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You learned previously that web service communication works on the basis of a request and response model. A web service request as well as response consists of SOAP data. This SOAP data is called a SOAP message. Each web method has a message that represents a request for the web method and a message that represents the response from that web method. Thus our HelloWorld() web method will have two messages: The name of the request message is of the form XXXXSoapIn, where XXXX is the name of the web method. Similarly, the name of the response message is of the form XXXXSoapOut, where XXXX is the name of the web method. The WSDL message elements provide a consolidated list of all the messages exposed by the web service. The message names provided by this list are used everywhere else in the WSDL document.

Figure 7-21. The Reply Property Editor 5. In the Reply Property Editor window, specify the name of the Reply component as it will appear in the BPEL process. Also specify to which partner link and operation the component will send a reply. 6. In the Output Variable field, create a new variable or specify an existing variable that will hold the reply message to be transmitted back to the Partner Link. 7. Click the OK button to proceed. At this point, the BPEL process should contain a Partner Link, a Receive component, and a Reply component, as shown in Figure 7-22. The remaining steps you will perform determine how the input variable is checked, what conditions apply, and how the output variable is set.

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Each message in a web service has a specific structure, or schema. This schema is specified by the types element of the WSDL document. If you observe the types section in the WSDL mentioned earlier, you will find that it specifies a schema of two messages: HelloWorld and HelloWorldResponse. You will also notice that the data type of the return value is specified here. This schema closely matches the XSD schema you saw in earlier chapters.

Next, to add a conditional check to the BPEL process, do the following: 1. Click the If component in the Palette window and drag it over the BPEL process. 2. Move the mouse directly below the Receive component and drop the If component into the circle target below the Receive component. Now you need to configure the If component using the BPEL Mapper. 3. Open the BPEL Mapper window by selecting Window BPEL Mapper or pressing Ctrl+Shift+9. 4. To configure the If component to check an input variable and return true if a certain condition is met, click Operator in the BPEL Mapper window menu bar and select EQUAL. The EQUAL element appears in the center section of the BPEL Mapper. It contains two lines with variables any1 and any2, and a third line labeled return Boolean. 5. Select Number Number Literal. This adds a single-line element labeled Number Literal. Double-click the empty line and enter a value, such as 1000. 6. In the left pane, expand the Variables node until you find the OrderId variable. 7. Drag the OrderId variable to the right and drop it onto the any1 line of the EQUAL element. A line connecting the two elements will appear. 8. Click and drag a line between the Number Literal element connecting it to the any2 line of the EQUAL element.

Note When you rename a class or an interface using the Rename tool, Visual Studio does not rename the

A web service consists of one or more operations. In simple terms, an operation is analogous to a function or method. Each operation has an input message (request) and an output message (response). All the operations of a web service are listed under the portType section. The port name is of the form XXXXSoap, where XXXX is the name of the web service class. Thus our sample web service has one operation called HelloWorld. The HelloWorld operation consists of two messages. The input message name is HelloWorldSoapIn, and the output message name is HelloWorldSoapOut. Recollect that these message names were defined earlier in the message section.

9. Click and drag a line between the return Boolean line of the EQUAL element and the Result node in the right pane of the BPEL Mapper window. The final result should look similar to Figure 7-17 (shown earlier).

A binding specifies the message format and protocol for each port type. For example, in our web service there is a binding defined for the ServiceSoap port type. The linking between a binding and port type is the type attribute of the <wsdl:binding> element. The binding name is of the form XXXXSoap, where XXXX is the name of the web service class. Thus our WSDL has a binding defined named ServiceSoap that is for a port type ServiceSoap.

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