Class: Timers::Events

Inherits:
Object
  • Object
show all
Defined in:
lib/timers/events.rb

Overview

Maintains a PriorityHeap of events ordered on time, which can be cancelled.

Defined Under Namespace

Classes: Handle

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Events

Returns a new instance of Events.



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# File 'lib/timers/events.rb', line 51

def initialize
	# A sequence of handles, maintained in sorted order, future to present.
	# @sequence.last is the next event to be fired.
	@sequence = PriorityHeap.new
	@queue = []
end

Instance Method Details

#fire(time) ⇒ Object

Fire all handles for which Handle#time is less than the given time.



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# File 'lib/timers/events.rb', line 85

def fire(time)
	merge!
	
	while handle = @sequence.peek and handle.time <= time
		@sequence.pop
		handle.fire(time)
	end
end

#first ⇒ Object

Returns the first non-cancelled handle.



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# File 'lib/timers/events.rb', line 70

def first
	merge!
	
	while (handle = @sequence.peek)
		return handle unless handle.cancelled?
		@sequence.pop
	end
end

#schedule(time, callback) ⇒ Object

Add an event at the given time.



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# File 'lib/timers/events.rb', line 59

def schedule(time, callback)
	flush!
	
	handle = Handle.new(time.to_f, callback)
	
	@queue << handle
	
	return handle
end

#size ⇒ Object

Returns the number of pending (possibly cancelled) events.



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# File 'lib/timers/events.rb', line 80

def size
	@sequence.size + @queue.size
end