laravel cache get 是如何调用的?

摘要：本文使用版本为使用实际调用的是这个映射是如何做的将里的数组里面的类设置别名来自于中数组为一个类创建别名这个文件没有，只有这里为是容器对象，实现了接口，最终调用的还是容器的方法

本文使用版本为laravel5.5

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

 "aliases" => [

        "App" => IlluminateSupportFacadesApp::class,
        "Artisan" => IlluminateSupportFacadesArtisan::class,
        "Auth" => IlluminateSupportFacadesAuth::class,
        "Blade" => IlluminateSupportFacadesBlade::class,
        "Broadcast" => IlluminateSupportFacadesBroadcast::class,
        "Bus" => IlluminateSupportFacadesBus::class,
        "Cache" => IlluminateSupportFacadesCache::class,
        
        ]

使用cache实际调用的是IlluminateSupportFacadesCache,这个映射是如何做的？

$response = $kernel->handle(
$request = IlluminateHttpRequest::capture()
);

$app->singleton(
    IlluminateContractsHttpKernel::class,
    AppHttpKernel::class
);

use IlluminateFoundationHttpKernel as HttpKernel;

class Kernel extends HttpKernel
{

}

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);
    }

    $this->app["events"]->dispatch(
        new EventsRequestHandled($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());
        }
    }

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]);
        }
    }

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();
    }

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[$alias])) {
            //"Route" => IlluminateSupportFacadesRoute::class,
            // class_alias 为一个类创建别名
            return class_alias($this->aliases[$alias], $alias);
        }
    }

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

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];
    }

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;
    }

 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;
        });
    }

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