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You ll notice that if you track the memory, it will gradually go up. This doesn t mean you have a memory leak, because the Flash Player s garbage collector allows quite a bit of information to accumulate before trashing it. It errs on the side that more information is better to have at hand so it can be accessed quickly, and that means increased memory usage. That s a good thing! So if just watching memory usage won t tell you whether you have a memory leak, what will Unexpected spikes and dips in this data can suggest a memory leak, but only if you notice corresponding unexpected changes in performance in your game. If your game runs fine, then there s no need to worry about a memory leak. If you think you might have one, use this data to chart a graph and see if you can pinpoint when or how it occurs. Here are the most common causes for memory leaks in AS3.0: Pushing data and objects into arrays and not clearing or limiting data that isn t needed. This is especially true if you re creating objects dynamically, especially in loops. Not removing event listeners when you remove the objects that send them. But there s no need to be paranoid about memory leaks. Most day-to-day code that you write won t ever cause them. Unlike with most other programming languages, memory leaks are a rare occurrence in AS3.0. The Flash Player s automatic garbage collection does a great job of making sure they don t happen.

If the query value is not null and has some value, a synchronized block is entered The synchronized block is important because no two requests should be executing queries at the same time Think of it this way: a client creates an application in which a user could very quickly generate search requests Those two very quickly executed requests could run concurrently but should not Do not make the mistaken assumption that the synchronized block cannot run multiple queries at the same time It can have multiple queries going at the same time What is not possible is to start multiple queries at the same time The problem of starting multiple queries at the same time is that the AsynchronousParent is a session variable that could be associated with multiple web browsers.

GetAddressForNetwork: Takes a single argument of type string to determine which address to return based on the specified network. If the string does not match any networks within the endpoint catalog, the default address is returned; otherwise, the address corresponding to the network name provided is returned. GetCredentialForNetwork: Works in the same manner as the GetAddressForNetwork method, but returns an instance of the .NET Framework s System.Net. NetworkCredential class for the specified network name. SetEndpoint: Takes an argument of the Endpoint class and adds that to its own internal catalog.

In the com.friendsofed.utils package, you ll find the PerformanceProfiler class, which tracks the frame rate and memory usage for you. It returns the average frame rate of the past 60 frames. Here s the class: package com.friendsofed.utils { import flash.utils.getTimer; import flash.system.System; public class PerformanceProfiler { private var _time:uint; private var _previousTime:uint; private var _fps:uint; private var _times:Array = []; public function PerformanceProfiler():void { } public function get fps():uint { //Calculate the frame rate _time = getTimer(); _fps = 1000 / (_time - _previousTime); _previousTime = getTimer(); _times.push(_fps); var average:uint = 0; for(var i:int = 0; i < _times.length; i++) { average += _times[i]; //Make sure that the array doesn't grow //to more than 60 elements if(_times.length > 60) { //Remove the first element from the array //if there are more than 60 elements _times.shift(); } } var averageFps:uint = uint(average / _times.length); return averageFps; }

public function get memory():Number { //Convert the bytes into megabytes var mb:Number = System.totalMemory / 1024 / 1024; //Round to two decimal places var memory:Number = Math.round(mb * 100) / 100; return memory; } } } Use the Array class s shift method to remove the first element in an array.

Remember from previous examples, an HTTP cookie is associated with a URL, and if multiple windows of a web browser reference the same URL, so will the same HTTP cookie Some readers may argue that my code is not efficient enough True, but my objective was to illustrate that when executing requests asynchronously, there is one AsynchronousParent instance associated with one session, which is one cookie that collects all results and multiple queries running at the same time When running in an asynchronous manner, there are concurrency issues to consider that must not be taken lightly Let s get back to the synchronization block After the method processRequest is called, the generated output is a simple success Anything more than a successful result is not required as the Persistent Communications pattern expects results when using the HTTP GET.

The Endpoint class contains the actual details about an endpoint. It has two public properties that allow you to retrieve the address and retrieve or set the credentials required for the endpoint. The Endpoint class also has the methods listed in Table 15-5. Table 15-5. Public Methods for the Endpoint Class