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Figure 6-8. The shapes hierarchy Much like the employee hierarchy, you should be able to tell that you don t want to allow the object user to create an instance of Shape directly, as it is too abstract of a concept. Again, to prevent the direct creation of the Shape type, you could define it as an abstract class. As well, given that you wish the derived types to respond uniquely to the Draw() method, let s mark it as virtual and define a default implementation: // The abstract base class of the hierarchy. abstract class Shape { public Shape(string name = "NoName") { PetName = name; } public string PetName { get; set; } // A single virtual method. public virtual void Draw() { Console.WriteLine("Inside Shape.Draw()"); } }

Notice that the virtual Draw() method provides a default implementation that simply prints out a message that informs you that you are calling the Draw() method within the Shape base class. Now recall that when a method is marked with the virtual keyword, the method provides a default implementation that all derived types automatically inherit. If a child class so chooses, it may override the method but does not have to. Given this, consider the following implementation of the Circle and Hexagon types: // Circle DOES NOT override Draw(). class Circle : Shape { public Circle() {} public Circle(string name) : base(name){} } // Hexagon DOES override Draw(). class Hexagon : Shape { public Hexagon() {} public Hexagon(string name) : base(name){} public override void Draw() { Console.WriteLine("Drawing {0} the Hexagon", PetName); } } The usefulness of abstract methods becomes crystal clear when you once again remember that subclasses are never required to override virtual methods (as in the case of Circle). Therefore, if you create an instance of the Hexagon and Circle types, you d find that the Hexagon understands how to draw itself correctly or at least print out an appropriate message to the console. The Circle, however, is more than a bit confused: static void Main(string[] args) { Console.WriteLine("***** Fun with Polymorphism *****\n"); Hexagon hex = new Hexagon("Beth"); hex.Draw(); Circle cir = new Circle("Cindy"); // Calls base class implementation! cir.Draw(); Console.ReadLine(); } Now consider the following output of the previous Main() method: ***** Fun with Polymorphism ***** Drawing Beth the Hexagon Inside Shape.Draw()

MySQL is the most common database used with Drupal. MySQL has the ability to cache frequent queries in RAM so that the next time a given query is issued, MySQL will return it instantly from the cache. However, in most MySQL installations, this feature is disabled by default. To enable it, add the following lines to your MySQL option file; the file is named my.cnf and specifies the variables and behavior for your MySQL server (see http://dev.mysql.com/doc/refman/5.1/en/option-files.html). In this case, we re setting the query cache to 64MB: # The MySQL server [mysqld] query_cache_size=64M

Clearly, this is not a very intelligent design for the current hierarchy. To force each child class to override the Draw() method, you can define Draw() as an abstract method of the Shape class, which by definition means you provide no default implementation whatsoever. To mark a method as abstract in C#, you use the abstract keyword. Notice that abstract members do not provide any implementation whatsoever: abstract class Shape { // Force all child classes to define how to be rendered. public abstract void Draw(); ... }

Note Abstract methods can only be defined in abstract classes. If you attempt to do otherwise, you will be issued a compiler error.

The current query cache size can be viewed as output of MySQL s SHOW VARIABLES command: mysql>SHOW VARIABLES LIKE 'query_cache%'; ... | query_cache_size | query_cache_type ...