Class: Bannister::Recurse

Inherits:
Object
  • Object
show all
Defined in:
lib/bannister/recurse.rb

Overview

Use the Recurse class to launch other apps with a runner script.

Instance Method Summary collapse

Constructor Details

#initialize(dir) ⇒ Recurse

Returns a new instance of Recurse.

Parameters:

  • dir (String) —

    Directory to chdir to before running bannister

Raises:

  • (ArgumentError) 


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# File 'lib/bannister/recurse.rb', line 7

def initialize(dir)
  raise ArgumentError.new("dir cannot be nil!") if dir.nil?

  @dir=dir
end

Instance Method Details

#start(foreground = false) ⇒ Object

Run the application’s runner. If foreground is true, exec “runner run” in @dir. Otherwise set up traps for the right signals to a backgrounded “runner start” process.

Parameters:

  • foreground (Boolean) (defaults to: false) —

    Pass true to run in the foreground, false otherwise.



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# File 'lib/bannister/recurse.rb', line 27

def start(foreground=false)
  Dir.chdir(@dir) do
    if foreground
      # We're replacing the current process with the child, so we want
      # std* to go to the console
      exec "./runner run"
    else
      trap("TERM"){stop()}
      trap("HUP"){stop()}

      # This ignores stdout and stderr. Since the child process expects to
      # running in the background anyway, we expect it to make its own
      # arrangements.
      #
      # Yes, this is lazy, but there's not a lot more we can do at this
      # point without a higher-level error-handling facility.
      system "./runner start &"

      sleep()
    end
  end
end

#stop ⇒ Object

Run “runner stop” and exit.



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# File 'lib/bannister/recurse.rb', line 15

def stop
  system "./runner stop"
  exit(0)
end