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Mongrel is a popular web server that works with Ruby. Mongrel is typically used to serve Rails applications, but it can also be used to host small web servers directly. You can find more information about Mongrel at http://mongrel.rubyforge.org/rdoc/files/ README.html. You ll use Mongrel as a simple XML server in this chapter s example. Of course, you could write a Rails application to serve XML data. But for a simple server, such as one that has only a single URL, that might be overkill. Consider that an empty Rails application on my FreeBSD machine uses 3MB of memory, and, in my experience, Rails applications of any complexity rarely use less than 10MB of memory per process (and often more). For example, if you need a chat server with one connection per user, and you re using a Rails application consuming 10MB or more of memory per user, that memory consumption can add up very quickly. If you have hundreds of users, that becomes a very serious problem. Alternatively, you can often handle your chat connection with a simple server. Using a server like Mongrel will be much faster than using a full-featured Rails server, and you ll be able to serve more clients in the given amount of memory. Of course, Rails takes up memory for a reason: it does numerous great things for you automatically. So if you need features such as sessions or complex templating, you re probably better off creating a Rails application. Nonetheless, for conceptually simple and lightweight purposes, writing a small Mongrel web server is a great way to make your application have less code, take less memory, and run faster.

There are several reasons why you should use objects. The first one is to hide code from the user. The users of the preceding class do not even have to know that there is some kind of initialization going on. They also do not have to know anything about the underlying implementation of the class.

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Because our application centers on the acquisition and display of store information, it makes perfect sense to create a specialized class with properties and methods befitting that unique role. We ll need information stored within that instantiated class that is relevant to store data, as well as methods to fill the class or return information that is associated with this particular object. Let s take a look at the Store class: using System; using AdventureWorks.Core.Data; [Serializable] public class Store { public Store() { // // TODO: Add constructor logic here // } // We only need one property for the purposes of this demo. private string _storename = string.Empty; /// <summary> /// Stores Name /// </summary> public string Name { get{return _storename;} set{_storename = value;} } // Object methods public static StoreCollection GetStoreNames(string searchterm) { // Call the data layer return StoreData.GetStoreNames(searchterm); } } If you take a look at the AdventureWorks.sales.store table, you ll see that there is a lot of information that we could easily bring to the site. However, for the sake of simplicity, we ll just narrow that down to using the store Name column. Inside of our business object, we have only one property, Name. Notice that we also have a single object method as well. GetStoreNames() returns a StoreCollection object that we ll fill in our data layer call, StoreData.GetStoreNames(). It s a good idea to include your object s data access calls within the business objects as static calls as well, so as to adhere to a uniform method of calling various retrieval processes.

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