discourse/lib/discourse_event.rb

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# frozen_string_literal: true
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# This is meant to be used by plugins to trigger and listen to events
# So we can execute code when things happen.
class DiscourseEvent
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# Defaults to a hash where default values are empty sets.
def self.events
@events ||= Hash.new { |hash, key| hash[key] = Set.new }
end
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def self.trigger(event_name, *args, **kwargs)
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events[event_name].each { |event| event.call(*args, **kwargs) }
end
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def self.on(event_name, &block)
case event_name
when :user_badge_removed
Discourse.deprecate(
"The :user_badge_removed event is deprecated. Please use :user_badge_revoked instead",
since: "3.1.0.beta5",
drop_from: "3.2.0.beta1",
output_in_test: true,
)
when :post_notification_alert
Discourse.deprecate(
"The :post_notification_alert event is deprecated. Please use :push_notification instead",
since: "3.2.0.beta1",
drop_from: "3.3.0.beta1",
output_in_test: true,
)
else
# ignore
end
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events[event_name] << block
end
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def self.off(event_name, &block)
raise ArgumentError.new "DiscourseEvent.off must reference a block" if block.nil?
events[event_name].delete(block)
end
def self.all_off(event_name)
events.delete(event_name)
end
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end