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At the root of the class hierarchy is the class StateManager. StateManager is responsible for object activation and deactivation, as well as object recovery. Refer to Example 1.1, “Statemanager� for the simplified signature of the class. Example 1.1. Statemanager public abstract class StateManager { public boolean activate (); public boolean deactivate (boolean commit); public Uid get_uid (); // object’s identifier. // methods to be provided by a derived class public boolean restore_state (InputObjectState os); public boolean save_state (OutputObjectState os); protected StateManager (); protected StateManager (Uid id); };