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Perl::Metrics - The Perl Code Metrics System
# Load or create the metrics database
use Perl::Metrics '/var/cache/perl/metrics.sqlite';
# Index and process a directory of code
Perl::Metrics->process_directory( '/home/adam/code/mycpan' );
The Perl Code Metrics System is a module which provides a Perl document
metrics processing engine, and a database in which to store the
resulting metrics data.
The intent is to be able to take a large collection of Perl documents,
and relatively easily parse the files and run a series of processes on
The resulting data can then be stored, and later used to generate useful
information about the documents.
Perl::Metrics consists of two primary components. Firstly, a
Class::DBI/SQLite database that stores the metrics informationg.
See Perl::Metrics::File and Perl::Metrics::Metric for the two data
classes stored in the database.
Secondly, a plugin structure for creating metrics packages that can
interoperate with the system, allowing it to take care of document
processing and data storage while the plugin can concentrate on the
actual generation of the metrics.
See Perl::Metrics::Plugin for more information.
"Perl::Metrics" comes with on default plugin,
Perl::Metrics::Plugin::Core, which provides a sampling of metrics.
To get started load the module, providing the database location as a
param (it will create it if needed). Then call the "process_directory"
method, providing it with an absolute path to a directory of Perl code
on the local filesystem.
"Perl::Metrics" will quitely sit there working away, and then when it
finishes you will have a nice database full of metrics data about your
Of course, how you actually USE that data is up to you, but you can
query Perl::Metrics::File and Perl::Metrics::Metric for the data just
like any other Class::DBI database once you have collected it all.
The "index_file" method takes a single absolute file path and creates an
entry in the "files" index, referencing the file name to its "hex_id"
for later use.
Note that this does not execute any metrics on the file, merely allows
the system to "remember" the file for later.
As for "index_file", the "index_directory" method will recursively scan
down a directory tree, locating all Perl files and adding them to the
Returns the number of files added.
The "process_index" method is the primary method for generating metrics
data. It triggering a metrics generation pass for all metrics on all
files currently in the index.
The "process_directory" method is a convenience method. It runs an
"index_directory" call for the directory, and then triggers a
"process_index" call after the index has been populated.
- Provide a more useful set of default plugins
- Provide the option to process for a subset of plugins
- Implemented automatic integration with PPI::Cache
Bugs should be reported via the CPAN bug tracker at
For other issues, contact the author.
Adam Kennedy <email@example.com>
Copyright 2005 - 2008 Adam Kennedy.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included
with this module.