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Let s focus on how the Asynchronous class solves the instance and callback problem. The specific code is illustrated again as follows: function Asynchronous_call(url) { var instance = this; this._xmlhttp.open('GET', url, true); this._xmlhttp.onreadystatechange = function() { switch(instance._xmlhttp.readyState) { case 1: instance.loading(); break; case 2: instance.loaded(); break; case 3: instance.interactive(); break; case 4: instance.complete(instance._xmlhttp.status, instance._xmlhttp.statusText, instance._xmlhttp.responseText, instance._xmlhttp.responseXML); break; EBVN } } this._xmlhttp.send(null); } Asynchronous_call is associated with an instance of Asynchronous because of the prototype definition. Then when the HTML code calls asynchronous.call, the function Asynchronous_call is called and the this instance references the instantiated class. The variable this.xmlhttp is an instance of XMLHttpRequest, and the property onreadystatechange needs to be assigned a function. There is a peculiarity with JavaScript in that if a property is assigned the value of this.somefunction, then what is assigned is a function and not a function associated with a class instance, as was shown by the code that looked like it would work, but didn t. When the method Asynchronous_call is called, the this variable references an instance of Asynchronous. What is happening is that JavaScript is associating a function with an instance. Logically then, if the property onreadystatechange were assigning a function associated with an instance of Asynchronous, then when a callback is made, the this variable should reference an instance of Asynchronous. Figure 2-7 shows that there is no reference to an instance of Asynchronous.

All services can be located in the ServicesCollection object of a composition container. When the Composite Web Application Block attempts to find a service, it first looks in the container of the module for the particular service. If the service is not found in that container, the application block will search the root composition container for the service. This gives you the ability to override the global functionality for particular modules.

Before the dawn of mechanical computing, lookup tables were actually big, heavy, leather-bound books full of nothing but precalculated values. They were used in fields such as surveying and mapmaking, which required frequent reference to complex but predictable trigonometry calculations. Rather than doing the slow and tedious math by hand, you could just look up the answer in the book. Incidentally, the person whose job it was to do this was called a computer !

The Composite Web Application Block contains functionality for setting up rules that define which users can access specific pages. For instance, you may want only administrators to have access to the admin.aspx page of a web application while allowing general access to the rest of the site. The Composite Web Application Block uses two interfaces to implement authorization functionality: IAuthorizationRulesService provides mapping rules to URLs. IAuthorizationService provides the authorization check for a given rule. The Composite Web Application Block also provides an implementation of IAuthorizationService that allows the Enterprise Library Security Application Block (discussed in 11) to authorize users. Using this approach, any authorization provider, including AzMan, could provide these services.

You ll find a simple example of a lookup table in the FastColorExplosion folder. Run the SWF, and you ll see a version of the basic three-color explosion from the beginning of the chapter, as shown in Figure 6-25. This one looks similar, but runs much faster. The particles are displayed using blitting, and their velocities and colors are precalculated in lookup tables.

Figure 2-7. Debugger illustrating that a function does not reference a class instance The debugger shown in Figure 2-7 is distributed with Mozilla, and in the middle window on the left side is a reference to the this variable. The watch window illustrates that this does not reference an instance and is a plain, simple ScriptFunction. This means that even though the original function was associated with an instance of Asynchronous, when used as a callback the reference disappears. A solution would be to cross-reference a request with an Asynchronous instance that is stored in an array that is accessed to identify the request. Such a solution is complicated and relies on some global array. The solution is not a complex cross-referencing algorithm, but the use of a unique implementation detail of JavaScript. Look back at the implementation of Asynchronous_call, illustrated briefly as follows: function Asynchronous_call(url) { var instance = this; this._xmlhttp.open('GET', url, true); this._xmlhttp.onreadystatechange = function() { switch(instance._xmlhttp.readyState) {