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<?php |
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namespace FluentBooking\Framework\Http; |
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|
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/** |
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* Route group with deferred, destructor-driven registration. |
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* |
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* The group callback runs from __destruct, NOT from the constructor. |
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* This is a deliberate design decision: it lets the caller chain |
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* configuration onto the group before the callback executes: |
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* |
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* $router->group($attrs, $cb)->withPolicy(...); |
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* // The callback runs here — when the statement's temporary is |
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* // destroyed, after the whole chain has been applied. |
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* |
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* The group owns its attributes. It captures the enclosing group's |
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* attributes plus its own at creation time, and every call chained |
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* after group() is absorbed into that set. When the callback finally |
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* runs, the router activates exactly this set as the context, then |
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* restores the previous one. So the routes a group declares come |
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* out the same whether the callback runs at end of statement or |
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* later from registerRoutes(), at any nesting depth, and whether or |
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* not a sibling group was executed in between. |
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* |
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* INVARIANT: the caller's expression should stay the only strong |
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* reference to a Group. A second strong reference — or a reference |
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* cycle — defers destruction to PHP's cyclic GC, whose timing varies |
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* per host (zend.enable_gc, loaded extensions, allocation churn). |
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* Two safety nets back the invariant: the router tracks every group |
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* as a WeakReference (so tracking never extends a group's lifetime), |
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* and registerRoutes() flushes any still-pending group before routes |
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* are handed to WordPress, while the $executed flag keeps execute() |
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* idempotent so the destructor and the flush can never run a |
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* callback twice (see the fluentform 6.2.x incident). |
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* |
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* Do NOT "simplify" this by executing the callback in the |
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* constructor: the constructor runs before the chain, so every |
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* chained configuration would be silently ignored. |
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*/ |
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class Group |
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{ |
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protected $router = null; |
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protected $callback = null; |
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protected $attributes = []; |
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protected $executed = false; |
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|
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public function __construct($router, $callback, array $attributes = []) |
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{ |
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$this->router = $router; |
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$this->callback = $callback; |
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$this->attributes = $attributes; |
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$this->router->trackGroup($this); |
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} |
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|
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/** |
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* Forward chained configuration to the router, then claim |
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* whatever it staged as this group's own attributes. |
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*/ |
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public function __call($method, $params) |
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{ |
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$this->router->{$method}(...$params); |
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|
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$this->attributes = $this->router->absorbStaged($this->attributes); |
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|
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return $this; |
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} |
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|
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public function getAttributes() |
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{ |
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return $this->attributes; |
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} |
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|
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public function execute() |
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{ |
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if (!$this->executed) { |
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$this->executed = true; |
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$this->router->executeGroupCallback( |
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$this->callback, $this->attributes |
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); |
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} |
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} |
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|
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public function __destruct() |
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{ |
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$this->execute(); |
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} |
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} |
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|
