dynamic-proxy

I want to define a method interceptor in a Java program in other words I want to have a behaviour which is executed at each method call. This application isn't executed in an application server and therefore I can't use the EJB around invoke interceptors. I have found a nice Proxy API in the standard Java libraries but its limited because it needs an interface in the proxy creation: Foo f = (Foo) Proxy.newProxyInstance(Foo.class.getClassLoader(), new Class[] { Foo.class }, handler); Is there a similar API which doesn't force Foo.class to be declared as an interface? Why not use CGLIB ? See

I have run into a bit of (what I think is) strange behaviour when using Castle's Dynamic Proxy. With the following code: class Program { static void Main(string[] args) { var c = new InterceptedClass(); var i = new Interceptor(); var cp = new ProxyGenerator().CreateClassProxyWithTarget(c, i); cp.Method1(); cp.Method2(); Console.ReadLine(); } } public class Interceptor : IInterceptor { public void Intercept(IInvocation invocation) { Console.WriteLine(string.Format("Intercepted call to: " + invocation.Method.Name)); invocation.Proceed(); } } public class InterceptedClass { public virtual void

What is a use case for using a dynamic proxy? How do they relate to bytecode generation and reflection? Any recommended reading? xiaojieaa I highly recommend this resource . First of all, you must understand what the proxy pattern use case. Remember that the main intent of a proxy is to control access to the target object, rather than to enhance the functionality of the target object. The access control includes synchronization, authentication, remote access (RPC), lazy instantiation (Hibernate, Mybatis), AOP (transaction). In contrast with static proxy, the dynamic proxy generates bytecode

I'd like to have property getters and methods that I can decorate with my own custom attribute and based on the presence of that attribute replace the method bodies with a different implementation. Also, that different implementation will need to know the constructor arguments given to the custom attribute where it decorates the method. This can obviously be done with AOP, like PostSharp or LinFu, but I'm wondering if there's a way to do this that does not involve a post-build processing step because adding that complicates the project more than I would prefer. Using the traditional .Net APIs

In case of the Proxy Design Pattern , What is the difference between JDK's Dynamic Proxy and third party dynamic code generation API s such as CGLib ? What is the difference between using both the approaches and when should one prefer one over another? JDK Dynamic proxy can only proxy by interface (so your target class needs to implement an interface, which is then also implemented by the proxy class). CGLIB (and javassist) can create a proxy by subclassing. In this scenario the proxy becomes a subclass of the target class. No need for interfaces. So Java Dynamic proxies can proxy: public

Could someone offer up some advice or point out some blogs/articles that could help with making this decision? The proxies seem very foreign to me and I'm hesitant to use them. I like the ability to control Lazy Loading by using virtual properties in my model, but that's pretty much all the benefits that I can see. My application is a simple MVC web application and I don't need to wire up any hooks into the context for when the entities experience a changed state. Anyway, here's my very limited list of pros and cons right now, let me know if I'm off base with any of this. Pros On 'Save' or