MQSeries.net :: View topic - Troubles Implementing the Service Gateway Pattern in WMB 6.1

ccrandall · Posted: Fri Feb 26, 2010 2:47 pm Post subject:

I'm trying to modify our Message Broker framework so we can use it to front legacy services with a SOAP-based web service. In the beginning, we created 1 Message Set/Message Definition for each WSDL and a corresponding SOAP Input Node. We quickly realized that in a short amount of time, this wouldn't scale very well.

Recently, we've added DataPower to our set up and we are using it primarily for providing security. However, it's also providing us with validation of the SOAP requests. Since our MB framework no longer needs to validate the request, and each request is processed the same way, it appeared that there'd be an easier way to handle N number of web services.

We worked for a few days with a consultant who recommended we try using the Service Gateway pattern; basically use a generic WSDL whose only type is a message of anyType. Below is the WSDL I've created based off our discussions:

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions name="ServiceGateway" xmlns:wsi="http://ws-i.org/profiles/basic/1.1/xsd" xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://com.abc..broker.service.ServiceGatewayOperation" targetNamespace="http://com.abc.broker.service.ServiceGatewayOperation" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
<wsdl:types>
<xsd:schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://com.abc.broker.service.ServiceGatewayOperation">
<xsd:element name="message" type="xsd:anyType" />
</xsd:schema>
</wsdl:types>
<wsdl:message name="gatewayMessage">
<wsdl:part name="message" element="tns:message" />
</wsdl:message>
<wsdl:portType name="ServiceGateway">
<wsdl:operation name="ServiceGatewayOperation">
<wsdl:input name="gatewayRequest" message="tns:gatewayMessage" />
<wsdl:output name="gatewayResponse" message="tns:gatewayMessage" />
<wsdl:fault name="fault" message="tns:gatewayMessage" />
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="ServiceGatewayBinding" type="tns:ServiceGateway">
<wsdlsoap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http" />
<wsdl:operation name="ServiceGatewayOperation">
<wsdlsoap:operation soapAction="" />
<wsdl:input name="gatewayRequest">
<wsdlsoap:body use="literal" />
</wsdl:input>
<wsdl:output name="gatewayResponse">
<wsdlsoap:body use="literal" />
</wsdl:output>
<wsdl:fault name="fault">
<wsdlsoap:fault name="fault" use="literal" />
</wsdl:fault>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="ServiceGatewayService">
<wsdl:port name="ServiceGateway" binding="tns:ServiceGatewayBinding">
<wsdlsoap:address location="http://localhost:7800/service/ServiceGateway" />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>

Using this WSDL, I created a Message Set/Message Definition and a corresponding SOAP Input Node and wired that node to our request flow.

I then created another WSDL that represents one of the services we want to support and then used SOAPUI to send SOAP requests to our MB frameowrk. Below is a sample request:

Host: localhost:7800
Content-Length: 525
SOAPAction: "ServiceGatewayOperation"
User-Agent: Jakarta Commons-HttpClient/3.0.1
Content-Type: text/xml;charset=UTF-8

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:m="http://com.abc.broker.service.ServiceGatewayOperation">
<soapenv:Header/>
<soapenv:Body>
<m:ServiceGatewayOperation>
<request>
<KeyType>JobFunctionCde</KeyType>
<KeyValue>5</KeyValue>
<JobFuncStatusInd>A</JobFuncStatusInd>
</request>
</m:ServiceGatewayOperation>
</soapenv:Body>
</soapenv:Envelope>

(I removed some proprietary info, so the content length is incorrect.)

When sending this message, I get the following error in the MB framework:

ParserException BIP3602E: The Web service payload ''{http://com.abc.broker.service.ServiceGatewayOperation}ServiceGatewayOp
eration'' does not match an operation described by WSDL binding ''ServiceGatewayBinding'' in file ''/var/mqsi/components/APS61BA3/27400fc2-1b01-0000-0080-f7b
fd499757a/config/XSD/ServiceGatewayMessageSet/servicegatewayoperation/service/broker/abc/com/ServiceGateway.wsdl''.

I also tried editing the Service Gateway WSDL so that the soapAction="ServiceGatewayOperation", but I get the same error.

I'm relatively new to web services and I've spent a lot of time the last several days trying to read up SOAP/WSDL definitions, etc. to make sure I'm crafting my WSDL correctly. I'm still not seeing where my error is, though.

Furthermore, we really need our MB framework to accept any SOAPAction/Operation w/o it being hardcoded as "ServiceGatewayOperation". This is a requirement to support our Java-based web service clients... they need to use unique method names to call the operation and apparently cannot overload using the same operation name (not clear on the specifics here, it's another set of folks working on that stuff).

Is what I'm trying to do possible? If so, if someone could point me in the right direction I would be very appreciative.

Thank you!
Curt