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tag: v3.0.4.rc1
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module ActiveSupport
# This class is responsible to track files and invoke the given block
# whenever one of these files are changed. For example, this class
# is used by Rails to reload the I18n framework whenever they are
# changed upon a new request.
#
# i18n_reloader = ActiveSupport::FileUpdateChecker.new(paths) do
# I18n.reload!
# end
#
# ActionDispatch::Callbacks.to_prepare do
# i18n_reloader.execute_if_updated
# end
#
class FileUpdateChecker
attr_reader :paths, :last_update_at
def initialize(paths, calculate=false, &block)
@paths = paths
@block = block
@last_update_at = calculate ? updated_at : nil
end
def updated_at
paths.map { |path| File.stat(path).mtime }.max
end
def execute_if_updated
current_update_at = self.updated_at
if @last_update_at != current_update_at
@last_update_at = current_update_at
@block.call
end
end
end
end
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