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</person> <person> <id>4</id> <firstName>Ying</firstName> <lastName>Chen</lastName> <country>China</country> </person> </peopleCollection>
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That takes care of the data on the server side Let s now configure these classes with data services. Once we have done that successfully, we will move on to consuming this remote data by calling remote methods from the Flex client. We get into the WEB-INF/flex directory and open remoting-config.xml. You already know that remoting-config.xml is one of the constituent files of services-config.xml, which configures the message broker servlet and allows data services to deliver the expected functionality. We configure the PeopleCollection object as a remoting destination so that it becomes accessible from the Flex client. Here is the snippet from remoting-config.xml:
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<service id="remoting-service" class="flex.messaging.services.RemotingService"> <adapters> <adapter-definition id="java-object" class="flex.messaging.services. remoting.adapters.JavaAdapter" default="true"/> </adapters> <default-channels> <channel ref="my-amf"/> </default-channels> <destination id="peopleCollection"> <properties> <source>advancedflex4.ch07.remoting. PeopleCollection</source> </properties> </destination> </service>
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The adapters and default channels we use here were preconfigured with the BlazeDS distribution. It s possible to configure additional adapters and modify the default channels. The piece we add to this configuration file is the one that defines the destination. That configuration maps a logical name (handle) to the class, identified by the fully qualified class name, which holds the collection of persons. In Flex, the logical name will be referenced from within RemoteObject to invoke methods on this class. If you are familiar with any distributed computing technology like web services, EJB, COM, CORBA, or any other RPC-supporting technology, you will find this extremely familiar in approach and style. A destination allows many more property settings beyond the essential source property determination. One of these is the scope property, which takes three valid values: Application, Session, and Request. Application-scoped remote objects get bound to the ServletContext and are available to the entire web application. Session-scoped objects are bound to a FlexSession instance, which abstracts the session of the current conversation. Request-scoped objects are instantiated on each invocation. Other properties
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commonly used are the attribute-id and the factory properties. Object instances are bound to the name specified as the value of the attribute-id property. The factory property specifies the factory that creates the object. In the case of managed components, this property plays a major role. Later in the chapter, in the section Creating custom factories, you will see this being used. On the Java server side we are done, except for compiling the code and copying the class files over in the proper directory structure, which maps to the package structure, to WEB-INF/classes. This is how BlazeDS would be able to load these classes. It is a standard Java web application requirement to have the compiled Java classes available either in the WEB-INF/classes folder or as a packaged archive in the WEB-INF/lib folder for it to be available to the web application. The last part of this example is the Flex application code, which calls the remote methods, gets the data across the wire, and populates a data grid with that data. For now, all of this is put in a single MXML file. The source of that MXML file is as follows:
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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/mx" minWidth="955" minHeight="600" applicationComplete= initApp() > <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> <mx: RemoteObject id="ro" destination="peopleCollection" result="resultHandler(event)"/> </fx:Declarations> <fx:Script> <![CDATA[ import advancedflex4.ch07.remoting.Person; import mx.rpc.events.ResultEvent; import mx.collections.ArrayCollection; import mx.controls.Alert; [Bindable] private var items:ArrayCollection; private function initApp():void { ro.getPersons(); } private function resultHandler(event:ResultEvent):void { items = event.result as ArrayCollection; var length:int = items.length; } ]]>
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</fx:Script> <mx:DataGrid dataProvider="{items}" /> </s:Application>
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RemoteObject maps to the PeopleCollection Java class via a destination, which we configured in remoting-config.xml. In the preceding MXML file, we could call the getPersons method of the PeopleCollection class using the remote object handle. If we wanted to manipulate the data further and manipulate the items in this collection, we could do that, because each of the items in the collection is a Person object that has a type association in AS3. In the interest of keeping our focus on the basic mechanics of remoting, I will avoid discussing any details of such business logic. However, the code for the application contains an implementation for updating the collection, adding new items and deleting existing ones, and sorting items in the collection. You can peruse the source code to understand how it s implemented. Now that you have seen a basic remoting example, the next section builds on this knowledge to cover two important related topics:
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