Class: Flapjack::Coordinator

Inherits:
Object
  • Object
show all
Defined in:
lib/flapjack/coordinator.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Coordinator

states: :starting, :running, :reloading, :stopped



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# File 'lib/flapjack/coordinator.rb', line 23

def initialize(config)
  Thread.abort_on_exception = true

  ActiveSupport.use_standard_json_time_format = true
  ActiveSupport.time_precision = 0

  @exit_value = nil

  @config   = config
  @pikelets = []

  @received_signals = []

  @state = :starting
  @monitor = Monitor.new
  @monitor_cond = @monitor.new_cond

  # needs to be done per-thread
  cfg = @config.all
  Flapjack.configure_log('flapjack-coordinator', cfg.nil? ? {} : cfg['logger'])

  @reload = proc {
    @monitor.synchronize {
      @monitor_cond.wait_until { :running.eql?(@state) }
      @state = :reloading
      @monitor_cond.signal
    }
  }

  @shutdown = proc { |exit_val|
    @monitor.synchronize {
      @monitor_cond.wait_until { :running.eql?(@state) }
      @state = :stopping
      @exit_value = exit_val
      @monitor_cond.signal
    }
  }
end

Instance Method Details

#start(opts = {}) ⇒ Object 



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# File 'lib/flapjack/coordinator.rb', line 62

def start(opts = {})
  # we can't block on the main thread, as signals interrupt that
  Thread.new do
    # needs to be done per-thread
    cfg = @config.all
    Flapjack.configure_log('flapjack-coordinator', cfg.nil? ? {} : cfg['logger'])

    @boot_time = Time.now

    Flapjack::RedisProxy.config = @config.for_redis

    pikelet_defs = pikelet_definitions(cfg)
    return if pikelet_defs.empty?

    create_pikelets(pikelet_defs).each do |pik|
      @pikelets << pik
    end

    @pikelets.each do |pik|
      pik.start
    end

    setup_signals if opts[:signals]

    # block this thread until 'stop' has been called, and
    # all pikelets have been stopped
    @monitor.synchronize {
      @state = :running
      @monitor_cond.wait_until { !(:running.eql?(@state)) }
      case @state
      when :reloading
        reload
        @state = :running
        @monitor_cond.signal
      when :stopping
        @pikelets.map(&:stop)
        @pikelets.clear
        @state = :stopped
        @monitor_cond.signal
      end
    }

  end.join

  @exit_value
end