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Before you can begin using Model-Glue, you need to install the framework. Assuming you ve already installed ColdFusion MX 7 or higher, installing Model-Glue is straightforward. All applications on a single server can share the same copy of the framework, so you don t need to repeat this process each time you begin a new Model-Glue application. Installing Model-Glue also requires the installation of ColdSpring, as the Model-Glue framework uses ColdSpring internally. First, download the latest stable version of each of the two frameworks from http://www.modelglue.com and http://www.coldspringframework.org. Second, unpack the Model-Glue zip file. Inside, you ll find directories named ModelGlue, modelglueactionpacks, modelglueapplicationtemplate, and modelgluesamples. If you re using a standard installation of ColdFusion, you can simply copy the ModelGlue directory into your web server s root directory. If you ve set up virtual servers, or need to use ColdFusion s mapping capabilities, copy the ModelGlue directory to wherever you like and create a ColdFusion mapping with a logical name of /ModelGlue pointing to the ModelGlue directory. If you choose to go with a mapping, and you re using

Earlier in the chapter, we introduced the ErrorClass object class, which encapsulated errno values inside an object. While we could compare the object class as a string or convert it into a number, we had to call methods in the object class to do so. It would be much nicer if this could be handled for us. Here is an extension to the ErrorClass object that does just that. For the sake of this example, we will give it the file name ErrorClass/Overload.pm, though it actually adds overloaded methods to the base ErrorClass object class: # ErrorClass/Overload.pm package ErrorClass; use strict; use ErrorClass; use overload '""' '0+' fallback ); ( => \&error_to_string, => \&error_to_number, => 1,

sub error_to_string { my $class = (ref $_[0]) || $_[0];

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Like the AllowOverride directive just described, the FollowSymlinks option requires extra OS calls to determine if a symlink is present. Turning it off if it is not needed can provide a small benefit in performance.

my $package = __PACKAGE__; $class =~ /$package\:\:(\w+)/ and return $1; } sub error_to_number { return shift->number; } 1; This extension package provides two new methods in the ErrorClass class, error_to_string and error_to_number, which overload the string and numeric conversion operators We have also set the fallback flag to permit conversion methods to be called when no overloaded object method is available Instead of complaining that there is no eq string comparison operation for ErrorClass objects, for example, Perl will fall back to the ordinary string comparison, converting ErrorClass objects into strings in order to carry it out.

ColdFusion 8 or higher, you can create an application-specific mapping in Application.cfc by adding the following line outside any functions, replacing path/to/ModelGlue with the appropriate path for your system: <cfset this.mappings["/ModelGlue"] = "path/to/ModelGlue" /> Finally, take the same approach with the extracted ColdSpring directory. You may place the directory in your web server s root directory (making sure that coldspring is the entire directory name, without any version number or identifier), or copy it wherever you like and create a /coldspring mapping pointing to this location. That s it. The framework is installed.

Without this, we would be able to print out ErrorClass objects and convert them into integers with int, because these are direct uses of the conversion operators, but we would not be able to write a line like this: print "It's not there! \n" if $error eq 'ENOENT'; Without fallback, this operation will fail because the eq operator is not overloaded for ErrorClass objects With fallback, the error will be converted into a string, and then eq will compare it to the string ENOENT In fact, this handles all the string comparison operators, including cmp Similarly, the numeric conversion operation allows Perl to fall back to all the normal numeric comparison operators Here is a modified version of the test script for the ErrorClass module that shows how we can use these new overloaded conversions to simplify our programming with ErrorClass objects: #!/usr/bin/perl # overload.

pl use warnings; use strict; use ErrorClass::Overload; # generate an error unless (open STDIN, "nosuchfile") { my $error = new ErrorClass; print print print print print print } Running this script should produce this output: Error object ErrorClass::ENOENT has number 2 has message 'No such file or directory' Text representation 'ENOENT' Numeric representation = 2 It's not there! "Error object ", ref $error, "\n"; "\thas number ", $error->number, "\n"; "\thas message '", $error->message, "'\n"; "Text represetation '", $error, "'\n"; "Numeric representation = ", int($error), "\n"; "It's not there! \n" if $error eq 'ENOENT';.

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