| Piwik\Updater\Migration |
| Name | Description |
|---|---|
| Migration | Base class for migrations. Any migration must extend this class. |
| UpdateObserver | UpdateObservers can be used to inject logic into the component updating process. Derive from this base class and add an instance of the derived class to a Updater instance. When Updater::update() is called, the methods in the added UpdateListeners will be executed accordingly. |