Using interfacewsdl with the JMS Binding in Java

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Listing 811
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Using interfacewsdl with the JMS Binding
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<composite name="LoanApplicationComposite" > <service name="LoanService" promote=" LoanComponent"> <interfacewsdl wsdlElement="http://wwwbigbankcom/audit# wsdlport(AuditService/AuditPort) "/> <bindingjms> <destination name="AuditQueue"/>
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Accessing Messaging Infrastructure: The JMS Binding </bindingjms> </service> </composite>
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The WSDL for the AuditService will contain de nitions for its operations and the messages they receive and return A message de nition in WSDL is speci ed using XML Schema When a message is enqueued, the SCA runtime will serialize parameters as part of the JMS message SCA mandates parameters be sent using JMS text messages The format for parameter serialization is, however, left unspeci ed The Fabric3 SCA runtime uses JAXB for complex types, and it is likely that other vendor implementations will support the data-binding technology In addition, Fabric3 also supports sending JMS object messages (when parameter types implement javalangSerializable), JMS stream messages, and JMS bytes messages for primitive types (for example, int or long) Request-Response Messaging with JMS Message-based communication is often one-way However, there are times when a response is needed In SCA, there are two ways to propagate responses, either as a return value to an operation or through a callback In this section, we discuss request-response operations using the JMS binding In the next section, we cover callbacks One of the loan application requirements is that new mortgage applications be appraised for their value on the secondary market After a loan is made, BigBank often sells the right to collect interest and principal payments to a third party The appraisal is handled by a legacy system accessible via BigBank s JMS provider Like the auditing function, BigBank de nes a service interface to the legacy appraisal system, which is listed in Listing 812
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Listing 812
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The Secondary Market Appraisal Legacy System
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public interface SecondaryAppraisalService { AppraisalResult appraise(LoanApplication application); }
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The SecondaryAppraisalService uses request-response style messaging: After the service has been invoked, the client blocks waiting for a response How does this interface map to JMS, given that messages are sent in a one-way, asynchronous fashion Request-response messaging is commonly implemented in JMS using separate request and reply queues (see Figure 83)
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Client sends a request Endpoint processes the request
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Request Queue Client receives the response Endpoint sends the response
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ReplyTo Queue
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Request-response messaging with JMS
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JMS has built-in support for request-response messaging with the replyTo message header Using the JMS API directly, a client sets the replyTo header to the queue on which it receives responses The message endpoint in turn uses the replyTo header for the queue to return a response An example of setting the replyTo queue is given in Listing 813
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Listing 813
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Setting the JMS replyTo Header
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// String loanApplication = // the loan information in XML form Connection connection = // obtain a JMS connection; Destination destination = // obtain the audit destination Session session = connectioncreateSession(true, SessionAUTO_ACKNOWLEDGE); MessageProducer producer = sessioncreateProducer(destination); Message message = sessioncreateMessage(); messagesetJMSReplyTo(replyDestination); messagesetText(loanApplication); producersend(message); // cleanup resources
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Accessing Messaging Infrastructure: The JMS Binding
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Similarly, the message endpoint accesses the replyTo queue by calling MessagegetJMSReplyTo() on the received message One missing piece we have not yet discussed is how a client associates a response with the original request Because JMS is asynchronous, a client may send multiple requests before it receives any responses Consequently, it needs a way to correlate response messages with its original request JMS provides built-in support for message correlation via the correlationId message header The correlation ID is most commonly set to the message ID of the original request by the message endpoint Listing 814 shows how an endpoint sets the correlation ID
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Listing 814
Setting the JMS Correlation ID Header
// Message requestMessage = // the request message // process the message and then send the reply Connection connection = // obtain a JMS connection; Destination destination = messagegetJMSReplyTo() Session session = connectioncreateSession(true, SessionAUTO_ACKNOWLEDGE); MessageProducer producer = sessioncreateProducer(destination); Message message = sessioncreateMessage(); messagesetJMSCorrelationID(requestMessagegetJMSNMessageID()); producersend(message); // cleanup resources
When the client receives the response, it can use the correlation ID to match the message to the original request Setting up request and response queues and managing correlation can be tedious An SCA runtime will handle this so that requestresponse invocations can be made without having to perform these tasks in application code Listing 815 shows how to invoke the SecondaryAppraisalService and receive a response over JMS it s no different than invoking any other reference