STANDING ONTHE SHOULDERS

OF GIANTSWITH JRUBY

måndag 19 mars 12

Theo@iconara

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Chief Architect at

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ruby

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TL;DRMost of you are Java developersWriting Java is tediousThere’s truckloads of great Java librariesThe JVM is awesomeRuby is awesome∴ JRuby FTW

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I’M NOT HERE TO MAKE FUN OF JAVA

just

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JRuby vs. vanilla RubyReal threadsA working GCEvery Java, Scala and Ruby library ever madeAll the JVM awesomeness, JIT, the lot

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JRuby vs. JavaIt doesn’t make you want to stab yourself

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JRUBY ♥ JAVAA WHIRLWIND TOUR

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JRuby ♥ Javastuff = TreeMap.newstuff['windmill'] = 'rocket'stuff['pirate'] = 'bees'stuff.each do |something| # redactedend

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JRuby ♥ Javarequire 'java'require 'rabbitmq-client.jar'

import 'com.rabbitmq.client.ConnectionFactory'

factory = ConnectionFactory.new()factory.setUri('amqp://localhost:5672/')connection = factory.newConnection()

måndag 19 mars 12

JRuby ♥ Javarequire 'java'require 'rabbitmq-client.jar'

import 'com.rabbitmq.client.ConnectionFactory'

factory = ConnectionFactory.newfactory.uri = 'amqp://localhost:5672/'connection = factory.new_connection

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JRuby ♥ Javaclass Worker < Thread def run puts 'Hard work, no play' endend

# or

class Worker include Runnable def run puts 'Hard work, no play' endend

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JRuby ♥ Javapool = Executors.new_fixed_thread_pool(3)

memes = LinkedBlockingQueue.new

10.times do pool.submit do open('http://api.autome.me/text').read.each_line do |meme| memes << meme end endend

pool.shutdownpool.await_termination(3, TimeUnit::DAYS)

memes.each { |m| puts(m) }

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JRUBY FOR REPRESSED JAVA

DEVELOPERS

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Made up fact84% of Java devs don’t write tests because it’s way too much extra code to type.

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Testingpublic class Person { public final String firstName; public final String lastName; public Person(String firstName, String lastName) { this.firstName = firstName; this.lastName = lastName; } public String getFullName() { return String.format("%s %s", firstName, lastName); }

// omg I’m already bored}

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Testingclass TestPerson < Test::Unit::TestCase def setup @person = Person.new('James', 'Gosling') end

def test_full_name assert_equal('James Gosling', @person.full_name) endend

# this is TestUnit, it’s part of the stdlib

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Testingdescribe Person do describe '#full_name' do before do @person = Person.new('James', 'Gosling') end it 'is the first name and the last name with a space in-between' do @person.full_name.should == 'James Gosling' end endend

# this is RSpec, read more at rspec.info

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Made up factAnt was designed by the same people who came up with the QWERTY layout.

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Automation<?xml version="1.0"?><project name="MyProject" default="dist" basedir="."> <description> simple example build file </description> <!-- set global properties for this build --> <property name="src" location="src"/> <property name="build" location="build"/> <property name="dist" location="dist"/> <target name="init"> <!-- Create the time stamp --> <tstamp/> <!-- Create the build directory structure used by compile --> <mkdir dir="${build}"/> </target> <target name="compile" depends="init" description="compile the source "> <!-- Compile the java code from ${src} into ${build} --> <javac srcdir="${src}" destdir="${build}"/> </target> <target name="dist" depends="compile" description="generate the distribution"> <!-- Create the distribution directory --> <mkdir dir="${dist}/lib"/> <!-- And don’t get me started on Maven, $%&@*! --> <!-- Put everything in ${build} into the MyProject-${DSTAMP}.jar file --> <jar jarfile="${dist}/lib/MyProject-${DSTAMP}.jar" basedir="${build}"/> </target> <target name="clean" description="clean up"> <!-- Delete the ${build} and ${dist} directory trees --> <delete dir="${build}"/>

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Automationrequire 'ant'

src_dir = 'src'build_dir = 'build'dist_dir = 'dist'timestamp = Time.now

task :init do mkdir_p build_dirend

task :compile => :init do ant.javac :srcdir => src_dir, :destdir => build_dirend

task :dist => :compile do mkdir_p "#{dist_dir}/lib" ant.jar :jarfile => "#{dist_dir}/lib/MyProject-#{timestamp}.jar", :basedir => build_dirend

task :clean do rm_rf build_dir rm_rf dist_direndmåndag 19 mars 12

Made up factThe average number of lines in a Java web application is somewhere around 100 000

måndag 19 mars 12

Don’t make it so hardget '/' do erb :indexend

post '/register' do stuff.save(params[:name], params[:email], params[:shoe_size]) redirect '/thanks'end

get '/thanks' do @name = params[:name] erb :thanksend

# this is Sinatra, read more at sinatrarb.com

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Pack it up in a WAR and ship it$ warbler war

# warbler can be found at github.com/jruby/warbler# also check out torquebox.org, and github.com/trinidad/trinidad

måndag 19 mars 12

Make a console$ hbase shell

HBase Shell; enter 'help<RETURN>' for list of supported commands.Type "exit<RETURN>" to leave the HBase ShellVersion 0.90.4-cdh3u2, r, Thu Oct 13 20:32:26 PDT 2011

hbase(main):001:0> create 'test', 'cf'0 row(s) in 1.2200 secondshbase(main):002:0> put 'test', 'row1', 'cf:a', 'value1'0 row(s) in 0.0560 secondshbase(main):003:0> put 'test', 'row2', 'cf:b', 'value2'0 row(s) in 0.0370 seconds

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Monitoringrequire 'jmx'

client = JMX.connect(:port => 7199)

storage_service = client['org.apache.cassandra.db:type=StorageService']storage_service.keyspaces.each do |keyspace| puts keyspaceend

memory_mbean = client['java.lang:type=Memory']puts memory_mbean.heap_memory_usage.used

memory_mbean.gc

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Configurationconf = configuration do base_keys :api_key, :date dimension :path dimension :section dimension :country dimension :section, :country metric :pageviews metric :reach, :user_id, :type => :unique metric :clicks, :click?, :type => :predicateend

counters = conf.build!

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SNEAK SOME RUBY INTO THAT ENTERPRISE APPLICATION

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STANDING ONTHE SHOULDERS

OF GIANTSWITH JRUBY

måndag 19 mars 12

LET’S STACK SOME ABSTRACTIONS ON

TOP OF THEM THERE ABSTRACTIONS

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Our stack: RabbitMQWe use the Java driver, with a JRuby interface we call HotBunniesgithub.com/ruby-amqp/hot_bunnies

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Our stack: RabbitMQrequire 'hot_bunnies'

connection = HotBunnies.connect(:host => 'localhost')channel = connection.create_channelqueue = channel.queue('test_queue')queue.bind('test_exch', :routing_key => 'hi')

subscription = queue.subscribe(:ack => true, :blocking => false) do |headers, msg| # do awesome stuffend

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Our stack: MongoDBGo listen to David’s talk tomorrowWe use the Ruby driver, because we wouldn’t get anything done otherwise

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Our stack: MongoDBBasicDBObject doc = new BasicDBObject();doc.put("name", "MongoDB");doc.put("type", "database");doc.put("count", 1);

BasicDBObject info = new BasicDBObject();info.put("x", 203);info.put("y", 102);

doc.put("info", info);

coll.insert(doc);

vs.

coll.insert( 'name' => 'MongoDB', 'type' => 'database', 'count' => 1, 'info' => {'x' => 203, 'y' => 102})

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Our stack: CassandraWe use a JRuby wrapper on top of Pelopsgithub.com/iconara/eurydice

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Our stack: CassandraMutator mutator = Pelops.createMutator(pool);Column nameColumn = mutator.newColumn("name", "Dan");Column ageColumn = mutator.newColumn("age", Bytes.fromInt(33));List<Column> columns = mutator.newColumnList(nameColumn, ageColumn);mutator.writeColumns(columnFamily, rowKey, columns);mutator.execute(ConsistencyLevel.ONE);

vs.

columns = {'name' => 'Dan', 'age' => 33}column_family.update(row_key, columns, :consistency_level => :one)

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Our stack: AkkaScala is nice, but we’ve got better things to do than to wait for code to compileAkka is awesome, so we created Mikkagithub.com/iconara/mikka

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Our stack: Akkaclass Ping < Mikka::Actor def pre_start @pong = context.actor_of(Pong) @pong << :ping end

def receive(message) context.reply(:ping) endend

class Pong < Mikka::Actor def receive(message) context.reply(:pong) endend

ping = Mikka.actor_of(Ping).start

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Our stack: numbersWe process hundreds of millions of messages per day, using less than 20K lines of JRuby

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twitter.com/iconaraarchitecturalatrocities.com

burtcorp.com

måndag 19 mars 12