[jboss-dev-forums] [JBoss ESB Development] New message: "Allow Service execution from HttpGatewayServlet with ?wsdl requests when there is no ContractProvider available"

[David Ward]

JBoss development,

A new message was posted in the thread "Allow Service execution from HttpGatewayServlet with ?wsdl requests when there is no ContractProvider available":

http://community.jboss.org/message/528013#528013

Author  : David Ward
Profile : http://community.jboss.org/people/dward

Message:
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Please first read this JBoss ESB User Forum thread first: http://community.jboss.org/thread/148046

Right now, the SOAPProxyWsdlContractPublisher is the only Publisher that implements ContractProvider.  When an action pipeline contains the SOAPProxy, then, the HttpGatewayServlet knows to execute it to get the WSDL contract from a http://.../http/category/service?wsdl URL.  This is correct behavior.

Now, say that a developer has his/her own actions +not+ including the SOAPProxy, but still want to expose his/her own WSDL for it, as in the aforementioned user forum thread...  If a developer wants to, there is nothing stopping him/her from creating his/her own custom action that has a Publish annotation defining a custom Publisher implementation that extends, for example,  DefaultContractReferencePublisher and implements the ContractProvider interface.  Then not only can the developer serve up this/her own WSDL, but that WSDL would also dynamically be available via the contract JSP application ( http://.../contract/ ).  But that's a bit of work...

However, if the developer doesn't care about exposing the WSDL in the contract JSP application, but still wants the HttpGatewayServlet to expose their own WSDL, but DOESN'T want to go through the work mentioned above, it would be nice to provide that functionality.  To do that, a very simple change to HttpGatewayServlet would have to be made:

Right now, the HttpGatewayServlet looks for query strings of ?wsdl (or ?WSDL).  If found, it immediately short-circuits and exposes the WSDL contract it found using the ContractProvider.  +*If there was no ContractProvider, an empty <definitions/> WSDL is returned.*+  The easy change would be that once the servlet knows it's a WSDL request, if there is a ContractProvider, spit out the WSDL it provides, but if there is NO ContractProvider don't short-circuit, instead go ahead and execute ServiceInvoker.  Then, in a custom action at the beginning of the pipeline, the developer could use HttpRequest requestInfo = HttpRequest.getRequest(message); to inspect the message, see that it was a WSDL request, and spit out the custom WSDL, otherwise, do something else.

Thoughts?
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