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class Channel < ActiveRecord::Base
  include 'singleton'

	

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class Earth
  include Singleton
end


a, b = Earth.instance, Earth.instance 
a == b 
#=> true

Earth.new 

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def verified
  source.try(:verified)
end


delegate :verified, :to => :source, :allow_nil => true

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- (void)startStandardUpdates
{
	if (nil == locationManager)
			locationManager = [[CLLocationManager alloc] init];
		locationManager.delegate = self;
		locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
		locationManager.distanceFilter = 10;    
		[locationManager startUpdatingLocation];
	}

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class Car
  attr_accessor :engine
  delegate :start, :stop, :to => :engine

  def	initialize(engine)
    @engine = engine
  end
end

class Engine

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class Car
  attr_accessor :engine

  def initialize(engine)
    @engine = engine
  end

  def start_engine
    @engine.start
  end

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class Car
  attr_accessor :engine

  def	initialize(engine)
    @engine = engine
  end

  def start_engine
    @engine.start
  end

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java.lang.SecurityException: class "json.ext.Parser$s_method_0_1$RUBYINVOKER$newInstance"'s signer information does not match signer information of other classes in the same package
	at java.lang.ClassLoader.checkCerts(ClassLoader.java:807)
	at java.lang.ClassLoader.preDefineClass(ClassLoader.java:488)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:626)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
	at org.jruby.util.JRubyClassLoader.defineClass(JRubyClassLoader.java:22)
	at org.jruby.internal.runtime.methods.InvocationMethodFactory.endClass(InvocationMethodFactory.java:1281)
	at org.jruby.internal.runtime.methods.InvocationMethodFactory.getAnnotatedMethodClass(InvocationMethodFactory.java:755)
	at org.jruby.internal.runtime.methods.InvocationMethodFactory.getAnnotatedMethod(InvocationMethodFactory.java:685)
	at org.jruby.RubyModule.defineAnnotatedMethod(RubyModule.java:794)

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def list
    session[:total_sources] ||= Source.count
    session[:source_search_params] ||= {}
    @search_params = session[:source_search_params]
    filter_list()
end