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Contents
require "mutex_m"
module VagrantPlugins
module CommandServe
module Util
# Helper class for tracking usage and handling
# activation and deactivation of usage based
# on count. Activation is only performed on
# the first request and deactivation is only
# performed on the final deactivation.
class UsageTracker
include Mutex_m
def initialize
super
@count = 0
end
# Activate usage. If a block is provided
# it will only be executed on initial
# activation (when count is zero).
#
# @yield Optional block to be executed
# @return [Boolean] true on initial activation
def activate
mu_synchronize do
if @count == 0 && block_given?
yield
end
@count += 1
return @count == 1
end
end
# Deactivate usage. If a block is provided
# it will only be exected on final deactivation
# (when count returns to zero). If the count
# is already zero, the block will not be
# executed.
#
# @yield Optional block to be executed
# @return [Boolean] true on final deactivation
def deactivate
mu_synchronize do
# If the count is already zero then
# we do nothing
return false if @count == 0
@count -= 1
if @count == 0 && block_given?
yield
end
return @count == 0
end
end
# @return [Boolean] usage is active
def active?
mu_synchronize { @count > 0 }
end
# @return [Boolean] usage is not active
def inactive?
!active?
end
end
end
end
end
Version data entries
4 entries across 4 versions & 2 rubygems