProxy(Class<T> type,
 TrackerConfig config,
 com.codahale.metrics.MetricRegistry metrics)

Create proxy.

Parameters:

type - service type

config - config

metrics - metrics

Method Details

getTracker

public Tracker<T> getTracker()

Returns:

tracker instance

invoke

public Object invoke(org.aopalliance.intercept.MethodInvocation methodInvocation)
              throws Throwable

Specified by:

invoke in interface org.aopalliance.intercept.MethodInterceptor

Throws:

Throwable