X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FCatalyst%2FManual%2FInternals.pod;h=6bc936054482b8cffe5da7c7c938e45bb5b78294;hb=afb208aeab7189202c63f892e2776371c7213462;hp=1553eef7795dd14429815b372ee926a021c4e247;hpb=585893b98efe1cf95118f2686108959fdebb0fab;p=catagits%2FCatalyst-Runtime.git diff --git a/lib/Catalyst/Manual/Internals.pod b/lib/Catalyst/Manual/Internals.pod index 1553eef..6bc9360 100644 --- a/lib/Catalyst/Manual/Internals.pod +++ b/lib/Catalyst/Manual/Internals.pod @@ -4,29 +4,77 @@ Catalyst::Manual::Internals - Catalyst Internals =head1 DESCRIPTION -=head2 Lifecycle +This document provides an overview of the internals of +Catalyst. As Catalyst is still developing rapidly, details +may become out of date: please treat this as a guide, and +look at the source for the last word. -These are the steps of a Catalyst request, every step can be overloaded to +The coverage is split into initialization and request lifecycle. + +=head2 Initialization + +Catalyst initializes itself in two stages (I may be wrong in some of +the details here - AF): + +=over 4 + +=item 1 + +When the Catalyst module is imported in the main application +module it evaluates any options (C<-Debug>, C<-Engine=XXX>) +and loads any specified plugins, making the application module +inherit from the plugin classes. It also sets up a default log +object and ensures that the application module inherits from +C and from the selected specialized Engine module. + +=item 2 + +When the application module makes the first call to C<< __PACKAGE__->action() >> +(implemented in C), Catalyst automatically loads all +components it finds in the C<$class::Controller>, C<$class::C>, +C<$class::Model>, C<$class::M>, C<$class::View> and C<$class::V> +namespaces (using C). A table of actions is built up +and added to on subsequent calls to C. + +=back + + +=head2 Request Lifecycle + +For each request Catalyst builds a I object, which includes +information about the request, and then searches the action table for matching +actions. + +The handling of a request can be divided into three stages: preparation of the +context, processing of the request, and finalization of the response. These +are the steps of a Catalyst request in detail; every step can be overloaded to extend Catalyst. handler prepare prepare_request - prepare_path - prepare_cookies - prepare_headers prepare_connection + prepare_headers + prepare_cookies + prepare_path prepare_action + prepare_body prepare_parameters prepare_uploads - process + dispatch finalize + finalize_cookies finalize_headers - finalize_output + finalize_body + +These steps are normally overloaded from engine classes, and may also be +extended by plugins. Extending means using multiple inheritance with L. + +The specialized engine classes populate the Catalyst request object with +information from the underlying layer (C or C) +during the prepare phase, then push the generated response information down to +the underlying layer during the finalize phase. -These steps are normally overloaded from engine classes, and extended by -plugins. -Extending means using multiple inheritance with L. =head1 AUTHOR