lib/god/event_handler.rb

   1 module God
   2   class EventHandler
   3     @@actions = {}
   4     @@handler = nil
   5
   6     def self.handler=(value)
   7       @@handler = value
   8     end
   9
  10     def self.register(pid, event, &block)
  11       @@actions[pid] ||= {}
  12       @@actions[pid][event] = block
  13       @@handler.register_process(pid, @@actions[pid].keys)
  14     end
  15
  16     def self.deregister(pid, event=nil)
  17       if watching_pid? pid
  18         if event.nil?
  19           @@actions.delete(pid)
  20           @@handler.register_process(pid, []) if system("kill -0 #{pid} &> /dev/null")
  21         else
  22           @@actions[pid].delete(event)
  23           @@handler.register_process(pid, @@actions[pid].keys) if system("kill -0 #{pid} &> /dev/null")
  24         end
  25       end
  26     end
  27
  28     def self.call(pid, event)
  29       @@actions[pid][event].call
  30     end
  31
  32     def self.watching_pid?(pid)
  33       @@actions[pid]
  34     end
  35
  36     def self.start
  37       Thread.new do
  38         loop do
  39           @@handler.handle_events
  40         end
  41       end
  42     end
  43
  44   end
  45 end