cglib调用过程

本篇文章不讲cglib如何应用，只从eclipse调试的角度看看从最外层的动态代理类调用到最内层的被代理类，经过了哪些中间步骤。

废话不多说，直接上代码

被代理类:

public class MySubject {
    public void doSomeThing() {
        System.err.println("Do some thing!");
    }    
}

拦截器:

public class CgLibMethodInterceptor implements MethodInterceptor {
	@Override
	public Object intercept(Object target, Method method, Object[] args, MethodProxy proxy) throws Throwable {
		System.err.println("before ");
		Object result = proxy.invokeSuper(target, args);
		System.err.println("after " + result);
		return result;
	}

}

测试cglib动态代理：

public class CglibProxyWriter {
	public static void main(String[] args) {
		System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, "D:\\cglib-class\\");
		MySubject subject= (MySubject) Enhancer.create(MySubject.class,new CgLibMethodInterceptor());		
		subject.doSomeThing();
	}
}

从调用栈可以清晰的看到最外层到最内层的调用逻辑。

MySubject$$EnhancerByCGLIB$$24226c3c(MySubject).doSomeThing() line: 6
MySubject$$EnhancerByCGLIB$$24226c3c.CGLIB$doSomeThing$0() line: not available
MySubject$$EnhancerByCGLIB$$24226c3c$$FastClassByCGLIB$$a7941ac2.invoke(int, Object, Object[]) line: not available
MethodProxy.invokeSuper(Object, Object[]) line: 244
CgLibMethodInterceptor.intercept(Object, Method, Object[], MethodProxy) line: 14
MySubject$$EnhancerByCGLIB$$24226c3c.doSomeThing() line: not available
CglibProxyWriter.main(String[]) line: 16

MySubject$$EnhancerByCGLIB$$24226c3c(MySubject).doSomeThing() line: 6

MySubject$$EnhancerByCGLIB$$24226c3c.CGLIB$doSomeThing$0() line: not available

MySubject$$EnhancerByCGLIB$$24226c3c$$FastClassByCGLIB$$a7941ac2.invoke(int, Object, Object[]) line: not available

MethodProxy.invokeSuper(Object, Object[]) line: 244

CgLibMethodInterceptor.intercept(Object, Method, Object[], MethodProxy) line: 14

MySubject$$EnhancerByCGLIB$$24226c3c.doSomeThing() line: not available

CglibProxyWriter.main(String[]) line: 16

eclipse调试的时候不能加上断点，cglib动态生成的代理类需要反编译工具查看，截图已经提供了反编译后的代码。

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