NAME

Test::Builder2::EventWatcher - A role which watches events and results

SYNOPSIS

package My::EventWatcher;

use Test::Builder2::Mouse;
with "Test::Builder2::EventWatcher";

sub accept_event  { ... }

no Test::Builder2::Mouse;

DESCRIPTION

An EventWatcher is made known to an EventCoordinator which gives it Events and Results to do whatever it wants with. EventWatchers can be used to record events for future use (such as Test::Builder2::History), to take an action like producing output (such as Test::Builder2::Formatter) or even modifying the event itself.

METHODS

Required Methods

When writing an EventWatcher you must supply these methods.

accept_event

$event_watcher->accept_event($event);
$event_watcher->accept_event($event, $event_coordinator);

An EventWatcher will be handed Event objects to do whatever it wants to with via this method.

accept_event is allowed to alter the $event. Be aware those changes will be visible to other EventWatchers.

It may also be given the $event_coordinator which is managing the $event. This allows a watcher to issue their own Events.

You must implement this method.

Supplied Methods

The EventWatcher role supplies these methods.

accept_result

$event_watcher->accept_result($result);
$event_watcher->accept_result($result, $event_coordinator);

Just like accept_event except it handles Results (which are a special type of Event). It is there to make special case handling of Results a little more convenient.

The provided accept_result simply passes through to accept_event.