Class: Flor::Waiter

Inherits:
Object
  • Object
show all
Defined in:
lib/flor/unit/waiter.rb

Constant Summary collapse

ROW_PSEUDO_POINTS = 
%w[ status tag tasker var variable ].freeze

Instance Method Summary collapse

Constructor Details

#initialize(exid, opts) ⇒ Waiter

Returns a new instance of Waiter.



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# File 'lib/flor/unit/waiter.rb', line 7

def initialize(exid, opts)

  serie, timeout, on_timeout =
    expand_args(opts)

  # TODO fail if the serie mixes msg_waiting with row_waiting...

  @exid = exid
  @serie = serie
  @timeout = timeout
  @on_timeout = on_timeout

  @queue = []
  @mutex = Mutex.new
  @var = ConditionVariable.new

  @executor = nil
end

Instance Method Details

#check(unit, rs) ⇒ Object 



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# File 'lib/flor/unit/waiter.rb', line 68

def check(unit, rs)

  @mutex.synchronize do

    row = nil

    loop do

      break if @serie.empty?

      row = row_match?(unit, rs)
      return false unless row

      @serie.shift
    end

    @queue << [ unit, row ]
    @var.signal
  end

  true # serie over, remove me

rescue => err

#puts "!" * 80; p err
  unit.logger.warn(
    "#{self.class}#check()", err, '(returning true, aka remove me)')

  true # remove me
end

#msg_waiter? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/flor/unit/waiter.rb', line 37

def msg_waiter?

  @serie.find { |_, points|
    points.find { |po|
      ! ROW_PSEUDO_POINTS.include?(po.split(':').first) } }
end

#notify(executor, message) ⇒ Object 



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# File 'lib/flor/unit/waiter.rb', line 49

def notify(executor, message)

  @executor = executor
    # could be handy

  @mutex.synchronize do

    return false unless msg_match?(message)

    @serie.shift
    return false if @serie.any?

    @queue << [ executor, message ]
    @var.signal
  end

  true # serie over, remove me
end

#row_waiter? ⇒ Boolean

“tasker”, not “task”, since “task” is already a message point

Returns:

  • (Boolean) 


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# File 'lib/flor/unit/waiter.rb', line 29

def row_waiter?

  @serie.find { |_, points|
    points.find { |po|
      pos = po.split(':')
      pos.length > 1 && ROW_PSEUDO_POINTS.include?(pos[0]) } }
end

#to_query_hashes ⇒ Object 



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# File 'lib/flor/unit/waiter.rb', line 121

def to_query_hashes

  @serie
    .inject([ [], [] ]) { |a, (nid, points)|

      points.each do |point|

        ss = point.split(':')

        h = {}
        h[:exid] = @exid if @exid
        h[:nid] = nid if nid

        case ss[0]
        when 'status'
          h[:status] = ss[1]
          a[0] << h
        when 'tag', 'tasker', 'var', 'variable'
          t = ss[0]; t = 'var' if t == 'variable'
          h[:type] = t
          h[:name] = ss[1]
          h[:value] = ss[2] if ss[2]
          a[1] << h
        else
          fail ArgumentError, "cannot turn to query_hash, #{self.inspect}"
        end
      end

      a }
end

#to_s ⇒ Object 



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# File 'lib/flor/unit/waiter.rb', line 44

def to_s

  "#{super[0..-2]}#{{ exid: @exid, timeout: @timeout }.inspect}>"
end

#wait ⇒ Object 



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# File 'lib/flor/unit/waiter.rb', line 99

def wait

  @mutex.synchronize do

    if @queue.empty?

      @var.wait(@mutex, @timeout)
        # will wait "in aeternum" if @timeout is nil

      if @queue.empty?
        fail RuntimeError.new(
          "timeout for #{self.to_s}, " +
          "msg_waiter? #{ !! msg_waiter?}, row_waiter? #{ !! row_waiter?}"
        ) if @on_timeout == 'fail'
        return { 'exid' => @exid, 'timed_out' => @on_timeout }
      end
    end

    @queue.shift[1]
  end
end