Class: ParallelRSpec::Workers

Inherits:
Object
  • Object
show all
Defined in:
lib/parallel_rspec/workers.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(number_of_workers = Workers.number_of_workers) ⇒ Workers

Returns a new instance of Workers.



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# File 'lib/parallel_rspec/workers.rb', line 11

def initialize(number_of_workers = Workers.number_of_workers)
  @number_of_workers = number_of_workers
end

Instance Attribute Details

#number_of_workers ⇒ Object (readonly)

Returns the value of attribute number_of_workers.



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# File 'lib/parallel_rspec/workers.rb', line 9

def number_of_workers
  @number_of_workers
end

Class Method Details

.number_of_workers ⇒ Object 



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# File 'lib/parallel_rspec/workers.rb', line 3

def self.number_of_workers
  workers = ENV['WORKERS'].to_i
  workers = 4 if workers.zero?
  workers
end

Instance Method Details

#establish_test_database_connection(worker) ⇒ Object 



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# File 'lib/parallel_rspec/workers.rb', line 57

def establish_test_database_connection(worker)
  ENV['TEST_ENV_NUMBER'] = worker.to_s
  ActiveRecord::Base.configurations['test']['database'] << worker.to_s unless worker == 1
  ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations['test'])
end

#invoke_server_for_channels(server, channels) ⇒ Object 



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# File 'lib/parallel_rspec/workers.rb', line 45

def invoke_server_for_channels(server, channels)
  while !channels.empty?
    Channel.read_select(channels).each do |channel|
      if command = channel.read
        server.send(*command)
      else
        channels.delete(channel)
      end
    end
  end
end

#run_test_workers ⇒ Object 



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# File 'lib/parallel_rspec/workers.rb', line 15

def run_test_workers
  child_pids = (1..number_of_workers).collect do |worker|
    fork do
      establish_test_database_connection(worker)
      yield worker
    end
  end

  verify_children(child_pids)
end

#run_test_workers_with_server(server) ⇒ Object 



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# File 'lib/parallel_rspec/workers.rb', line 26

def run_test_workers_with_server(server)
  child_pids, channels = (1..number_of_workers).collect do |worker|
    channel_to_client, channel_to_server = ParallelRSpec::Channel.pipe

    pid = fork do
      channel_to_client.close
      establish_test_database_connection(worker)
      yield worker, channel_to_server
    end

    channel_to_server.close
    [pid, channel_to_client]
  end.transpose

  invoke_server_for_channels(server, channels)

  verify_children(child_pids)
end

#verify_children(child_pids) ⇒ Object 



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# File 'lib/parallel_rspec/workers.rb', line 63

def verify_children(child_pids)
  results = child_pids.collect { |pid| Process.wait2(pid).last }.reject(&:success?)

  unless results.empty?
    STDERR.puts "\n#{results.size} worker#{'s' unless results.size == 1} failed"
    exit 1
  end
end