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<variable name="bureaus" element="sca-bpel:serviceReferenceList"> <sca-bpel:multiReference partnerLinkType="pos:CreditBureauPT" partnerRole="bureau" /> </variable>
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This causes the bureaus" variable to hold endpoint references for each service that the multireference is wired to within the composite le The child element of the variable declaration is used to specify the type of the reference, which may be either a singledirection interface or a bidirectional interface, speci ed using a partnerLinkType and a partnerRole; this is analogous to the way single-valued references are typed At runtime, the contents of the bureaus" variable will be a document that looks like Listing 1010
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<<sr:serviceReferenceList xmlns:sr="http://docsoasis-openorg/wsbpel/20/serviceref" xmlns:wsa="http://schemasxmlsoaporg/ws/2003/03/addressing"> <sr:serviceRef> <wsa:EndpointReference> <wsa:Address>http://creditBureau1com/svc</wsa:Address>
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SCA Extensions to BPEL </wsa:EndpointReference> </sr:serviceRef> <sr:serviceRef> <wsa:EndpointReference> <wsa:Address>http://creditBureau2com/svc</wsa:Address> </wsa:EndpointReference> </sr:serviceRef> </sr:serviceReferenceList>
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Next is the BPEL representation of a parallel call to each credit bureau We take advantage of BPEL s parallel for-each activity to accomplish this It looks like Listing 1011
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Listing 1011 Accessing All (0n) Reference Targets in Parallel
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<forEach counterName="idx"> <startCounterValue>1</startCounterValue> < nalCounterValue> count($bureaus/sref:service-ref) </ nalCounterValue> <scope> <partnerLinks> <partnerLink name="bureauLink" partnerLinkType="pos:CreditBureauPT" partnerRole="bureau" sca-bpel:multiRefFrom="bureaus" /> </partnerLinks> <sequence> <assign> <copy> <from>$bureaus/sref:service-ref[$idx]</from> <to partnerLink="bureauLink"/> </copy> </assign> <invoke partnerLink="bureauLink" operation="getCreditReport" inputVariable="applicantSSN" outputVariable="creditReport"> </invoke> do something with the credit report </sequence> </scope> </forEach>
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In this code sample, you can see that the forEach loop variable only maintains the variable for the index If there are three credit bureaus in our list (that is, there were three wires), the forEach will initiate three parallel branches of control ow Within each scope, a local partner link is de ned, and that partner link is assigned one
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of the targets (the bold part of the preceding code) This means that in this example, three scopes will be simultaneously started, each scope will have its own partner link, and each partner link will be assigned to one of the three reference targets When each invoke completes, it now has the credit report for the applicant from one of the three credit bureaus The next thing to do would be to add that credit report to a list of credit reports that will be given to the reviewers that come later in the process (This part of the code was not shown in the preceding sample) The entire forEach will complete when the scope of all three of the initiated scopes have been completed The rest of the process can then run
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BPEL is a language that was designed for orchestrating web services It is easy to use standard BPEL process de nitions as the implementation of components within SCA It is also possible to use SCA extensions to standard BPEL to take advantage of SCA-speci c features, such as properties and multireferences, or to customize things like the names of the service and references that are generated for a process de nition
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SCA is not intended to be a platform technology By platform technology, we mean a technology such as Java EE and NET designed to cover all application development needs, from the user interface (or interfaces) to long-term data storage Rather, SCA is concerned with what is typically referred to as the middle-tier : the code that comprises the bulk of an application s processing logic All but the most trivial applications require some form of persistence, most commonly to a relational database; many applications also require some form of user interface SCA does not offer its own set of solutions for the presentation and persistence tiers Instead, the goal of the SCA authors was to make it easy to integrate with existing and emerging technologies in these areas Seen in this light, although covering signi cant ground, SCA is less ambitious than Java EE and NET A bene t of this approach is that developers don t need to learn a completely new set of technologies when working with SCA However, a major downside is that with SCA, there is no clear consensus or one way to handle presentation and persistence needs Indeed, a number of approaches have been taken by vendors and open source SCA implementations In the next chapter, we take a look at how Java EE web applications can front-end SCA services In this chapter, we focus on persistence, and in particular, how