virtual BufferInfo getBufferInfo(UserId user, const BufferId &bufferId);
virtual QList<BufferInfo> requestBuffers(UserId user, QDateTime since = QDateTime());
virtual bool removeBuffer(const UserId &user, const BufferId &bufferId);
virtual BufferInfo getBufferInfo(UserId user, const BufferId &bufferId);
virtual QList<BufferInfo> requestBuffers(UserId user, QDateTime since = QDateTime());
virtual bool removeBuffer(const UserId &user, const BufferId &bufferId);