class Fluent::Compat::Input

def before_shutdown 

def before_shutdown
  super
end

def initialize 

def initialize
  super
  unless self.class.ancestors.include?(Fluent::Compat::CallSuperMixin)
    self.class.prepend Fluent::Compat::CallSuperMixin
  end
end

def shutdown 

def shutdown
  super
end

def start

to make it sure to call super
These definitions are to get instance methods of superclass of 3rd party plugins 
def start
  super
end