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IoC container - Laravel Groningen

IoC container - Laravel Groningen

Did you know your IoC container can do a whole lot more than just constructor injection? Besides that it is actually packed with features. Inflectors, resolving callbacks, aliasing, method invocation to name a few. In this talk you will learn how to leverage the power of a great container and service providers to write better, loosely coupled code. Well designed code put together by your IoC container will make your applications SOLID, modular, lean and decoupled from the framework!

Hannes Van De Vreken

May 23, 2017
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  1. !

  2. class Service { public function calculate() { // Get stuff

    from FTP. // Do calculations. // Return result. } } WHAT IS IOC?
  3. class Service { public function __construct(Ftp $ftp) { } public

    function calculate() { // Get stuff from FTP. // Do calculations. // Return result. } } WHAT IS IOC?
  4. class Service { public function __construct(Ftp $ftp) { } public

    function calculate() { // Get stuff from FTP. // Add caching to prevent hitting FTP over and over again // Do calculations. // Return result. } } WHAT IS IOC?
  5. class Service { public function __construct(Ftp $ftp) { } public

    function calculate() { // Get stuff from FTP. // Add caching to prevent hitting FTP over and over again // Log that FTP is accessed. // Do calculations. // Return result. } } WHAT IS IOC?
  6. class Service { public function __construct(Ftp $ftp) { } public

    function calculate() { // Get stuff from FTP. // Add caching to prevent hitting FTP over and over again // Log that FTP is accessed. // Do calculations. // Return result. } } WHAT IS IOC?
  7. class FtpStorage { public function __construct(Ftp $ftp) { $this->ftp =

    $ftp; } public function get($key) { // Get it. // Cache it. // Log it. // Return it. } } WHAT IS IOC?
  8. class FtpStorage implements Storage { public function __construct(Ftp $ftp) {

    $this->ftp = $ftp; } public function get($key) { … } } WHAT IS IOC?
  9. class CacheDecorator implements Storage { public function __construct(Cache $cache, Storage

    $storage) {…} public function get($key) { return $this->cache->remember($key, 60, function () { return $this->storage->get($key); }); } } WHAT IS IOC?
  10. class LogDecorator implements Storage { public function __construct(LoggerInterface $log, Storage

    $storage) {…} public function get($key) { $this->log->info('Retrieved value for '.$key); return $this->storage->get($key); } } WHAT IS IOC?
  11. class FtpStorage implements Storage { public function __construct(Ftp $ftp) {

    $this->ftp = $ftp; } public function get($key) { // Get it and return it. } } WHAT IS IOC?
  12. Dependency inversion: Interface + implementation Dependency injection: Injecting `Storage` into

    `Service` Inversion of Control: The container builds your objects and calls them WHAT IS IOC?
  13. $container->get(Service::class); 1) Make FtpStorage 2) Wrap it with LogDecorator 3)

    Wrap LogDecorator instance with CacheDecorator 4) New up Service with CacheDecorator instance. WHAT IS IOC?
  14. class SendInvoice { public function __construct(Mailer $mailer) { $this->mailer =

    $mailer; } public function listen(InvoiceGeneratedEvent $event) { … } } CONSTRUCTOR INJECTION
  15. class ServiceProvider { public function register() { … } public

    function boot(Dispatcher $events) } REGISTRATION
  16. class ServiceProvider { protected $defer = true; public function register()

    {…} public function provides() { return [ Mailer::class, SwiftMailer::class, ]; } } REGISTRATION
  17. $this->app->bind('db.1', function () { return $this->app['db'] ->connection('db1'); }); $this->app ->when(EventListener::class)

    ->needs(ConnectionInterface::class) ->give('db.1'); REGISTRATION - CONTEXTUAL BINDING
  18. trait EnvironmentAware { public function setEnv($env) { $this->env = $env;

    } private function isEnv($envs): bool { return in_array($this->env, (array) $envs); } } REGISTRATION - CONTAINER EVENTS
  19. public function boot() { $this->app->resolving(function (LoggerAwareInterface $loggingObject) { $logger =

    $this->app->make(PsrLoggerInterface::class); $loggingObject->setLogger($logger); }); } REGISTRATION - CONTAINER EVENTS
  20. Also useful for: - Quickly injecting stuff - Injecting soft

    dependencies REGISTRATION - CONTAINER EVENTS
  21. Also useful for: - Quickly injecting stuff - Injecting soft

    dependencies REGISTRATION - CONTAINER EVENTS
  22. Also useful for: - Quickly injecting stuff - Injecting soft

    dependencies - Setting configurable values REGISTRATION - CONTAINER EVENTS
  23. $mailer = new Mailer(); $queue = new Queue(MailerInterface $mailer); $mailer->setQueueResolver(function

    () { return $this->app->make('queue'); }); BONUS CIRCULAR DEPENDENCIES