文件操作 - change_watcher.rb
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文件: /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util/watcher/change_watcher.rb
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# frozen_string_literal: true # Watches for changes over time. It only re-examines the values when it is requested to update readings. # @api private class Puppet::Util::Watcher::ChangeWatcher def self.watch(reader) Puppet::Util::Watcher::ChangeWatcher.new(nil, nil, reader).next_reading end def initialize(previous, current, value_reader) @previous = previous @current = current @value_reader = value_reader end def changed? if uncertain? false else @previous != @current end end def uncertain? @previous.nil? || @current.nil? end def change_current_reading_to(new_value) Puppet::Util::Watcher::ChangeWatcher.new(@current, new_value, @value_reader) end def next_reading change_current_reading_to(@value_reader.call) end end
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