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75 lines
2.8 KiB
75 lines
2.8 KiB
#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2013 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See doc/COPYRIGHT.rdoc for more details.
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#++
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module OpenProject
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class Notifications
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# Subscribe to a specific event with name
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# Contrary to ActiveSupport::Notifications, we don't support regexps here, but only
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# single events specified as string.
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#
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# @param name [String] The name of the event to subscribe to.
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# @param clear_subscriptions [Boolean] Clears all previous subscriptions to this
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# event if true. Use with care!
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# @return nil
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# @raises ArgumentError if no block is given.
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def self.subscribe(name, clear_subscriptions: false, &block)
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# if no block is given, raise an error
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raise ArgumentError, 'please provide a block as a callback' unless block_given?
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if clear_subscriptions
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subscriptions[name].each do |sub|
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ActiveSupport::Notifications.unsubscribe sub
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end
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end
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sub = ActiveSupport::Notifications.subscribe(name.to_s) do |_, _, _, _, payload|
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block.call(payload)
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end
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subs = clear_subscriptions ? [] : Array(subscriptions[name])
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subscriptions[name] = subs + [sub]
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# Don't return a subscription object as it's an implementation detail.
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nil
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end
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# Send a notification
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# payload should be a Hash and might be marshalled and unmarshalled before being
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# delivered (although it is not at the moment), so don't count on object equality
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# for the payload.
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def self.send(name, payload)
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ActiveSupport::Notifications.instrument(name, payload)
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end
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def self.subscriptions
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@subscriptions ||= {}
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end
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private_class_method :subscriptions
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end
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end
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