/**
* Register a binding with the container.
*
* @param string $abstract
* @param \Closure|string|null $concrete
* @param bool $shared
* @return void
*/
public function bind($abstract, $concrete = null, $shared = false)
{
$this->dropStaleInstances($abstract);
// If no concrete type was given, we will simply set the concrete type to the
// abstract type. After that, the concrete type to be registered as shared
// without being forced to state their classes in both of the parameters.
if (is_null($concrete)) {
$concrete = $abstract;
}
// If the factory is not a Closure, it means it is just a class name which is
// bound into this container to the abstract type and we will just wrap it
// up inside its own Closure to give us more convenience when extending.
if (! $concrete instanceof Closure) {
$concrete = $this->getClosure($abstract, $concrete);
}
$this->bindings[$abstract] = compact('concrete', 'shared');
// If the abstract type was already resolved in this container we'll fire the
// rebound listener so that any objects which have already gotten resolved
// can have their copy of the object updated via the listener callbacks.
if ($this->resolved($abstract)) {
$this->rebound($abstract);
}
}
/**
* Drop all of the stale instances and aliases.
*
* @param string $abstract
* @return void
*/
protected function dropStaleInstances($abstract)
{
unset($this->instances[$abstract], $this->aliases[$abstract]);
}
/**
* Get the Closure to be used when building a type.
*
* @param string $abstract
* @param string $concrete
* @return \Closure
*/
protected function getClosure($abstract, $concrete)
{
return function ($container, $parameters = []) use ($abstract, $concrete) {
if ($abstract == $concrete) {
return $container->build($concrete);
}
return $container->resolve(
$concrete, $parameters, $raiseEvents = false
);
};
}
/**
* Determine if the given abstract type has been resolved.
*
* @param string $abstract
* @return bool
*/
public function resolved($abstract)
{
if ($this->isAlias($abstract)) {
$abstract = $this->getAlias($abstract);
}
return isset($this->resolved[$abstract]) ||
isset($this->instances[$abstract]);
}
/**
* Fire the "rebound" callbacks for the given abstract type.
*
* @param string $abstract
* @return void
*/
protected function rebound($abstract)
{
$instance = $this->make($abstract);
foreach ($this->getReboundCallbacks($abstract) as $callback) {
call_user_func($callback, $this, $instance);
}
}
bind第一步是销毁了之前绑定的instances和aliases,如果$concrete是空,那么就绑定$abstract自己
如果concrete不是闭包 就转换成闭包
$this->getClosure($abstract, $concrete);
绑定自身的话可以看到返回的是
return $container->build($concrete);
大概可以理解成
$bindings = [
'HelpSpot\API' => [//闭包绑定
'concrete' => function ($app, $paramters = []) {
return $app->build('HelpSpot\API');
},
'shared' => false//如果是singleton绑定，这个值为true
]
'Illuminate\Tests\Container\IContainerContractStub' => [//接口实现绑定
'concrete' => 'Illuminate\Tests\Container\ContainerImplementationStub',
'shared' => false
]
]