Class: Buffet::Master

Inherits:
Object
  • Object
show all
Defined in:
lib/buffet/master.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(project, slaves, specs, listener) ⇒ Master

Returns a new instance of Master.



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# File 'lib/buffet/master.rb', line 10

def initialize project, slaves, specs, listener
  @project = project
  @slaves = slaves
  @stats = { :examples => 0, :failures => 0, :pending => 0, :spurious_failures => 0 }
  @slaves_stats = Hash[@slaves.map do |slave|
    [slave.user_at_host, stats.dup.merge!(:slave => slave, :specs => [])]
  end]
  @slave_exceptions = {}
  @max_slave_prepare_failures = [Settings.allowed_slave_prepare_failures,
                                 @slaves.count - 1].min
  @stats[:slaves] = @slaves_stats
  @lock = Mutex.new
  @condition = ConditionVariable.new
  @failures = []
  @spurious_failures = []
  @specs = order_specs(specs)
  @listener = listener
  @halt_exception = nil

  # How many times a particular spec file was queued
  @spec_queue_count = Hash.new { |h, k| h[k] = 0 }

  # Need this so when we get back an example result from a slave we can know
  # which spec it is from. This prevents the wrong file from being reported
  # in the case of shared examples.
  @current_spec_for_slave = {}

  # Store spec results on per spec per line basis
  @spec_results = Hash.new { |h, k| h[k] = [] }
end

Instance Attribute Details

#failures ⇒ Object (readonly)

Returns the value of attribute failures.



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# File 'lib/buffet/master.rb', line 8

def failures
  @failures
end

#slave_exceptions ⇒ Object (readonly)

Returns the value of attribute slave_exceptions.



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# File 'lib/buffet/master.rb', line 8

def slave_exceptions
  @slave_exceptions
end

#spurious_failures ⇒ Object (readonly)

Returns the value of attribute spurious_failures.



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# File 'lib/buffet/master.rb', line 8

def spurious_failures
  @spurious_failures
end

#stats ⇒ Object (readonly)

Returns the value of attribute stats.



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# File 'lib/buffet/master.rb', line 8

def stats
  @stats
end

Instance Method Details

#example_failed(slave_name, details) ⇒ Object 



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# File 'lib/buffet/master.rb', line 155

def example_failed(slave_name, details)
  @lock.synchronize do
    @spec_results[@current_spec_for_slave[slave_name]] << details
  end

  @listener.example_failed
end

#example_passed(slave_name, details) ⇒ Object 



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# File 'lib/buffet/master.rb', line 147

def example_passed(slave_name, details)
  @lock.synchronize do
    @spec_results[@current_spec_for_slave[slave_name]] << details
  end

  @listener.example_passed
end

#example_pending(slave_name, details) ⇒ Object 



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# File 'lib/buffet/master.rb', line 163

def example_pending slave_name, details
 @lock.synchronize do
   @stats[:examples] += 1
   @stats[:pending] += 1
   @slaves_stats[slave_name][:pending] += 1
 end

 @listener.example_pending
end

#next_file_for(slave_name, previous_spec) ⇒ Object 



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# File 'lib/buffet/master.rb', line 109

def next_file_for(slave_name, previous_spec)
  file = nil

  @lock.synchronize do
    if rerun_spec?(previous_spec)
      @spec_queue_count[previous_spec] += 1
      return previous_spec
    else
      if file = @specs.shift
        @spec_queue_count[file] += 1
        @current_spec_for_slave[slave_name] = file

        @slaves_stats[slave_name][:specs] << file
      end
    end
  end

  if file
    slave = nil
    @lock.synchronize do
      slave = @slaves_stats[slave_name][:slave]
    end
    @listener.spec_taken(slave, file)
  end

  file
end

#order_specs(specs) ⇒ Object 



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# File 'lib/buffet/master.rb', line 41

def order_specs(specs)
  specs.map do |spec|
    [`wc -l #{spec}`.to_i, spec]
  end.sort.reverse.map(&:last)
end

#run ⇒ Object 



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# File 'lib/buffet/master.rb', line 47

def run
  start_service

  @stats[:total_time] = Benchmark.measure do
    @threads = @slaves.map do |slave|
      Thread.new do
        run_worker slave
      end
    end

    wait_for_workers
  end.real

  stop_service

  process_spec_results
end

#run_worker(slave) ⇒ Object 



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# File 'lib/buffet/master.rb', line 65

def run_worker slave
  time = Benchmark.measure do
    begin
      prepare_slave slave
    rescue CommandError => ex
      slave_prepare_failed slave, ex
    rescue Exception => ex
      stop_run ex
    else
      begin
        run_slave slave
      rescue Exception => ex
        stop_run ex
      end
    end
  end.real

  @lock.synchronize do
    @slaves_stats[slave.name][:total_time] = time
    @condition.signal # Tell master this slave is finished
  end
end

#slave_prepare_failed(slave, ex) ⇒ Object 



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# File 'lib/buffet/master.rb', line 137

def slave_prepare_failed slave, ex
  @listener.slave_prepare_failed slave, ex

  @lock.synchronize do
    slave_exceptions[slave.name] = ex

    @condition.signal # Alert master this slave failed
  end
end

#stop_run(ex) ⇒ Object 



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# File 'lib/buffet/master.rb', line 102

def stop_run ex
  @lock.synchronize do
    @halt_exception = ex
    @condition.signal # Alert master
  end
end

#wait_for_workers ⇒ Object 



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# File 'lib/buffet/master.rb', line 88

def wait_for_workers
  @threads.count.times do
    @lock.synchronize do
      @condition.wait(@lock)

      raise @halt_exception if @halt_exception

      if slave_exceptions.count > @max_slave_prepare_failures
        raise 'Exceeded maximum number of allowed slave prepare failures'
      end
    end
  end
end