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。