void requestBacklog(BufferId bufferId);
void messagesReceived(BufferId bufferId, int count);
void buffersPermanentlyMerged(BufferId bufferId1, BufferId bufferId2);
void requestBacklog(BufferId bufferId);
void messagesReceived(BufferId bufferId, int count);
void buffersPermanentlyMerged(BufferId bufferId1, BufferId bufferId2);