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where Arguments was a structure of all of the arguments passed to the DAO method. With composition, we have the benefit that if the DAOHelper.getbyFilter() API changed, we might need to edit only the getbyFilter() methods in our other DAOs, rather than in every single place that called those DAOs (simplifying maintenance). The downside of composition is that now we re back to having to put a simple implementation of every single method into every single DAO, which is a lot of typing. It also means that if we want to add a new method to our DAOs, we must add a simple wrapper method to every single DAO. While we should usually favor composition over inheritance, in this case, inheritance is the appropriate tool for the job. How do I know when to use inheritance rather than composition I like my code to pass three key tests: Is it a DAO A product DAO very clearly is a DAO that is the essence of what it is and does. Are the functions I am inheriting cohesive with the intent of the class For example, an order should be able to return its status, but should it really know how to send an e-mail when its status changes Clearly, the ability to perform create, read, update, and delete (CRUD) operations is essential to a DAO, so the base methods are cohesive. Is the API to the methods likely to change If it is likely to change, I will use composition to hide the likely interface changes within the composing class. In this case, the API to the base methods is my core DAO API and is very unlikely to change, so I am comfortable exposing those classes through inheritance, rather than encapsulating them with composition

The only job of this class is to provide a constructor for initializing objects in classes that use this style of multiple inheritance: package Multiply::Inheriting; use NEXT; sub new { my $class = shift; $class = (ref $class) || $class; my $self = bless {}, $class; $self->EVERY::LAST::initialize(@_); return $self; } 1; Now all classes that want to make use of this style of multiple inheritance can simply use it and not define a constructor themselves package Game::Card; use Multiply::Inheriting; our @ISA=qw(Multiply::Inheriting); #inherit 'new' sub initialize { my ($self, $name, $suit) = @_;.

33 25 17 10 6 2 2 2 2 1 100

$self->{name} = $name; $self->{suit} = $suit; } ... For an example of where we would use EVERY instead of EVERY::LAST, see the section Destroying Objects later in the chapter.

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We can also use the NEXT pseudoclass, also provided by the NEXT module, to write methods that will restart the method search as if they had not been found in the first place This allows a parent class to decline a method if it determines that it cannot satisfy it Done correctly, this can get classes in the same inheritance tree to cooperate in cases where a method call handled by the first class found would be more appropriately handled by the second Clearly getting this right can be very tricky, which is why multiple inheritance is often considered a bad idea in many circles.

We can classify most methods with only a few method types. For example, getProductsinCategory() and getNewestUsers() are really just types of getbyFilter(). getUserbyEmail() and getProductbySKU() are really just types of getbyAttribute(). As you become more comfortable working with base classes, you can replace most of your custom methods with a couple of static parameter or runtime property settings and a call to a base method. For example, if you had a getbyAttribute(AttributeName, AttributeValue) base method, you might have a getProductbySKU() method (Listing 23-7). Listing 23-7. getProductbySKU() method <cffunction name="getProductbySKU" returntype="query" output="no" hint="I return a recordset containing the product with the requested SKU."> <cfargument name="ProductSKU" type="string" required="yes" hint="The Product SKU"> <cfreturn variables.getbyAttribute( "SKU" , arguments.ProductSKU )> </cffunction> As you substitute parameters and base method calls for your methods, it becomes much easier to use metaprogramming to generate those methods. But what is metaprogramming, and how can you use it

The following short example illustrates the general idea: #!/usr/bin/perl use strict; use warnings; use NEXT; { package First::Parent; sub new { print __PACKAGE__,"\n"; shift->NEXT::new(@_); }; package Second::Parent; sub new { print __PACKAGE__,"\n"; return bless {},__PACKAGE__ }; } package Child; our @ISA=qw(First::Parent Second::Parent); my $obj=new Child; When run, this program will print out First::Parent Second::Parent The new constructor in the second parent actually constructs the object, but it is not called directly Instead, the constructor in the first parent is found by the method call, but it is then redispatched, locating the second As with EVERY, this is actually the work of a very clever AUTOLOAD routine rather than any native intelligence of the interpreter itself.

NEXT operates very much like SUPER does, except that it uses the context of the original class called to search adjacent sibling classes rather than only parent classes of the class in which it is invoked Unlike SUPER, however, NEXT does not consider a failure to find a next class a fatal error This allows several classes to dispatch onwards without worrying about whether there is a next method or not If we want NEXT to behave like SUPER, we can instead use NEXT::ACTUAL, which will, like SUPER, generate a fatal error if there is no next method to dispatch to A good example of where this is useful is in AUTOLOAD methods, as we will see shortly.

Note that if a grandparent class is inherited twice via different parent classes into the same subclass, NEXT can cause it to be called twice, once for each chain of ancestry between it and the child This is called diamond inheritance and is almost always a very bad idea, indicating structural.

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