Laravel服務(wù)容器

oogh 發(fā)布于2019-06-27 15:35 / 3296人閱讀

摘要：框架底層解析本文參考陳昊框架關(guān)鍵技術(shù)解析，搭建一個(gè)屬于自己的簡(jiǎn)化版服務(wù)容器。服務(wù)容器建立項(xiàng)目空文件夾如添加，執(zhí)行目的是為了學(xué)習(xí)利用的自動(dòng)加載。

laravel框架底層解析

本文參考陳昊《Laravel框架關(guān)鍵技術(shù)解析》，搭建一個(gè)屬于自己的簡(jiǎn)化版服務(wù)容器。
其中涉及到反射、自動(dòng)加載，還是需要去了解一下。

laravel服務(wù)容器

建立項(xiàng)目空文件夾（如 mylaravel）

添加composer.json，執(zhí)行composer install

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "autoload": {
        "classmap": [
        ],
        "psr-4": {
            "App": "app/"
        }
    }
}

目的是為了學(xué)習(xí)、利用composer的自動(dòng)加載。

文件路徑如下所示

mylaravel

app

Traveller

Traveller.php

Visit

Leg.php

Visit.php

Container.php

Index.php

vendor

composer.json

簡(jiǎn)化版Container.php

getClosure($abstract, $concrete);
        }
    
        $this->bindings[$abstract] = compact("concrete", "shared");
    
    }
    //默認(rèn)的回調(diào)函數(shù)
    protected function getClosure($abstract, $concrete)
    {
        //生成實(shí)例的回調(diào)函數(shù)， $c一般為ioc容器對(duì)象
        return function($c) use ($abstract, $concrete)
        {
            $method = ($abstract == $concrete) ? "build" : "make";
            return $c->$method($concrete);
        };
    }
    //生成實(shí)例對(duì)象，首先解決接口和要實(shí)例化類之間的依賴
    public function make($abstract)
    {
        $concrete = $this->getConcrete($abstract);
        if ($this->isBuildable($concrete, $abstract)) {
            $object = $this->build($concrete);
        } else {
            $object = $this->make($concrete);
        }
        return $object;
    }
    protected function isBuildable($concrete, $abstract)
    {
        return $concrete === $abstract || $concrete instanceof Closure;
    }
    //獲取綁定的回調(diào)函數(shù)
    protected function getConcrete($abstract)
    {
        if ( ! isset($this->bindings[$abstract]))
        {
            return $abstract;
        }
        return $this->bindings[$abstract]["concrete"];
    }
    //實(shí)例化對(duì)象
    public function build($concrete)
    {
        if ($concrete instanceof Closure) {
            return $concrete($this);
        }
        $reflector = new ReflectionClass($concrete);
        if ( ! $reflector->isInstantiable()) {
            echo $message = "Target [$concrete] is not instantiable.";
        }
        $constructor = $reflector->getConstructor();
        if (is_null($constructor)) {
            return new $concrete;
        }
        $dependencies = $constructor->getParameters();
        $instances = $this->getDependencies($dependencies);
        return $reflector->newInstanceArgs($instances);
    }
    protected function getDependencies($parameters)
    {
        $dependencies = [];
        foreach ($parameters as $parameter)
        {
            $denpendency = $parameter->getClass();
            if (is_null($denpendency)) {
                $dependencies[] = NULL;
            } else {
                $dependencies[] = $this->resolveClass($parameter);
            }
        }
        return (array) $dependencies;
    }
    protected function resolveClass(ReflectionParameter $parameter)
    {
        return $this->make($parameter->getClass()->name);
    }
}

Visit.php接口


Leg.php接口的一種實(shí)現(xiàn)

Traveller.php相當(dāng)于Controller下的方法
trafficTool = $visit;
    }
    public function visitTibet()
    {
        $this->trafficTool->go();
    }
}
Index.php
bind("AppVisitVisit", "AppVisitLeg");
            $app->bind("Traveller", "AppTravellerTraveller");
            //通過(guò)容器實(shí)現(xiàn)依賴注入，完成類的實(shí)例化
            $tra = $app->make("AppTravellerTraveller");
            $tra->visitTibet();
    }
}

$b = new Index;
$b->index();