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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Proactor pattern</span></span>
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<p><b>Proactor</b> is a <a href="Design_pattern_(computer_science)" class="mw-redirect" title="Design pattern (computer science)">software design pattern</a> for <a href="Event_handling" class="mw-redirect" title="Event handling">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 <a href="https://en.wiktionary.org/wiki/asynchronous" class="extiw external" title="wikt:asynchronous">asynchronous</a> variant of the <a href="Synchronization_(computer_science)" title="Synchronization (computer science)">synchronous</a> <a href="Reactor_pattern" title="Reactor pattern">reactor pattern</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="Interaction">Interaction</h2></div>
<p>Operation specific actors:
</p>
<ul><li>The <i>Proactive Initiator</i> starts the asynchronous operation via the Asynchronous Operation Processor and defines the Completion Handler</li>
<li><i>Completion Handler</i> is a call at the end of the operation from the Asynchronous Operation Processor</li>
<li><i>Asynchronous Operation</i></li></ul>
<p>Standardized actors
</p>
<ul><li>The <i>Asynchronous Operation Processor</i> controls the whole asynchronous operation</li>
<li>The <i>Completion Dispatcher</i> handles the call, depending on the execution environment.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Implementations">Implementations</h2></div>
<ul><li><a rel="nofollow" class="external text" href="http://www.boost.org/doc/libs/release/doc/html/boost_asio/overview/core/async.html">Proactor and Boost.Asio</a> (<a href="C%2B%2B" title="C++">C++</a>)</li>
<li><a href="Adaptive_Communication_Environment" title="Adaptive Communication Environment">Adaptive Communication Environment</a> (<a href="C%2B%2B" title="C++">C++</a>)</li>
<li><a rel="nofollow" class="external text" href="https://github.com/movitto/rjr">RJR</a> (Ruby)</li></ul>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Reactor_pattern" title="Reactor pattern">Reactor pattern</a> (a pattern that also asynchronously queues events, but demultiplexes and dispatches them synchronously)</li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Pattern-Oriented Software Architecture, Volume 2, Schmidt et al., Jon Wiley & Sons, Ltd, 2000</span>
</li>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://www.dre.vanderbilt.edu/~schmidt/PDF/Proactor.pdf">Proactor - An Object Behavioral Pattern for Demultiplexing and Dispatching Handlers for Asynchronous Events</a>, Irfan Pyarali, Tim Harrison, <a href="Douglas_C._Schmidt" title="Douglas C. Schmidt">Douglas C. Schmidt</a>, Thomas D. Jordan, 1997 (pdf 143 kB)</li></ul>
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</style><div id="Software_design_patterns225" style="font-size:114%;margin:0 4em"><a href="Software_design_pattern" title="Software design pattern">Software design patterns</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Design_Patterns" title="Design Patterns">Gang of Four<br>patterns</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Creational_pattern" title="Creational pattern">Creational</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Abstract_factory_pattern" title="Abstract factory pattern">Abstract factory</a></li>
<li><a href="Builder_pattern" title="Builder pattern">Builder</a></li>
<li><a href="Factory_method_pattern" title="Factory method pattern">Factory method</a></li>
<li><a href="Prototype_pattern" title="Prototype pattern">Prototype</a></li>
<li><a href="Singleton_pattern" title="Singleton pattern">Singleton</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Structural_pattern" title="Structural pattern">Structural</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Adapter_pattern" title="Adapter pattern">Adapter</a></li>
<li><a href="Bridge_pattern" title="Bridge pattern">Bridge</a></li>
<li><a href="Composite_pattern" title="Composite pattern">Composite</a></li>
<li><a href="Decorator_pattern" title="Decorator pattern">Decorator</a></li>
<li><a href="Facade_pattern" title="Facade pattern">Facade</a></li>
<li><a href="Flyweight_pattern" title="Flyweight pattern">Flyweight</a></li>
<li><a href="Proxy_pattern" title="Proxy pattern">Proxy</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Behavioral_pattern" title="Behavioral pattern">Behavioral</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Chain-of-responsibility_pattern" title="Chain-of-responsibility pattern">Chain of responsibility</a></li>
<li><a href="Command_pattern" title="Command pattern">Command</a></li>
<li><a href="Interpreter_pattern" title="Interpreter pattern">Interpreter</a></li>
<li><a href="Iterator_pattern" title="Iterator pattern">Iterator</a></li>
<li><a href="Mediator_pattern" title="Mediator pattern">Mediator</a></li>
<li><a href="Memento_pattern" title="Memento pattern">Memento</a></li>
<li><a href="Observer_pattern" title="Observer pattern">Observer</a></li>
<li><a href="State_pattern" title="State pattern">State</a></li>
<li><a href="Strategy_pattern" title="Strategy pattern">Strategy</a></li>
<li><a href="Template_method_pattern" title="Template method pattern">Template method</a></li>
<li><a href="Visitor_pattern" title="Visitor pattern">Visitor</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Concurrency_pattern" title="Concurrency pattern">Concurrency<br>patterns</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Active_object" title="Active object">Active object</a></li>
<li><a href="Balking_pattern" title="Balking pattern">Balking</a></li>
<li><a href="Binding_properties_pattern" title="Binding properties pattern">Binding properties</a></li>
<li><a href="Double-checked_locking" title="Double-checked locking">Double-checked locking</a></li>
<li><a href="Asynchronous_method_invocation" title="Asynchronous method invocation">Event-based asynchronous</a></li>
<li><a href="Guarded_suspension" title="Guarded suspension">Guarded suspension</a></li>
<li><a href="Join-pattern" title="Join-pattern">Join</a></li>
<li><a href="Lock_(computer_science)" title="Lock (computer science)">Lock</a></li>
<li><a href="Monitor_(synchronization)" title="Monitor (synchronization)">Monitor</a></li>
<li><a href="Reactor_pattern" title="Reactor pattern">Reactor</a></li>
<li><a href="Readers%E2%80%93writer_lock" title="Readers–writer lock">Read–write lock</a></li>
<li><a href="Scheduler_pattern" class="mw-redirect" title="Scheduler pattern">Scheduler</a></li>
<li><a href="Scheduled-task_pattern" title="Scheduled-task pattern">Scheduled-task pattern</a></li>
<li><a href="Semaphore_(programming)" title="Semaphore (programming)">Semaphore</a></li>
<li><a href="Thread_pool" title="Thread pool">Thread pool</a></li>
<li><a href="Thread-local_storage" title="Thread-local storage">Thread-local storage</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Architectural_pattern" title="Architectural pattern">Architectural<br>patterns</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Front_controller" title="Front controller">Front controller</a></li>
<li><a href="Interceptor_pattern" title="Interceptor pattern">Interceptor</a></li>
<li><a href="Model%E2%80%93view%E2%80%93controller" title="Model–view–controller">MVC</a>
<ul><li><a href="Model%E2%80%93view%E2%80%93presenter" title="Model–view–presenter">MVP</a></li>
<li><a href="Model%E2%80%93view%E2%80%93viewmodel" title="Model–view–viewmodel">MVVM</a></li></ul></li>
<li><a href="Action%E2%80%93domain%E2%80%93responder" title="Action–domain–responder">ADR</a></li>
<li><a href="Entity_component_system" title="Entity component system">ECS</a></li>
<li><a href="Multitier_architecture" title="Multitier architecture"><i>n</i>-tier</a></li>
<li><a href="Specification_pattern" title="Specification pattern">Specification</a></li>
<li><a href="Publish%E2%80%93subscribe_pattern" title="Publish–subscribe pattern">Publish–subscribe</a></li>
<li><a href="Naked_objects" title="Naked objects">Naked objects</a></li>
<li><a href="Service_locator_pattern" title="Service locator pattern">Service locator</a></li>
<li><a href="Active_record_pattern" title="Active record pattern">Active record</a></li>
<li><a href="Identity_map_pattern" title="Identity map pattern">Identity map</a></li>
<li><a href="Data_access_object" title="Data access object">Data access object</a></li>
<li><a href="Data_transfer_object" title="Data transfer object">Data transfer object</a></li>
<li><a href="Inversion_of_control" title="Inversion of control">Inversion of control</a></li>
<li><a href="JSP_model_2_architecture" title="JSP model 2 architecture">Model 2</a></li>
<li><a href="Broker_pattern" title="Broker pattern">Broker</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other<br>patterns</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Blackboard_design_pattern" class="mw-redirect" title="Blackboard design pattern">Blackboard</a></li>
<li><a href="Business_delegate_pattern" title="Business delegate pattern">Business delegate</a></li>
<li><a href="Composite_entity_pattern" title="Composite entity pattern">Composite entity</a></li>
<li><a href="Dependency_injection" title="Dependency injection">Dependency injection</a></li>
<li><a href="Guard_(computer_science)" title="Guard (computer science)">Guard clause</a></li>
<li><a href="Intercepting_filter_pattern" title="Intercepting filter pattern">Intercepting filter</a></li>
<li><a href="Lazy_loading" title="Lazy loading">Lazy loading</a></li>
<li><a href="Mock_object" title="Mock object">Mock object</a></li>
<li><a href="Null_object_pattern" title="Null object pattern">Null object</a></li>
<li><a href="Object_pool_pattern" title="Object pool pattern">Object pool</a></li>
<li><a href="Servant_(design_pattern)" title="Servant (design pattern)">Servant</a></li>
<li><a href="Twin_pattern" title="Twin pattern">Twin</a></li>
<li><a href="Type_Tunnel_pattern" class="mw-redirect" title="Type Tunnel pattern">Type tunnel</a></li>
<li><a href="Method_chaining" title="Method chaining">Method chaining</a></li>
<li><a href="Delegation_pattern" title="Delegation pattern">Delegation</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Books</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="Design_Patterns" title="Design Patterns">Design Patterns</a></i></li>
<li><i><a href="Enterprise_Integration_Patterns" title="Enterprise Integration Patterns">Enterprise Integration Patterns</a></i></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Christopher_Alexander" title="Christopher Alexander">Christopher Alexander</a></li>
<li><a href="Erich_Gamma" title="Erich Gamma">Erich Gamma</a></li>
<li><a href="Ralph_Johnson_(computer_scientist)" title="Ralph Johnson (computer scientist)">Ralph Johnson</a></li>
<li><a href="John_Vlissides" title="John Vlissides">John Vlissides</a></li>
<li><a href="Grady_Booch" title="Grady Booch">Grady Booch</a></li>
<li><a href="Kent_Beck" title="Kent Beck">Kent Beck</a></li>
<li><a href="Ward_Cunningham" title="Ward Cunningham">Ward Cunningham</a></li>
<li><a href="Martin_Fowler_(software_engineer)" title="Martin Fowler (software engineer)">Martin Fowler</a></li>
<li><a href="Robert_C._Martin" title="Robert C. Martin">Robert Martin</a></li>
<li><a href="Jim_Coplien" title="Jim Coplien">Jim Coplien</a></li>
<li><a href="Douglas_C._Schmidt" title="Douglas C. Schmidt">Douglas Schmidt</a></li>
<li><a href="Linda_Rising" title="Linda Rising">Linda Rising</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Communities</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="The_Hillside_Group" title="The Hillside Group">The Hillside Group</a></li>
<li><a href="Portland_Pattern_Repository" title="Portland Pattern Repository">Portland Pattern Repository</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">See also</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Anti-pattern" title="Anti-pattern">Anti-pattern</a></li>
<li><a href="Architectural_pattern" title="Architectural pattern">Architectural pattern</a></li></ul>
</div></td></tr></tbody></table></div>
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