@Override
protected void perform() {
// Generate the ticket if needed (in some situations the client will not send
// a ticket):
if (StringUtils.isEmpty(ticket)) {
ticket = Ticketing.generateOTP();
}
// Update the dynamic information of the virtual machine in memory (we need it
// to update the database later):
final VM vm = getVm();
final DbUser user = getCurrentUser();
vm.setConsoleUserId(user.getId());
vm.setConsoleCurrentUserName(getConsoleUserName());
// If the virtual machine has the allow reconnect flag or the user
// needed additional permissions to connect to the console then we just
// have to save the user id to the database, regardless of what was
// there before and without locking.
//
// Note that the fact that the user needed permissions actually means
// that it has them, otherwise we will not be here, performing the
// operation.
//
// In any other situation we try to save the new user to the database
// and proceed only if the previous user in the database is null. This
// is needed to prevent races between different users trying to access
// the console of the same virtual machine simultaneously.
final VmDynamicDao dao = DbFacade.getInstance().getVmDynamicDao();
if (vm.getAllowConsoleReconnect() || neededPermissions) {
dao.update(vm.getDynamicData());
sendTicket();
} else {
final boolean saved = dao.updateConsoleUserWithOptimisticLocking(vm.getDynamicData());
if (saved) {
sendTicket();
} else {
dontSendTicket();
}
}
}
private boolean isVmRunningOnHost(Guid hostId) {
return !vmDynamicDao.getAllRunningForVds(hostId).isEmpty();
}