Proactor pattern

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.

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.

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)