Class: DeepTest::CentralCommand

Inherits:
Object
  • Object
show all
Defined in:
lib/deep_test/central_command.rb

Defined Under Namespace

Modules: Operation, Result Classes: CheckIfAgentsAreStillRunning, NoAgentsRunningError, NoWorkUnitsAvailableError, NoWorkUnitsRemainingError, UnexpectedMessageError

Constant Summary collapse

NeedWork = 
"NeedWork"
NoMoreWork = 
"NoMoreWork"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ CentralCommand

Returns a new instance of CentralCommand.



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# File 'lib/deep_test/central_command.rb', line 9

def initialize(options)
  @options = options
  @work_queue = Queue.new
  @results_mutex = Mutex.new
  @results_condvar = ConditionVariable.new
  @results = []
  @data = Metrics::Data.new
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/deep_test/central_command.rb', line 7

def data
  @data
end

#operator ⇒ Object (readonly)

Returns the value of attribute operator.



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# File 'lib/deep_test/central_command.rb', line 5

def operator
  @operator
end

#switchboard ⇒ Object (readonly)

Returns the value of attribute switchboard.



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# File 'lib/deep_test/central_command.rb', line 6

def switchboard
  @switchboard
end

Class Method Details

.start(options) ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 65

def self.start(options)
  central_command = new(options)
  central_command.start
  central_command
end

Instance Method Details

#done_with_work ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 18

def done_with_work
  @done_with_work = true
end

#process_messages ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 87

def process_messages
  loop do
    begin
      return if @stop_process_messages
      wires_waiting_for_work.each { |w| send_work w }

      @results_mutex.synchronize do
        # make take_result wake up and check if any agents are running
        @results_condvar.signal
      end

      message, wire = switchboard.next_message(:timeout => 0.5)

      case message.body
      when NeedWork
        send_work wire
      when Result 
        write_result message.body
        send_work wire
      when Operation
        message.body.execute
      when Metrics::Measurement
        data.add message.body
      else 
        raise UnexpectedMessageError, message.inspect
      end

    rescue Telegraph::NoMessageAvailable
      retry
    rescue Exception => e
      raise unless @stop_process_messages
    end
  end
end

#put_abandonded_work_back_on_the_queue ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 142

def put_abandonded_work_back_on_the_queue
  closed_wires = switchboard.using_wires { |wires| wires.select {|w| w.closed? }}
  closed_wires.each do |wire|
    wire.unacked_messages.each do |m|
      write_work m.body
      switchboard.drop_wire wire
    end
  end
end

#send_work(wire) ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 126

def send_work(wire)
  begin
    wire.send_message take_work, :need_ack => true
    wires_waiting_for_work.delete wire

  rescue NoWorkUnitsAvailableError
    put_abandonded_work_back_on_the_queue
    wires_waiting_for_work.add wire

  rescue NoWorkUnitsRemainingError
    wire.send_message NoMoreWork
    wires_waiting_for_work.delete wire

  end
end

#start ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 71

def start
  @switchboard = Telegraph::Switchboard.new
  @operator = Telegraph::Operator.listen("0.0.0.0", 0, @switchboard)
  @options.server_port = @operator.port
  @process_messages_thread = Thread.new { process_messages }

  DeepTest.logger.info { "Started DeepTest service on port #{@operator.port}" }
end

#stderr ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 61

def stderr
  $stderr
end

#stdout ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 57

def stdout
  $stdout
end

#stop ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 152

def stop
  @stop_process_messages = true
  operator.shutdown
  @process_messages_thread.join
  data.save @options.metrics_file if @options.gathering_metrics?
end

#take_result ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 22

def take_result
  @results_mutex.synchronize do
    loop do
      if @results.any?
        return @results.shift
      else
        @results_condvar.wait @results_mutex
        raise NoAgentsRunningError unless @results.any? || @switchboard.any_live_wires?
      end
    end
  end
end

#take_work ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 35

def take_work
  @work_queue.pop(true)
rescue ThreadError => e
  if e.message == "queue empty"
    raise NoWorkUnitsRemainingError if @done_with_work
    raise NoWorkUnitsAvailableError
  else
    raise
  end
end

#wires_waiting_for_work ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 122

def wires_waiting_for_work
  @wires_waiting_for_work ||= Set.new
end

#write_result(result) ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 46

def write_result(result)
  @results_mutex.synchronize do
    @results << result
    @results_condvar.signal
  end
end

#write_work(work_unit) ⇒ Object 



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# File 'lib/deep_test/central_command.rb', line 53

def write_work(work_unit)
  @work_queue.push work_unit
end