Catalyst::Component::CUserxContributed PCatalyst::Component::ContextClosure(3)NAMECatalyst::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.
perl v5.14.22012-0Catalyst::Component::ContextClosure(3)
