deepak

class TestController < ApplicationController
  # To benchmark ActiveRecord connection-pool size
  # connection pool 5
  def ping
    t1 = Time.now
    1.upto(10) { Product.find(Integer(rand*1000)) }
    time_taken = (Time.now - t1)
    render :text => "time taken: #{time_taken.inspect}"
  end

deepak

#  how to name keys in redis for keyvalue stores

http://code.google.com/p/redis/wiki/TwitterAlikeExample
http://rediscookbook.org/introduction_to_storing_objects.html
http://www.slideshare.net/playnicelyapp/redis-schema-design-for-playnicely-redis-london-meetup
antirez has a book about keyvalue design in the pipeline
http://code.google.com/p/redis/wiki/IntroductionToRedisDataTypes

schema:
<namespace>:<globalObject>

deepak

# ri does not show private methods
# why and any way to force it to index and show private methods

ri Date#hour
ri DateTime #hour is a private method 
ri DateTime#hour #is not shown

deepak

# ruby caches the const lookup like method lookup
# due to this no need to explicitly memonize in code
# although, i think eval will break this cache
# TODO: what will clear the const/method cache
# http://yehudakatz.com/2010/02/25/rubys-implementation-does-not-define-its-semantics/

require 'benchmark'

LOGGER = 10

deepak

# -*- coding: utf-8 -*-

# http://yehudakatz.com/2010/02/25/rubys-implementation-does-not-define-its-semantics/
# Nathan de Vries, Posted February 25, 2010, 2:27 am
# From PickAxe:
# “If the last argument to a method is preceded by an ampersand, Ruby assumes that it is a Proc object. It removes it from
# the parameter list, converts the Proc object into a block, and associates it with the method.”
# Hence being referred by some as the “blockinator”. i.e. take the argument prefixed by “&” and convert it to a block so that
# the receiver can invoke it via “yield”. This idea of conversion to a block is what steered people towards overriding
# to_proc (for better or worse).

deepak

class Foo
  puts "define_method: #{defined?(define_method).inspect}"
  define_method(:bar) { puts "one" }
end

a = Foo.new
a.bar

class Foo
  class << self

deepak

deepak@octo:~$ rvm debug
ree-1.8.7-2010.02:
/home/deepak/.rvm/scripts/info: line 12: zsh: command not found

rvm 1.0.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/]
ree-1.8.7-2010.02:

  system:
    uname:       "Linux octo 2.6.32-25-generic #44-Ubuntu SMP Fri Sep 17 20:05:27 UTC 2010 x86_64 GNU/Linux"
    zsh:         ""

deepak

T0 = Thread.main

t1 = Thread.new(Thread.current) { |x| Thread.current[:parent] = x; sleep 1_00_000; }
t2 = Thread.new(Thread.current) { |x| Thread.current[:parent] = x; sleep 1_00_000; }

(t1[:parent] == t2[:parent]) && (t1[:parent] == T0)

__END__

# to find out the parent of a thread, ie. was spawned by which thread 

deepak

> type rvm | head -n1 
=> rvm is a function

> rvm debug > r.out 2> r.err.out
> cat r.out
=> 
 ree-1.8.7-2010.02:

rvm 1.0.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/]
ree-1.8.7-2010.02:

deepak

# went on a refactoring/beautification overdrive just so that the lines are under 80 columns
# ruby statements that overflow into the next row are an abomination :-)
# mangled production-code to remove const-names. It is not production or even code which has been run before 

# please refactor!! 
# * Any better way to make sure the long condition string is properly formatted
# * the gsub(/\s/, '') is also suspect as it would replace spaces etc in a proper sql

Comment.count(:id,
              :include => [:person, :had_commented],