```
@BusinessFacade
public interface ISyncBF
```
Business facade for synchronizing data asynchronous from an engine to a client system.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`AcknowledgeEventsResponseDTO`	`acknowledgeEvents(AcknowledgeEventsRequestDTO request)`	Acknowledge events got with `getNotAcknowledgedEvents(SyncEventsRequestDTO)`. Since XNSG 4.0, Nov.
`SyncEventsResponseDTO`	`getNotAcknowledgedEvents(SyncEventsRequestDTO request)`	Poll any not acknowledged events for the client system. This method does not require, that the client system fills `SyncEventsRequestDTO.syncId`. However, it requires, that a call to `acknowledgeEvents(AcknowledgeEventsRequestDTO)` is done for acknowledge of the events. Since XNSG 4.0, Nov.
`SyncEventsResponseDTO`	`synchronizeEvents(SyncEventsRequestDTO request)`	Poll the next events for the client system. This method requires the client system to persist the synchronisation state itself and passing a proper value for `SyncEventsRequestDTO.syncId` See `getNotAcknowledgedEvents(SyncEventsRequestDTO)` for a version of the method, were the syncronisation state is kept within the Engine.

Interface ISyncBF