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Sample business process
makes two asynchronous calls to obtain ticket information, including the price of the tickets from the two airlines. These two asynchronous calls are made at the same time. The replies from the two airlines are obtained by using callback operations. For these callback operations, the business process provides a portType to receive the ticket information. As a last step, the business process determines the lowest ticket offer and sends that offer to the customer.
Integration Through Service Composition (BPEL)
2: request 1: request Customer 6: reply portType Human Resource Web Service
3: reply
4.1: invoke Business Process United Airlines Web Service
4.2: callback portType
5.2: callback US Air Web Service
5.1: invoke
Business process Customer
Web Service portType
Interaction of the business process with the customer and other Web Services
Listing 16-15
Listing 16.15: Code of the example business process 1 <process name="BusinessTravel" 2 targetNamespace=http://myCompany.com/bpel/businesstravel/ 3 xmlns=http://schemas.xmlsoap.org/ws/2003/03/business-process/ 4 xmlns:bpws=http://schemas.xmlsoap.org/ws/2003/03/business-process/ 5 xmlns:hr=http://myCompany,com/service/hr/ 6 xmlns:line=http://myCompany.com/service/airline/ 7 xmlns:go=http://myCompany/bpel/go/ > 8 9 <partnerLinks> 10 <partnerLink name="customer" 11 partnerLinkType="go:goLT" 12 myRole="travelService" 13 partnerRole="travelServiceCustomer" /> 14 <partnerLink name="workerGoStatus" 15 partnerLinkType="hr:workerLT"
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
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partnerRole="workerGoStatusService" /> <partnerLink name="UnitedAirlines" partnerLinkType="line:flightLT" partnerRole="airlineService /> <partnerLink name="USAir" partnerLinkType="line:flightLT" partnerRole="airlineService" /> </partnerLinks> <variables> <variable name="CustomerRequest" messageType="go:CustomerRequestType" /> <variable name="WorkerGoStatusRequest" messageType="hr:WorkerGoStatusRequestType" /> <variable name="WorkerGoStatusResponse" messageType="hr:WorkerGoStatusResponseType" /> <variable name="FlightDetails" messageType="line:FlightTicketRequestType" /> <variable name="USAirFlightResponse" messageType="line:TravelTicketResponseType" /> <variable name="UnitedAirlinesFlightResponse" messageType="line:TravelTicketResponseType" /> <variable name="TravelResponse" messageType="line:TravelTicketResponseType" /> </variables> <sequence> <! Initial request from the customer <receive partnerLink="Customer" portType="go:GoApprovalPT" operation=" GoApproval" variable="CustomerRequest" createInstance="yes" />
<!-- Prepare input for worker status check <assign> <copy> <from variable="CustomerRequest" part="worker /> <to variable="WorkerGoStatusRequest" part="employee" /> </copy> </assign> <! invoke the worker status check Web Service <invoke partnerLink="WorkerGoSatus" portType="hr:WorkerGoSatusPT" operation="WorkerGoStatus" inputVariable="WorkerGoStatusRequest" outputVariable="WorkerGoStatusResponse" /> <! Make parallel invocations to United Airlines and US Air Web Services <flow> <sequence> <!-- make asynchronous invocation for United Airlines Web Service and wait for the call back -->
Integration Through Service Composition (BPEL)
69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 <invoke partnerLink="UnitedAirlines" portType="line:FlightAvailabilityPT" operation="FlightAvailability" inputVariable="FlightDetails" /> <receive partnerLInk="UnitedAirlines" portType="line:FlightCallbackPT" operation="FlightTicketCallback" variable="UnitedAirlinesFlightResponse" /> </sequence>
<sequence> <! Make similar asynchronous call to US Air Web Service and wait for call back -- > <invoke partnerLink="USAir" portType="line:FlightAvaialbilityPT" operation="FlightAvailability" inputVariable="FlightDetails" /> <receive partnerLink="USAir" portType="line;FlightTicketCallbackPT" operation="FlightTicketCallback" variable="USAirFlightResponse" /> </sequence> </flow> <!-- Select the airline with lowest price (all details are not provided here) -- > <switch> <case condition= "bpws:getVariableData('UnitedAirlinesFlightResponse', 'confirmationData', 'confirmationData/line:Price') <= bpws:getVariableData('USAirFlightResponse', 'confirmationData', 'confirmationData/line:Price')"> <assign> <copy> <from variable="UnitedAirlinesFlightResponse" /> <to variable=" TravelResponse" /> </copy> </assign> <otherwise> <assign> <copy> <from variable="USAirFlightResponse" /> <to variable=" TravelResponse" /> </copy> </assign> </otherwise> </switch> <! Finally return a reply to the customer through a callback -- > <invoke partnerLink="Customer" portType="go:CustomerCallback" operation="CustomerCallback"
120 121 122
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inputVariable="TravelResponse" /> </sequence> </process>
We now briefly discuss the important segments of the code from Listing 16-15.
Lines 1 7
In these lines, we define the top element (process) of this BPEL document. We specify the name (BusinessTravel) of the business process using the name attribute and then we define several namespaces. The most important namespace is that identified by bpws, which corresponds to the BPEL schema and should be part of all BPEL process elements. We also define three additional namespaces specific to this example: hr, line, and go. These correspond to the employee status checking service, the airlines services, and the travel service.
Lines 9 23
These lines are used to define various parties interacting with the business process using the elements partnerLinks and partnerLink. In this sample code, four parties are identified, corresponding to the customer of the business process, the employee travel status service, and the two airlines services. Each partnerLinks element specifies up to two attributes: myRole (which indicates the role of the business process itself) and partnerRole (which indicates the role of the interacting party).
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