Container

Provides an extensible Dependency Injection Service Container for Automated Object Composition, Interception, and Lifetime Management.

Installation

You can install the package via composer:

composer require ghostwriter/container

Usage

Simple usage

Registering a service on the given container.

final readonly class Service
{
    public function __construct(
        private Dependency $dependency
    ) {}

    public function dependency():Dependency
    {
        return $this->dependency;
    }
}

$container = Container::getInstance();

$service = $container->get(Service::class);

assert($service instanceof Service); // true

assert($service->dependency() instanceof Dependency); // true

Automatic Service Definition Registration

Automatically register a service definition class using Composer's extra config in your composer.json file.

Important

A service definition class MUST implement Ghostwriter\Container\Interface\Service\DefinitionInterface [class].

It should look like the following:

{
    "extra": {
        "ghostwriter": {
            "container": {
                "definition": "App\\Service\\Definition"
            }
        }
    }
}

Service Definition

Registering a service definition on the container.

interface TaskInterface {}
interface TaskCollectionInterface {
    public function add(TaskInterface $task): void;
    public function count(): int;
}

final readonly class MainTask implements TaskInterface {
    public function __construct(
        private string $name
    ) {}
}

final readonly class FirstTask implements TaskInterface {
    public function __construct(
        private string $name
    ) {}
}

final class TaskCollection implements TaskCollectionInterface
{
    private array $tasks = [];
    public function add(TaskInterface $task): void
    {
        $this->tasks[] = $task;
    }
    public function count(): int
    {
        return count($this->tasks);
    }
}
final class TaskCollectionFactory implements FactoryInterface
{
    public function __invoke(ContainerInterface $container): TaskCollection
    {
        return new TaskCollection();
    }
}
final class TaskCollectionExtension implements ExtensionInterface
{
    /** @param TaskCollection $service */
    public function __invoke(ContainerInterface $container, object $service): void
    {
        $service->add(new FirstTask('Task 1'));
        
        $mainTask = $container->build(TaskInterface::class, ['name' => 'Main Task']);
        
        assert($mainTask instanceof MainTask); // true
        
        $service->add($mainTask);
    }
}

final readonly class TasksServiceDefinition implements DefinitionInterface
{
    public function __invoke(ContainerInterface $container)
    {
        $container->alias(MainTask::class, TaskInterface::class);
        $container->alias(TaskCollection::class, TaskCollectionInterface::class);
        $container->extend(TaskCollection::class, TaskCollectionExtension::class);
        $container->factory(TaskCollection::class, TaskCollectionFactory::class);
    }
}

$container = Container::getInstance();

$container->define(TasksDefinition::class);

$service = $container->get(TaskCollectionInterface::class); 
assert($service instanceof TaskCollection); // true

assert($service->count() === 2); // true

Contextual Bindings

Registering a Contextual Bindings on the container.

interface ClientInterface {}

final readonly class RestClient implements ClientInterface {}

final readonly class GraphQLClient implements ClientInterface {}

final readonly class GitHub
{
    public function __construct(
        private ClientInterface $client
    ) {
    }
    public function getClient(): ClientInterface
    {
        return $this->client;
    }
}

// When GitHub::class asks for ClientInterface::class, it would receive an instance of GraphQLClient::class.
$container->bind(GitHub::class, ClientInterface::class, GraphQLClient::class);

// When any other service asks for ClientInterface::class, it would receive an instance of RestClient::class.
$container->alias(ClientInterface::class, RestClient::class);

Service Extensions

Registering a service extension on the container.

/**
 * @implements ExtensionInterface<GitHubClient>
 */
final readonly class GitHubExtension implements ExtensionInterface
{
    /**
     * @param GitHubClient $service
     */
    public function __invoke(ContainerInterface $container, object $service): void
    {
        $service->setEnterpriseUrl(
            $container->get(GitHubClient::GITHUB_HOST)
        );
    }
}

$container->alias(GitHubClientInterface::class, GitHubClient::class);
$container->extend(GitHubClientInterface::class, GitHubExtention::class);

Service Factory

Registering a service factory on the container.

final readonly class Dependency {}
final readonly class Service
{
    public function __construct(
        private Dependency $dependency
    ){}

    public function dependency():Dependency
    {
        return $this->dependency;
    }
}
final readonly class ServiceFactory {
  public function __invoke(Container $container): Service
  {
     return new Service($container->get(Dependency::class));
  }
}

$container = Container::getInstance();

$container->factory(Service::class, ServiceFactory::class);

$service = $container->get(Service::class);

assert($service instanceof Service); // true
assert($service->dependency() instanceof Dependency); // true

Testing

composer test

Changelog

Please see CHANGELOG.md for more information what has changed recently.

Security

If you discover any security related issues, please email nathanael.esayeas@protonmail.com instead of using the issue tracker.

Sponsors

[Become a GitHub Sponsor]

Credits

• Nathanael Esayeas
• All Contributors

License

The BSD-4-Clause. Please see License File for more information.