It looks like this,

class Invocation {
    public String method;
    public Array<Object> args;
}

Event = Invocation

class Interceptor {
    public Interceptor next;
    public intercept(Invocation v);
    private dispatch(Invocation v);
    private delegate(Invocation v);
    intercept = trigger = execute
}

Interceptor = System = Command

When dealing with legacy code it becomes,

• Wrapper
• Facade
• Adapter
• Proxy
• Mediator
• Command

By composing multiple interceptors with the help of next,

• Decorator
• Delegation
• Chain of Command
• Pipes and Filters
• Front Controller

You can easily use ServiceLocater at various points in the code to simulate AOP and implement Stategy pattern, easily.