laravel cache get是怎么调用的?-Laravel

本文使用版本为laravel5.5

cache get

public function cache()    {        $c=\Cache::get('app');        if(!$c) {            \Cache::put('app', 'cache', 1);        }        dump($c);//cache    }

config/app.php

 '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,        'Broadcast' => Illuminate\Support\Facades\Broadcast::class,        'Bus' => Illuminate\Support\Facades\Bus::class,        'Cache' => Illuminate\Support\Facades\Cache::class,                ]

使用cache实际调用的是Illuminate\Support\Facades\Cache,这个映射是如何做的？

public/index.php

$response = $kernel->handle($request = Illuminate\Http\Request::capture());

bootstarp/app.php

$app->singleton(    Illuminate\Contracts\Http\Kernel::class,    App\Http\Kernel::class);

app/http/kernel.php

use Illuminate\Foundation\Http\Kernel as HttpKernel;class Kernel extends HttpKernel{}

Illuminate/Foundation/Http/Kernel.php

public function handle($request){    try {        $request->enableHttpMethodParameterOverride();        $response = $this->sendRequestThroughRouter($request);    } catch (Exception $e) {        $this->reportException($e);        $response = $this->renderException($request, $e);    } catch (Throwable $e) {        $this->reportException($e = new FatalThrowableError($e));        $response = $this->renderException($request, $e);    }    $this->app['events']->dispatch(        new Events\RequestHandled($request, $response)    );    return $response;}protected function sendRequestThroughRouter($request)    {        $this->app->instance('request', $request);        Facade::clearResolvedInstance('request');        $this->bootstrap();        return (new Pipeline($this->app))                    ->send($request)                    ->through($this->app->shouldSkipMiddleware() ? [] : $this->middleware)                    ->then($this->dispatchToRouter());    }    public function bootstrap()    {        if (! $this->app->hasBeenBootstrapped()) {            $this->app->bootstrapWith($this->bootstrappers());        }    }

Illuminate/Foundation/Application.php

public function bootstrapWith(array $bootstrappers)    {        $this->hasBeenBootstrapped = true;        foreach ($bootstrappers as $bootstrapper) {            $this['events']->fire('bootstrapping: '.$bootstrapper, [$this]);            $this->make($bootstrapper)->bootstrap($this);            $this['events']->fire('bootstrapped: '.$bootstrapper, [$this]);        }    }

Illuminate/Foundation/Bootstrap/RegisterFacades.php

public function bootstrap(Application $app)    {        Facade::clearResolvedInstances();        Facade::setFacadeApplication($app);//将config/app.php 里的aliases数组里面的Facades类设置别名        AliasLoader::getInstance(array_merge(            $app->make('config')->get('app.aliases', []),            $app->make(PackageManifest::class)->aliases()        ))->register();    }

Illuminate/Foundation/AliasLoader.php

public function load($alias)    {        if (static::$facadeNamespace && strpos($alias, static::$facadeNamespace) === 0) {            $this->loadFacade($alias);            return true;        }      // $alias来自于config/app.php中aliases数组         if (isset($this->aliases[$alias])) {            //'Route' => Illuminate\Support\Facades\Route::class,            // class_alias 为一个类创建别名            return class_alias($this->aliases[$alias], $alias);        }    }

Illuminate/Support/Facades/Cache.php

class Cache extends Facade{    /**     * Get the registered name of the component.     *     * @return string     */    protected static function getFacadeAccessor()    {        return 'cache';    }}

Illuminate/Support/Facades/Facade.php

这个文件没有get set ，只有__callStatic

public static function __callStatic($method, $args)    {        $instance = static::getFacadeRoot();        if (! $instance) {            throw new RuntimeException('A facade root has not been set.');        }        return $instance->$method(...$args);    }   public static function getFacadeRoot()    {        return static::resolveFacadeInstance(static::getFacadeAccessor());    }      protected static function resolveFacadeInstance($name)    {    //这里$name为cache        if (is_object($name)) {            return $name;        }        if (isset(static::$resolvedInstance[$name])) {            return static::$resolvedInstance[$name];        }    //$app是容器对象，实现了ArrayAccess接口，最终调用的还是容器的make方法        return static::$resolvedInstance[$name] = static::$app[$name];    }

IlluminateContainerContainer.php

public function make($abstract, array $parameters = [])    {        return $this->resolve($abstract, $parameters);    }    protected function resolve($abstract, $parameters = [])    {        $abstract = $this->getAlias($abstract);        $needsContextualBuild = ! empty($parameters) || ! is_null(            $this->getContextualConcrete($abstract)        );        // If an instance of the type is currently being managed as a singleton we'll        // just return an existing instance instead of instantiating new instances        // so the developer can keep using the same objects instance every time.        if (isset($this->instances[$abstract]) && ! $needsContextualBuild) {            return $this->instances[$abstract];        }        $this->with[] = $parameters;        $concrete = $this->getConcrete($abstract);        // We're ready to instantiate an instance of the concrete type registered for        // the binding. This will instantiate the types, as well as resolve any of        // its "nested" dependencies recursively until all have gotten resolved.        if ($this->isBuildable($concrete, $abstract)) {            $object = $this->build($concrete);        } else {            $object = $this->make($concrete);        }        // If we defined any extenders for this type, we'll need to spin through them        // and apply them to the object being built. This allows for the extension        // of services, such as changing configuration or decorating the object.        foreach ($this->getExtenders($abstract) as $extender) {            $object = $extender($object, $this);        }        // If the requested type is registered as a singleton we'll want to cache off        // the instances in "memory" so we can return it later without creating an        // entirely new instance of an object on each subsequent request for it.        if ($this->isShared($abstract) && ! $needsContextualBuild) {            $this->instances[$abstract] = $object;        }        $this->fireResolvingCallbacks($abstract, $object);        // Before returning, we will also set the resolved flag to "true" and pop off        // the parameter overrides for this build. After those two things are done        // we will be ready to return back the fully constructed class instance.        $this->resolved[$abstract] = true;        array_pop($this->with);        return $object;    }

Illuminate/Cache/CacheServiceProvider.php

 public function register()    {        $this->app->singleton('cache', function ($app) {            return new CacheManager($app);        });        $this->app->singleton('cache.store', function ($app) {            return $app['cache']->driver();        });        $this->app->singleton('memcached.connector', function () {            return new MemcachedConnector;        });    }

get set

$instance->$method(...$args)

laravel 中 Facades的原理以及代码剖析。