class Transaction::EventManager

# File lib/puppet/transaction/event_manager.rb, line 6
def initialize(transaction)
  @transaction = transaction
  @event_queues = {}
  @events = []
end

# File lib/puppet/transaction/event_manager.rb, line 17
def process_events(resource)
  restarted = false
  queued_events(resource) do |callback, events|
    r = process_callback(resource, callback, events)
    restarted ||= r
  end

  if restarted
    queue_events(resource, [resource.event(:name => :restarted, :status => "success")])

    transaction.resource_status(resource).restarted = true
  end
end

# File lib/puppet/transaction/event_manager.rb, line 33
def queue_events(resource, events)
  #@events += events

  # Do some basic normalization so we're not doing so many
  # graph queries for large sets of events.
  events.inject({}) do |collection, event|
    collection[event.name] ||= []
    collection[event.name] << event
    collection
  end.collect do |name, list|
    # It doesn't matter which event we use - they all have the same source
    # and name here.
    event = list[0]

    # Collect the targets of any subscriptions to those events.  We pass
    # the parent resource in so it will override the source in the events,
    # since eval_generated children can't have direct relationships.
    received = (event.name != :restarted)
    relationship_graph.matching_edges(event, resource).each do |edge|
      received ||= true unless edge.target.is_a?(Puppet::Type.type(:whit))
      next unless method = edge.callback
      next unless edge.target.respond_to?(method)

      queue_events_for_resource(resource, edge.target, method, list)
    end
    @events << event if received

    queue_events_for_resource(resource, resource, :refresh, [event]) if resource.self_refresh? and ! resource.deleting?
  end
end

# File lib/puppet/transaction/event_manager.rb, line 64
def queue_events_for_resource(source, target, callback, events)
  whit = Puppet::Type.type(:whit)

  # The message that a resource is refreshing the completed-whit for its own class
  # is extremely counter-intuitive. Basically everything else is easy to understand,
  # if you suppress the whit-lookingness of the whit resources
  refreshing_c_whit = target.is_a?(whit) && target.name =~ /^completed_/

  if refreshing_c_whit
    source.debug "The container #{target} will propagate my #{callback} event"
  else
    source.info "Scheduling #{callback} of #{target}"
  end

  @event_queues[target] ||= {}
  @event_queues[target][callback] ||= []
  @event_queues[target][callback].concat(events)
end

# File lib/puppet/transaction/event_manager.rb, line 83
def queued_events(resource)
  return unless callbacks = @event_queues[resource]
  callbacks.each do |callback, events|
    yield callback, events
  end
end

# File lib/puppet/transaction/event_manager.rb, line 12
def relationship_graph
  transaction.relationship_graph
end