Using BPEL for the Loan Service in Java

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Using BPEL for the Loan Service
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To get a sense for using BPEL to implement a component, we will replace the Java implementation of the loan service from the application introduced in 4 with a BPEL implementation of that service BPEL does not de ne a graphical representation for processes, although the expectation has always been that a graphical representation would be the most common way for developers to work with these processes However, the OASIS technical committee that standardized BPEL was not chartered to standardize such a representation One common notation for business processes is the
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Business Process Modeling Notation (BPMN) Its concepts don t align perfectly with BPEL, because it has a number of constructs with no equivalent in BPEL, and BPEL has constructs without a representation in BPMN Nonetheless, it is close enough to represent the basic control ow of the process For the sake of this example, imagine that the process for handling new loan applications is a little bit more complicated than it was in 4; let s create a loan-approval process based on the loanapplication process used as an example at the end of the BPEL speci cation In this process, if the loan amount is less than some designated amount (say $10,000), a call is made to a risk assessment service, which tries to determine whether the risk is low enough to immediately approve it, or high enough to immediately deny it If, however, the amount is larger than $10,000 or if the automatic risk assessment service can t make a clean determination, the full loan review is initiated The process might look like that shown in Figure 102 Unfortunately, BPMN has no representation of the partner links behind the communication activities Listing 101 is some of the partner link declaration section of that process
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Listing 101 Partner Links for the Loan Application Process
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<partnerLinks> <partnerLink name="customer" partnerLinkType="lns:loanPartnerLT" myRole="loanService" /> <partnerLink name="approver" partnerLinkType="lns:loanApprovalLT" partnerRole="approver" /> <partnerLink name="assessor" partnerLinkType="lns:riskAssessmentLT" partnerRole="assessor" /> </partnerLinks>
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All the partner links in this process have only a single role The partner link with myRole="loanService" is the only service offered by the process The other two (named approver" and assessor") are references The algorithm for the mapping of partner links to services and references is described in the next section
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Using BPEL for the Loan Service
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Because this implementation makes use of an approver and an assessor, our assembly needs a couple of additional components that existed in the composite described in 4 The new composite would look like what is shown in Figure 103
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Loan Approval Process
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Partner Links Are Services and References
BPEL identi es the external services that it communicates with through partner links, and like SCA services and references, they can be bidirectional
BPEL identi es the external services that it communicates with through partner links, and like SCA services and references, they can be bidirectional The client may need to provide services that can be used by the process for callbacks A partner link s type is speci ed by a partner link type, which consists of either one or two port types (two if it is bidirectional) Symmetry of Partner Link Types There is one difference between SCA s concept of bidirectional interfaces and BPEL s partner link types, which is that partner link types are symmetric An SCA bidirectional interface is made of an interface and a callback interface There is an implication that the service provider is providing the interface and the client is providing the callback interface However, BPEL makes no such distinction In fact, BPEL does not refer to the two roles as service provider and client The roles can have any name, and there is nothing else to distinguish one role as more important than the other