Laravel框架 之 IoC实现
2018-05-23 本文已影响42人
诺之林
本文的示例代码参考IoC3
目录
Startup
关于IoC基础知识和日常使用 可以参考这两篇文章
Leavel1
vim Level1.php
<?php
class Container {
protected $bindings = [];
public function bind($abstract, $concrete = null, $shared = false) {
$this->bindings[$abstract] = compact('concrete', 'shared');
}
public function make($abstract) {
$concrete = $this->getConcrete($abstract);
$object = $this->build($concrete);
return $object;
}
public function build($concrete) {
$reflector = new ReflectionClass($concrete);
return $reflector->newInstanceArgs();
}
protected function getConcrete($abstract) {
if (isset($this->bindings[$abstract])) {
return $this->bindings[$abstract]['concrete'];
}
return $abstract;
}
}
class JPAService {
function __construct() {
print 'JPAService: __construct';
}
}
$app = new Container();
$app->bind('service', 'JPAService');
$app->make('service');
- 测试
php Level1.php
JPAService: __construct
Leavel2
vim Level2.php
<?php
class Container {
protected $bindings = [];
public function bind($abstract, $concrete = null, $shared = false) {
$this->bindings[$abstract] = compact('concrete', 'shared');
}
public function make($abstract) {
$concrete = $this->getConcrete($abstract);
$object = $this->build($concrete);
return $object;
}
public function build($concrete) {
// 新增代码
if ($concrete instanceof Closure) {
return $concrete($this);
}
$reflector = new ReflectionClass($concrete);
return $reflector->newInstanceArgs();
}
protected function getConcrete($abstract) {
if (isset($this->bindings[$abstract])) {
return $this->bindings[$abstract]['concrete'];
}
return $abstract;
}
}
class JPAService {
private $driver;
function __construct($driver) {
$this->driver = $driver;
}
}
$app = new Container();
$app->bind('service', function () {
return new JPAService('MySQL');
});
$service = $app->make('service');
var_dump($service);
- 测试
php Level2.php
object(JPAService)#3 (1) {
["driver":"JPAService":private]=>
string(5) "MySQL"
}
Leavel3
vim Level3.php
<?php
class Container {
protected $bindings = [];
public function bind($abstract, $concrete = null, $shared = false) {
$this->bindings[$abstract] = compact('concrete', 'shared');
}
public function make($abstract) {
$concrete = $this->getConcrete($abstract);
$object = $this->build($concrete);
return $object;
}
public function build($concrete) {
if ($concrete instanceof Closure) {
return $concrete($this);
}
$reflector = new ReflectionClass($concrete);
// 新增代码
$constructor = $reflector->getConstructor();
$dependencies = $constructor->getParameters();
$instances = $this->resolveDependencies($dependencies);
return $reflector->newInstanceArgs($instances);
}
protected function getConcrete($abstract) {
if (isset($this->bindings[$abstract])) {
return $this->bindings[$abstract]['concrete'];
}
return $abstract;
}
// 新增代码
protected function resolveDependencies($parameters) {
$dependencies = [];
foreach ($parameters as $parameter) {
$dependency = $parameter->getClass();
if (! is_null($dependency)) {
$dependencies[] = $this->resolveClass($parameter);
}
}
return $dependencies;
}
// 新增代码
protected function resolveClass(ReflectionParameter $parameter) {
return $this->make($parameter->getClass()->name);
}
}
class JPAService {
function __construct() {
print "JPAService: __construct\n";
}
}
class Controller {
private $service;
function __construct(JPAService $service) {
$this->service = $service;
}
}
$app = new Container();
$app->bind('service', 'JPAService');
$app->bind('controller', 'Controller');
$controller = $app->make('controller');
var_dump($controller);
- 测试
php Level3.php
JPAService: __construct
object(Controller)#5 (1) {
["service":"Controller":private]=>
object(JPAService)#8 (0) {
}
}
想要了解Laravel IoC的完整实现 可以参考Laravel IoC源码
