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#--
# Copyright (c) 2005-2013, John Mettraux, jmettraux@gmail.com
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# Made in Japan.
#++
module Ruote
#
# An abstract class for observing the activity of a ruote engine.
#
# Subclass it and add it as a service to observe certain events.
#
# require 'ruote/observer'
#
# class MyLaunchObserver < Ruote::Observer
#
# def on_pre_msg_launch(msg)
# puts "about to launch process instance #{msg['wfid']}"
# end
#
# def on_msg_launch(msg)
# puts "just launched process instance #{msg['wfid']}"
# end
# end
#
# # Bind the observer to the Ruote::Dashboard instance
# #
# dashboard.add_service('launch_observer', MyLaunchObserver)
#
# # ...
#
# Simply add a "on_pre_msg_<msg_name>" or "on_msg_<msg_name>" method
# for it to intercept the given messages.
#
# See Ruote::ProcessObserver for a base class with precisely defined
# methods with helpful arguments if you don't want to investigate
# "msgs" too much.
#
class Observer
def initialize(context)
@context = context
end
def on_pre_msg(msg)
route('pre', msg)
end
def on_msg(msg)
route(nil, msg)
end
protected
def route(time, msg)
target = [ 'on', time, 'msg', msg['action'] ].compact.join('_')
send(target, msg) if self.respond_to?(target)
end
end
end