Method Interaction

A method call is a very specific type of interaction between caller and implementer.

• Synchronous—The caller dictates the timing of the request, whereas the implementer is expected to immediately compute a response.
• Arguments-Return Value—The caller can pass many values to the implementer, but the implementer can only pass one value back.
• Identification—The caller must know the identity of the implementer, but the implementer does not know the identity of the caller.

There are many widely used features which adjust the caller-implementer dynamic.

• Async & Futures—The caller may make the request in its own time; the implementer makes the response in its own time.
• Destructuring & Tuples—The implementer can return many values in addition to accepting many arguments.
• Eventing—The implementer must know the identity of the caller, but the caller does not know the identity of the implementer.

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