jRuby and Ratpack

Slides for my talk about jRuby and Ratpack.io at the vienna.rb Ruby Usergroup.

Transcript

1. Let the others do
   the heavy lifting
   

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2. Let the others do
   the heavy lifting
   - boost your Ruby app with Java -
   

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3. max
   

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4. max
   ! klappradla
   " klappradla
   # klappradla.me
   

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8. limits
   

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9. 
   GIL
   

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10. blocking IO
    

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12. non-blocking IO
    

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16. “…gain the performance and
    concurrency benefits of Java without
    writing any Java code or XML”
    -joe kutner-
    

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17. # ratpack.io
    

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18. “Ratpack is a set of Java libraries for
    building modern HTTP applications”
    

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19. “It is built on Java 8, Netty and
    reactive principles"
    # netty.io
    

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20. “It provides just enough for writing
    practical, high performance, apps.”
    

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21. code
    

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22. public class Main {
    public static void main(String... args) throws Exception {
    RatpackServer.start(server -> server
    .handlers(chain -> chain
    .get(ctx -> ctx.render("Hello World"))
    )
    );
    }
    }
    # https:/
    /ratpack.io/manual/current/launching.html#launching
    

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23. # Gemfile
    gem 'jbundler'
    # Jarfile
    jar 'io.ratpack:ratpack-core', '1.4.0'
    jar 'org.slf4j:slf4j-simple', '1.7.20'
    

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24. $ bundle install
    

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25. $ jbundle install
    

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26. require 'java'
    require 'jruby/core_ext'
    require 'bundler/setup'
    Bundler.require
    java_import 'ratpack.server.RatpackServer'
    RatpackServer.start do |server|
    server.handlers do |chain|
    chain.get do |ctx|
    ctx.render 'Hello World from Ratpack / jRuby'
    end
    end
    end
    # github.com/klappradla/jruby_ratpack_examples/hello_world
    

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27. # server.rb
    RatpackServer.start do |server|
    server.handlers do |chain|
    chain.get do |ctx|
    ctx.render 'Hello World from Ratpack / jRuby'
    end
    chain.all(Handler::Default)
    end
    end
    # handler/default.rb
    module Handler
    class Default
    def self.handle(ctx)
    ctx.render 'Nothing here, sorry ¯\_(ツ)_/¯'
    end
    end
    end
    # https:/
    /ratpack.io/manual/current/api/ratpack/handling/Handler.html
    

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28. blocking IO
    

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29. java_import 'ratpack.server.RatpackServer'
    java_import 'ratpack.exec.Blocking'
    require 'json'
    RatpackServer.start do |server|
    server.handlers do |chain|
    chain.get('music') do |ctx|
    Blocking.get do
    DB[:albums].all
    end.then do |albums|
    ctx.render(JSON.dump(albums))
    end
    end
    end
    end
    # https:/
    /ratpack.io/manual/current/async.html#performing_blocking_operations_eg_io
    

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30. # server
    RatpackServer.start do |server|
    server.handlers do |chain|
    chain.get('music', Handler::Music)
    end
    end
    # github.com/klappradla/jruby_ratpack_examples/db_example
    

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31. module Handler
    class Music
    class << self
    def handle(ctx)
    get_data.then do |data|
    render(ctx, data)
    end
    end
    private
    def get_data
    Blocking.get { DB[:albums].all }
    end
    def render(ctx, data)
    ctx.render(Jackson.json(data))
    end
    end
    end
    end
    # github.com/klappradla/jruby_ratpack_examples/db_example
    

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32. non-blocking HTTP
    

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33. class Server
    def self.run
    RatpackServer.start do |server|
    server.handlers do |chain|
    chain.all(RequestLogger.ncsa)
    chain.get('music', Handler::Music)
    chain.get('planets', Handler::Planets)
    chain.all(Handler::NotFound)
    end
    end
    end
    end
    # github.com/klappradla/jruby_ratpack_examples/http_example
    

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34. module Handler
    class Base
    def self.handle(args)
    new(*args).handle
    end
    def initialize(ctx)
    @ctx = ctx
    end
    def handle
    raise NotImplementedError
    end
    private
    attr_reader :ctx
    def response
    @response ||= ctx.get_response
    end
    end
    end
    # github.com/klappradla/jruby_ratpack_examples/http_example
    

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35. module Handler
    class Planets < Base
    URL = java.net.URI.new('http://swapi.co/api/planets')
    def handle
    call_api.then do |resp|
    render(resp)
    end
    end
    private
    def call_api
    client.get(URL)
    end
    def client
    ctx.get(HttpClient.java_class)
    end
    def render(resp)
    response.send(‘application/json;charset=UTF-8',
    resp.get_body.get_text)
    end
    end
    end
    # github.com/klappradla/jruby_ratpack_examples/http_example
    

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37. # github.com/klappradla/jruby_ratpack_examples/sinatra
    

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38. # sinatra
    Running 1m test @ http://localhost:5050
    4 threads and 100 connections
    Thread Stats Avg Stdev Max +/- Stdev
    Latency 302.15ms 417.23ms 1.99s 84.58%
    Req/Sec 122.99 63.97 380.00 66.50%
    29176 requests in 1.00m, 83.26MB read
    Socket errors: connect 0, read 0, write 0, timeout 552
    Non-2xx or 3xx responses: 9735
    Requests/sec: 485.58
    Transfer/sec: 1.39MB
    # ratpack
    Running 1m test @ http://localhost:5050
    4 threads and 100 connections
    Thread Stats Avg Stdev Max +/- Stdev
    Latency 183.24ms 255.69ms 1.97s 86.30%
    Req/Sec 328.76 141.23 830.00 68.23%
    78379 requests in 1.00m, 200.23MB read
    Socket errors: connect 0, read 0, write 0, timeout 13
    Non-2xx or 3xx responses: 26268
    Requests/sec: 1305.99
    Transfer/sec: 3.34MB
    # github.com/klappradla/jruby_ratpack_examples/benchmarks
    

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39. # github.com/klappradla/jruby_ratpack_examples/benchmarks
    # sinatra
    Running 1m test @ http://localhost:5050
    4 threads and 100 connections
    Thread Stats Avg Stdev Max +/- Stdev
    Latency 302.15ms 417.23ms 1.99s 84.58%
    Req/Sec 122.99 63.97 380.00 66.50%
    29176 requests in 1.00m, 83.26MB read
    Socket errors: connect 0, read 0, write 0, timeout 552
    Non-2xx or 3xx responses: 9735
    Requests/sec: 485.58
    Transfer/sec: 1.39MB
    # ratpack
    Running 1m test @ http://localhost:5050
    4 threads and 100 connections
    Thread Stats Avg Stdev Max +/- Stdev
    Latency 183.24ms 255.69ms 1.97s 86.30%
    Req/Sec 328.76 141.23 830.00 68.23%
    78379 requests in 1.00m, 200.23MB read
    Socket errors: connect 0, read 0, write 0, timeout 13
    Non-2xx or 3xx responses: 26268
    Requests/sec: 1305.99
    Transfer/sec: 3.34MB
    

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40. 
    # github.com/jruby/jruby/wiki/AboutJRuby
    # github.com/klappradla/jruby_ratpack_examples
    # blog.heroku.com/reactive_ruby_building_real_time_apps_with_jruby_and_ratpack
    

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