IAsyncActionProvider (ITF)

INTERFACE IAsyncActionProvider EXTENDS __SYSTEM.IQueryInterface

Separated from the implementation of a function block for abstracting a background task (BackgroundTask), a additional interface for describing actions (IAsyncActionProvider) was introduced. New parameters for the current action will be passed by the itfParam input of the IAsyncActionProvider.AsyncAction method. The value is taken from a queue (See: itfParams of BackgroundTask). This way the AsyncAction is decoupled from foreground task processing. The processing of the action can take several cycles. At the end of processing, the output xComplete` is set to TRUE and the result of the action is made available to the foreground task via the IAsyncActionProvider.AsyncResult property.

Properties:

AsyncResult

Methods:

AsyncAction

Structure:

• AsyncAction (Method)
• AsyncResult (Property)