src/Rbac/DbManager.php
protected function checkAccessFromCache($user, $itemName, $params, $assignments)
    {
        if (!isset($this->items[$itemName])) {
            return reject(new Error("Check access from cache - denied"));
        }

        $item = $this->items[$itemName];

        Reaction::debug($item instanceof Role ? "Checking role: $itemName" : "Checking permission: $itemName");

        return $this->executeRule($user, $item, $params)
            ->then(function() use (&$assignments, $itemName, $user, $params) {
                if (isset($assignments[$itemName]) || in_array($itemName, $this->defaultRoles)) {
                    return true;
                }

                if (!empty($this->parents[$itemName])) {
                    $promises = [];
                    foreach ($this->parents[$itemName] as $parent) {
                        $promises[] = $this->checkAccessFromCache($user, $parent, $params, $assignments);
                    }
                    return any($promises)->then(function() { return true; });
                }
                return reject(new Error("Check access from cache - denied"));
            });
    }
protected function checkAccessFromCache($user, $itemName, $params, $assignments)
    {
        if (!isset($this->items[$itemName])) {
            return reject(new Error("Check access from cache - denied"));
        }

        $item = $this->items[$itemName];

        Reaction::debug($item instanceof Role ? "Checking role: $itemName" : "Checking permission: $itemName");

        return $this->executeRule($user, $item, $params)
            ->then(function() use (&$assignments, $itemName, $user, $params) {
                if (isset($assignments[$itemName]) || in_array($itemName, $this->defaultRoles)) {
                    return true;
                }

                if (!empty($this->parents[$itemName])) {
                    $promises = [];
                    foreach ($this->parents[$itemName] as $parent) {
                        $promises[] = $this->checkAccessFromCache($user, $parent, $params, $assignments);
                    }
                    return any($promises)->then(function() { return true; });
                }
                return reject(new Error("Check access from cache - denied"));
            });
    }
Performs access check for the specified user based on the data loaded from cache.
This method is internally called by [[checkAccess()]] when [[cache]] is enabled.
@param string|int $user the user ID. This should can be either an integer or a string representing
the unique identifier of a user. See [[\yii\web\User::id]].
@param string $itemName the name of the operation that need access check
@param array $params name-value pairs that would be passed to rules associated
with the tasks and roles assigned to the user. A param with name 'user' is added to this array,
which holds the value of `$userId`.
@param Assignment[] $assignments the assignments to the specified user
@return ExtendedPromiseInterface with bool whether the operations can be performed by the user.