More documentation on application middleware.

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src/controllers.php

@@ -42,13 +42,30 @@ $app['mwBeforeAll'] = function () { return new BeforeAll(); };
 // This type of global configuration does not apply to mounted controllers,
 // which have their own "global" configuration.
 
-// Normal service with a method call. "Before": Triggered on KE::REQUEST.
-$app->before('mwBeforeAll:next');
-// Callable service. "After": triggered on KE::RESPONSE.
+/* ---- Application middleware -------------------------------------------------
+Middleware is invoked as event subscribers on KernelEvents with a priority.
+
+Predefined priorities:
+ - default == 0
+ - Application::EARLY_EVENT == 512
+ - Application::LATE_EVENT == -512.
+*/
+
+// Usual service example with a method call.
+// "Before": triggered on KernelEvents::REQUEST.
+// Early before() middleware runs before routing and security, which can be
+// necessary to have it run even on 403/404 exceptions.
+$app->before('mwBeforeAll:next', $priority = 0);
+
+// Callable service example.
+// "After": triggered on KernelEvents::RESPONSE.
 $app->after('mwAfterAll');
-// Plain callable. "Finish": triggered on KE::TERMINATE.
+
+// Plain callable example.
+// "Finish": triggered on KernelEvents::TERMINATE.
 $app->finish([Finish::class, 'handle']);
 
+// ---- Routing ----------------------------------------------------------------
 // Demo Twig.
 $app->get('/',                  HomeController::class       . '::home')
   ->bind('homepage');
@@ -90,18 +107,24 @@ $app->get('err/base',           ErrorController::class      . '::errorBase');
 $app->get('/user/{user}',       UserController::class       . '::itemAction')
   ->convert('user', 'converter.user:convert');
 
-// Register a view handler. They can also receive Request $request as 2nd arg,
-// e.g. for basic content negotiation. But the callback_resolver service:
-// - can not receive $app
-// - unlike the controller_resolver, can only use standard callables/services
-// - unlike the exception listener, can not use _invoke-able class names.
-// So one way to get the app is to use it as a global (!).
-// They are triggered on KE::VIEW.
+/* ---- View handlers ----------------------------------------------------------
+View handlers can also receive Request $request as 2nd arg e.g. for basic
+content negotiation. But the callback_resolver service:
+ - can not receive $app
+ - unlike the controller_resolver, can only use standard callables/services
+ - unlike the exception listener, can not use _invoke-able class names.
+So one way to get the app is to use it as a global (!).
+
+They are triggered on KernelEvents::VIEW.
+ */
 $app->view([JsonView::class, 'handle']);
 
-// Handlers are examined in order, and called in a chain with the result of the
-// previous one. The last one must return a string or Response.
-// They are triggered on KE::EXCEPTION.
+/* ---- Exception handlers -----------------------------------------------------
+Handlers are examined in order, and called in a chain with the result of the
+previous one. The last one must return a string or Response.
+
+They are triggered on KernelEvents::EXCEPTION.
+ */
 $app->error([HttpErrorHandler::class, 'handle']);
 // Handlers do not receive $app, so they have to be closures or instantiated
 // here if they need it (or use the global $app like view handlers.