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Packages 143 43 44 $provider = new EntryProvider($database); 45 $archiver = new Archiver($provider); 46 $archiver->archive(); Woah Nelly! That’s a lot of code when compared to the first snippet; but it’s worth it. Firstly; we’re exposing so few details to the Archiver class that the entire entry dependency could be replaced in a heartbeat. This is possible because we’ve moved the database dependency out of the Archiver and into the EntryProvider. We’re also type-hinting an interface instead of a concrete class; which lets us swap the concrete class out with anything else that implements EntryProviderInterface. The concrete class can fetch the entries from the database, or the filesystem or whatever. We can test the EntryProvider class by swapping in a fake Database instance. We can test the Archiver class by swapping in a fake EntryProvider instance. So, to recap the requirements for dependency injection: 1. Don’t create class instances in other classes (if they are dependencies) — pass them into the class from outside. 2. Don’t type-hint concrete classes — create interfaces. “When you go and get things out of the refrigerator for yourself, you can cause problems. You might leave the door open, you might get something Mommy or Daddy doesn’t want you to have. You might even be looking for something we don’t even have or which has expired. What you should be doing is stating a need, ‘I need something to drink with lunch,’ and then we will make sure you have something when you sit down to eat.” — John Munsch You can learn more about Dependency Injection, from Taylor’s book, at: https://leanpub.com/laravel. . Inversion Of Control Inversion of Control (IoC) is the name given to the process that involves assembling class instances (and the resolution of class instances in general) within a container or registry. Where the registry pattern involves defining class instances and then storing them in some global container; IoC
Packages 144 involves telling the container how and where to find the instances so that they can be resolved as required. This naturally aids dependency injection as class instances adhering to abstracted requirements can easily be resolved without first creating. To put it another way; if our classes adhere to certain requirements (via interfaces) and the IoC container can resolve them to class instances, then we don’t have to do it beforehand. The easiest way to understand this is to look at some code: 1
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Laravel 4 Cookbook Christopher Pitt
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Contents Dedication . . . . . . . .
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CONTENTS Testing Endpoints . . . .
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CONTENTS Installing Dependencies .
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Forward Hi, my name is Wayne Ashley
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Why Write This Book I was learning
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Authentication If you’re anything
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Authentication 3 . This file should
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Authentication 5 1
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Authentication 7 Creating A Model L
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Authentication 9 1
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Authentication 11 . This file shoul
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Authentication 13 1 @section("foote
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Authentication 15 1 @extends("layou
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Authentication 17 We define the Use
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Authentication 19 1 public function
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Authentication 25 . This file shoul
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Authentication 27 18 public functio
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Authentication 29 . Laravel include
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Authentication 31 1
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Authentication 33 14 login 15 16 @
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Access Control List 35 17 18 return
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Access Control List 37 The BaseMode
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Access Control List 39 . This file
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Access Control List 41 Another impo
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Access Control List 43 1
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Access Control List 45 32 $value =
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Access Control List 47 116 } 117 11
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Access Control List 49 . This was e
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Access Control List 51 1 public fun
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Access Control List 69 . You need t
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Deployment There are few things whi
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Deployment 73 We’re going to make
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Deployment 75 70 InputOption::VALUE
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Deployment 77 . This file should be
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Deployment 79 1 protected function
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Deployment 81 56 ] 57 ]; 58 } 59 60
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Deployment 83 16 $code .= "\n ],";
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Deployment 85 53 { 54 return [ 55 [
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Deployment 87 15 ] 16 ] 17 ]; . Thi
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Deployment 89 1 2 3 4 5 Laravel
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Deployment 91 52 ); 53 } 54 55 retu
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Page 108 and 109: Deployment 95 63 InputArgument::REQ
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Page 112 and 113: Deployment 99 36 37 $listener->onMo
Page 114 and 115: Deployment 101 . You have to have t
Page 116 and 117: Deployment 103 . This was extracted
Page 118 and 119: Deployment 105 . It’s important t
Page 120 and 121: Deployment 107 43 " . $pattern . "
Page 122 and 123: Deployment 109 26 27 $command = "rs
Page 124 and 125: Deployment 111 Command Portability
Page 126 and 127: API 113 1 php artisan controller:ma
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Page 130 and 131: API 117 19 $table->text('descriptio
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Page 136 and 137: API 123 1 php artisan db:seed . If
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Page 140 and 141: API 127 17 * @return Response 18 */
Page 142 and 143: API 129 13 return Event::create([ 1
Page 144 and 145: API 131 23 Route::delete("event/{ev
Page 146 and 147: API 133 1 curl -X POST -d "name=foo
Page 148 and 149: API 135 1 public function setNameAt
Page 150 and 151: API 137 . Installing and running Me
Page 152 and 153: Packages Packages are the recommend
Page 154 and 155: Packages 141 Not so easy to test. T
Page 158 and 159: Packages 145 35 class Archiver impl
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Page 162 and 163: Packages 149 . To recap; the comman
Page 164 and 165: Packages 151 . This file should be
Page 166 and 167: Packages 153 25 { 26 // ...watch as
Page 168 and 169: Packages 155 . chine.php. The main
Page 170 and 171: Packages 157 75 { 76 return new Com
Page 180 and 181: Packages 167 18 }, 19 "minimum-stab
Page 182 and 183: Real Time Chat One of the most perv
Page 184 and 185: Real Time Chat 171 PHP supports thi
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Page 188 and 189: Real Time Chat 175 18 App.Applicati
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Page 192 and 193: Real Time Chat 179 16 17 public fun
Page 194 and 195: Real Time Chat 181 100 "message" =>
Page 196 and 197: Real Time Chat 183 16 return $this-
Page 198 and 199: Real Time Chat 185 39 40 $open = fu
Page 200 and 201: Real Time Chat 187 123 124 protecte
Page 202 and 203: Real Time Chat 189 debugging comman
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Real Time Chat 193 27 }); 28 29 App
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Real Time Chat 195 1 5 6 7 8 La
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Multisites If you’ve ever had to
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Multisites 199 This line tells the
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Multisites 201 . This site definiti
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Multisites 203 . you would expect v
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Multisites 205 1
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Multisites 207 1 Route::group([ 2 "
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Multisites 209 1
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Multisites 211 1 public function bo
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Multisites 213 1
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Multisites 215 To make multi-langua
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Multisites 217 . You can learn more
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Multisites 219 1 php artisan migrat
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Multisites 221 1 2 {{ $post->title
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E-Commerce 223 Once you have Compos
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E-Commerce 225 1 "require" : { 2 "d
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E-Commerce 227 1
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E-Commerce 229 1
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E-Commerce 231 10 Schema::create("p
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E-Commerce 233 1
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E-Commerce 235 1
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E-Commerce 237 18 public function r
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E-Commerce 239 1 php artisan tinker
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E-Commerce 241 18 $price = $faker->
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E-Commerce 243 33 34 $used[] = $pro
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E-Commerce 245 . This file should b
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E-Commerce 247 1
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E-Commerce 249 16 21 25 29 30
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E-Commerce 251 100 104 Add to bask
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E-Commerce 253 184 185 186 187
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E-Commerce 255 . This was extracted
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E-Commerce 257 1 app.factory("Categ
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E-Commerce 259 33 34 Price: @{{ pr
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E-Commerce 261 23 this.setCategory
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E-Commerce 263 . This was extracted
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E-Commerce 265 1 app.controller("pr
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E-Commerce 267 43 44 items.push({ 4
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E-Commerce 269 We’ve added a stat
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E-Commerce 271 82 placeholder="card
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E-Commerce 273 1 public function ad
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E-Commerce 275 85 } . This was extr
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E-Commerce 277 15 App::bind("billin
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E-Commerce 279 You can learn more a
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E-Commerce 281 1 public function ge
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E-Commerce 283 61 Quantity 62 Amoun
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E-Commerce 285 Last thing to hook u
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Embedded Systems What do you think
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Embedded Systems 289 1
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Embedded Systems 291 16 socket.addE
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Embedded Systems 293 12 public func
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Embedded Systems 295 1
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Embedded Systems 297 1 #include 2
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Embedded Systems 299 85 else 86 { 8
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Embedded Systems 301 . This file sh
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Embedded Systems 303 the message ev
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Embedded Systems 305 1 setInterval(
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File-Based CMS 307 1 composer updat
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File-Based CMS 309 1
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File-Based CMS 311 25 "Formativ\Cms
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File-Based CMS 313 1 protected func
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File-Based CMS 315 41 42 43 44
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File-Based CMS 317 1 public functio
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File-Based CMS 319 26 try 27 { 28 e
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File-Based CMS 321 1
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File-Based CMS 325 20 @foreach ($la
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File-Based CMS 327 20 == 21 "; 22 2
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File-Based CMS 329 1 Route::any("ad
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File-Based CMS 331 14 type="text" 1
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File-Based CMS 333 1 public functio
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File-Based CMS 335 43 44 return Vie
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File-Based CMS 337 127 "code" => "r
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File-Based CMS 339 27 Pages 28 29
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File-Based CMS 341 1 @extends("admi
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File-Based CMS 343 85 type="submit"
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File-Based CMS 345 72 class="form-c
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File-Based CMS 347 15 ) 16 { 17 $th
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File-Based CMS 349 99 } 100 } . Thi
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Controller Testing 351 1 composer
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Controller Testing 353 1 public fun
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Controller Testing 355 38 } . This
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Controller Testing 357 1
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Controller Testing 359 This makes t
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Controller Testing 361 29 ); 30 31
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Controller Testing 363 1 2 13 14
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Controller Testing 365 . You can fi
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Controller Testing 367 43 44 return
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Controller Testing 369 20 $requestM
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Controller Testing 371 25 [$reposit
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Controller Testing 373 109 $respons
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Controller Testing 375 . You can fi
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