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Initializing the map marker position cache is a little trickier. Because there are a small number of items, we do this any time the map rescales or when the model changes (which you see later in Listing 5 18). In either case, we simply clear the cache of markers and then walk the model, projecting each point from its coordinates on Earth to its coordinate on the map using the private function geoToWidgetCoords (not shown here, but available in the sample code that accompanies this book). As you ve seen elsewhere, we simply use the model itself to generate an index for each row in the model, and then extract the latitude, longitude, and quake magnitude from the model using its own data method. With the cache always up-to-date, the map widget s paint function need only draw the base map and then loop over the cache of projected markers, plotting a rectangle for each marker, as you see in Listing 5 17.

Finally, it s a common practice to make the buildfile default target a target named all , which has in its dependencies a list of the targets that represented a full build of the system. If your build process has any non-critical targets that take a fair amount of time to generate, you can create new targets that will do whatever the all target does in addition to any extra work. For example a target that does all and also generates documentation can be called all-with-docs . The point is that you want to minimize the amount of time that it takes to build the application so that developers don t have noticeable interruptions in the flow of their work. A typical all target looks like that shown in Listing 3-15. Listing 3-15. The All Target <!-- =================================================================== --> <!-- Does it all --> <!-- =================================================================== --> <target name="all" depends="compile,..." description="Generates, compiles, packages and deploys." />

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function uses the MD5 Message-Digest Algorithm to calculate the hash value of the value it receives as parameter; it always returns a 32.The uniqid function returns a unique identifier based on the current time in microseconds; its first parameter is the prefix to be appended to its generated value, in this case, the rand() function that returns a pseudo-random value between 0 and RAND_MAX, which is platform dependent. If the second parameter of uniqid is true, uniqid adds an additional combined LCG (combined Linear Congruential Generator) entropy at the end of the return value, which should make the results even more unique.

In short, uniquid(rand(), true) generates a very unique value, which is passed through md5 to ensure that it becomes a random sequence of characters that is 32 characters long. The SetCartId method is used only by the GetCartId method that returns the cart ID. GetCartID first checks to see whether _mCartId has been set, and if not, it calls SetCartId before returning the value of $_mCartId: // Returns the current visitor's cart id public static function GetCartId() { // Ensure we have a cart id for the current visitor if (!isset (self::$_mCartId)) self::SetCartId(); return self::$_mCartId; } Let s also take a look at the GetCartProducts method. This method returns the products in the shopping cart. It receives $cartProductsType as a parameter, which determines whether you re looking for the current shopping cart products or for the products saved for later. If $cartProductsType is equal to the GET_CART_PRODUCTS constant, GetCartProducts will return the shopping cart products. If the $cartProductsType is equal to the GET_CART_SAVED_PRODUCTS constant, GetCartProducts will return the Save for Later products. If $cartProductsType is neither GET_CART_ PRODUCTS nor GET_CART_SAVED_PRODUCTS, the method will raise an error. All the other business tier methods you ve written basically call their associated data tier functions to perform the various shopping cart tasks.

In 2 we learned how to get the Eclipse IDE installed and configured. Now that we have an Ant buildfile it will be ideal if we can achieve harmony between the command line and the IDE. Luckily for us, Eclipse ships with powerful Ant integration. Eclipse provides a great Ant XML editor with syntax highlighting, code completion, flyover evaluation of Ant elements, as well as immediate visual feedback about the validity of your buildfile. For the TechConf application to work seamlessly, you can create an Ant Builder, which is a facility provided by Eclipse's external tools framework for Ant integration. An Ant Builder can be configured to run at specific times. For example, in my environment I configured the Ant build to run when a manual build is invoked or when the project Clean option is selected.

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