Implicit invocation is a term used by some authors for a style of software architecture in which a system is structured around event handling, using a form of callback.
It is closely related to inversion of control and what is known informally as the Hollywood principle.
The idea behind implicit invocation is that instead of invoking a procedure directly, a component can announce (or broadcast) one or more events.
Thus an event announcement implicitly causes the invocation of procedures in other modules.Implicit invocation is the core technique behind the observer pattern.
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