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module EventMachine
# Creates a one-time timer
#
# timer = EventMachine::Timer.new(5) do
# # this will never fire because we cancel it
# end
# timer.cancel
#
class Timer
# Create a new timer that fires after a given number of seconds
def initialize interval, callback=nil, &block
@signature = EventMachine::add_timer(interval, callback || block)
end
# Cancel the timer
def cancel
EventMachine.send :cancel_timer, @signature
end
end
# Creates a periodic timer
#
# @example
# n = 0
# timer = EventMachine::PeriodicTimer.new(5) do
# puts "the time is #{Time.now}"
# timer.cancel if (n+=1) > 5
# end
#
class PeriodicTimer
# Create a new periodic timer that executes every interval seconds
def initialize interval, callback=nil, &block
@interval = interval
@code = callback || block
@cancelled = false
@work = method(:fire)
schedule
end
# Cancel the periodic timer
def cancel
@cancelled = true
end
# Fire the timer every interval seconds
attr_accessor :interval
# @private
def schedule
EventMachine::add_timer @interval, @work
end
# @private
def fire
unless @cancelled
@code.call
schedule
end
end
end
end
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