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Suppose you are a technology executive who has a large portfolio of personal investments, which you actively manage and trade. You want a tool that lets you easily track your investments on your desktop, and you aren t happy with the existing utilities. You do a little digging, and discover that your online stock broker, Fidelity Investments, allows you to download your stock portfolio in CSV format. So you decide to write a tool to extract the data and display it in a ticker format on your desktop. You routinely download your portfolio into a CSV file on your computer at home, which allows you to import the data into various tools, such as your financial planning application. However, you would also like to track your stock s progress at work, and you don t want your IT staff to know the details of your portfolio. Since the IT staff routinely monitors traffic, you don t want to log in directly to your Fidelity account or, for that matter, any of the other financial trackers you might use. You don t mind that the stock symbols themselves are available, since they say nothing about the total size of your investment. To meet your needs, you ll create a simple XML server to get the data and a graphical stock ticker to display updates. For this example, you ll need a Fidelity CSV file. If you have a Fidelity account, you can get a Fidelity CSV file by logging in, clicking an appropriate account, and clicking Download. If you don t have a Fidelity account or would prefer to use other data, you can download a sample file from the Source/Downloads area of the Apress web site (http://www.apress.com) or http://rubyreporting.com/examples/example_fidelity.csv.

Users of the class are insulated from the implementation, which provides the programmer with the ability to change the underlying implementation without affecting users of that code. This idea, known as data hiding and encapsulation, is an important feature of OOP.

To create the server, you need three gems installed: mongrel, fastercsv, and remarkably. FasterCSV, introduced in 7, is a fast CSV-parsing library for Ruby. Remarkably is a library designed to help you output XML using Ruby code. It s loosely based on the Markaby library, which was also introduced in 7. You can install the gems as follows:

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As you can see, the data access call is relatively transparent and low key, and will typically be so. The code should only concern itself with the actual object call. Any data manipulation should be handled on the data layer before being passed back to the business tier. In this particular example, we re using a StoreCollection as the informational transfer object.

This encapsulation promotes code reuse. Users of the preceding class do not have to worry if I change the implementation as long as the methods stay the same. I could rewrite the class to use a hardware random number generator, if available; the users of the class will not be affected. Object-based encapsulation is conceptually the same as the OCaml module system s capability to hide data and functions. Another way that OOP promotes code reuse is via the inheritance mechanism. Inheritance is when a class inherits the methods and values of a parent class. You will learn about this in much greater depth later in this chapter. Finally, OOP should be used when objects are the best way to express a solution. There are times when you are working with things that might have data attributes and actions that they can perform. Problems in which you are working with objects are sometimes best solved by using objects. It is important to remember that much of the functionality provided by objects in more traditional object-oriented languages can be implemented by using the OCaml module system. OCaml enables you to make methods and data members private, although privacy is also available via the module system. In OCaml, it is not an either/or situation with regard to modules and objects. You can use objects within modules. As always, you should use the tool that enables you to accomplish your goals.

Then create the XML server script shown in Listing 9-1.

It is quite possible that we will need to access more than just one store object from within our program. Our immediate solution to that is to implement a custom collection. We could, of course, use Generics as a choice for storage of the serializable class, but for now let s just stick to the collection class: using System; using System.Collections; using System.Xml;

The class keyword behaves much like the function keyword; it tells the compiler that the next segment of code describes a class. The object keyword marks the beginning of the class definition. The object keyword can take an argument, which is the name of this class (similar to the this keyword in Python or C++). # class showingthis = object(self) val a = 10 method print_a = Printf.printf "%i\n" a method call_method = self#print_a end;; class showingthis : object val a : int method call_method : unit method print_a : unit end This is a pretty simple class having one data member and two methods (a function in a class is called a method). The signature indicates that it is an object and shows the type information for the internal data. You create an object (commonly referred to as instantiating an object) by using the new keyword.

Listing 9-1. Fidelity Investments XML Loader and Server (xml_server.rb)

# let b = new showingthis;; val b : showingthis = <obj> # b#call_method ();; Characters 0-13: b#call_method ();; ^^^^^^^^^^^^^ This expression is not a function, it cannot be applied # b#call_method;; 10 - : unit = ()

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