Class: NIO::WebSocket::Reactor

Inherits:
Object
  • Object
show all
Defined in:
lib/nio/websocket/reactor.rb

Class Method Summary collapse

Class Method Details

.queue_task(&blk) ⇒ Object 



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# File 'lib/nio/websocket/reactor.rb', line 7

def queue_task(&blk)
  return unless block_given?
  task_mutex.synchronize do
    @task_queue ||= []
    @task_queue << blk
  end
  selector.wakeup
end

.reset ⇒ Object 



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# File 'lib/nio/websocket/reactor.rb', line 20

def reset
  @reactor.exit if @reactor
  @selector = nil
  @reactor = nil
  @task_queue = nil
  @task_mutex = nil
end

.selector ⇒ Object 



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# File 'lib/nio/websocket/reactor.rb', line 16

def selector
  @selector ||= NIO::Selector.new
end

.start ⇒ Object 



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# File 'lib/nio/websocket/reactor.rb', line 28

def start
  WebSocket.logger.debug "Starting reactor" unless @reactor
  @reactor ||= Thread.start do
    Thread.current.abort_on_exception = true
    WebSocket.logger.info "Reactor started"
    begin
      loop do
        queue = []
        task_mutex.synchronize do
          queue = @task_queue || []
          @task_queue = []
        end
        # If something queues up while this runs, then the selector will also be awoken & won't block
        queue.each(&:call)

        selector.select 1 do |monitor|
          begin
            monitor.value.call(monitor) if monitor.value.respond_to? :call
          rescue => e
            WebSocket.logger.error "Error occured in callback on socket #{monitor.io}.  No longer handling this connection."
            WebSocket.logger.error "#{e.class}: #{e.message}"
            e.backtrace.map { |s| WebSocket.logger.error "\t#{s}" }
            monitor.close # protect global loop from being crashed by a misbehaving driver, or a sloppy disconnect
          end
        end
        Thread.pass # give other threads a chance at manipulating our selector (e.g. a new connection on the main thread trying to register)
      end
    rescue => e
      WebSocket.logger.fatal "Error occured in reactor subsystem."
      WebSocket.logger.fatal "#{e.class}: #{e.message}"
      e.backtrace.map { |s| WebSocket.logger.fatal "\t#{s}" }
      raise
    end
  end
end