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Building Backbone.js Apps for Scale
1.
Building Backbone.js apps
for scale Patrick Camacho Crashlytics 1 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
2.
Wednesday, October 24,
12
3.
Wednesday, October 24,
12
4.
Our experience with
Backbone.js +----------------------+-------+-------+---------+---------+-----+-------+ | Name | Lines | LOC | Classes | Methods | M/C | LOC/M | +----------------------+-------+-------+---------+---------+-----+-------+ | Apps | 232 | 143 | 2 | 16 | 8 | 9 | | Controllers | 885 | 644 | 10 | 57 | 6 | 11 | | Helpers | 407 | 280 | 13 | 45 | 3 | 6 | | Models | 739 | 492 | 23 | 192 | 8 | 3 | Large Scale | Collections | Routers | Views | | | 503 | 239 | 6052 | 385 | 171 | 4820 | 27 | 3 | 201 | 96 | 8 | 767 | 4 | 3 | 3 | 4 | 21 | 6 | Web Apps | Backbone Views | 346 | 287 | 14 | 29 | 2 | 10 | | Item Views | 3887 | 3124 | 124 | 456 | 4 | 7 | | Collection Views | 76 | 64 | 5 | 16 | 3 | 4 | +----------------------+-------+-------+---------+---------+-----+-------+ | Composite Views | 745 | 563 | 18 | 99 | 6 | 6 | | Name | Layouts | Lines 965 | LOC || Classes 164Methods | | | | 762 39 | | | 4 | 5 M/C | LOC/M | +----------------------+-------+-------+---------+---------+-----+-------+ | Regions | 28 | 20 | 1 | 3 | 3 | 7 | | Total +----------------------+-------+-------+---------+---------+-----+-------+ 4 | | 10746 | 8313 | 278 | 1181 | 6 | +----------------------+-------+-------+---------+---------+-----+-------+ | CoffeeScript Total | 9033 | 6918 | 278 | 1181 | 4 | 6 | +----------------------+-------+-------+---------+---------+-----+-------+ | Templates | 1713 | 1413 | -- | -- | -- | -- | +----------------------+-------+-------+---------+---------+-----+-------+ | Total | 10746 | 8313 | 278 | 1181 | 4 | 6 | +----------------------+-------+-------+---------+---------+-----+-------+ 4 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
5.
Our experience with
Backbone.js First App Second App man-hours man-hours 5 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
6.
Our experience with
Backbone.js 3000 2250 92% Faster 1500 750 What changed? 0 6 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
7.
Structure and flow
7 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
8.
Why Backbone.js?
‣ Pros ‣ Cons • MV* components • A toolset, not a framework • Built for RESTful APIs • Hard to grow teams around • Simple to pick up and use • No established patterns 8 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
9.
What does Backbone.js
give us? Model Views Backbone.Model, Backbone.Views Backbone.Collection Routing Events Backbone.Router, Backbone.Events Backbone.History MV* Building Blocks (to use as you see fit) not scalable 9 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
10.
Backbone.js flavored MVP
‣ Our patterns Views • One router, no logic HTML • Backbone Models / Collections • Views (HTML) Presenters • Presenters (Backbone.View) Backbone.View • Directors (App State Managers) Directors App State Managers 10 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
11.
Backbone.js app structure
App $(document).ready 11 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
12.
Backbone.js app structure
App Helpers Router Directors 12 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
13.
Backbone.js app structure
App Helpers Router Directors Backbone.History.start() 13 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
14.
Backbone.js app structure
App Helpers Router Directors Views Models 14 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
15.
Backbone.js app structure
App Helpers Router Directors Views Models HTML 15 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
16.
Backbone.js app structure
App Helpers Router Directors Views Models HTML 16 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
17.
Backbone.js app structure
App Helpers Router Directors Browser History Navigation Views Models HTML 17 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
18.
Keep code maintainable
18 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
19.
Test everything
it 'instantiates the application if a valid name is passed in', -> spyOn CLS.Apps, 'Crashlytics' CLS.init 'Crashlytics' expect(CLS.Apps.Crashlytics).toHaveBeenCalled() ‣ Clarify the thought ‣ Minimize risks ‣ Document functionality 19 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
20.
Use prototypes and
chaining var current_page; $(".next").click(function () { clear_list(); current_page = current_page + 1; update_page(); $("#previous").removeClass('disabled'); var issues = $('<div class="issue-list" />'); ... $(".prev").click(function () { if(current_page != 1){ current_page = current_page - 1; update_page(); if(current_page == 1){ $("#previous").addClass('disabled'); } var issues = $('<div class="issue-list" />'); ... “Spaghetti” code 20 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
21.
Use prototypes and
chaining class Navigation extends Backbone.View tagName : 'nav' id : 'navigation' events : 'click .previous' : 'previous' 'click .next' : 'next' initialize : (options = {}) -> @currentPage = options.currentPage or 1 @renderIssues() ... class Issues extends Backbone.View tagName : 'ul' id : 'issues' ... OOP 21 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
22.
Composite architecture
Layout ‣ Backbone.Marionette Region Region ‣ Building blocks ‣ Limited dependencies Item Collection Item Item 22 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
23.
State management
‣ Backbone.StateManager ‣ Web apps are stateful ‣ Lose the conditional statements 23 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
24.
Keep your code
organized 24 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
25.
Namespace and file
structure ‣ One Object per file ‣ File names line up with Object names ‣ Directory structure maps to namespace models organization.coffee class CLS.Models.Organization 25 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
26.
Automation FTW 26
CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
27.
Save time, be
standardized ‣ Compilers and watchers ‣ Scaffolding / generating ‣ Asset management 27 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
28.
Coming soon...
‣ Command line interface ‣ Scalable development SOPs ‣ Application flow / architecture ‣ Automated test generation ‣ Clear file and code organization 28 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
29.
Thank You
Patrick Camacho Crashlytics 29 CRASHLYTICS CONFIDENTIAL © 2012. All rights reserved Wednesday, October 24, 12
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