code 39 c# class : SpaceBook in C#

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To further investigate proxies, we ll postulate a rudimentary social networking system called SpaceBook. SpaceBook keeps pages of text that people enter under their login names, so both authentication and lazy creation of pages are required. As suggested in the earlier Illustration section, simply registering for SpaceBook will not give users any space on the system; to gain space, they must first add some content. Therefore, the system should, from the start, enable people to write on others pages. The SpaceBook class looks like this:
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// The Subject private class SpaceBook { static SortedList <string,RealSpaceBook> community = new SortedList <string,RealSpaceBook> (100); string pages; string name; string gap = "\n\t\t\t\t"; static public bool IsUnique (string name) { return community.ContainsKey(name); } internal SpaceBook (string n) { name = n; community [n] = this; } internal void Add(string s) { pages += gap+s; Console.WriteLine(gap+"======== "+name+"'s SpaceBook ========="); Console.WriteLine(pages); Console.WriteLine(gap+"=========================="); } internal void Add(string friend, string message) { community[friend].Add(message); } internal void Poke (string who, string friend) { community[who].pages += gap + friend + " poked you"; } }
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The class maintains a static list of all current users. We use the built-in SortedList class here from System.Collections.Generic and index it with a string, which is the user s name. The constructor enters this SpaceBook object into the collection under the given name. There are two Add methods: one for the user and one to add to another user s pages. Then there is the popular Poke method, which enters a fixed message on another page.
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SpaceBook has one public method, which might be unexpected: the static Unique
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method, which checks whether a name has been used before. It enables us to keep the community list completely private (which it is by default inside the class). Now, we turn to the client. It shows a few tests of activity on Spacebook by Judith and Tom:
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// The Client class ProxyPattern : SpaceBookSystem { static void Main ( ) { MySpaceBook me = new MySpaceBook( ); me.Add("Hello world"); me.Add("Today I worked 18 hours"); MySpaceBook tom = new MySpaceBook( ); tom.Poke("Judith"); tom.Add("Judith","Poor you"); tom.Add("Off to see the Lion King tonight"); } }
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The first user, whom we deduce is Judith, creates a MySpaceBook (not a SpaceBook) and adds two messages to it. Then, Tom also creates a MySpaceBook, pokes Judith, and adds a message to her page and to his page. Note that the neither the client nor the actual SpaceBook system has any authentication code. This will all be handled in the proxy, whose name is now obvious MySpaceBook. The output for the preceding client code is:
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Let's register you for SpaceBook All SpaceBook names must be unique Type in a user name: Judith Type in a password: haha Thanks for registering with SpaceBook Welcome Judith. Please type in your password: haha Logged into SpaceBook ======== Judith's SpaceBook ========= Hello world ================================== ======== Judith's SpaceBook ========= Hello world Today I worked 18 hours ==================================
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2: Structural Patterns: Decorator, Proxy, and Bridge
Let's register you for SpaceBook All SpaceBook names must be unique Type in a user name: Tom Type in a password: yey Thanks for registering with SpaceBook Welcome Tom. Please type in your password: yey Logged into SpaceBook ======== Judith's SpaceBook ========= Hello world Today I worked 18 hours Tom poked you eTom said: Poor you ================================== ======== Tom's SpaceBook ========= Off to see the Lion King tonight ==================================
We can distinguish between the output from SpaceBook itself, which is centered within lines, and the interaction initiated by the proxies.
SpaceBook does not have a constructor, so apart from obtaining a reference, nothing happens when the client instantiates a SpaceBook. The heart of the proxy is here:
public void Add(string message) { Check( ); if (loggedIn) mySpaceBook.Add(message); }
void Check( ) { if (!loggedIn) { if (password==null) Register( ); if (mySpaceBook == null) Authenticate( ); } }
The first point of contact by the client is a call on Add. Add immediately checks the status of the user and takes him through the steps of registering and supplying a password, and then authenticating against this password. Check is also called from the other Add methods and the Poke method. We can now consider the full program, shown in Example 2-4.
using System; using System.Collections.Generic; // Proxy Pattern Example Judith Bishop Aug 2007 // Sets up a SpaceBook page with registration and authentication
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