Overview of Derby.js and Meteor.js (for 7/10 NoVa Node.js Meetup)

David Rees
Derby & Meteor    .js                              .js

            The “next generation” of web development frameworks?

                             (thanks to Node.js)




David Rees
@studgeek                                           7/10/12
about.me/studgeek                                   Nova Node Meetup
Intro
• Just an overview, with focus on what they “are”

• Agenda
  •   Derby/Meteor - Common Concepts
  •   A little more about Derby
  •   A short Derby demo (Oooooo)
  •   A little more about Meteor
  •   A short Meteor demo (Ahhhhh)
  •   Discussion & Beers (Yummm)
Derby/Meteor – Common Concepts
Common Language
 •   Same language and thinking on server and client
 •   Same code and model structures
 •   Same libraries
 •   Same tools (IDE, debug, logging)
 •   Same developers
Base Development Framework
• All the core packages need to build a web application are
  included and integrated
• Node.js, Express, Socket.IO, MongoDB, Handlebars, Stylus,
  CoffeeScript
• Derby – Redis, Browserify, UglifyJS
• Meteor – Fibers
Model-Bound Templates
    • HTML is generated from HTML template
    • Variables are bound to model data
    • GUI updates automatically as the model properties change



<template name="hello”>
  <div>Hello there, {{first}} {{last}}!</div>    {first: "Alyssa", last: "Hacker"}
</template>




                        <div>Hello there, Alyssa Hacker!</div>
Synchronized Model State
• Clients, Servers, and database all share a common state
• Changes anywhere are synchronized everywhere (Socket.IO)
• Models are created, searched, and updated the same way
  everywhere
• “Subscriptions” manage what data is propagated where
Live Rendering
• Synchronized Model State publishes changes to
  clients/servers/browsers
• Model-Bound Templates recognize changes in their Models
• So… HTML is “magically” updated everywhere

• Subscriptions filter what is pushed where
• Templates control what is updated
• Local data can be used with model events to manage when
  HTML updates
Misc
• Changes in code are automatically pushed to all clients (as
  view updates)
• Open Source (MIT)
• Neither is production ready yet
  • Security is biggest “to do” (unless you really trust your users)
Derby
Derby: Templates
• Derby-specific template approach based on Handlebars
• Uses knockout/angular-style model property bindings
• Only changed parts are updated as the model properties
  change (like Knockout)
Derby: Templates Cont.
• Reuse (“components”)
  <Body:>
   <app:nav>
  <nav:>
   <ul>{{each navItems}}<app:navItem>{{/}}</ul>
  <navItem:>
   <li><a href="{{link}}">{{title}}</a></li>



• Recently added “widgets” which extend the tag library
  <boot:tabs current={test.currentTab}>
    <boot:tab title="One">
     Stuff
    </boot:tab>
    <boot:tab title="Two">
     More stuff
    </boot:tab>
   </boot:tabs>
Derby: Server-Side Template
Rendering
• Pages are initially rendered on server as HTML and then
  pushed to client
• Results in real HTML being pushed to client (rather than
  generated on client)
• Additional changes are then handled on client

• More SEO friendly
• Probably more mobile friendly also

• Meteor plans to implement
Derby: Routes
• Routes are defined Express/Sinatra style
• Initially generated on server and pushed to client
• Subsequent route accesses reuse client HTML
    // Routes render on client as well as server
    get('/', function (page, model) {
      // Subscribe specifies the data to sync to client
      // Can also use fetch for static data
      model.subscribe('users', function () {
        // Render the page (server), reuse the template (client)
        page.render('home');
      });
    });



• Includes history support
• “Transitional” routes support local updates (DOM/CSS changes)
• Form submits can be captured and used on client
Derby: Models (Racer)
• “Models” are synchronized stores using Redis
   • Optionally backed by MongoDB
   • Supports conflict resolution (very basic so far)
• Data is made available on client by subscribing to a path
    model.subscribe(’users', callback);


• Model access/mutation is very data/path-centric
    var model = store.createModel();
    model.set('users.Dave.favoriteBeer', 'Racer 5');
    var dave = model.at('users.Dave');
    dave.set('favoriteBeer', 'Racer 5');


• Queries support more fine-grained subscriptions
    // Server code
    store.query.expose(’olderUsers', 'olderThan', function (age) {
      return this.where('age').gt(age);
    });

    // App code
    var eligibleVotersQuery = model.query(‘olderUsers').olderThan(20);
    model.subscribe(eligibleVotersQuery, callback);
Derby: Misc
• Installed and used as normal NPM package(s)
• Core developers are using it for other project
  • “focused on building our app”
Derby Demo
Meteor
Meteor: Templates
• Use any template engine you want
• Entire template section is regenerated when underlying model
  properties change
• Pushes view generation JavaScript to client (no HTML)
  • This is a serious SEO issue – try googling for meteor.com
Meteor: Full Build/Package
Environment
• Goal is to be a complete development environment
• Improves on rails/express with simpler file structure
  • Much less boilerplate than Derby
• “Improves” on npm with “dynamic packages”
  • npm-like, not documented yet
• Uses node and node packages internally
Meteor: Build/Deployment
• You (must) use meteor to create
     meteor create myapp
• You use meteor (not node) to run
     meteor
• For play you can use their servers
     meteor deploy <anything you want>
• Or you can bundle a normal node app for deployment
     meteor bundle
Meteor: Misc
• Installed as a .sh
      curl install.meteor.com | /bin/sh

• Getting a lot more community love so far
  • Meteor folks seems to be better (and more focused) on SMO


                                          Meteo   Derby
                                          r
               GitHub Watchers            4060    924

               GutHub Forks               324     54

               StackOverflow Qs           312     12
Meteor Demo
Last Thoughts (IMHO)
• Both have great potential
  • Demonstrate what is possible with common language
  • Show Node can be more than Ruby in JavaScript
• Security/scaling issues need to be (and will be) solved

• Personally digging Derby a bit more right now
  •   Normal packages and building
  •   Property-level bindings
  •   HTML in browser
  •   But worried about core developer’s support

• I do prefer some aspects of Meteor though
  • Super simple for simple stuff
  • Less generated boilerplate
  • More community love
Q&A&B




             Will tweet slides…
David Rees
@studgeek                           7/10/12
about.me/studgeek                   Nova Node Meetup
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Overview of Derby.js and Meteor.js (for 7/10 NoVa Node.js Meetup)

  • 1. Derby & Meteor .js .js The “next generation” of web development frameworks? (thanks to Node.js) David Rees @studgeek 7/10/12 about.me/studgeek Nova Node Meetup
  • 2. Intro • Just an overview, with focus on what they “are” • Agenda • Derby/Meteor - Common Concepts • A little more about Derby • A short Derby demo (Oooooo) • A little more about Meteor • A short Meteor demo (Ahhhhh) • Discussion & Beers (Yummm)
  • 4. Common Language • Same language and thinking on server and client • Same code and model structures • Same libraries • Same tools (IDE, debug, logging) • Same developers
  • 5. Base Development Framework • All the core packages need to build a web application are included and integrated • Node.js, Express, Socket.IO, MongoDB, Handlebars, Stylus, CoffeeScript • Derby – Redis, Browserify, UglifyJS • Meteor – Fibers
  • 6. Model-Bound Templates • HTML is generated from HTML template • Variables are bound to model data • GUI updates automatically as the model properties change <template name="hello”> <div>Hello there, {{first}} {{last}}!</div> {first: "Alyssa", last: "Hacker"} </template> <div>Hello there, Alyssa Hacker!</div>
  • 7. Synchronized Model State • Clients, Servers, and database all share a common state • Changes anywhere are synchronized everywhere (Socket.IO) • Models are created, searched, and updated the same way everywhere • “Subscriptions” manage what data is propagated where
  • 8. Live Rendering • Synchronized Model State publishes changes to clients/servers/browsers • Model-Bound Templates recognize changes in their Models • So… HTML is “magically” updated everywhere • Subscriptions filter what is pushed where • Templates control what is updated • Local data can be used with model events to manage when HTML updates
  • 9. Misc • Changes in code are automatically pushed to all clients (as view updates) • Open Source (MIT) • Neither is production ready yet • Security is biggest “to do” (unless you really trust your users)
  • 10. Derby
  • 11. Derby: Templates • Derby-specific template approach based on Handlebars • Uses knockout/angular-style model property bindings • Only changed parts are updated as the model properties change (like Knockout)
  • 12. Derby: Templates Cont. • Reuse (“components”) <Body:> <app:nav> <nav:> <ul>{{each navItems}}<app:navItem>{{/}}</ul> <navItem:> <li><a href="{{link}}">{{title}}</a></li> • Recently added “widgets” which extend the tag library <boot:tabs current={test.currentTab}> <boot:tab title="One"> Stuff </boot:tab> <boot:tab title="Two"> More stuff </boot:tab> </boot:tabs>
  • 13. Derby: Server-Side Template Rendering • Pages are initially rendered on server as HTML and then pushed to client • Results in real HTML being pushed to client (rather than generated on client) • Additional changes are then handled on client • More SEO friendly • Probably more mobile friendly also • Meteor plans to implement
  • 14. Derby: Routes • Routes are defined Express/Sinatra style • Initially generated on server and pushed to client • Subsequent route accesses reuse client HTML // Routes render on client as well as server get('/', function (page, model) { // Subscribe specifies the data to sync to client // Can also use fetch for static data model.subscribe('users', function () { // Render the page (server), reuse the template (client) page.render('home'); }); }); • Includes history support • “Transitional” routes support local updates (DOM/CSS changes) • Form submits can be captured and used on client
  • 15. Derby: Models (Racer) • “Models” are synchronized stores using Redis • Optionally backed by MongoDB • Supports conflict resolution (very basic so far) • Data is made available on client by subscribing to a path model.subscribe(’users', callback); • Model access/mutation is very data/path-centric var model = store.createModel(); model.set('users.Dave.favoriteBeer', 'Racer 5'); var dave = model.at('users.Dave'); dave.set('favoriteBeer', 'Racer 5'); • Queries support more fine-grained subscriptions // Server code store.query.expose(’olderUsers', 'olderThan', function (age) { return this.where('age').gt(age); }); // App code var eligibleVotersQuery = model.query(‘olderUsers').olderThan(20); model.subscribe(eligibleVotersQuery, callback);
  • 16. Derby: Misc • Installed and used as normal NPM package(s) • Core developers are using it for other project • “focused on building our app”
  • 19. Meteor: Templates • Use any template engine you want • Entire template section is regenerated when underlying model properties change • Pushes view generation JavaScript to client (no HTML) • This is a serious SEO issue – try googling for meteor.com
  • 20. Meteor: Full Build/Package Environment • Goal is to be a complete development environment • Improves on rails/express with simpler file structure • Much less boilerplate than Derby • “Improves” on npm with “dynamic packages” • npm-like, not documented yet • Uses node and node packages internally
  • 21. Meteor: Build/Deployment • You (must) use meteor to create meteor create myapp • You use meteor (not node) to run meteor • For play you can use their servers meteor deploy <anything you want> • Or you can bundle a normal node app for deployment meteor bundle
  • 22. Meteor: Misc • Installed as a .sh curl install.meteor.com | /bin/sh • Getting a lot more community love so far • Meteor folks seems to be better (and more focused) on SMO Meteo Derby r GitHub Watchers 4060 924 GutHub Forks 324 54 StackOverflow Qs 312 12
  • 24. Last Thoughts (IMHO) • Both have great potential • Demonstrate what is possible with common language • Show Node can be more than Ruby in JavaScript • Security/scaling issues need to be (and will be) solved • Personally digging Derby a bit more right now • Normal packages and building • Property-level bindings • HTML in browser • But worried about core developer’s support • I do prefer some aspects of Meteor though • Super simple for simple stuff • Less generated boilerplate • More community love
  • 25. Q&A&B Will tweet slides… David Rees @studgeek 7/10/12 about.me/studgeek Nova Node Meetup

Editor's Notes

  1. Notes:Derby and Meteor have a pretty different model for how how subscriptions/channels are handled