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So now we ve defined the resource, or URL, and the query string used by the client to call the controller. What has not been defined are which HTTP verbs are used and how to call those HTTP verbs. In terms of patterns in this book, the HTTP verbs can be called by using either

commitOnly: Set to true in case the handler should be called only on committing change events; set to false in case the handler should be called on both committing and non-committing change events. Default is false. useWeakReference: Allows you to decide whether the reference to the host is strong or weak. A strong reference (the default) prevents the host from being garbage collected. A weak reference does not.

The following example holds text input and a simple text component. Once the TextInput is Pre-initialized, it calls the preinitializeHandler, which sets the bindProperty method using the bindingSetter as the setter.

public void pauseApp() { if(myCanvas != null) { setGoCommand(); } if(myGameThread != null) { myGameThread.pauseGame(); } } //---------------------------------------------------------------// implementation of CommandListener /* * Respond to a command issued on the Canvas. * (either reset or exit). */ public void commandAction(Command c, Displayable s) { if(c == myGoCommand) { myCanvas.removeCommand(myGoCommand); myCanvas.addCommand(myPauseCommand); myCanvas.flushKeys(); myGameThread.resumeGame(); } else if(c == myPauseCommand) { myCanvas.removeCommand(myPauseCommand); myCanvas.addCommand(myGoCommand); myGameThread.pauseGame(); } else if(c == myNewCommand) { myCanvas.removeCommand(myNewCommand); myCanvas.addCommand(myPauseCommand); myCanvas.reset(); myGameThread.resumeGame(); } else if((c == myExitCommand) || (c == Alert.DISMISS_COMMAND)) { try { destroyApp(false); notifyDestroyed(); } catch (MIDletStateChangeException ex) { } } } //------------------------------------------------------// error methods /** * Converts an exception to a message and displays * the message. */

the Content Chunking pattern (synchronous) or the Persistent Communications pattern (asynchronous). When calling the resource by using the Content Chunking pattern, the web browser uses the XMLHttpRequest object. A sample HTTP communication scenario is illustrated in Figure 11-5.

< 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"> <fx:Script> <![CDATA[ import mx.binding.utils.BindingUtils; import mx.events.FlexEvent; protected function preinitializeHandler(event:FlexEvent):void { BindingUtils.bindProperty(simpleText, "text", textInput, "text"); } ]]> </fx:Script> <s:layout> <s:VerticalLayout /> </s:layout> <s:TextInput id="textInput" preinitialize="preinitializeHandler(event)" /> <s:SimpleText id="simpleText" /> </s:Application>

public static function bindSetter(setter:Function, host:Object, chain:Object, commitOnly:Boolean = false, useWeakReference:Boolean = false):ChangeWatcher

For a synchronous request, there is a single HTTP GET request The request is made to the controller, and the client waits for the results When the server sends the results, they are sent as a single content block, which in the case of Figure 11-5 happens to be XML The content block sent is the result of applying the Permutations pattern and need not be XML (but could be HTML) In previous implementations of the Permutations pattern, an HTTP filter was used The HTTP filter reacts to all HTTP requests and performs filtering operations on the request but does not process the request Implementing the REST-Based Model View Controller pattern with the Permutations pattern requires a different approach because for the context the HTTP filter approach is long-winded.

void errorMsg(Exception e) { if(e.getMessage() == null) { errorMsg(e.getClass().getName()); } else { errorMsg(e.getClass().getName() + ":" + e.getMessage()); } } /** * Displays an error message alert if something goes wrong. */ void errorMsg(String msg) { Alert errorAlert = new Alert("error", msg, null, AlertType.ERROR); errorAlert.setCommandListener(this); errorAlert.setTimeout(Alert.FOREVER); Display.getDisplay(this).setCurrent(errorAlert); } }

setter: Bind a setter function to a bindable property or chain. Once the ChangeWatcher instance is successfully created, the setter function is invoked with the value or the chain object. host: Represents the source object. chain: Represents the property name.

commitOnly : Set to true in case the handler should be called only on committing change events; set to false in case the handler should be called on both committing and non-committing change events. Default is false. useWeakReference: Allows you to decide whether the reference to the host is strong or weak. A strong reference (the default) prevents the host from being garbage collected. A weak reference does not.