WRITING ALGORITHMS in VB.NET

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CHAPTER 6 WRITING ALGORITHMS
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Ticket only has two data members, _age and _price, which represent the age of the moviegoer and price of the ticket. _age and _price are defined when Ticket is instantiated. The values of _age and _price are retrieved using the properties Age and Price, respectively.
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Calculating Ticket Sales
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When selling movie tickets, ticket sales constitute an important statistic, as they indicate the popularity and success of a movie. In a traditional programming approach, ticket sales are calculated by iterating a collection of Tickets. The total would be generated each time a ticket sales total is requested. Another approach would be to use a closure functor, as shown in the following source code for calculating the total sales of a movie: public class TicketsBuilder { private class StatisticsCounter { private double _runningTotal; public StatisticsCounter() { _runningTotal = 0.0; } public void ClosureMethod( Ticket ticket) { _runningTotal += ticket.Price; } } public static IList<Ticket> CreateCollection() { return new Devspace.Commons.Collections.ClosureAddProxy< Ticket>( new List< Ticket>(), new Devspace.Commons.Functors.DelegateClosure< Ticket>( new StatisticsCounter().ClosureMethod)); } } TicketsBuilder is a class that has a method, CreateCollection, that creates an IList<> instance. The method CreateCollection instantiates the type ClosureAddProxy<>, which implements the Proxy pattern for the closure functor. The parent collection for ClosureAddProxy<> is List<>. The delegate used for the closure functor is StatisticsCounter.ClosureMethod. Like in the comparer functor example, every time an element is added to the returned IList<> instance, DelegateAddClosure<> will call the closure delegate. Each time the closure delegate method StatisticsCounter.ClosureMethod is called, the input price is added to the total ticket sales. The class StatisticsCounter.ClosureMethod has a problem in that it isn t entirely accurate. Imagine the scenario where a person buys a ticket and then asks for his or her money back or decides to watch a different movie. The ticket would need to be removed from the collection, and the total sales variable, _runningTotal, would need to be decremented by the price of the removed ticket. Even if it s impossible to get money back, it isn t possible to use such logic for all applications. The problem of the corrupted data needs to be solved. The reason why ticket sales can only be incremented is because ClosureAddProxy overrides the methods that add elements to the collection. The solution is to use a closure delegate that overrides the remove element methods. As I mentioned earlier, even though it s tempting to merge add and remove closure proxies, I don t
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CHAPTER 6 WRITING ALGORITHMS
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recommend it. When an add closure method is called, it doesn t know it s being called because of an add element operation. To have the closure functor know which operation is currently underway, a direction parameter would have to be added to the closure functor delegate. And that is a very bad idea, because it locks the delegate into certain operations. Following is an example of two closure functors implementing the add and remove element methods: public class TicketsBuilder { private class StatisticsCounter { private double _runningTotal; public StatisticsCounter() { _runningTotal = 0.0; } public void ClosureAddMethod( Ticket ticket) { _runningTotal += ticket.Price; } public void ClosureRemoveMethod( Ticket ticket) { _runningTotal -= ticket.Price; } } public static IList<Ticket> CreateCollection() { StatisticsCounter cls = new StatisticsCounter(); IList<Ticket> parent = new ClosureAddProxy< Ticket>( new List< Ticket>(), new DelegateClosure< Ticket>( cls.ClosureAddMethod)); return new ClosureRemoveProxy<Ticket>( parent, new DelegateClosure< Ticket>( cls.ClosureRemoveMethod)); } } In this modified implementation of TicketsBuilder, StatisticsCounter has two closure methods: ClosureAddMethod and ClosureRemoveMethod. The method ClosureAddMethod increments the ticket sales, and the method ClosureRemoveMethod decrements ticket sales. The method CreateCollection is modified to create two closure proxies: ClosureAddProxy and ClosureRemoveProxy. The appropriate closure method is associated to each proxy.
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