+ virtual BufferInfo getBufferInfo(UserId user, const BufferId &bufferId);
+ virtual QList<BufferInfo> requestBuffers(UserId user);
+ virtual QList<BufferId> requestBufferIdsForNetwork(UserId user, NetworkId networkId);
+ virtual bool removeBuffer(const UserId &user, const BufferId &bufferId);
+ virtual BufferId renameBuffer(const UserId &user, const NetworkId &networkId, const QString &newName, const QString &oldName);
+ virtual void setBufferLastSeenMsg(UserId user, const BufferId &bufferId, const MsgId &msgId);
+ virtual QHash<BufferId, MsgId> bufferLastSeenMsgIds(UserId user);