[ruby-core:84336] [Ruby trunk Feature#9992] Access Modifiers (Internal Interfaces)

Issue #9992 has been updated by dsferreira (Daniel Ferreira).


What about this use case:

~~~ruby
module Foo; end

##
# Template class
#
# ==== Example
#         
#          Foo::SubClass.run(:arg1)
#          #=> ...

class Foo::Base
  
  def self.run(*args)
      self.new(*args).perform
  end

  public_class_method :run

  ##
  # Override abstract method

  def perform
     raise NotImplementedError
  end

  internal :perform

end

##
# Test subclass.
# 
# ==== Example
#
#          Foo::Bar.run("Hello!")
#          # => My argument is Hello!

class Foo::Bar < Foo:Base

    def perform(arg1)
        puts "My argument is: " + arg1
    end

    internal :perform

end
~~~

Currently we need to make `perform` method public but it would be great if we could have the public interface showing only the singleton `run` method.


----------------------------------------
Feature #9992: Access Modifiers (Internal Interfaces)
https://bugs.ruby-lang.org/issues/9992#change-68502

* Author: dsferreira (Daniel Ferreira)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Hi,
 
I’m would like to discuss with you the concept of Internal Interfaces.
 
Currently ruby offers three access modifiers choices to set methods visibility:

- public
- protected
- private

Public methods define what we may call the Public Interface.
Private methods are private to the class and its subclasses.
Protected methods are public for the subclasses.
 
I would like to work with a new access modifier that would allow the creation of Internal methods.
 
Internal methods would be object methods that could only be called within the namespace.
 
Ex:

~~~ruby
module Foo; end

class Foo::Bar

  def baz 
     puts ‘baz’
  end

  internal :baz

end

class Foo::Qux

  def baz
     ::Foo::Bar.new.baz
  end

  public :baz

end
~~~

What about this use case:

~~~ruby
module Foo; end

##
# Template class
#
# ==== Example
#         
#          Foo::SubClass.run(:arg1)
#          #=> ...

class Foo::Base
  
  def self.run(*args)
      self.new(*args).perform
  end

  public_class_method :run

  ##
  # Override abstract method

  def perform
     raise NotImplementedError
  end

  internal :perform

end

##
# Test subclass.
# 
# ==== Example
#
#          Foo::Bar.run("Hello!")
#          # => My argument is Hello!

class Foo::Bar < Foo:Base

    def perform(arg1)
        puts "My argument is: " + arg1
    end

    internal :perform

end

Is this something that we can think about in a future implementation of ruby?
An extra feature that would not break backward compatibility.
 
Cheers,
Daniel



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