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
2. Let the others do the heavy lifting - boost your Ruby app with Java -
3. max
4. max ! klappradla " klappradla # klappradla.me
8. limits
9. GIL
10. blocking IO
12. non-blocking IO
16. “…gain the performance and concurrency benefits of Java without writing any Java code or XML” -joe kutner-
17. # ratpack.io
18. “Ratpack is a set of Java libraries for building modern HTTP applications”
19. “It is built on Java 8, Netty and reactive principles" # netty.io
20. “It provides just enough for writing practical, high performance, apps.”
21. code
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
23. # Gemfile gem 'jbundler' # Jarfile jar 'io.ratpack:ratpack-core', '1.4.0' jar 'org.slf4j:slf4j-simple', '1.7.20'
24. $ bundle install
25. $ jbundle install
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
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
28. blocking IO
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
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
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
32. non-blocking HTTP
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
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
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
37. # github.com/klappradla/jruby_ratpack_examples/sinatra
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
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
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