BPEL之贷款审批案例(2)
BPEL之贷款审批案例(2)
我们把该例的业务流程定义拷在下面，进行说明：
<process name="loanApprovalProcess"
targetNamespace="http://acme.com/loanprocessing"
xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:lns="http://loans.org/wsdl/loan-approval"
suppressJoinFailure="yes">
<partnerLinks>
<partnerLink name="customer"
partnerLinkType="lns:loanPartnerLinkType"
myRole="loanService"/>
<partnerLink name="approver"
partnerLinkType="lns:loanApprovalLinkType"
partnerRole="approver"/>
<partnerLink name="assessor"
partnerLinkType="lns:riskAssessmentLinkType"
partnerRole="assessor"/>
</partnerLinks>
<variables>
<variable name="request"
messageType="lns:creditInformationMessage"/>
<variable name="risk"
messageType="lns:riskAssessmentMessage"/>
<variable name="approval"
messageType="lns:approvalMessage"/>
<variable name="error"
messageType="lns:errorMessage"/>
</variables>
<faultHandlers>
<catch faultName="lns:loanProcessFault"
faultVariable="error">
<reply partnerLink="customer"
portType="lns:loanServicePT"
operation="request"
variable="error"
faultName="unableToHandleRequest"/>
</catch>
</faultHandlers>
<flow>
H:<flow>指明一组步骤应该并行地执行;在并行地执行的一组活动中，您可以通过使用链接（link）来指明执行顺序方面的约束。
<links>
<link name="receive-to-assess"/>
<link name="receive-to-approval"/>
<link name="approval-to-reply"/>
<link name="assess-to-setMessage"/>
<link name="setMessage-to-reply"/>
<link name="assess-to-approval"/>
</links>
H:流程的每一步称为一个活动。存在以下一些基本活动：
H:receive等待一条消息来响应由某人从外部进行调用的服务接口的操作
<receive partnerLink="customer"
portType="lns:loanServicePT"
operation="request"
variable="request" createInstance="yes">
H:转移及其条件
<source linkName="receive-to-assess"
transitionCondition=
"bpws:getVariableData('request','amount')< 10000"/>
<source linkName="receive-to-approval"
transitionCondition=
"bpws:getVariableData('request','amount')>=10000"/>
</receive>
H:invoke调用某个 Web 服务上的操作
<invoke partnerLink="assessor"
portType="lns:riskAssessmentPT"
operation="check"
inputVariable="request"
outputVariable="risk">
<target linkName="receive-to-assess"/>
<source linkName="assess-to-setMessage"
transitionCondition=
"bpws:getVariableData('risk','level')='low'"/>
<source linkName="assess-to-approval"
transitionCondition=
"bpws:getVariableData('risk','level')!='low'"/>
</invoke>
H:assign把数据从一个地方复制到另一个地方
<assign>
<target linkName="assess-to-setMessage"/>
<source linkName="setMessage-to-reply"/>
<copy>
<from expression="'yes'"/>
<to variable="approval" part="accept"/>
</copy>
</assign>
H:invoke调用某个 Web 服务上的操作
<invoke partnerLink="approver"
portType="lns:loanApprovalPT"
operation="approve"
inputVariable="request"
outputVariable="approval">
<target linkName="receive-to-approval"/>
<target linkName="assess-to-approval"/>
<source linkName="approval-to-reply" />
</invoke>
H:reply生成输入／输出操作的响应
<reply partnerLink="customer"
portType="lns:loanServicePT"
operation="request"
variable="approval">
<target linkName="setMessage-to-reply"/>
<target linkName="approval-to-reply"/>
</reply>
</flow>
</process>