class ActiveSupport::EventedFileUpdateChecker

def execute
  @core.updated.make_false
  @block.call
end

def execute_if_updated
  if updated?
    yield if block_given?
    execute
    true
  end
end

:nodoc: all

# => "changed"
checker.execute_if_updated
# => true
checker.updated?

FileUtils.touch("/tmp/foo")

# => nil
checker.execute_if_updated
# => false
checker.updated?
checker = ActiveSupport::EventedFileUpdateChecker.new(["/tmp/foo"]) { puts "changed" }

Example:

is run and there have been changes to the file system.
EventedFileUpdateChecker#execute is run or when EventedFileUpdateChecker#execute_if_updated
and file extensions to watch. It also takes a block that is called when
The file checker takes an array of files to watch or a hash specifying directories

in state.
Instead, it uses platform-specific file system events to trigger a change
The evented file updater does not hit disk when checking for updates.
Allows you to "listen" to changes in a file system.

def initialize(files, dirs = {}, &block)
  unless block
    raise ArgumentError, "A block is required to initialize an EventedFileUpdateChecker"
  end
  @block = block
  @core = Core.new(files, dirs)
  ObjectSpace.define_finalizer(self, @core.finalizer)
end

def inspect
  "#<ActiveSupport::EventedFileUpdateChecker:#{object_id} @files=#{@core.files.to_a.inspect}"
end

def updated?
  if @core.restart?
    @core.thread_safely(&:restart)
    @core.updated.make_true
  end
  @core.updated.true?
end