Q_ASSERT(!_bufferSyncer);
_bufferSyncer = new BufferSyncer(this);
connect(bufferSyncer(), SIGNAL(lastSeenSet(BufferId, const QDateTime &)), this, SLOT(updateLastSeen(BufferId, const QDateTime &)));
Q_ASSERT(!_bufferSyncer);
_bufferSyncer = new BufferSyncer(this);
connect(bufferSyncer(), SIGNAL(lastSeenSet(BufferId, const QDateTime &)), this, SLOT(updateLastSeen(BufferId, const QDateTime &)));