Laravel源码解析之路由的使用和示例详解
前言 我的解析文章并非深层次多领域的解析攻略。但是参考着开发文档看此类文章会让你在日常开发中更上一层楼。 废话不多说,我们开始本章的讲解。 入口 Laravel启动后,会先加载服务提供者、中间件等组件,在查找路由之前因为我们使用的是门面,所以先要查到Route的实体类。 注册 第一步当然还是通过服务提供者,因为这是laravel启动的关键,在 RouteServiceProvider 内加载路由文件。 protected function mapApiRoutes() { Route::prefix('api') ->middleware('api') ->namespace($this->namespace) // 设置所处命名空间 ->group(base_path('routes/api.php')); //所得路由文件绝对路径 } 首先require是不可缺少的。因路由文件中没有命名空间。 IlluminateRoutingRouter 下方法 protected function loadRoutes($routes) { if ($routes instanceof Closure) { $routes($this); } else { $router = $this; require $routes; } } 随后通过路由找到指定方法,依旧是 IlluminateRoutingRouter 内有你所使用的所有路由相关方法,例如get、post、put、patch等等,他们都调用了统一的方法 addRoute public function addRoute($methods,$uri,$action) { return $this->routes->add($this->createRoute($methods,$action)); } 之后通过 IlluminateRoutingRouteCollection addToCollections 方法添加到集合中 protected function addToCollections($route) { $domainAndUri = $route->getDomain().$route->uri(); foreach ($route->methods() as $method) { $this->routes[$method][$domainAndUri] = $route; } $this->allRoutes[$method.$domainAndUri] = $route; } 添加后的结果如下图所示 实例化 依旧通过反射加载路由指定的控制器,这个时候build的参数$concrete = AppApiControllersXxxController public function build($concrete) { // If the concrete type is actually a Closure,we will just execute it and // hand back the results of the functions,which allows functions to be // used as resolvers for more fine-tuned resolution of these objects. if ($concrete instanceof Closure) { return $concrete($this,$this->getLastParameterOverride()); } $reflector = new ReflectionClass($concrete); // If the type is not instantiable,the developer is attempting to resolve // an abstract type such as an Interface of Abstract Class and there is // no binding registered for the abstractions so we need to bail out. if (! $reflector->isInstantiable()) { return $this->notInstantiable($concrete); } $this->buildStack[] = $concrete; $constructor = $reflector->getConstructor(); // If there are no constructors,that means there are no dependencies then // we can just resolve the instances of the objects right away,without // resolving any other types or dependencies out of these containers. if (is_null($constructor)) { array_pop($this->buildStack); return new $concrete; } $dependencies = $constructor->getParameters(); // Once we have all the constructor's parameters we can create each of the // dependency instances and then use the reflection instances to make a // new instance of this class,injecting the created dependencies in. $instances = $this->resolveDependencies( $dependencies ); array_pop($this->buildStack); return $reflector->newInstanceArgs($instances); } 这时将返回控制器的实例,下面将通过url访问指定方法,一般控制器都会继承父类 IlluminateRoutingController,laravel为其设置了别名 BaseController public function dispatch(Route $route,$controller,$method) { $parameters = $this->resolveClassMethodDependencies( $route->parametersWithoutNulls(),$method ); if (method_exists($controller,'callAction')) { return $controller->callAction($method,$parameters); } return $controller->{$method}(...array_values($parameters)); } Laravel通过controller继承的callAction去调用子类的指定方法,也就是我们希望调用的自定义方法。 public function callAction($method,$parameters) { return call_user_func_array([$this,$method],$parameters); } 致谢 感谢你看到这里,本篇文章源码解析靠个人理解。如有出入请拍砖。 以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持编程之家。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |