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Figure 7-7. Specifying the WSDL URI 4. The tool quickly introspects the WSDL and shows the available operations in the next screen, as you can see in Figure 7-8.
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Figure 7-8. Web service operation endpoints as deciphered from WSDL 5. Next, click Finish to generate the required ActionScript classes. Note that you can deselect services for which you don t want to generate stubs. You can also select a different service and port. In this simple example that validates ISBN numbers, there is only one service and port pair to choose from. The service offers two operations and you can include both or just one. We choose to generate stubs for both the operations. The classes are all generated and are within the specified package structure in the project source folder. Pairs of base and extended classes are generated for the service operations. This allows custom extensions and behavior override in the subclasses, without impacting the generated base classes.
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If you need to, you can update the generated classes by adding, deleting, and modifying existing entries. The automated process generates these classes:
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_Super_Isbnservice.as Isbnservice.as
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These classes are now ready to be consumed and bound to user-interface components. When you create the Flex project, an MXML application file is created. We like to name this primary application class main.mxml, but that s not required. If you wish to name it something else, you are free to do so. In main.mxml, we first include a set of user interface components and then bind the service to these components. You include a TextInput to allow users to enter an ISBN number, a TextArea to display the validation result (a Boolean value, either true or false), and a Button to invoke a web service call. The components can be included programmatically or by using design mode. In order to leverage the Flash Player data-binding features, switch to design mode and right-click the TextArea to bind it to the result of a web service call. In this small example, we ll validate a 13-digit book ISBN. We ll set the argument value to the ISBN of this book (AdvancED Flex 4), which is 9781430224839, entering this value through the TextInput component. The application has a button, labeled Validate ISBN. Clicking the Validate ISBN button invokes the web service operation to validate the entered ISBN. The result of the call is bound to the text area, where you can see if the ISBN is valid or not. Things will become clearer as you look through the code:
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< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768" xmlns:isbnservice="services.isbnservice.*"> <fx:Script> <![CDATA[ import mx.controls.Alert; protected function button_clickHandler (event:MouseEvent):void { IsValidISBN13Result.token = isbnservice.IsValidISBN13(enterIsbnTextInput.text); } ]]> </fx:Script> <fx:Declarations> <s:CallResponder id="IsValidISBN13Result"/> <isbnservice:Isbnservice id="isbnservice" fault="Alert.show(event.fault.faultString + '\n' + event.fault.faultDetail)" showBusyCursor="true"/> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <s:TextArea x="235" y="120" height="32" id="textArea" text="{IsValidISBN13Result.lastResult}"/> <s:TextInput id="enterIsbnTextInput" x="269" y="56"/> <s:Button id="validateIsbnButton" click="button_clickHandler(event)" x="287" y="87" label="Validate ISBN"/> </s:Application>
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Although this is a simple example, you can see that consuming web services using the introspection tool is quite appealing. If you d like to go the traditional route, you could use the <mx:WebService /> tag. If you use this tag, you need to know in advance the callable remote methods or procedures, exposed as web service endpoints. This can be done using some means of introspection or by the crude method of browsing the port type definitions in WSDL. If the WSDL exposes very few methods, you can probably physically look it up fairly easily; otherwise, it could be a tedious effort. The rest of the logic, which involves
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service invocation, and result handling, is hardly different from the previous method. As always in Flex, the service has two events it can dispatch: result and fault. If the call goes through successfully, your result handler populates the text; otherwise it errors out. Let s morph the existing example within this style.
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< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768" xmlns:isbnservice="services.isbnservice.*"> <fx:Script> <![CDATA[ import mx.controls.Alert; import mx.rpc.events.FaultEvent; import mx.rpc.events.ResultEvent; import mx.rpc.soap.LoadEvent; [Bindable] private var resultString:String; private function loadHandler(event:LoadEvent):void { trace("in loadHanlder: WSDL Loaded"); trace("in loadHandler: " + event.wsdl.xml); } private function resultHandler(event:ResultEvent):void { resultString = event.result as String; trace("in resultHandler: passed in argumnent " + enterIsbnTextInput.text); trace("in resultHandler " + resultString); } private function faultHandler(event:FaultEvent):void { resultString = event.fault.faultString; Alert.show("in faultHandler " + resultString); }
]]> </fx:Script> <fx:Declarations> <mx:WebService id="myISBNWebService" wsdl="http://webservices.daehosting.com/services/ isbnservice.wso WSDL" load="loadHandler(event)" result="resultHandler(event)" fault="faultHandler(event)" /> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <s:TextArea x="235" y="120" height="32" id="textArea" text="{resultString}"/> <s:TextInput id="enterIsbnTextInput" x="269" y="56"/> <s:Button id="validateIsbnButton" click="myISBNWebService.IsValidISBN13 (enterIsbnTextInput.text)" x="287" y="87" label="Validate ISBN"/>
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