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In objects classes that use multiple inheritance, we have to get more involved, since SUPER:: will only call one parent destructor: sub DESTROY { $self = shift; ...destroy our own resources... $self->First::Parent::Object::DESTROY; $self->Second::Parent::Object::DESTROY; } This is a little ugly, however, since it involves writing the names of the parent packages explicitly. If we change the contents of the @ISA array, then this code will break. It also depends on us knowing that the parent object or objects actually have a DESTROY method. A better way to do it is to iterate through the @ISA array and test for parent DESTROY methods: sub DESTROY { $self = shift; ...destroy our own resources... foreach (@ISA) { if ($destructor = $_->can('DESTROY')) { $self->$destructor; } } } We typically want to destroy our own resources before calling parent destructors. This is the inverse order to initialization, where we generally want to call the parents initializers on an object instance before augmenting it with our own initialization logic.

htaccess file is present, incurring multiple operating system call overheads If you are using htaccess files, then consider moving the configuration directives into the main Apache configuration file, which is loaded once only when the HTTP server is started up, or a new HTTPD client is started, instead of on every request If you need to maintain different directives for different directories, then consider wrapping them in the <Directory > </Directory> tags to retain the ability to control specific directories The use of htaccess files may be forced upon you if you are using some limited forms of shared hosting, and don t have access to the full Apache configuration file But in general to maximize performance, you should avoid use of both the files and the configuration directive; indeed you should strive to ensure that the directive is turned off to ensure the maximum performance gain.

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Since writing destructors for object classes in multiple-inheritance scenarios can be more than a little tricky, the NEXT module again comes to our rescue with simplified semantics to make the job a little easier. Essentially we have two strategies: use NEXT in each DESTROY block to redispatch the method search to the next block in line, or rename all DESTROY blocks into ordinary methods and use EVERY in the top-level superclass to call them all. In both cases, the destructors will be called in the correct order, first-to-last and youngest-to-oldest. Here is how we would rewrite the previous example with NEXT: sub DESTROY { $self = shift;

Standard ColdFusion function calls are limited in the way they can pass parameters into a function. All parameters are passed by position, where the physical order of the parameters is important. UDF function calls can pass parameters by position, but they can also pass parameters by name, by data collection, and even by using the cfinvoke tag. Passing parameters by name is a simple change to the way standard functions pass them. Rather than passing the parameters in a specific order, you assign each parameter a variable name in a name=value format. The advantage of this is extra documentation in the UDF function call as well as assigned names for the parameters inside the UDF. For instance, note the two cfset statements in Listing 3-15. Listing 3-15. Two examples of passing parameters <cfset GetAuthor('Michael')> <cfset GetAuthor(name='Michael')>

...destroy our own resources... $self->NEXT::DESTROY(); } Of course, for this to work, all the inherited classes involved must each invoke NEXT::DESTROY or the chain will be broken. The alternative is to create a superclass with a universal destructor in it and have it call all destructor subroutines, now renamed to something else such as destroy: #!/usr/bin/perl # everydestructor.pl use strict; use warnings; { package Ancestor; use NEXT; sub new { return bless {}, ref($_[0]) || $_[0]; } sub DESTROY { print "We'll all"; shift->EVERY::destroy(); } sub destroy { print " we go\n"; } package Parent; our @ISA=qw(Ancestor); sub destroy { print " when"; } package Child; our @ISA=qw(Parent); sub destroy { print " go together"; } } my $object=new Child; When the program terminates, it will print (as its dying action) We ll all go together when we go. This shows that the DESTROY method of Ancestor is called first, then the destroy methods in the correct youngest-to-oldest order, finishing with the Ancestor s own destroy method. Notice that unlike the NEXT-based approach, only the Ancestor package needs access to the functionality of the NEXT module here.

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