Class: RawLine::EventLoop

Inherits:
Object
  • Object
show all
Defined in:
lib/rawline/event_loop.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(registry:) ⇒ EventLoop

Returns a new instance of EventLoop.



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# File 'lib/rawline/event_loop.rb', line 5

def initialize(registry:)
  @registry = registry
  @events = []
  @counter = 0
end

Instance Attribute Details

#events ⇒ Object (readonly)

Returns the value of attribute events.



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# File 'lib/rawline/event_loop.rb', line 3

def events
  @events
end

Instance Method Details

#add_event(**event, &blk) ⇒ Object

event looks like:

* name
* source
* target
* payload



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# File 'lib/rawline/event_loop.rb', line 16

def add_event(**event, &blk)
  unless event.has_key?(:_event_callback)
    event[:_event_callback] = blk if blk
  end

  unless event.has_key?(:_event_id)
    @counter += 1
    event[:_event_id] = @counter
  end

  # if the last event is the same as the incoming then do there is no
  # need to add it again. For example, rendering events that already
  # back can be squashed into a single event.
  if @events.last != event
    @events << event
    event[:_event_id]
  else
    @events.last[:_event_id]
  end
end

#clear(event_id) ⇒ Object 



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# File 'lib/rawline/event_loop.rb', line 37

def clear(event_id)
  @events = @events.reject { |event| event[:_event_id] == event_id }
end

#once(interval_in_ms:, **event, &blk) ⇒ Object 



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# File 'lib/rawline/event_loop.rb', line 46

def once(interval_in_ms:, **event, &blk)
  add_event event.merge(once: { run_at: recur_at(interval_in_ms) }), &blk
end

#recur(interval_in_ms:, **event, &blk) ⇒ Object 



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# File 'lib/rawline/event_loop.rb', line 50

def recur(interval_in_ms:, **event, &blk)
  add_event event.merge(recur: { interval_in_ms: interval_in_ms, recur_at: recur_at(interval_in_ms) }), &blk
end

#reset ⇒ Object 



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# File 'lib/rawline/event_loop.rb', line 41

def reset
  @events.clear
  @counter = 0
end

#start ⇒ Object 



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# File 'lib/rawline/event_loop.rb', line 86

def start
  loop do
    tick
  end
end

#tick ⇒ Object 



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# File 'lib/rawline/event_loop.rb', line 54

def tick
  event = @events.shift
  if event
    recur = event[:recur]
    once = event[:once]
    if recur
      if current_time_in_ms >= recur[:recur_at]
        dispatch_event(event)
        interval_in_ms = recur[:interval_in_ms]
        add_event event.merge(recur: { interval_in_ms: interval_in_ms, recur_at: recur_at(interval_in_ms) } )
      else
        # put it back on the queue
        @events << event
        dispatch_event(default_event)
      end
    elsif once
      if current_time_in_ms >= once[:run_at]
        dispatch_event(event)
      else
        # put it back on the queue
        @events << event
        # add_event event
        dispatch_event(default_event)
      end
    else
      dispatch_event(event)
    end
  else
    dispatch_event(default_event)
  end
end