Reactive Ruby

Reactive Ruby - web apps with JRuby and Ratpack -

max

max ! klappradla " klappradla

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limits

$ GIL

blocking IO

client server db

client server db ⏳ ⏳

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non-blocking IO

client server db

client server db ⏳

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

# ratpack.io

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

“It provides just enough for writing practical, high performance, apps.” -ratpack.io-

#reactive )

“So let's cut the bullshit.
 Reactive programming is programming with asynchronous data streams” - @andrestaltz- # The introduction to Reactive Programming you've been missing

iterator ♻ + observer +

“non-blocking communication allows recipients to only consume resources while active, leading to less system overhead” - reactivemanifesto- # reactivemanifesto.org

# reactivex.io/ Rx* libs ,

# Get evens and square each some_source .select { |x| x.even? } .map { |x| x * x } .subscribe { |x| puts x.to_s } # github.com/ReactiveX/RxRuby

ratpack -

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

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

$ bundle install

$ bundle exec jbundle install

# github.com/klappradla/jruby_ratpack_examples/hello_world 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

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blocking IO ?

“A promise is a representation of a value which will become available later. Methods such as map(Function) […] allow a pipeline of “operations” to be specified, that the value will travel through as it becomes available.” -ratpack docs- # ratpack.io/manual/current/api/ratpack/exec/Promise.html

# ratpack.io/manual/current/async.html#performing_blocking_operations_eg_io 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 { DB[:albums].all } .then { |data| ctx.render(JSON.dump(data))} end end end

RatpackServer.start do |server| server.handlers do |chain| chain.get('music') do |ctx| Blocking .get { DB[:albums].all } .then { |data| ctx.render(JSON.dump(data))} end end end

RatpackServer.start do |server| server.handlers do |chain| chain.get('music') do |ctx| Blocking .get { DB[:albums].all } .map { |data| JSON.dump(data) } .then { |data| ctx.render(data)} end end end

non-blocking HTTP ?

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

# github.com/klappradla/jruby_ratpack_examples/http_example module Handler class Base def self.handle(ctx) new(ctx).handle end def initialize(ctx) @ctx = ctx end attr_reader :ctx def handle raise NotImplementedError end end end

# github.com/klappradla/jruby_ratpack_examples/http_example java_import 'ratpack.http.client.HttpClient' require_relative 'base' module Handler class Planets < Base URL = java.net.URI.new('http://swapi.co/api/planets') def handle ctx .get(HttpClient.java_class) .get(URL) .map { |resp| resp.get_body } .map { |body| body.get_text } .then { |data| render(data) } end private def render(data) resp = ctx.get_response header = 'application/json;charset=UTF-8' resp.send(header, data) end end end

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# github.com/klappradla/jruby_ratpack_examples/sinatra

# github.com/klappradla/jruby_ratpack_examples/benchmarks # Sinatra Running 30s test @ http://localhost:5050 4 threads and 100 connections Thread Stats Avg Stdev Max +/- Stdev Latency 284.63ms 358.37ms 1.95s 85.07% Req/Sec 145.18 72.13 434.00 65.54% 16392 requests in 30.08s, 64.94MB read Socket errors: connect 0, read 0, write 0, timeout 72 Non-2xx or 3xx responses: 1 Requests/sec: 545.00 Transfer/sec: 2.16MB # Ratpack Running 30s test @ http://localhost:5050 4 threads and 100 connections Thread Stats Avg Stdev Max +/- Stdev Latency 150.36ms 228.64ms 1.86s 88.18% Req/Sec 338.10 129.48 710.00 71.18% 32746 requests in 30.08s, 127.09MB read Requests/sec: 1088.56 Transfer/sec: 4.22MB

# github.com/klappradla/jruby_ratpack_examples/benchmarks # Sinatra Running 30s test @ http://localhost:5050 4 threads and 100 connections Thread Stats Avg Stdev Max +/- Stdev Latency 284.63ms 358.37ms 1.95s 85.07% Req/Sec 145.18 72.13 434.00 65.54% 16392 requests in 30.08s, 64.94MB read Socket errors: connect 0, read 0, write 0, timeout 72 Non-2xx or 3xx responses: 1 Requests/sec: 545.00 Transfer/sec: 2.16MB # Ratpack Running 30s test @ http://localhost:5050 4 threads and 100 connections Thread Stats Avg Stdev Max +/- Stdev Latency 150.36ms 228.64ms 1.86s 88.18% Req/Sec 338.10 129.48 710.00 71.18% 32746 requests in 30.08s, 127.09MB read Requests/sec: 1088.56 Transfer/sec: 4.22MB

# 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