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I ve deliberately glossed over a number of terms in the preceding sections that I will now cover in more depth So far I ve generally used DAO and Gateway to indicate separate concepts, and that really dates back to some guidelines that I published in 2003 and updated in 2004, as part of the original Mach-II Development Guidelines (Web Technology Group Mach-II Development Guidelines, http://livedocs adobecom/wtg/public/machiidevguide) Those guidelines were written when object-oriented programming was still a very new concept to most ColdFusion developers, and I was trying to provide simple rules of thumb that would help focus on the object while still providing a pigeonhole for cfquery style results If we look further than the ColdFusion community, we see that although both terms exist, they are actually used almost interchangeably.

This is how we can retrieve the complete ancestry of an object class as a list of packages: my @ancestry = Class::ISA::super_path(__PACKAGE__); Or: my @ancestry=__PACKAGE__->Class::ISA::super_path(); The list returned will contain all the ancestors of the requested package in this case the current package, as determined by __PACKAGE__ It does not contain the UNIVERSAL package from which all objects implicitly inherit, neither does it contain the package for which the request was issued To add the latter, we simply replace super_path with self_and_super_path, or even more simply just prefix the array with the package name For instance, to find the full ancestry of an object: my @full_ancestry=(Class::ISA::self_and_super_path(ref $object), 'UNIVERSAL');.

Figure 6 14. PHP information page with FastCGI PHP installed If everything was properly installed, you should see CGI/FastCGI as the value for the Server API row, as shown in Figure 6 14.

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Alternatively, we can extract a hash of class names and versions; the value of each hash element is derived by calling the VERSION method on each class (which in turn inherits from UNIVERSAL::VERSION and looks for $VERSION if not defined otherwise). The value is undefined if the package does not provide a version: my %versions=Class::ISA::self_and_super_versions(__PACKAGE__); foreach (sort keys %versioned) { print "$_ version ", (defined($versions{$_}) $versions{$_} : "undefined"), "\n"; }

Knowing an object s class and being able to identify its parents does not tell us whether or not it supports a particular method. For polymorphic object classes, where multiple classes provide versions of the same method, it is often more useful to know what an object can do rather than what its ancestry is. The UNIVERSAL class supplies the can method to find out: if ($object->can('method')) { return $object->method(@args); } If the method is not found in either the object s class or any of its parents, can will return undef. Otherwise, it returns a code reference to the method that was found: if ($methodref = $object->can('method')) { $object->$methodref(@args); } We can also use can on an object class to determine whether it or any of its ancestors provides a specified method: foreach (@methods) { $can{$_} = My::Object::Class->can('method'); } Again, the package name may also be given in a string variable. This is permitted even under strict references, though we will need to relax this restriction if we want to actually call the method named in the variable: $result = $package->$methodname(@args) if $package->can($methodname); Alternatively, we can simply try to call the method and see if it works or not, wrapping the call in an eval to prevent it from generating a fatal error: $result = eval {$object->method(@args)}; if ($@) { # error - method did not exist } It is worth noting that this will have quite a different effect if an AUTOLOAD subroutine is present in the class or any parent class. We cover autoloading in object classes later in the chapter.

The term DAO comes primarily from the book Core J2EE Design Patterns by Deepak Alur, John Crupi, and Dan Malks It is intended to be an object that provides all forms of data access for a given business object (or sometimes a group of closely-related objects) It s a natural name to give to such an object, but in other design pattern literature this same pattern is called a Data Gateway or Table Data Gateway (Patterns of Enterprise Application Architecture, by Martin Fowler) In this respect, the second recipe more closely follows the design patterns in common usage outside the ColdFusion community Data Access Object is described as an object that encapsulates a data source and implements the access mechanism required to work with it The data source can be any sort of data provider, including a database, LDAP, or even business service that might be accessed remotely.

The final method provided by the UNIVERSAL object is VERSION, which looks for a package variable called $VERSION in the class on which it is called:

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