The destination is what points to the Hessian server endpoint or gateway. By specifying only remoteDestination, you are implying a relative path from the SWF application path. Therefore, a SWF application at a path of the type http://domain:port/approot/MyApp.swf, wanting to access the Hessian endpoint at http://domain:port/approot/remoteDestination, would specify the destination as remoteDestination. Fully qualified URLs can also be assigned as values to the destination property. If the domain of the Hessian endpoint and the SWF are different, the Flash security restrictions apply; don t forget to put a crossdomain.xml file at the remote server root, appropriately configured as necessary. In your Flex application code, you invoke the remote methods with the configured HessianService handle. So a call to joinString would look somewhat like this:

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Figure 5-25. With the help of the Star Tool and BLine tool, your bouncing ball is now a bouncing smiley face. The BLine tool isn t yet as sophisticated as the Bezier tools found in Inkscape. Even so, with time and effort, it s possible to build up much more complex animated sequences and add sound files and visual effects to convey your message more dramatically.

[and] a class is a set of objects which have exactly the same internal structure and therefore the same attributes and the same methods [But if all objects in a class have the same attributes and the same methods,4 is not that class a type, by the authors own definition ] The class defines the implementation of a set of objects, while a type describes how such objects can be used (Contrast the ODMG specification, incidentally see R G G Cattell and Douglas K Barry (eds), The Object Data Standard: ODMG 30, Morgan Kaufmann, 2000 which uses the terms type and class in almost exactly the opposite way) The authors [ie, Bertino and Martino] then go on to say: With inheritance, a class called a subclass can be defined on the basis of the definition of another class called a superclass.

hessianService.joinString.send(firstStringParam, secondStringParam);

Surely in accordance with their own earlier definitions they should be talking in terms of types here, not classes And then they add: The specification hierarchy (often called subtype hierarchy) expresses .. subtyping relationships which mean that an instance of the subtype can be used in every context in which an instance of the supertype can correctly appear (substitutability) Observe that they do now speak of types, not classes .. [Also,] observe the failure to distinguish properly between values and variables (note the fuzzy talk of instances ), and the consequent failure to distinguish between value substitutability and variable substitutability..

A call to the Hessian service is asynchronous, where the send method maps to mx.rpc.AbstractOperation.send(), so you need to use the AsyncToken and a callback handler to get the response. The callback handler can be any class that implements the mx.rpc.IResponder interface. The IResponder interface defines two methods, result and fault. On a successful result, the result callback method is invoked, and on error, the fault callback method is invoked. Very simplistically, you could do this:

When you re happy with the preview of your animation, you can render and export it in various formats by choosing File Render on the chevron menu (in the upper-left corner of the canvas window); see Figure 5-26. A series of PNG stills is compatible with other graphics programs, although it isn t much use for watching the animation directly. Alternatively, you can export to .gif for a webpage or .dv if you re working with material from a video camera, as discussed in a later chapter. DV format is certainly good quality, but the files are comparatively large.

3. I quoted from this annotation in my original paper, too. 4. I prefer the term operator, but method is much more common in the object world, and so I ll use it here.

var token:AsyncToken = hessianService.joinString(firstStringParam, secondStringParam); token.addResponder(IResponderImplClass);

Of course, it is precisely because of confusions, terminological and otherwise, such as those just illustrated that we felt free or compelled, rather to introduce our own terms in The Third Manifesto and to define them as carefully as we could Back to the sentence from the Tockey article My next complaint is sloppiness, as evidenced by the phrasing substitute any subtype of class [= type ] X To be specific, the author is talking about substituting a subtype as such, when presumably what he should be talking about is substituting an object of the subtype in question This is not just a quibble! As I wrote in my original article, our own model of types and inheritance is based on the four classical and, we hope, widely understood concepts type, value, variable, and operator.

Now when the response comes back, you ll receive it in the result(event:Object) method. In the IResponderImplClass, you would take event.result and get the response-concatenated string from it. We ve kept this example simple to help you stay focused on understanding the main ideas instead of getting lost in the details.

Figure 5-26. Synfig Studio offers a variety of export formats. The format you choose depends on the intended use for the animation.

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