visual basic barcode generator Miscellaneous Elements in Java

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Miscellaneous Elements
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The elements in this category are usually the first few elements in a BPEL document. Therefore, we will discuss these elements first. We start out by discussing the process element.
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The process Element The process element is the first element of a BPEL document. It defines the name of the process and the various namespaces used in the BPEL document. An example of this element is shown in Listing 16-1. This process element has a name attribute that is used to specify the name of the process. In this listing, we have named the process BusinessTravel. The next attribute is the target namespace;
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then we define the various namespaces we will need to complete the BPEL document.
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Listing 16-1
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Listing 16.1 : An example of process element 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:travel=http://myCompany.com/bpel/travel/ 6 xmlns:airline=http://myCompany.com/service/airline/>
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The partnerLinks Element
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This element is used to define the different parties that interact with the BPEL process. These parties include all the Web Services that will be invoked and the client of the process. The partnerLinks element can have one or more subelements called partnerLinks. Each of these subelements specifies one party with the name attribute. In addition, each of these subelements has two other attributes: myRole, which indicates the role of the business process itself, and partnerRole, which indicates the role of the party. Listing 16-2 provides an example of the partnerLinks element. This particular example has two subelements corresponding to two parties the client and an airline.
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Listing 16-2
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Listing 16.2: Example of partnerLinks element 1 <partnerLinks> 2 <partnerLink name="client" 3 partnerLinkType="travel:travelLT" 4 myRole="travelService" 5 partnerRole="travelServiceClient"/> 6 <partnerLink name="myAirline" 7 partnerLinkType="airline:flightLT" 8 myRole="airlineCustomer" 9 partnerRole="airlineService"/> 10 </partnerLinks>
The variables Element This element is used to define the variables used to store, reformat, and transform messages. Commonly one variable is defined for each message sent to or received from a Web Service. Note that variable is a subelement, and you can have as many of these subelements as you need. Listing 16-3 shows some sample code for this element. In this example, two variables are defined. Each of the subelements has two attributes: name, which is used to identify the variable, and messageType, which indicates the type of the message. The message types are usually defined separately, usually in a WSDL document or XML schema.
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Listing 16-3
Listing 16.3: Sample code for element variables 1 <variables> 2 <variable name="TravelRequest" 3 messageType="travel:TravelRequestMessage"/> 4 <variable name="FlightDetails" 5 messageType="airline:FlightTicketRequestMessage"/> 6 </variables>
Primitive Activities
The various activities included in this category are invoke, receive, assign, throw, and wait, as shown earlier in Figure 16.3. We discuss each of these activities, starting with the invoke activity.
The invoke Activity Invoking an operation on a service is a basic activity. Such an operation can be a synchronous request/response or an asynchronous one-way operation. BPEL4WS uses the same basic syntax for both, with some additional options for the synchronous operation. An asynchronous invocation requires only the input variable of the operation because it does not expect a response as part of the operation. A synchronous invocation requires both an input variable and an output variable. The basic syntax for the invoke activity is shown in the sample code of Listing 16-4. This sample code is used to synchronously invoke a service because both the inputVariable and outputVariable attributes are specified. The service operation name has to be specified as well as the portType attribute value. In addition, the partnerLink attribute value has to be specified. Listing 16-4
Listing 16.4: Sample code for invoking a synchronous operation on a service 1 <invoke partnerLink="employeeTravelStatus" 2 portType="employee:EmployeeTravelStatusPT" 3 operation="EmployeeTravelStatus" 4 inputVariable="EmployeeTravelStatusRequest" 5 outputVariable="EmployeeTravelStatusResponse" />
The receive Activity
A business process provides services to its partners through receive activities and corresponding reply activities. A receive activity specifies the partner link it expects to receive from, as well as the port type and operation it expects the partner to invoke. In addition, it may specify a variable that is to be used to receive the message data. However, this attribute is syntactically optional because it is absolutely required only in executable processes.
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