Class: BlueGreenProcess::MasterProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/blue_green_process/master_process.rb

Instance Method Summary collapse

Constructor Details

#initialize(worker_instance:, max_work:) ⇒ MasterProcess

Returns a new instance of MasterProcess.



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# File 'lib/blue_green_process/master_process.rb', line 5

def initialize(worker_instance:, max_work:)
  blue = fork_process(label: :blue, worker_instance: worker_instance)
  green = fork_process(label: :green, worker_instance: worker_instance)

  @stage_state = true
  @stage = {
    true => blue.be_active,
    false => green.be_inactive
  }
  @processes = @stage.values
  @max_work = max_work
end

Instance Method Details

#fork_process(label:, worker_instance:) ⇒ Object 



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# File 'lib/blue_green_process/master_process.rb', line 18

def fork_process(label:, worker_instance:)
  child_read, parent_write = IO.pipe
  parent_read, child_write = IO.pipe

  pid = fork do
    BlueGreenProcess.config.after_fork.call

    parent_write.close
    parent_read.close
    process_status = :inactive

    loop do
      data = child_read.gets&.strip
      case data
      when BlueGreenProcess::PROCESS_COMMAND_DIE, nil, ""
        BlueGreenProcess.debug_log "#{label}'ll die(#{$PROCESS_ID})"
        exit 0
      when BlueGreenProcess::PROCESS_COMMAND_BE_ACTIVE
        process_status = BlueGreenProcess::PROCESS_STATUS_ACTIVE
        BlueGreenProcess.debug_log "#{label}'ll be active(#{$PROCESS_ID})"
        child_write.puts BlueGreenProcess::PROCESS_RESPONSE
        ::GC.disable
      when BlueGreenProcess::PROCESS_COMMAND_BE_INACTIVE
        process_status = BlueGreenProcess::PROCESS_STATUS_INACTIVE
        BlueGreenProcess.debug_log "#{label}'ll be inactive(#{$PROCESS_ID})"
        child_write.puts BlueGreenProcess::PROCESS_RESPONSE
        ::GC.enable
        ::GC.start
      when BlueGreenProcess::PROCESS_COMMAND_WORK
        if process_status == BlueGreenProcess::PROCESS_STATUS_INACTIVE
          warn "Should not be able to run in this status"
        end
        # too verbose
        # BlueGreenProcess.debug_log "#{label}'ll work(#{$PROCESS_ID})"
        worker_instance.work(*label)
        child_write.puts BlueGreenProcess::PROCESS_RESPONSE
      else
        child_write.puts "NG"
        puts "unknown. from #{label}(#{$PROCESS_ID})"
        exit 1
      end
    end

    exit 0
  end

  child_write.close
  child_read.close

  BlueGreenProcess::WorkerProcess.new(pid, label, parent_read, parent_write)
end

#shutdown ⇒ Object 



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# File 'lib/blue_green_process/master_process.rb', line 80

def shutdown
  @processes.each do |process|
    process.wpipe.puts(BlueGreenProcess::PROCESS_COMMAND_DIE)
  end
end

#work ⇒ Object 



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# File 'lib/blue_green_process/master_process.rb', line 70

def work
  active_process do |process|
    @max_work.times do
      process.work
    end
  end

  true
end