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    <h3>Editing: QueueManager.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Queue;

use Closure;
use Illuminate\Contracts\Queue\Factory as FactoryContract;
use Illuminate\Contracts\Queue\Monitor as MonitorContract;
use InvalidArgumentException;

/**
 * @mixin \Illuminate\Contracts\Queue\Queue
 */
class QueueManager implements FactoryContract, MonitorContract
{
    /**
     * The application instance.
     *
     * @var \Illuminate\Contracts\Foundation\Application
     */
    protected $app;

    /**
     * The array of resolved queue connections.
     *
     * @var array
     */
    protected $connections = [];

    /**
     * The array of resolved queue connectors.
     *
     * @var array
     */
    protected $connectors = [];

    /**
     * Create a new queue manager instance.
     *
     * @param  \Illuminate\Contracts\Foundation\Application  $app
     * @return void
     */
    public function __construct($app)
    {
        $this-&gt;app = $app;
    }

    /**
     * Register an event listener for the before job event.
     *
     * @param  mixed  $callback
     * @return void
     */
    public function before($callback)
    {
        $this-&gt;app['events']-&gt;listen(Events\JobProcessing::class, $callback);
    }

    /**
     * Register an event listener for the after job event.
     *
     * @param  mixed  $callback
     * @return void
     */
    public function after($callback)
    {
        $this-&gt;app['events']-&gt;listen(Events\JobProcessed::class, $callback);
    }

    /**
     * Register an event listener for the exception occurred job event.
     *
     * @param  mixed  $callback
     * @return void
     */
    public function exceptionOccurred($callback)
    {
        $this-&gt;app['events']-&gt;listen(Events\JobExceptionOccurred::class, $callback);
    }

    /**
     * Register an event listener for the daemon queue loop.
     *
     * @param  mixed  $callback
     * @return void
     */
    public function looping($callback)
    {
        $this-&gt;app['events']-&gt;listen(Events\Looping::class, $callback);
    }

    /**
     * Register an event listener for the failed job event.
     *
     * @param  mixed  $callback
     * @return void
     */
    public function failing($callback)
    {
        $this-&gt;app['events']-&gt;listen(Events\JobFailed::class, $callback);
    }

    /**
     * Register an event listener for the daemon queue stopping.
     *
     * @param  mixed  $callback
     * @return void
     */
    public function stopping($callback)
    {
        $this-&gt;app['events']-&gt;listen(Events\WorkerStopping::class, $callback);
    }

    /**
     * Determine if the driver is connected.
     *
     * @param  string|null  $name
     * @return bool
     */
    public function connected($name = null)
    {
        return isset($this-&gt;connections[$name ?: $this-&gt;getDefaultDriver()]);
    }

    /**
     * Resolve a queue connection instance.
     *
     * @param  string|null  $name
     * @return \Illuminate\Contracts\Queue\Queue
     */
    public function connection($name = null)
    {
        $name = $name ?: $this-&gt;getDefaultDriver();

        // If the connection has not been resolved yet we will resolve it now as all
        // of the connections are resolved when they are actually needed so we do
        // not make any unnecessary connection to the various queue end-points.
        if (! isset($this-&gt;connections[$name])) {
            $this-&gt;connections[$name] = $this-&gt;resolve($name);

            $this-&gt;connections[$name]-&gt;setContainer($this-&gt;app);
        }

        return $this-&gt;connections[$name];
    }

    /**
     * Resolve a queue connection.
     *
     * @param  string  $name
     * @return \Illuminate\Contracts\Queue\Queue
     *
     * @throws \InvalidArgumentException
     */
    protected function resolve($name)
    {
        $config = $this-&gt;getConfig($name);

        if (is_null($config)) {
            throw new InvalidArgumentException(&quot;The [{$name}] queue connection has not been configured.&quot;);
        }

        return $this-&gt;getConnector($config['driver'])
                        -&gt;connect($config)
                        -&gt;setConnectionName($name);
    }

    /**
     * Get the connector for a given driver.
     *
     * @param  string  $driver
     * @return \Illuminate\Queue\Connectors\ConnectorInterface
     *
     * @throws \InvalidArgumentException
     */
    protected function getConnector($driver)
    {
        if (! isset($this-&gt;connectors[$driver])) {
            throw new InvalidArgumentException(&quot;No connector for [$driver].&quot;);
        }

        return call_user_func($this-&gt;connectors[$driver]);
    }

    /**
     * Add a queue connection resolver.
     *
     * @param  string  $driver
     * @param  \Closure  $resolver
     * @return void
     */
    public function extend($driver, Closure $resolver)
    {
        return $this-&gt;addConnector($driver, $resolver);
    }

    /**
     * Add a queue connection resolver.
     *
     * @param  string  $driver
     * @param  \Closure  $resolver
     * @return void
     */
    public function addConnector($driver, Closure $resolver)
    {
        $this-&gt;connectors[$driver] = $resolver;
    }

    /**
     * Get the queue connection configuration.
     *
     * @param  string  $name
     * @return array|null
     */
    protected function getConfig($name)
    {
        if (! is_null($name) &amp;&amp; $name !== 'null') {
            return $this-&gt;app['config'][&quot;queue.connections.{$name}&quot;];
        }

        return ['driver' =&gt; 'null'];
    }

    /**
     * Get the name of the default queue connection.
     *
     * @return string
     */
    public function getDefaultDriver()
    {
        return $this-&gt;app['config']['queue.default'];
    }

    /**
     * Set the name of the default queue connection.
     *
     * @param  string  $name
     * @return void
     */
    public function setDefaultDriver($name)
    {
        $this-&gt;app['config']['queue.default'] = $name;
    }

    /**
     * Get the full name for the given connection.
     *
     * @param  string|null  $connection
     * @return string
     */
    public function getName($connection = null)
    {
        return $connection ?: $this-&gt;getDefaultDriver();
    }

    /**
     * Get the application instance used by the manager.
     *
     * @return \Illuminate\Contracts\Foundation\Application
     */
    public function getApplication()
    {
        return $this-&gt;app;
    }

    /**
     * Set the application instance used by the manager.
     *
     * @param  \Illuminate\Contracts\Foundation\Application  $app
     * @return $this
     */
    public function setApplication($app)
    {
        $this-&gt;app = $app;

        foreach ($this-&gt;connections as $connection) {
            $connection-&gt;setContainer($app);
        }

        return $this;
    }

    /**
     * Dynamically pass calls to the default connection.
     *
     * @param  string  $method
     * @param  array  $parameters
     * @return mixed
     */
    public function __call($method, $parameters)
    {
        return $this-&gt;connection()-&gt;$method(...$parameters);
    }
}
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