Write an OnRequestUpdate event handler to provide an alternate mechanism for applying updates to the application server. For example, the OnRequestUpdate event handler might call GetDelta to extract the delta packet from the request message and then preprocess the XML string before applying the updates with a call to ApplyXMLUpdates. 

OnRequestUpdate occurs immediately after the BeforeDispatch event or when the application calls the XML broker's RequestUpdate method. 

The Sender parameter is the object that received the update request (the XML broker or a Web action item). 

Request is the request message that contains the updates to be applied. The XML delta packet can be extracted from this request object using the GetDelta method. 

Response is the emerging response message that will be sent back to the Web browser that generated the update request. The event handler can set properties on this response object to partially or completely specify the message will be returned to the Web browser. 

Handled indicates whether the event handler applied the updates. If Handled is true on exit from the event handler, the XML broker does not apply the updates, does not receive an OnGetResponse or OnGetErrorResponse event, and does not call on the ReconcileProducer to generate a response message. (It does still receive an AfterDispatch event). If Handled is false on exit from the event handler, the XML broker proceeds to apply the updates contained in the request message and receives all the associated events.

BeforeDispatch 

ApplyXMLUpdates 

RequestUpdate 

GetDelta 

OnGetResponse 

OnGetErrorResponse 

ReconcileProducer 

AfterDispatch 

Using an XML Broker