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$self->{'_next'} = $nextref; $self->{'_incr'} = $incrref; } # private method to set serial number sub _set _serial { $self->{serial} = shift; } We have avoided implementing a method to set the serial number up to now because it is not a feature we want to allow publicly. Therefore, we have given it a leading underscore and called it _set_serial to emphasize that it is for the use of subclasses only. The underscore prefix is only a convention, not a requirement, but it is a commonly used one. The method to set the class data is similarly only for the use of subclasses, so we have called it _set_config. The subclass constructor can now be modified to use these methods, resulting in this new, correctly object-oriented, constructor: # part of MySerial.pm sub new { my $class = shift; # call Serial::new my $self = $class->SUPER::new(@_); # override parent serial with our own $self->_set_serial($next); # replace class data references $self->_set_config(\$next, \$plus); # add a creation time $self->{time} = time; return $self; } Not only is this more correct, it is simpler to understand too. It is not quite perfect though the time attribute assumes that the Serial class uses a hash as its underlying representation. We may be happy to live with that, but if we wanted to fix that too, we could make use of the private _property method we created earlier in the section Generic Accessors/Mutators for the easy creation of, and access to, attributes. By adding this method to the Serial class, we could then replace the line setting the time attribute: $self->{time} = time; to $self->_property(time => time);

Avoiding exports from object classes almost goes without saying. If we export any variable or subroutine from an object class, it is accessible from outside the method calling scheme, breaking the design. Avoiding exports is, of course, very easy; we just don t do it. In particular, the Exporter should not be used.

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A private security function would be called at the top of every service method to validate the token For a valid token, the service function executes as expected Otherwise, the function can abort The security check function should also update the token s last access time After a short period of inactivity 15 minutes or so the token expires, and further requests with that token fail Listing 22-5 shows an example of this authentication system Listing 22-5 Some authentication functions <cffunction name="Login" access="remote" returntype="string" hint="Returns a session token if username and password is valid"> <cfargument name="Username"> <cfargument name="Password"> <cfset var my = StructNew()> <cfset mySecurityToken = "FAILED"> <!--- Call custom function to validate supplied credentials ---> <cfif CredentialsAreValid(username=argumentsUsername, password=argumentsPassword)> <!--- Call custom function to create a new token for the user in the database ---> <cfset mySecurityToken = CreateNewSecurityToken(username=arguments.

There is one exception to this rule, however, which comes about when we design an object class to be used both with objects, and with a functional interface, as the CGI module does. Here we generally use a default object created inside the package as global data (that is, a singleton), and use it whenever an explicit object is not passed to us. To do that requires writing the required methods so they can also be called as functions. For example: package My::FunctionalObject; use strict; use Exporter; our @ISA = qw(Exporter); our @EXPORT_OK = qw(method_or_function); my $default_object = new My::FunctionalObject; sub new { ... } sub method_or_function { my $self = (ref $_[0]) shift:$default_object; return $self->do_something_else (@_); } This hypothetical method relies on the fact that, if called as a function, its first argument will not be a reference. It uses this fact to test whether it had been called as a function or method, and it sets $self to be either the passed object or the default object accordingly. So long as we design all our methods/subroutines so that the first argument passed in the argument list can never be a reference, this technique will work very well.

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