The Biztalk Integration Architect: Subscribing to custom message context properties

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February 09, 2005

Subscribing to custom message context properties

Here's an interesting little something I came across while building my custom adapter:

There's a boolean "promoted" value associated with all data and context message properties, which I am now aware of thanks to Charles. I had assumed erroneously that this meant that the property had or had not been promoted from data. However, this is not the case. Turns out, you can't create subscriptions on just any promoted propety. The properties also need this boolean to be true before a subscription can be created on them. You can view this property from the message details window of HAT.

So supposing that inside your adapter code you've gotten an IBaseMessageContext object called msgContext from your IBaseMessageFactory which you've in turn obtained from the IBTTransportProxy provided by BizTalk...

//Create the custom (promoted=false!) context property
msgContext.Write("NoSubCustomProp", "http://myCustomPropNS", "can't create subscriptions based on this context property");

//Got to promote the property before a subscription can be created on it
msgContext.Promote("OKSubCustomProp", "http://myCustomPropNS", "OK to create subscriptions based on this context property");

However, this is only the case if you're dealing with message context properties, because BizTalk automatically flips this flag when a property is promoted from the schema of messages processed by BizTalk.

So this is fine when promoting the properties in a custom adapter or pipeline component, but what if you need to do so in an orchestration? For example, suppose MessageA activates your orchestration, where you map from MessageA to MessageB, and then you want to pub MessageB straight to the message box? In this case the message context properties will by default have the "promoted" flag flipped to false, and unless there's another way I'm not aware of the only way to flip it to true is by using a correlation set. So suppose that in the orchestration we've got a transform shape, and after that we've got a message assignment shape. In the message assignment shape you can get the property into the message with something along the lines of:
MessageB(MyProp) = "RouteTHIS"; //which will have promoted = false

In the specific case I was looking at, MyProp was a property on the inbound message as well, so I initialized a correlation set when receiving that message including MyProp, and set it as my following correlation set on my send shape. Voila, promoted gets flipped to true on MessageB, and I'm good to sub.

So what happens if the context property you want to route on isn't on the inbound message? I'm not really sure offhand, actually. I took a few minutes to try it out, and tried initializing the correlation set when sending MessageB. This gives me an error to the extent of "Cannot promote MyProp from the system namespace" but of course MyProp isn't in the system namespace! Also, maybe the properties wouldn't get flipped anyhow because I was initializing the correlation set. Any thoughts?

Posted by alexander at February 9, 2005 10:16 AM

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