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

#initializeEvents

Returns a new instance of Events.


63
64
65
66
67
68
# File 'lib/timers/events.rb', line 63

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.


95
96
97
98
99
100
101
102
# File 'lib/timers/events.rb', line 95

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

#firstObject

Returns the first non-cancelled handle.


80
81
82
83
84
85
86
87
# File 'lib/timers/events.rb', line 80

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.


71
72
73
74
75
76
77
# File 'lib/timers/events.rb', line 71

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

#sizeObject

Returns the number of pending (possibly cancelled) events.


90
91
92
# File 'lib/timers/events.rb', line 90

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