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 



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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