MainLoop

MainLoop is a simple main application implementation to control subprocesses(children) and threads.

Features:

• reaping children
• handling SIGTERM SIGINT to shutdown children(and threads) gracefully
• restarting children
• termination the children

Usage

Example usage:

require 'main_loop'

logger = Logger.new(STDOUT)
logger.level = Logger::DEBUG

bus = MainLoop::Bus.new

dispatcher = MainLoop::Dispatcher.new(bus, logger: logger)
mainloop = MainLoop::Loop.new(bus, dispatcher, logger: logger)

MainLoop::ProcessHandler.new dispatcher, 'test1', retry_count: 3, logger: logger do
  sleep 2
  exit! 0
end

MainLoop::ProcessHandler.new dispatcher, 'test2', retry_count: 2, logger: logger do
  trap 'TERM' do
    exit(0)
  end
  sleep 2
  exit! 1
end

MainLoop::ThreadHandler.new dispatcher, 'thread2', retry_count: 0, logger: logger do
  system('sleep 15;echo ok')
end

mainloop.run

Installation

It’s a gem:

  gem install main_loop

There’s also the wonders of the Gemfile:

  gem 'main_loop'