Class: GRI::Loop

Inherits:
Object show all
Defined in:
lib/gri/loop.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Loop

Returns a new instance of Loop.



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# File 'lib/gri/loop.rb', line 5

def initialize
  @collectors = {}

  @rs = []
  @ws = []
  @handlers = {}
  @times = {}
  @tos = {}
  @pt = Time.now
  @procs = []
end

Instance Attribute Details

#collectors ⇒ Object (readonly)

Returns the value of attribute collectors.



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# File 'lib/gri/loop.rb', line 3

def collectors
  @collectors
end

Instance Method Details

#attach(collector) ⇒ Object 



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# File 'lib/gri/loop.rb', line 17

def attach collector
  @collectors[collector] = true
  collector.attach self
end

#detach(collector) ⇒ Object 



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# File 'lib/gri/loop.rb', line 22

def detach collector
  collector.on_detach
  @collectors.delete collector
  del_ios = @handlers.select {|k, v| v == collector}
  del_ios.each {|io, handler|
    @handlers.delete io
    @times.delete io
    @tos.delete io
    @rs.delete io
    @ws.delete io
  }
  @on_detach.call
end

#has_active_watchers? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gri/loop.rb', line 60

def has_active_watchers?
  !(@rs.empty? and @ws.empty? and @collectors.empty? and @procs.empty?)
end

#next_tick(&cb) ⇒ Object 



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# File 'lib/gri/loop.rb', line 40

def next_tick &cb
  @procs.push cb
end

#on_detach(&on_detach) ⇒ Object 



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# File 'lib/gri/loop.rb', line 36

def on_detach &on_detach
  @on_detach = on_detach
end

#run ⇒ Object 



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# File 'lib/gri/loop.rb', line 64

def run
  while has_active_watchers?
    run_once
  end
end

#run_once ⇒ Object 



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# File 'lib/gri/loop.rb', line 70

def run_once
  while (cb = @procs.shift)
    cb.call
  end
  if (a = IO.select(@rs, @ws, nil, 1))
    rs, ws = a
    for io in rs
      @rs.delete io
      if (h = @handlers[io])
        h.on_readable io
      end
    end
    for io in ws
      @ws.delete io
      if (h = @handlers[io])
        h.on_writable io
      end
    end
  end
  if @pt.sec != (now = Time.now).sec
    for io in @rs + @ws
      if (t = @times[io]) and (to = @tos[io]) > 0 and (now - t >= to)
        @rs.delete io
        @ws.delete io
        if (h = @handlers[io])
          h.retry
        end
      end
    end
    for c in @collectors.keys
      if c.attached_at and c.attached_at + c.timeout < now
        c.on_timeout
        detach c
      end
    end
    @pt = now
  end
end

#watch(io, flag, to, handler) ⇒ Object 



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# File 'lib/gri/loop.rb', line 44

def watch io, flag, to, handler
  now = Time.now
  @handlers[io] = handler
  @times[io] = now
  @tos[io] = to
  case flag
  when :r
    @rs.push io
  when :w
    @ws.push io
  when :rw
    @rs.push io
    @ws.push io
  end
end