Proactor pattern

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Proactor is a software design pattern for event handling in which long running activities are running in an asynchronous part. A completion handler is called after the asynchronous part has terminated. The proactor pattern can be considered to be an asynchronous variant of the synchronous reactor pattern.^[1]

Interaction

UML Sequence diagram of Proactor

Operation specific actors:

The Proactive Initiator starts the asynchronous operation via the Asynchronous Operation Processor and defines the Completion Handler
Completion Handler is a call at the end of the operation from the Asynchronous Operation Processor
Asynchronous Operation

Standardized actors

The Asynchronous Operation Processor controls the whole asynchronous operation
The Completion Dispatcher handles the call, depending on the execution environment.

Implementations

Proactor and Boost.Asio (C++)
Adaptive Communication Environment (C++)
RJR (Ruby)

See also

Reactor pattern (a pattern that also asynchronously queues events, but demultiplexes and dispatches them synchronously)

References

^ Pattern-Oriented Software Architecture, Volume 2, Schmidt et al., Jon Wiley & Sons, Ltd, 2000

External links

Proactor - An Object Behavioral Pattern for Demultiplexing and Dispatching Handlers for Asynchronous Events, Irfan Pyarali, Tim Harrison, Douglas C. Schmidt, Thomas D. Jordan, 1997 (pdf 143 kB)

Software design patterns

Gang of Four
patterns

Creational	Abstract factory Builder Factory method Prototype Singleton
Structural	Adapter Bridge Composite Decorator Facade Flyweight Proxy
Behavioral	Chain of responsibility Command Interpreter Iterator Mediator Memento Observer State Strategy Template method Visitor

Concurrency
patterns

Architectural
patterns

Other
patterns

Books

People

Communities

See also

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