Catalyst::Plugin::Hooks - Add hooks to Catalyst engine actions

In MyApp.pm:

  use Catalyst qw(
    -Debug
    Hooks
  );

In Some model:

  sub new {
    my $self = shift;
    my ( $c ) = @_;

    $self = $self->NEXT::new( @_ );

    open my $filehandle, "> foo.log";

    $c->add_after_finalize_hook( sub {
        my $c = shift;
        $filehandle->flush();
        $c->log->info( "Flushed filehandle after finalize" );
    } );

    return $self;
  }

Don't use this plugin!

Use Catalyst::Plugin::Observe. All functionality provided in C:P:Hooks will very shortly be available in C:P:Observe. C:P:Hooks is probably not going to work in the next Catalyst release, so rewrite your code to use C:P:Observe.

This Plugin is usefull for when you want to run some code before or after a catalyst engine action. Consider writing a Catalyst plugin if you implement more general functionality. But let's say you want to flush your log's filehandle after the request is done (then the requestor doesn't have to wait for your log's to be flushed). It would be nice to put the code for flushing the filehandle next to the rest of the code that's bothered with the filehandle, so you don't have to pass the filehandle around. Example for this is shown in the SYNOPSIS.

Hooks are addable everywhere a $c exists, even in Controllers. But remember, adding a hook every request will cause a memory overflow. So don't put these methods in Controller actions.

All of these methods are currently hookable:

    handle_request
    prepare
    prepare_request
    prepare_connection
    prepare_query_parameters
    prepare_headers
    prepare_cookies
    prepare_path
    prepare_body
    prepare_body_parameters
    prepare_parameters
    prepare_uploads
    prepare_action
    dispatch
    finalize
    finalize_uploads
    finalize_error
    finalize_headers
    finalize_cookies
    finalize_body

To add a before hook: $c->add_ <method name> _hook( sub { some code } );

To add an after hook: $c->add_after_ <method name> _hook( sub { some code } );

$c->add_before_ <method name> _hook is an alias to $c->add_ <method name> _hook.

To remove all hooks for an action: $c->remove_all_ <method name> _hooks;

To remove all hooks set by this module: $c->remove_all_hooks;

Catalyst, Catalyst::Manual::Internals for when the different actions are called.

Berik Visschers <berikv@xs4all.nl>