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} With this, if you now attempt to create an instance of the Employee class, you are issued a compiletime error: // Error! Cannot create an instance of an abstract class! Employee X = new Employee(); At first glance it might seem very strange to define a class that you cannot directly create Recall however that base classes (abstract or not) are very useful, in that they contain all of the common data and functionality of derived types Using this form of abstraction, we are able to model that the idea of an employee is completely valid; it is just not a concrete entity Also understand that although we cannot directly create an abstract class, it is still assembled in memory when derived classes are created.

There are a variety of timeout settings in each layer of a LAMP server stack. The importance of lowering timeout settings is that it prevents a slow or unresponsive service from causing a process load pile-up on your web server. It is advisable to decrease all timeout settings as low as you can tolerate. For example, Apache s mod_fcgid has a setting called BusyTimeout, which by default waits for 5 minutes before terminating a long-running PHP process, which you may decrease down to 30 seconds, considering that any page taking longer than 30 seconds to deliver ought to just fail rather than tie up your web server for another 4 minutes. Other key timeouts to consider decreasing include Apache s Timeout setting, PHP s max_execution_time, PHP s default_socket_timeout, Nginx proxy_read_timeout, as well as a variety of Linux kernel TCP settings. One notable PHP process in Drupal that may be allowed to run longer than five minutes is cron.php, which invokes all calls to Drupal s hook_cron(). It is advisable to delegate only fast, simple tasks to hook_cron() and heavier tasks to crontab shell scripts.

Thus, it is perfectly fine (and common) for abstract classes to define any number of constructors that are called indirectly when derived classes are allocated At this point, you have constructed a fairly interesting employee hierarchy You will add a bit more functionality to this application later in this chapter when examining C# casting rules Until then, Figure 6-7 illustrates the core design of your current types..

When a class has been defined as an abstract base class (via the abstract keyword), it may define any number of abstract members. Abstract members can be used whenever you wish to define a member that does not supply a default implementation, but must be accounted for by each derived class. By doing so, you enforce a polymorphic interface on each descendent, leaving them to contend with the task of providing the details behind your abstract methods. Simply put, an abstract base class s polymorphic interface simply refers to its set of virtual and abstract methods. This is much more interesting than first meets the eye, as this trait of OOP allows you

to build easily extendable and flexible software applications. To illustrate, you will be implementing (and slightly modifying) the hierarchy of shapes briefly examined in 5 during the overview of the pillars of OOP. To begin, create a new C# Console Application project named Shapes. In Figure 6-8, notice that the Hexagon and Circle types each extend the Shape base class. Like any base class, Shape defines a number of members (a PetName property and Draw() method in this case) that are common to all descendents.

Drupal does a lot of work in the database, especially for authenticated users and custom modules. It is common for the database to be the cause of the bottleneck. Here are some basic strategies for optimizing Drupal s use of the database.