Java/Spring and Node.JS side by side

Java / Spring — Node.js

1995 Sun Microsystems Cross-platform Applet dedicated to the Web 2009
Ryan Dahl, Joyent, Node.js Foundation Asynchronous event driven framework built on top of Google V8 JS engine 2002 Pivotal Software Inversion of control container with extensions to ease JEE development JAVA SPRING NODE.JS

Platinum members

In the real world

Rewrote account overview page • Using JavaScript on both the
front-end and the back-end removed an artiﬁcial boundary between the browser and server, allowing engineers to code both • Built almost twice as fast with fewer people • Written in 33% fewer lines of code • Constructed with 40% fewer ﬁles • Double the requests per second vs. the Java application • 35% decrease in the average response time

Moved From Rails, 27 Servers Cut And Up To 20x
Faster • Much better performance and lower memory overhead than other tested options, running up to 20x faster in some scenarios • Programmers could leverage their JavaScript skills • Front-end and back-end mobile teams could be combined into a single unit • Servers were cut to 3 from 30. Enough headroom remains to handle 10x current levels of resource utilisation

Open Source project www.walmartlabs.com Powers our highly available real time
push notiﬁcations Completely re-engineered the application to increase eﬃciency and improve the partner and customer experience

“Node.js powers our web applications and has allowed our teams
to move much faster in bringing their designs to life” “On the server side, our entire mobile software stack is completely built in Node. One reason was scale. The second is Node showed us huge performance gains” “Node’s evented I/O model freed us from worrying about locking and concurrency issues that are common with multithreaded async I/O”

Node Package Management repository Largest module repository used by developers
in the world

library / module log4j spring-xyz libraryZ libraryY libraryX … …
…

library / module log4j spring-xyz libraryZ libraryY libraryX … …
Most of the Java containers use 1 Class Loader lib1.2

library / module archiver express moduleX m1 … … …
… m1 m1 m1 Modules work like JavaScript closure

Spring framework an IoC container that eases maintaining conﬁgurations and
switching implementations

public class MyComponent { @Autowired private PushService pushService; @PersistenceContext private
EntityManager entityManager; public Message process(Message msg) { … } } var config = require('config'); var push = require('./push'); var dao = require(config.dao); function process(message) { … } module.exports = { process: process }; www.npmjs.com/package/config a popular module to manage development to production configurations Node.js Spring IoC

Spring is also a series of projects that helps you
build web and enterprise applications

Web/mobile application WEB app Hybrid app Server DB Push

Java / Spring WEB app Hybrid app Server DB Push

JavaScript / Node.js WEB app Hybrid app Server DB Push
You already know the language!

<!DOCTYPE html> <html> <head> <script src="moment.js"></script> <script type="text/javascript"> function diff()
{ var start = document.forms[0].start.value; var end = document.forms[0].end.value; console.log(moment(end).diff(moment(start), 'days')); } </script> </head> <body> <form action="/api" method="POST"> <label for="start">Start</label> <input name="start" type="text"> <label for="end">End</label> <input name="end" type="text"> <input type="submit"> <input type="button" value="diff" onclick="diff()"> </form> </body> </html> @RequestMapping(  path = "/api",  method = RequestMethod.POST,  produces = "application/json") public String api(  @RequestBody String start,  @RequestBody String end) { DateTimeFormatter dtf =  DateTimeFormat.forPattern("yyyy-MM-dd"); LocalDate lStart = LocalDate.parse(start, dtf); LocalDate lEnd = LocalDate.parse(end, dtf);  ObjectNode res =  JsonNodeFactory.instance.objectNode();  int diff = Days.daysBetween(lStart, lEnd).getDays(); return res.put("diff", diff).toString(); } Web Server Web Page

<!DOCTYPE html> <html> <head> <script src="moment.js"></script> <script type="text/javascript"> function diff()
{ var start = document.forms[0].start.value; var end = document.forms[0].end.value; console.log(moment(end).diff(moment(start), 'days')); } </script> </head> <body> <form action="/api" method="POST"> <label for="start">Start</label> <input name="start" type="text"> <label for="end">End</label> <input name="end" type="text"> <input type="submit"> <input type="button" value="diff" onclick="diff()"> </form> </body> </html> var express = require('express') , bodyParser = require('body-parser') , moment = require('moment'); var app = express(); app.use(bodyParser.urlencoded({ extended: false })); app.use(express.static(__dirname + '/public')); app.post('/api', (req, res) => { var start = req.body.start; var end = req.body.end; var diff = moment(end).diff(moment(start), 'days'); res.json({ diff:diff }); }); app.listen(3000); Web Server Web Page

Run tests, package, minify, zip, manipulate ﬁles, git, generate manuals,
upload, … Building, Testing 25% of our time in dev.

Building It's much more powerful to use a full language
than writing build scripts from a ﬁxed set of directives

Building gulp.task('scripts', function() {  return gulp.src(ﬁndSources())  .pipe(jshint('.jshintrc'))  .pipe(jshint.reporter('default'))  .pipe(concat('main.js'))  .pipe(gulp.dest('dist/assets/js')) 
.pipe(rename({suﬃx: '.min'}))  .pipe(uglify())  .pipe(gulp.dest('dist/assets/js'))  .pipe(notify({ message: 'Task complete' }));  });

Testing Java / Spring, HTTP Client + Thread sleep? Node.js,
request + setTimeout but will it be a callback hell? Write a test that invokes the /api 4 times, in sequence with 1 second delay

Callback hell function test(body, callback) {  // POST 127.0.0.1:3000/api  }
test(body1, function(err, res) {  test(body2, function(err, res) {  test(body3, function(err, res) {  …  });  });  }); Move to Promises

Food for thought Using the same language everywhere is a
huge value for us Does a strongly typed language help you? There is a trend shared by the community to publish Node.js modules easy to use Asynchronous code has never been so easy

Food for thought Source code documentation is a key factor
when building an application with JavaScript The Node.js ecosystem does not compete yet with some sophisticated libraries It’s almost impossible to know what your Node.js program is doing at all times

THANK YOU

Java/Spring and Node.JS side by side

Java/Spring and Node.JS side by side

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Transcript

Java / Spring — Node.js

1995 Sun Microsystems Cross-platform Applet dedicated to the Web 2009

Platinum members

In the real world

Rewrote account overview page • Using JavaScript on both the

Moved From Rails, 27 Servers Cut And Up To 20x

Open Source project www.walmartlabs.com Powers our highly available real time

“Node.js powers our web applications and has allowed our teams

Node Package Management repository Largest module repository used by developers

library / module log4j spring-xyz libraryZ libraryY libraryX … …

library / module log4j spring-xyz libraryZ libraryY libraryX … …

library / module archiver express moduleX m1 … … …

Spring framework an IoC container that eases maintaining conﬁgurations and

public class MyComponent { @Autowired private PushService pushService; @PersistenceContext private

Spring is also a series of projects that helps you

Web/mobile application WEB app Hybrid app Server DB Push

Java / Spring WEB app Hybrid app Server DB Push

JavaScript / Node.js WEB app Hybrid app Server DB Push

<!DOCTYPE html> <html> <head> <script src="moment.js"></script> <script type="text/javascript"> function diﬀ()

<!DOCTYPE html> <html> <head> <script src="moment.js"></script> <script type="text/javascript"> function diﬀ()

Run tests, package, minify, zip, manipulate ﬁles, git, generate manuals,

Building It's much more powerful to use a full language

Building gulp.task('scripts', function() {  return gulp.src(ﬁndSources())  .pipe(jshint('.jshintrc'))  .pipe(jshint.reporter('default'))  .pipe(concat('main.js'))  .pipe(gulp.dest('dist/assets/js'))

Testing Java / Spring, HTTP Client + Thread sleep? Node.js,

Callback hell function test(body, callback) {  // POST 127.0.0.1:3000/api  }

function test(start, end, diﬀ) {  return new Promise((resolve, reject) =>

Food for thought Using the same language everywhere is a

Food for thought Source code documentation is a key factor

THANK YOU