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The enterFrameHandler implements the loop that checks for collisions. It also updates the models and checks for stage boundary collisions in a separate loop. private function enterFrameHandler(event:Event):void { //First update the models and check for stage boundary collisions for (var i:int = 0; i < _models.length; i++) { _models[i].update(); StageBoundaries.bounce(_models[i], stage); } //Loop through all the circles and check for collisions for (var j:int = 0; j < _models.length; j++) { //The first model //to use in the collision check var c1:CircleModel = _models[j]; for (var k:int = j + 1; k < _models.length; k++) { //The second model //to use in the collision check var c2:CircleModel = _models[k]; //Check for a collision checkCollision(c1, c2); } } } The loop that updates the models needs to run first so that none of the circles visibly overlap when they collide. This allows the collision to be modeled first, before it s displayed on the stage. Only the result of the collision will be displayed on the stage, you ll never see them overlap. The checkCollision method does the work of finding whether the two objects are actually colliding. Its code is identical to the collision code in the previous example. With just a little more work, you can develop this example into a full-featured billiards game. Add some pockets, graphics for the table, and a scoring system. You could also create a visible vector as a cue to help you align your aim correctly.

Note The ValidationFactory class also has three internal methods CreateValidator,

Then as a larger number is referenced, only the difference between the previously largest value and new large number needs to be calculated But we won t use that approach in this chapter because we would be diverting from using a classic implementation of the Infinite Data pattern The optimizations illustrated for calculating the prime number are optimizations that could be used in the implementation of the prime number task The overall infrastructure would remain identical, and focusing on the optimization would take attention away from implementing the Infinite Data pattern..

This system is very robust. You ll never find that the circles stick together or overlap when they collide, even in very crowded, chaotic situations. This is thanks to accurate separation calculations and the fact that using the MVC framework allows us to model the collisions before we display the results on the stage. As a stress test, give the circles a random radius, create more of them, and add some gravity. Figure 3-25 shows what happens: They fall to the bottom of the stage and politely jostle around a bit until they find a comfortable formation, which is different every time. It has a compelling beauty, and it s easy to forget that this behavior is being produced by nothing more than a few simple algorithms.

CreateValidatorFromAttributes, and CreateValidatorFromConfiguration which take a parameter of System.Type. These methods are marked as internal, and are to be used by the Validation Application

Figure 3-25. Pebbles at the bottom of a riverbed Organic complexity that is the result of objects obeying the logic of the program in unexpected ways.

As already indicated, using the CGI parameter as a task identifier is an example of a necessity practice. Regardless of the client calling the server and using the same task identifier, the same results would be generated. The problem with using a task identifier of 20 is that the task identifier has to be determined by the server, and not the client, adding a wrinkle to the solution. The implementation of the pattern is a server push, without user authentication. Looking back at the Persistent Communications pattern implementation, the server push used authentication, and that would seem to be a conflict in this implementation. The Infinite Data pattern uses a shopping cart approach, where the identification of the user will use an HTTP cookie. Using cookies or authentication is not a necessity, but a nice-to-have feature. Otherwise, anybody can access a specific task. For example, if the URL is /ajax/chap08/PrimeNumberHandler. ashx task=1234, not using an HTTP cookie as an authorization mechanism would allow everybody to retrieve the results for task 1234.