PSR-15 Middleware Integration

FastForward Defer provides PSR-15 middleware for request-scoped deferred execution.

use FastForward\Defer\Middleware\DeferMiddleware;
// Default attribute is DeferInterface::class
$middleware = new DeferMiddleware();
// Or customize the attribute name:
$middleware = new DeferMiddleware('custom.defer');
$response = $middleware->process($request, $handler);

The middleware:

• Creates a Defer instance per request
• Injects it into request attributes (default: DeferInterface::class, or custom via $attribute)
• Ensures execution at the end of the request

You MAY access the Defer instance in handlers via:

use FastForward\Defer\DeferInterface;
// Default:
$defer = $request->getAttribute(DeferInterface::class);
// If using a custom attribute:
$defer = $request->getAttribute('custom.defer');
$defer(fn() => cleanup());