文件操作 - periodic_watcher.rb
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文件: /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util/watcher/periodic_watcher.rb
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# frozen_string_literal: true # Monitor a given watcher for changes on a periodic interval. class Puppet::Util::Watcher::PeriodicWatcher # @param watcher [Puppet::Util::Watcher::ChangeWatcher] a watcher for the value to watch # @param timer [Puppet::Util::Watcher::Timer] A timer to determine when to # recheck the watcher. If the timeout of the timer is negative, then the # watched value is always considered to be changed def initialize(watcher, timer) @watcher = watcher @timer = timer @timer.start end # @return [true, false] If the file has changed since it was last checked. def changed? return true if always_consider_changed? @watcher = examine_watched_info(@watcher) @watcher.changed? end private def always_consider_changed? @timer.timeout < 0 end def examine_watched_info(known) if @timer.expired? @timer.start known.next_reading else known end end end
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