Design Pattern Between Two Object's Interaction

Question

I have two objects, ObjectA and ObjectB. ObjectA needs to call events on ObjectB. I was looking for a good design pattern to allow ObjectA to do this, because I don't want to expose public methods for anyone to do this, yet ObjectA really needs to do the work of firing those events.

Is there a good pattern for this, or any advice?

Thanks.

Answer 1

ObjectA needs to call events on ObjectB

well the way you describe it sounds like A sending commands to B, which makes Command pattern a usual suspect.

Also the way to establish close encounters between A and B may turn out complicated enough to justify establishing a separate object C to mediate their interaction - Mediator pattern

Answer 2

If an object needs to call methods from another class, it doesn't really sound like good design to begin with.

Answer 3

Perhaps consider the Observer Pattern. This is usually used when one object needs to receive notification from another object.