class_methods.rb

class ClassMethodClient
  def self.get_thing
    "thing"
  end

  def self.put_thing(thing)
    nil
  end
end

puts "get: #{ClassMethodClient.get_thing}"
puts "put: #{ClassMethodClient.put_thing("other")}"
puts "what does this do: #{ClassMethodClient.new}"
puts ClassMethodClient.is_a? Class  # true
puts ClassMethodClient.is_a? Object # true

ObjectClient = Class.new do
  def get_thing
    "thing"
  end

  def put_thing(thing)
    nil
  end
end.new

puts "get: #{ObjectClient.get_thing}"
puts "put: #{ObjectClient.put_thing("other")}"
begin
  puts "what does this do: #{ObjectClient.new}"
rescue => e
  puts "can't ObjectClient.new: #{e.message}"
end

puts ObjectClient.is_a? Class  # false
puts ObjectClient.is_a? Object # true

require 'singleton'

class SingletonClient
  include Singleton

  def get_thing
    "thing"
  end

  def put_thing(thing)
    nil
  end
end

begin
  puts "what does this do: #{SingletonClient.new}"
rescue => e
  puts "can't SingletonClient.new: #{e.message}"
end

puts SingletonClient.is_a? Class  # true
puts SingletonClient.is_a? Object # true

puts "get: #{SingletonClient.instance.get_thing}"
puts "put: #{SingletonClient.instance.put_thing("other")}"
begin
  puts "what does this do: #{SingletonClient.instance.new}"
rescue => e
  puts "can't SingletonClient.instance.new: #{e.message}"
end


puts SingletonClient.instance.is_a? Class  # false
puts SingletonClient.instance.is_a? Object # true