Laravel之Contracts和Facades详解
发布于2021-03-14 06:08 阅读(1487) 评论(0) 点赞(16) 收藏(4)
Contracts
Contracts其实就是倡导面向接口编程，来达到解耦的目的。而这些通用的接口已经由Laravel为你设计好了。就是这些Contracts.
那么Laravel如何知道我们需要使用哪个实现呢？
在Laravel默认的Contracts绑定中，在'Illuminate/Foundation/Application.php'有这样的定义:这就是绑定了默认的接口实现.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | /** * Register the core class aliases in the container. * * @return void */ public function registerCoreContainerAliases() { $aliases = [ 'app' => ['Illuminate\Foundation\Application', 'Illuminate\Contracts\Container\Container', 'Illuminate\Contracts\Foundation\Application'], 'auth' => 'Illuminate\Auth\AuthManager', 'auth.driver' => ['Illuminate\Auth\Guard', 'Illuminate\Contracts\Auth\Guard'], 'auth.password.tokens' => 'Illuminate\Auth\Passwords\TokenRepositoryInterface', 'blade.compiler' => 'Illuminate\View\Compilers\BladeCompiler', 'cache' => ['Illuminate\Cache\CacheManager', 'Illuminate\Contracts\Cache\Factory'], 'cache.store' => ['Illuminate\Cache\Repository', 'Illuminate\Contracts\Cache\Repository'], 'config' => ['Illuminate\Config\Repository', 'Illuminate\Contracts\Config\Repository'], 'cookie' => ['Illuminate\Cookie\CookieJar', 'Illuminate\Contracts\Cookie\Factory', 'Illuminate\Contracts\Cookie\QueueingFactory'], 'encrypter' => ['Illuminate\Encryption\Encrypter', 'Illuminate\Contracts\Encryption\Encrypter'], 'db' => 'Illuminate\Database\DatabaseManager', 'db.connection' => ['Illuminate\Database\Connection', 'Illuminate\Database\ConnectionInterface'], 'events' => ['Illuminate\Events\Dispatcher', 'Illuminate\Contracts\Events\Dispatcher'], 'files' => 'Illuminate\Filesystem\Filesystem', 'filesystem' => ['Illuminate\Filesystem\FilesystemManager', 'Illuminate\Contracts\Filesystem\Factory'], 'filesystem.disk' => 'Illuminate\Contracts\Filesystem\Filesystem', 'filesystem.cloud' => 'Illuminate\Contracts\Filesystem\Cloud', 'hash' => 'Illuminate\Contracts\Hashing\Hasher', 'translator' => ['Illuminate\Translation\Translator', 'Symfony\Component\Translation\TranslatorInterface'], 'log' => ['Illuminate\Log\Writer', 'Illuminate\Contracts\Logging\Log', 'Psr\Log\LoggerInterface'], 'mailer' => ['Illuminate\Mail\Mailer', 'Illuminate\Contracts\Mail\Mailer', 'Illuminate\Contracts\Mail\MailQueue'], 'auth.password' => ['Illuminate\Auth\Passwords\PasswordBroker', 'Illuminate\Contracts\Auth\PasswordBroker'], 'queue' => ['Illuminate\Queue\QueueManager', 'Illuminate\Contracts\Queue\Factory', 'Illuminate\Contracts\Queue\Monitor'], 'queue.connection' => 'Illuminate\Contracts\Queue\Queue', 'redirect' => 'Illuminate\Routing\Redirector', 'redis' => ['Illuminate\Redis\Database', 'Illuminate\Contracts\Redis\Database'], 'request' => 'Illuminate\Http\Request', 'router' => ['Illuminate\Routing\Router', 'Illuminate\Contracts\Routing\Registrar'], 'session' => 'Illuminate\Session\SessionManager', 'session.store' => ['Illuminate\Session\Store', 'Symfony\Component\HttpFoundation\Session\SessionInterface'], 'url' => ['Illuminate\Routing\UrlGenerator', 'Illuminate\Contracts\Routing\UrlGenerator'], 'validator' => ['Illuminate\Validation\Factory', 'Illuminate\Contracts\Validation\Factory'], 'view' => ['Illuminate\View\Factory', 'Illuminate\Contracts\View\Factory'], ]; |
在我们自定义的接口实现时，我们可以在ServiceProvider中使用进行绑定:
1 | $this->app->bind('App\Contracts\EventPusher', 'App\Services\PusherEventPusher'); |
Facades
Facades 为应用程序的服务容器中可用的类提供了一个「静态」接口。Laravel 「facades」作为在服务容器内基类的「静态代理」。很难懂？
我们打开项目目录下的config/app.php，然后找到
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | /* |-------------------------------------------------------------------------- | Class Aliases |-------------------------------------------------------------------------- | | This array of class aliases will be registered when this application | is started. However, feel free to register as many as you wish as | the aliases are "lazy" loaded so they don't hinder performance. | */ 'aliases' => [ 'App' => Illuminate\Support\Facades\App::class, 'Artisan' => Illuminate\Support\Facades\Artisan::class, 'Auth' => Illuminate\Support\Facades\Auth::class, 'Blade' => Illuminate\Support\Facades\Blade::class, 'Bus' => Illuminate\Support\Facades\Bus::class, 'Cache' => Illuminate\Support\Facades\Cache::class, 'Config' => Illuminate\Support\Facades\Config::class, 'Cookie' => Illuminate\Support\Facades\Cookie::class, 'Crypt' => Illuminate\Support\Facades\Crypt::class, 'DB' => Illuminate\Support\Facades\DB::class, 'Eloquent' => Illuminate\Database\Eloquent\Model::class, 'Event' => Illuminate\Support\Facades\Event::class, 'File' => Illuminate\Support\Facades\File::class, 'Gate' => Illuminate\Support\Facades\Gate::class, 'Hash' => Illuminate\Support\Facades\Hash::class, 'Input' => Illuminate\Support\Facades\Input::class, 'Lang' => Illuminate\Support\Facades\Lang::class, 'Log' => Illuminate\Support\Facades\Log::class, 'Mail' => Illuminate\Support\Facades\Mail::class, 'Password' => Illuminate\Support\Facades\Password::class, 'Queue' => Illuminate\Support\Facades\Queue::class, 'Redirect' => Illuminate\Support\Facades\Redirect::class, 'Redis' => Illuminate\Support\Facades\Redis::class, 'Request' => Illuminate\Support\Facades\Request::class, 'Response' => Illuminate\Support\Facades\Response::class, 'Route' => Illuminate\Support\Facades\Route::class, 'Schema' => Illuminate\Support\Facades\Schema::class, 'Session' => Illuminate\Support\Facades\Session::class, 'Storage' => Illuminate\Support\Facades\Storage::class, 'URL' => Illuminate\Support\Facades\URL::class, 'Validator' => Illuminate\Support\Facades\Validator::class, 'View' => Illuminate\Support\Facades\View::class, ], |
你是不是发现了什么？对，Facades其实就是在config/app.php中定义的一系列类的别名。只不过这些类都具有一个共同的特点，那就是继承基底 Illuminate\Support\Facades\Facade 类并实现一个方法：getFacadeAccessor返回名称。
自定义Facade
参考http://www.tutorialspoint.com/laravel/laravel_facades.htm
Step 1 −创建一个名为 TestFacadesServiceProvider的ServiceProvider ,使用如下命令即可:
php artisan make:provider TestFacadesServiceProvider
Step 2 − 创建一个底层代理类，命名为“TestFacades.php” at “App/Test”.
App/Test/TestFacades.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <?phpnamespace App\Test;class TestFacades{ public function testingFacades(){ echo "Testing the Facades in Laravel."; }}?> |
Step 3 − 创建一个 Facade 类 called “TestFacades.php” at “App/Test/Facades”.
App/Test/Facades/TestFacades.php
1 2 3 4 5 6 7 8 9 10 11 | <?phpnamespace app\Test\Facades;use Illuminate\Support\Facades\Facade;class TestFacades extends Facade{ protected static function getFacadeAccessor() { return 'test'; }} |
Step 4 −创建一个ServiceProviders类，名为“TestFacadesServiceProviders.php” at “App/Test/Facades”.
App/Providers/TestFacadesServiceProviders.php
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <?phpnamespace App\Providers;use App;use Illuminate\Support\ServiceProvider;class TestFacadesServiceProvider extends ServiceProvider { public function boot() { // } public function register() { //可以这么绑定,这需要use App; // App::bind('test',function() { // return new \App\Test\TestFacades; // }); //也可以这么绑定，推荐。这个test对应于Facade的getFacadeAccessor返回值 $this->app->bind("test", function(){ return new MyFoo(); //给这个Facade返回一个代理实例。所有对Facade的调用都会被转发到该类对象下。 }); }} |
Step 5 − 在config/app.php注册ServiceProvider类
Step 6 − 在config/app.php注册自定义Facade的别名
使用测试：
Add the following lines in app/Http/routes.php.
1 2 3 | Route::get('/facadeex', function(){ return TestFacades::testingFacades();}); |
Step 9 − Visit the following URL to test the Facade.
http://localhost:8000/facadeex去查看输出
更多学习内容请访问：
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原文链接:https://www.cnblogs.com/a609251438/p/12707971.html
所属网站分类: 技术文章 > 博客
作者：你是好人
链接：http://www.phpheidong.com/blog/article/3603/97b0fce7fed011cb8c09/
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