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#!/usr/bin/env ruby
# subscriptions are permanent associations determining how different
# objects react to an event
require 'puppet/util/pson'
# This is Puppet's class for modeling edges in its configuration graph.
# It used to be a subclass of GRATR::Edge, but that class has weird hash
# overrides that dramatically slow down the graphing.
class Puppet::Relationship
extend Puppet::Util::Pson
attr_accessor :source, :target, :callback
attr_reader :event
def self.from_pson(pson)
source = pson["source"]
target = pson["target"]
args = {}
if event = pson["event"]
args[:event] = event
end
if callback = pson["callback"]
args[:callback] = callback
end
new(source, target, args)
end
def event=(event)
raise ArgumentError, "You must pass a callback for non-NONE events" if event != :NONE and ! callback
@event = event
end
def initialize(source, target, options = {})
@source, @target = source, target
options = (options || {}).inject({}) { |h,a| h[a[0].to_sym] = a[1]; h }
[:callback, :event].each do |option|
if value = options[option]
send(option.to_s + "=", value)
end
end
end
# Does the passed event match our event? This is where the meaning
# of :NONE comes from.
def match?(event)
if self.event.nil? or event == :NONE or self.event == :NONE
return false
elsif self.event == :ALL_EVENTS or event == self.event
return true
else
return false
end
end
def label
result = {}
result[:callback] = callback if callback
result[:event] = event if event
result
end
def ref
"#{source} => #{target}"
end
def inspect
"{ #{source} => #{target} }"
end
def to_pson_data_hash
data = {
'source' => source.to_s,
'target' => target.to_s
}
["event", "callback"].each do |attr|
next unless value = send(attr)
data[attr] = value
end
data
end
def to_pson(*args)
to_pson_data_hash.to_pson(*args)
end
def to_s
ref
end
end
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