OpenProject is the leading open source project management software.
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openproject/lib/open_project/notifications.rb

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#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2020 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2017 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# See docs/COPYRIGHT.rdoc for more details.
#++
module OpenProject
##
# Notifications about Events in OpenProject (e.g. created work packages)
#
# @see OpenProject::Events
module Notifications
module_function
# Subscribe to a specific event with name
# Contrary to ActiveSupport::Notifications, we don't support regexps here, but only
# single events specified as string.
#
# @param name [String] The name of the event to subscribe to.
# @param clear_subscriptions [Boolean] Clears all previous subscriptions to this
# event if true. Use with care!
# @return [Int] Subscription ID
# @raises ArgumentError if no block is given.
def subscribe(name, clear_subscriptions: false, &block)
# if no block is given, raise an error
raise ArgumentError, 'please provide a block as a callback' unless block_given?
if clear_subscriptions
subscriptions[name].each do |sub|
ActiveSupport::Notifications.unsubscribe sub
end
end
sub = ActiveSupport::Notifications.subscribe(name.to_s) do |_, _, _, _, payload|
block.call(payload)
end
subs = clear_subscriptions ? [] : Array(subscriptions[name])
subscriptions[name] = subs + [sub]
subscriptions[name].size - 1
end
def unsubscribe(name, id)
sub = subscriptions[name].delete_at id
if sub
ActiveSupport::Notifications.unsubscribe sub
true
end
end
# Send a notification
# payload should be a Hash and might be marshalled and unmarshalled before being
# delivered (although it is not at the moment), so don't count on object equality
# for the payload.
def send(name, payload)
ActiveSupport::Notifications.instrument(name.to_s, payload)
end
def subscriptions
@subscriptions ||= {}
end
end
end