NAME

Catalyst::Component::ContextClosure - Moose Role for components which need to close over the $ctx, without leaking

SYNOPSIS

            

              
              
package MyApp::Controller::Foo;
use Moose;
use namespace::clean -except => 'meta';
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));
}
            
          

DESCRIPTION

A common problem with stashing a closure, that closes over the Catalyst context (often called $ctx or $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 $ctx.

METHODS

make_context_closure ($closure, $ctx)

Returns a code reference, that will invoke $closure with a weakened reference to $ctx. All other parameters to the returned code reference will be passed along to $closure.

SEE ALSO

Catalyst::Component

Catalyst::Controller

CatalystX::LeakChecker

COPYRIGHT

This library is free software. You can redistribute it and/or modify it under the same terms as Perl itself.