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Proactor pattern
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<p>Proactor is a <a href="/facts/Design_pattern_(computer_science)/mV7r4egw">software design pattern</a> for <a href="/facts/Event_handling/0YdM6AoB">event handling</a> in which long running activities are running in an asynchronous part. A <i>completion handler</i> is called after the asynchronous part has terminated. The proactor pattern can be considered to be an asynchronous variant of the <a href="/facts/Synchronization_(computer_science)/n7ID76uM">synchronous</a> <a href="/facts/Reactor_pattern/svHjSFHw">reactor pattern</a>. </p>