Class: ActiveSupport::FileUpdateChecker

Inherits:
Object
  • Object
show all
Defined in:
lib/active_support/file_update_checker.rb

Overview

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::Reloader.to_prepare do
  i18n_reloader.execute_if_updated
end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(paths, calculate = false, &block) ⇒ FileUpdateChecker

Returns a new instance of FileUpdateChecker.



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# File 'lib/active_support/file_update_checker.rb', line 18

def initialize(paths, calculate=false, &block)
  @paths = paths
  @block = block
  @last_update_at = calculate ? updated_at : nil
end

Instance Attribute Details

#last_update_at ⇒ Object (readonly)

Returns the value of attribute last_update_at.



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# File 'lib/active_support/file_update_checker.rb', line 16

def last_update_at
  @last_update_at
end

#paths ⇒ Object (readonly)

Returns the value of attribute paths.



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# File 'lib/active_support/file_update_checker.rb', line 16

def paths
  @paths
end

Instance Method Details

#execute_if_updated ⇒ Object 



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# File 'lib/active_support/file_update_checker.rb', line 28

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

#updated_at ⇒ Object 



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# File 'lib/active_support/file_update_checker.rb', line 24

def updated_at
  paths.map { |path| File.stat(path).mtime }.max
end