The ChainableGapEventHandler enables chaining together Gap::EventHandlers so separate parts of an application can be notified of Gap events as needed. The application can register multiple Gap::EventHandler objects to one ChainableGapEventHandler and then set the global Gap::EventHandler to the ChainableGapEventHandler. All registered EventHandlers will then be called when a Gap Event occurs.
Common functionality has been split off into a generic ChainableEventHandler for use by other EventHandler implementations. The ChainableEventHandler is essentially singly-linked list that propagates callbacks to all objects in the list.
The ChainableGattServerEventHandler enables chaining together GattServer::EventHandlers. An application can register separate event handlers (eg: for different services that need to handle GattServer events) and then set the global GattServer::setEventHandler to the instance of ChainableGattServerEventHandler with all registered GattServer::EventHandlers.
George Beckstein