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require 'atomic'
module Metriks
# Public: Counters are one of the simplest metrics whose only operations
# are increment and decrement.
class Counter
# Public: Initialize a new Counter.
def initialize
@count = Atomic.new(0)
end
# Public: Reset the counter back to 0
#
# Returns nothing.
def clear
@count.value = 0
end
# Public: Increment the counter.
#
# incr - The value to add to the counter.
#
# Returns nothing.
def increment(incr = 1)
@count.update { |v| v + incr }
end
# Public: Decrement the counter.
#
# decr - The value to subtract from the counter.
#
# Returns nothing.
def decrement(decr = 1)
@count.update { |v| v - decr }
end
# Public: The current count.
#
# Returns the count.
def count
@count.value
end
end
end
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