Developer
<?php
namespace Illuminate\Support;
use Closure;
use InvalidArgumentException;
use RuntimeException;
abstract class MultipleInstanceManager
{
/**
* The application instance.
*
* @var \Illuminate\Contracts\Foundation\Application
*/
protected $app;
/**
* The array of resolved instances.
*
* @var array
*/
protected $instances = [];
/**
* The registered custom instance creators.
*
* @var array
*/
protected $customCreators = [];
/**
* Create a new manager instance.
*
* @param \Illuminate\Contracts\Foundation\Application $app
* @return void
*/
public function __construct($app)
{
$this->app = $app;
}
/**
* Get the default instance name.
*
* @return string
*/
abstract public function getDefaultInstance();
/**
* Set the default instance name.
*
* @param string $name
* @return void
*/
abstract public function setDefaultInstance($name);
/**
* Get the instance specific configuration.
*
* @param string $name
* @return array
*/
abstract public function getInstanceConfig($name);
/**
* Get an instance instance by name.
*
* @param string|null $name
* @return mixed
*/
public function instance($name = null)
{
$name = $name ?: $this->getDefaultInstance();
return $this->instances[$name] = $this->get($name);
}
/**
* Attempt to get an instance from the local cache.
*
* @param string $name
* @return mixed
*/
protected function get($name)
{
return $this->instances[$name] ?? $this->resolve($name);
}
/**
* Resolve the given instance.
*
* @param string $name
* @return mixed
*
* @throws \InvalidArgumentException
*/
protected function resolve($name)
{
$config = $this->getInstanceConfig($name);
if (is_null($config)) {
throw new InvalidArgumentException("Instance [{$name}] is not defined.");
}
if (! array_key_exists('driver', $config)) {
throw new RuntimeException("Instance [{$name}] does not specify a driver.");
}
if (isset($this->customCreators[$config['driver']])) {
return $this->callCustomCreator($config);
} else {
$driverMethod = 'create'.ucfirst($config['driver']).'Driver';
if (method_exists($this, $driverMethod)) {
return $this->{$driverMethod}($config);
} else {
throw new InvalidArgumentException("Instance driver [{$config['driver']}] is not supported.");
}
}
}
/**
* Call a custom instance creator.
*
* @param array $config
* @return mixed
*/
protected function callCustomCreator(array $config)
{
return $this->customCreators[$config['driver']]($this->app, $config);
}
/**
* Unset the given instances.
*
* @param array|string|null $name
* @return $this
*/
public function forgetInstance($name = null)
{
$name ??= $this->getDefaultInstance();
foreach ((array) $name as $instanceName) {
if (isset($this->instances[$instanceName])) {
unset($this->instances[$instanceName]);
}
}
return $this;
}
/**
* Disconnect the given instance and remove from local cache.
*
* @param string|null $name
* @return void
*/
public function purge($name = null)
{
$name ??= $this->getDefaultInstance();
unset($this->instances[$name]);
}
/**
* Register a custom instance creator Closure.
*
* @param string $name
* @param \Closure $callback
* @return $this
*/
public function extend($name, Closure $callback)
{
$this->customCreators[$name] = $callback->bindTo($this, $this);
return $this;
}
/**
* Dynamically call the default instance.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function __call($method, $parameters)
{
return $this->instance()->$method(...$parameters);
}
}
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