About Overriding controller actions from plugin

Rails
1

All,

Im having an issue while including the plugins actions index,show. I
need
to use my customized plugin actions instead of an existing functions.
Please any one help me out.

ror_project/app/controller/samples_controller.rb

class SamplesController < ApplicationController

def index
some actions
end

def show
some actions
end

def edit
end

end

My plugin called my_plugin ->
ror_project/vendor/my_plugin/app/controller/samples_controller.rb

class SamplesController < ApplicationController

def index
some actions
end

def show
some actions
end
end

The plugin actions are working when i removed the index & show from
controller. Otherwise it doesn’t. Can anyone tell what is the correct
steps
to
do it?.