JRuby @ Boulder Ruby

Best of Ruby
and Java...
Together!

http://www.flickr.com/photos/texascooking/5864122096/

runs nearly all pure ruby code

runs 92% of rubyspec suite

runs ~30% of 1.9 test suite

(even more with 1.8 mode)

http://jruby.org/download

rvm install jruby

INSTALL gem install jruby-lint

$ jrlint

startup time

memory footprint

native code

no Kernel#fork

class Simple
  attr_accessor :next
end

top = Simple.new

puts Benchmark.measure {
  outer = 10
  total = 100000
  per = 100

  outer.times do
    total.times do
      per.times { Simple.new }
      s = Simple.new
      top.next = s
      top = s
    end
  end
}

Ruby 1.9.3 JRuby
8000

6000

4000

2000

0
GC count

Ruby 1.9.3 JRuby
10000

1000

100

10

1
GC count

15
Ruby 1.9.3 JRuby

12

9

6

3

0
GC time %

Time per GC versus heap usage

300ms

Ruby 2.0.0 JRuby
225ms

150ms

75ms

0ms
188KB/29MB 27MB/127MB 199MB/238MB

Heap usage (MRI/JRuby)

Ruby 1.9 Ruby 1.9
unthreaded threaded

JRuby JRuby
unthreaded threaded

sidekiq.org
What if 1 Sidekiq process could
do the work of 20 Resque or
DelayedJob processes?

Ruby application code

JVM bytecode Key

Native code

Ruby Ruby
Ruby code
code code
Ruby Ruby
JRuby JRuby JRuby
code code
Ruby
JVM JVM JRuby JVM JRuby
code

Full interpretation JRuby compiler HotSpot compiler

Time

Red-Black Tree
5

4
ruby 1.9.3p286
jruby 1.7.0 java 1.6.0_29
3
jruby 1.7.0 java 1.7.0_09
jruby 1.7.0 java 1.7.0_09-b05 +indy
2

1

0

Times Faster than Ruby 1.9.3
5
JRuby/Java 6 JRuby/Java 7+indy
4.226 4.32
3.75
3.66
3.44
2.5 2.658

1.914 1.806
1.25 1.538 1.565
1.346

0
base64 richards neural mandelbrot redblack

Get JDK 7
(OSX too!)
java.oracle.com

experthuman.com/
programming-with-
nothing
Tom Stuart
@tomstuart

(1..100).each do |n|
if (n % 15).zero?
puts 'FizzBuzz'
elsif (n % 3).zero?
puts 'Fizz'
elsif (n % 5).zero?
puts 'Buzz'
else
puts n.to_s
end
end

fizzbuzz = -> k { -> f { -> f { -> x { f[-> y { x[x][y] }] }[-> x {
f[-> y { x[x][y] }] }] }[-> f { -> l { -> x { -> g { -> b { b }[-> p {
p[-> x { -> y { x } } ] }[l]][x][-> y { g[f[-> l { -> p { p[-> x { ->
y { y } } ] }[-> p { p[-> x { -> y { y } } ] }[l]] }[l]][x][g]][-> l {
-> p { p[-> x { -> y { x } } ] }[-> p { p[-> x { -> y { y } } ] }[l]]
}[l]][y] }] } } } }][k][-> x { -> y { -> f { f[x][y] } } }[-> x { -> y
{ x } }][-> x { -> y { x } }]][-> l { -> x { -> l { -> x { -> x { -> y
{ -> f { f[x][y] } } }[-> x { -> y { y } }][-> x { -> y { -> f {
f[x][y] } } }[x][l]] } }[l][f[x]] } }] } }[-> f { -> x { f[-> y {
x[x][y] }] }[-> x { f[-> y { x[x][y] }] }] }[-> f { -> m { -> n { -> b
{ b }[-> m { -> n { -> n { n[-> x { -> x { -> y { y } } }][-> x { -> y
{ x } }] }[-> m { -> n { n[-> n { -> f { -> x { n[-> g { -> h {
h[g[f]] } }][-> y { x }][-> y { y }] } } }][m] } }[m][n]] }
}[m][n]][-> x { -> l { -> x { -> x { -> y { -> f { f[x][y] } } }[-> x
{ -> y { y } }][-> x { -> y { -> f { f[x][y] } } }[x][l]] } }[f[-> n {
-> p { -> x { p[n[p][x]] } } }[m]][n]][m][x] }][-> x { -> y { -> f {
f[x][y] } } }[-> x { -> y { x } }][-> x { -> y { x } }]] } } }][-> p {
-> x { p[x] } }][-> p { -> x {p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[
p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[
p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[p[
p[p[p[p[p[p[p[p[p[p[x]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]} }]][-> n { -> b {
b }[-> n { n[-> x { -> x { -> y { y } } }][-> x { -> y { x } }] }[-> f
{ -> x { f[-> y { x[x][y] }] }[-> x { f[-> y { x[x][y] }] }] }[-> f {
-> m { -> n { -> b { b }[-> m { -> n { -> n { n[-> x { -> x { -> y { y
} } }][-> x { -> y { x } }] }[-> m { -> n { n[-> n { -> f { -> x {
n[-> g { -> h { h[g[f]] } }][-> y { x }][-> y { y }] } } }][m] }

INVOKEDYNAMIC
[bootstrapMethod]

bootstrapMethod():
Call Site
CallSite (once)
target

Method
Handle

package java.lang.invoke;

public abstract class MethodHandle {
public final native Object invoke(Object... args)
throws Throwable;
}

java.lang.invoke.
MethodHandles
arrayElementGetter arrayElementSetter
spreadInvoker exactInvoker invoker
explicitCastArguments permuteArguments
constant identity insertArguments
dropArguments dropArguments
filterArguments filterReturnValue
foldArguments guardWithTest
catchException throwException

String literal
Constant lookup
Other literals
Instance variables
Method invocation
Math operations

require 'java'
require 'rubygems'
require 'flying_saucer'

java_import org.xhtmlrenderer.pdf.ITextRenderer

document = <<-HTML
<html><body><h1>Hello Flying Saucer!</h1></body></html>
HTML

File.open("doc.pdf", "wb") do |out|
renderer = ITextRenderer.new
renderer.set_document_from_string document
renderer.layout
renderer.create_pdf out.to_outputstream
end

system("open doc.pdf")

jruby -S gem install flying_saucer to try this example.

DECORATE
JAVA OBJECTS
WITH JRUBY

module java::util::Iterator
include Enumerable

def each
while has_next
yield self.next
end
end
end

DRIVE RUBY
FROM JAVA
(org.jruby.embed)

import org.jruby.embed.ScriptingContainer;

public class EmbedJRuby {
public static void main(String[] args) {
ScriptingContainer container = new ScriptingContainer();
container.runScriptlet("puts 'Hello from Ruby'");
}
}

(defn -main
"Call JRuby!"
[& args]
(doto (org.jruby.embed.ScriptingContainer.)
(.runScriptlet "puts 'Hello from Ruby!'")))

;; examples.clj
(def hmap (hash-map "foo" "FOO"
"bar" "BAR"
"baz" "BAZ"))

(println hmap)
(println (get hmap "bar"))
(println (contains? hmap "foo"))

# ruby
Java::clojure.main.main(["./examples.clj"])

github.com/
daveray/
familiar

Familiar.with do
# clojure.core functions here
# ‘-’ replaced with ‘_’
# e.g. hash-map => hash_map
end

Familiar.with do
r = ref(nil)

begin
ref_set r, 'foo'
rescue
puts "no transaction! #{$!}"
end

dosync do
ref_set r, 'foo'
end
p deref(r)
end

JRuby @ Boulder Ruby

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