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JMS defines extensive possibilities for message durability, acknowledgements, and message filtering. Data services extend most of those features to Flex. The default JMS adapter in BlazeDS and LCDS supports these features. In the preceding example, we send text messages, but it s also possible to send object messages. Data services remoting works in association with messaging to serialize and deserialize between Java and ActionScript. JMS in Flex started out by supporting only publish-and-subscribe messaging, but point-to-point communication has now been included. The Flex framework also includes filters and subtopics to allow fine-grained and rule-based message filtering. The Consumer control has a selector property to filter messages, which takes a string value. SQL expressions can also be defined to filter messages. For example, to filter messages based on headerProp, a header property, you could have a criterion like this:

flash.net.SharedObject; flash.text.*; flash.display.Sprite; flash.events.MouseEvent; com.friendsofed.utils.StatusBox; com.friendsofed.utils.EasyButton;

Message headers are accessible via a message handle. They are stored as an associative array and can be modified as required. It s also possible to add newer members to this hash. For example:

Implementing the Client When using metadata-only output from SoapSuds, the client looks a lot different from the previous one. In fact, it closely resembles the examples I show you at the beginning of this chapter. First you have to set a reference to the newly generated meta.dll from the current SoapSuds invocation and indicate that your client will be using this namespace. You can then proceed with the standard approach of creating and registering a channel and calling Activator.GetObject() to create a reference to the remote object. This is shown in Listing 3-25.

[SWF(backgroundColor="0xFFFFFF", frameRate="30", width="550", height="400")]

var message:AsyncMessage = new AsyncMessage(); message.headers = new Array(); message.headers["newProp"] = newValue;

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Listing 3-25. The Client with a Nonwrapped Proxy using using using using using System; System.Runtime.Remoting; System.Runtime.Remoting.Channels.Http; System.Runtime.Remoting.Channels; Server;

This was just a part of the code but it confirms that arbitrary numbers of header manipulations are possible with messages. Selector tags operate only on the headers and not on the message body. An alternative to using selectors is to use subtopics. Whereas a selector evaluates every message through an expression, a subtopic creates subcategories within a destination. The subcategories can be created using specific names. Before sending a message out, a producer sets the subtopic. A small code snippet might look like this:

public class LocalSharedObjects extends Sprite { //Create the shared object. //This creates a "savedData" object that can //contain any saved values. private var _sharedObject:SharedObject = SharedObject.getLocal("savedData"); //Text labels private var _inputLabel:TextField = new TextField(); private var _outputLabel:TextField = new TextField(); //Input and output text fields private var _input:TextField = new TextField(); private var _output:TextField = new TextField(); //Buttons private var _saveButton:EasyButton = new EasyButton("Save", 10, 40, 21); private var _loadButton:EasyButton = new EasyButton("Load", 10, 40, 21); private var _clearButton:EasyButton = new EasyButton("Clear input", 10, 80, 21); //Status box private var _status:StatusBox; public function LocalSharedObjects():void { _status = new StatusBox("LOCAL SHARED OBJECTS"); addChild(_status); //Input label addChild(_inputLabel); _inputLabel.x = 10; _inputLabel.y = 50; _inputLabel.text = "Enter a value:"; //Input text field addChild(_input); _input.x = 10; _input.y = 70; _input.width = 100; _input.height = 15; _input.border = true; _input.background = true; _input.type = TextFieldType.INPUT;

var message:AsyncMessage = new AsyncMessage(); producer.subtopic = "subTopicLevel1.subTopicLevel2.subTopicLevel3 "; producer.send(message);

namespace Client { class Client { static void Main(string[] args) { HttpChannel chnl = new HttpChannel(); ChannelServices.RegisterChannel(chnl); Console.WriteLine("Client.Main(): creating rem. reference"); SomeRemoteObject obj = (SomeRemoteObject) Activator.GetObject ( typeof(SomeRemoteObject), "http://localhost:1234/SomeRemoteObject.soap"); Console.WriteLine("Client.Main(): calling doSomething()"); obj.DoSomething(); Console.WriteLine("Client.Main(): done "); Console.ReadLine(); } } } When this client is started, both the client-side and the server-side output will be the same as in the previous example (see Figures 3-35 and 3-36).

//Output label addChild(_outputLabel); _outputLabel.x = 10; _outputLabel.y = _input.y + 30; _outputLabel.text = "Output:"; //Output text field addChild(_output); _output.x = 10; _output.y = _outputLabel.y + 20; _output.width = 300; _output.height = 100; _output.multiline = true; _output.wordWrap = true; _output.border = true; _output.background = true; //Add and position the buttons addChild(_saveButton); _saveButton.y = _input.y; _saveButton.x = _input.x + _input.width + 20; addChild(_loadButton); _loadButton.y = _saveButton.y; _loadButton.x = _saveButton.x + _saveButton.width + 10; addChild(_clearButton); _clearButton.y = _loadButton.y; _clearButton.x = _loadButton.x + _loadButton.width + 10; //Button listeners _clearButton.addEventListener (MouseEvent.CLICK, clearHandler); _saveButton.addEventListener (MouseEvent.CLICK, saveHandler); _loadButton.addEventListener (MouseEvent.CLICK, loadHandler); } private function clearHandler(event:MouseEvent):void { _input.text = ""; } private function saveHandler(event:MouseEvent):void { //Save the input text in the shared object _sharedObject.data.savedInput = _input.text;

A consumer sets the subtopic at the time of subscription. A subtopic is set before the subscribe method is called. Following is an example code snippet that does this:

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