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Perl allows for multiple inheritance by allowing an object class to include more than one parent class name in its @ISA array When a method is not found in the package of an object, its parents are scanned in order of their place in the array until the method is located If a parent also has an @ISA array, it is searched too Multiple inheritance is not always a good thing, and Perl s approach to it has problems, but it makes up for it by being blindingly simple to understand Inheritance in Perl can also be dynamic, since @ISA has all the properties of a regular Perl array variable, so it can be modified during the course of a program s execution to add new parent classes, remove existing ones, entirely replace the parent class(es), or reorder them..

Both object classes and object instances may have public and private data and methods. Public data and methods make up the defined interface for the object class and the objects it implements that external code may use. Private data and methods are intended for use only by the object class and its objects themselves (such as supporting methods and private state information). Making parts of an object class private is also known as encapsulation, though that is not an exclusively object-oriented concept. Good object-oriented design suggests that all data should be encapsulated (accessed by methods, as opposed to being accessed directly). In other words, there should generally be no need for directly accessible that is, public data in a class or object. Perl does not have any formal definition of public and private data; it operates an open policy whereby all data and methods are visible to the using package. There is no private declaration, though my can by used to declare file-scoped variables, which are effectively private. Instead, the

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So how do we go about creating those layers There s no One True Way, which some people find very frustrating and others find very liberating. I m going to look at four possible recipes for building the bottom three layers: Control, Business Logic, and Database Access. The four recipes I m going to review sit on a continuum from big, richly functional objects to small, specialized objects. In the ColdFusion world, the latter end of the continuum is the one that seems more familiar to developers, but I hope this article will make you take a closer look at other possibilities as well. I ll walk through each recipe first and then look at some pros and cons of each. We ll start with a familiar recipe, shown in Figure 21-2. For each table in your database, write a bean that represents a row in the table and then write an object that handles the database operations for that bean. We often call this a Data Access Object, or DAO. Next write an object that handles database operations that span multiple rows or multiple tables. We often call this a Gateway Object. Then write an object that contains your business logic for that bean. We often call this a Service Object or a Manager Object. Finally, write a controller that is used to wire the user interface to the service or manager. You ll see this approach in sample applications for frameworks as well as on many blogs and mailing lists.

Note This is not an invitation to a my web server is better than your web server conversation. These are only benchmark tests on my local machine, as well as using each of the web server s default settings.

using package is expected to abide by the intended and documented interface and not abuse the fact that it can circumvent it if it chooses. If we really want to, we can enforce various types of privacy (for example, with a closure), but only by implementing it by hand in the object class. Strangely, by not having an explicit policy on privacy, Perl is a lot simpler than many object-oriented languages that do, because dubious concepts like friend classes and selective privacy simply do not exist.

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