The Composite Implementation Type Listing 51 The Credit Service Composite in Java

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The Composite Implementation Type Listing 51 The Credit Service Composite
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<composite xmlns="http://wwwosoaorg/xmlns/sca/10" targetNamespace="http://wwwbigbankcom/xmlns/ loanApplication/10" name=" CreditServiceComposite"> <component name ="CreditComponent"> <implementationjava class="combigbankCreditComponent"/> <reference name="validationService" target="ValidationComponent"/> <reference name="scoringService" target="ScoringComponent"/> <reference name="auditService" target="AuditingComponent"/> <component> <component name ="ValidationComponent"> <implementationjava class="combigbankValidationComponent"/> <component> <component name ="ScoringComponent"> <implementationjava class="combigbankScoringComponent"/> <component> <component name ="AuditingComponent"> <implementationjava class="combigbankAuditingComponent"/> <component> </composite>
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We could have chosen to include these four components in the original LoanApplication composite However, as the application grows, that strategy will likely result in a brittle and dif cult-tomaintain system In the future, all or part of the credit-scoring components may need to be changed In addition, con guring all components in one composite is likely to result in a very unstructured application that is dif cult to decipher (not to mention developers stepping on one another as they modify parts of the single composite) Instead, good design suggests that we encapsulate the creditscoring function in a composite, which is then used as a component by the LoanApplication composite Figure 54 depicts this visually
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LoanApplicationComposite
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Encapsulating the credit-scoring process
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The SCDL in Listing 52 con gures LoanComponent and CreditComponent
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Listing 52
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The Credit Score Composite SCDL
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<composite name="LoanApplication"> <component name ="LoanComponent"> <implementationjava class="combigbankLoanComponent"/> <component> <component name ="CreditComponent"> <implementationcomposite name="loan:CreditServiceComposite"/> <component> </composite>
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The key part of the preceding SCDL is the use of the <implementationcomposite> element This instructs the SCA runtime to use a composite as the component implementation, just as if we had speci ed <implementationjava> or <implementationbpel> However, instead of referencing the class name, we refer to the fully quali ed name of the composite using the name attribute The fully quali ed name, or QName, consists of the target namespace and name of the composite This is equivalent to specifying the package and class name for Java implementation types
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It is worth highlighting one of the subtleties associated with using composite quali ed names for <implementationcomposite> Namely, the QName does not need to correspond to a particular le location or composite lename The QName is only a logical name The CreditComposite could be de ned in a le named CreditCompositecomposite located in the META-INF directory of a jar contribution (Recalling from 2, Assembling and Deploying a Composite, composites are packaged into contribution archives for deployment) Or the composite could be located in some other directory or de ned in a le named creditcomposite Regardless of the lename or location, the SCA runtime is responsible for mapping the QName speci ed in <implementationcomposite> to the actual composite SCDL This makes assembly less susceptible to breaking during refactoring The lename or location could change, and the assembly would continue to work All that is required is that the QName must uniquely identify one composite within the contribution In addition, as we mentioned in 2 and will discuss in more detail in 9, The Domain, composites may be reused from other contributions By referring to composites using their QName, the client or importing contribution need not be aware of the internal structure of the contribution providing or exporting the composite
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The next step in encapsulating the credit-scoring process is to expose the CreditService from the CreditComposite Exposing or as SCA terms it, promoting a service in a composite serves two purposes It allows other references from outside the composite to be wired to it It also provides a mechanism for the service to be con gured by the composite using it as an implementation We discuss each of these in turn Services are promoted using the <service> element in the composite, as demonstrated in the SCDL fragment in Listing 53
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Exposing or as SCA terms it, promoting a service in a composite serves two purposes It allows other references from outside the composite to be wired to it It also provides a mechanism for the service to be con gured by the composite using it as an implementation
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