Class: Jefe::EM

Inherits:
Object
  • Object
show all
Includes:
Emitter
Defined in:
lib/jefe/em.rb

Defined Under Namespace

Classes: ProcessHandler

Instance Method Summary collapse

Methods included from Emitter

#callbacks, #emit, included, #on

Constructor Details

#initialize(printer) ⇒ EM

Returns a new instance of EM.



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# File 'lib/jefe/em.rb', line 9

def initialize(printer)
	@printer = printer
	@fsm = MicroMachine.new(:started).tap do |m|
		m.when(:stop, :started => :stopped)
	end
end

Instance Method Details

#add(name, command) ⇒ Object 



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# File 'lib/jefe/em.rb', line 31

def add name, command
	@printer.out name, "starting #{command}"

	PTY.spawn(command) do |output, input, pid|
		input.close
		
		@printer.out(name, "started with pid #{pid}")

		c = EM.attach output, ProcessHandler
		m = MicroMachine.new(:started).tap do |m|
			m.when(:stop, :started => :stopped)
		end

		c.on(:data) do |data|
			@printer.out(name, data)
		end

		c.on(:unbind) do
			@printer.out(name, "process terminated")
			m.trigger(:stop)
			self.stop
		end
		
		self.on(:stop) do
			if m.trigger(:stop)
				@printer.out("system", "killing #{name} in #{pid}")
				Process.kill("INT", pid)
			end
		end
	end
end

#start ⇒ Object 



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# File 'lib/jefe/em.rb', line 16

def start
	@printer.out "system", "starting"
	EM.run do
		yield self
	end
end

#stop ⇒ Object 



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# File 'lib/jefe/em.rb', line 23

def stop
	if @fsm.trigger(:stop)
		@printer.out "system", "stopping"
		emit(:stop)
		EM.stop
	end
end