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In order for an object class to be inheritable, we need to implement it so that it does not contain or refer to any noninheritable elements. Although this takes a little extra work, it pays dividends because we create object classes that can be reused and customized by implementing subclasses that add to and override the methods of the original. In addition, the very act of writing an object class with inheritance in mind helps us develop it more robustly and exposes weaknesses in the design that might otherwise pass unnoticed until much later. The three golden rules for writing inheritable objects are Do not refer directly to class data. Always write constructors to use the passed class name. Never, ever, export anything. A fourth less formal but handy rule of thumb is Work through the passed object. This is a more general form of rule 2, but directed towards object methods rather than constructors. Class methods are off the hook a little here, Since we do not usually expect a class method to be inherited (they work on a class-wide basis), they tend to be more class specific. Having said that, it is better if we can write our class methods to be inheritable too. Finally, a fifth rule of thumb is Call parent constructors as the first substantive act of a constructor.

Figure 6 16. ab results for Listing 6 15 on an Nginx server using default settings The results shown in Figure 6 15 once again show two important items that we need to look at when dealing with optimization: requests per second and time per request. In this result, the time per request for the apache server stood at 8,480.315 milliseconds or 8.5 seconds. That would mean that a user would wait for almost ten seconds for a response from the server before the browser could begin displaying the data. When we compare that figure to the Nginx results shown in Figure 6 16, Nginx had a time per request of 4,575.926 milliseconds or 4.5 seconds, which is 50 percent faster.

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By default, a remote service returns data in Web Distributed Data Exchange (WDDX) format. Few platforms will interpret this data natively. Consider the likely users of your services, and tailor the data to suit them. Simplify the data types where possible. You can usually assume that other Adobe products can interpret more advanced data types returned from a ColdFusion web service, but there are no guarantees when transmitting data between platforms. Err on the side of simplicity to ensure compatibility with the broadest spectrum of clients. For more information about building web services with complex data types, see 13, Web Services and Complex Types by Nathan Mische. ColdFusion 8 introduced new tools for working with JavaScript Object Notation (JSON) data. JSON, a lightweight data format, allows easy interchange between different technology platforms. SerializeJSON() and DeserializeJSON() convert data in and out of JSON format. Remote CFC functions can also export JSON-formatted data instead of WDDX-formatted data by simply setting the returnformat property to "json". You can override this property when you call a function by passing in a new returnformat property. JSON libraries exist for most programming platforms. This makes JSON a great choice for formatting service output data. JSON also integrates easily with JavaScript, which makes it an attractive format for functions that you plan to consume in a browser with AJAX code. For more information about using JSON with ColdFusion, check out 34, Working with JSON and CFAJAXPROXY in ColdFusion by Raymond Camden.

Following this rule ensures that resources are properly allocated by the parent class (or classes) before we do our own initialization. It also ensures that the parent class will not overwrite an attribute after we set it in the inherited class. Of course, we might need to do some initialization to call a parent constructor, but as a general rule of thumb it is a good one to stick to.

As we saw earlier, if we do not want to refer to the same class data in every subclass, we need to take special steps involving symbolic references (though we could also use the qualify_to_ref subroutine provided by the Symbol module) The problem with either approach is that we are committed to that model We cannot choose whether we want to access the original parent s class data or our own version in further subclasses Grandchildren get the grandparent s data or their own, depending on how the parent decides to implement its class data accessors and mutators The solution is to allow the class to be accessed indirectly, through the objects that we build, which we do by building references to the class data as properties of the objects of the class.

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