# Restrictions

Restrictions are control mechanisms used to determine whether a user has access to the elevator or specific floors within the elevator system. These controls are flexible, stackable, and must return a boolean value (`true` or `false`) to the controller. Depending on the type of restriction applied, access can be restricted at the elevator level or limited to certain floors.

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#### Return Value Requirement

Restriction must return a **boolean value** (`true` or `false`):

* `true` → Access granted.
* `false` → Access denied.
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Restriction checks are cached for 5 seconds, ensuring the system doesn't repeatedly evaluate the same conditions.
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#### Summary of Restriction Logic

| Restriction Type         | Scope                           | Behavior                                   |
| ------------------------ | ------------------------------- | ------------------------------------------ |
| **Elevator Restriction** | Entire elevator system          | Disables all floors if `false` is returned |
| **Floor Restriction**    | Specific floors of the elevator | Disables only the specified floors         |