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, $uri, $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 BaseControlle

public function dispatch(Route $route, $controller, $method)

{

$parameters = $this->resolveClassMethodDependencies(

$route->parametersWithoutNulls(), $controller, $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。