[Catalyst-commits] r10680 - Catalyst-Runtime/5.80/trunk/lib/Catalyst/Component

[rafl at dev.catalyst.perl.org]

Author: rafl
Date: 2009-06-26 17:34:25 +0000 (Fri, 26 Jun 2009)
New Revision: 10680

Modified:
   Catalyst-Runtime/5.80/trunk/lib/Catalyst/Component/ContextClosure.pm
Log:
Add docs for ContextClosure.

Modified: Catalyst-Runtime/5.80/trunk/lib/Catalyst/Component/ContextClosure.pm
===================================================================
--- Catalyst-Runtime/5.80/trunk/lib/Catalyst/Component/ContextClosure.pm	2009-06-26 17:11:08 UTC (rev 10679)
+++ Catalyst-Runtime/5.80/trunk/lib/Catalyst/Component/ContextClosure.pm	2009-06-26 17:34:25 UTC (rev 10680)
@@ -12,3 +12,65 @@
 }
 
 1;
+
+__END__
+
+=head1 NAME
+
+Catalyst::Component::ContextClosure - Moose Role for components which need to close over the $ctx, without leaking
+
+=head1 SYNOPSIS
+
+    package MyApp::Controller::Foo;
+    use Moose;
+    use namespace::autoclean;
+    BEGIN {
+        extends 'Catalyst::Controller';
+        with 'Catalyst::Component::ContextClosure';
+    }
+
+    sub some_action : Local {
+        my ($self, $ctx) = @_;
+        $ctx->stash(a_closure => $self->make_context_closure(sub {
+            my ($ctx) = @_;
+            $ctx->response->body('body set from closure');
+        }, $ctx);
+    }
+
+=head1 DESCRIPTION
+
+A common problem with stashing a closure, that closes over the Catalyst context
+(often called C<$ctx> or C<$c>), is the circular reference it creates, as the
+closure holds onto a reference to context, and the context holds a reference to
+the closure in its stash. This creates a memory leak, unless you always
+carefully weaken the closures context reference.
+
+This role provides a convenience method to create closures, that closes over
+C<$ctx>.
+
+=head1 METHODS
+
+=head2 make_context_closure ($closure, $ctx)
+
+Returns a code reference, that will invoke C<$closure> with a weakened
+reference to C<$ctx>. All other parameters to the returned code reference will
+be passed along to C<$closure>.
+
+=head1 SEE ALSO
+
+L<Catalyst::Component>
+
+L<Catalyst::Controller>
+
+L<CatalystX::LeakChecker>
+
+=head1 AUTHOR
+
+Florian Ragwitz E<lt>rafl at debian.orgE<gt>
+
+=head1 COPYRIGHT
+
+This library is free software. You can redistribute it and/or modify it under
+the same terms as Perl itself.
+
+=cut