Repeated Event Detection Parts

Introduction    Implementing    Parts

New and changed objects in the Repeated Event Detection pattern.

Data

The SessionControl pattern contains only one data entity:

• The DetectedEvents entity stores the events that has been activated one or more times.

Abstract

The Abstract entity contains the Websydian EventHandler and PageGenerator functions enhanced with functionality to implement Repeated Event Detection:

• The PageGenerator pattern implements Event Detection functionality for Page Generator functions. This function has been enhanced so it adds the PageID field to every page that contains protected events. The PageID then appears as hidden input fields for the protected events.
  The PageID is taken from the RequestCount field on the current session as this field is incremented automatically for each request and thereby can serve as an unique page ID.
• The EventHandler pattern implements Event Detection functionality for the Event Handler
  This function uses the SessionID, PageID, and EventID to find out whether the event has been activated previously. If so further access is denied and the user is presented with an error message specifying the cause of the failure.

Services

• Services contains the error page that will be shown when a repeated event is detected.