Examples of com.cloud.utils.db.Transaction.start()

com.cloud.utils.db.Transaction.start()

                        scanLock.unlock();
                        return;
                    }
                    Transaction txn = Transaction.open(Transaction.CLOUD_DB);
                    try {
                        txn.start();
                        //get all stats with delta > 0
                        List<UserStatisticsVO> updatedStats = _statsDao.listUpdatedStats();
                        Date updatedTime = new Date();
                        for(UserStatisticsVO stat : updatedStats){
                            //update agg bytes

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        User user = _userDao.findById(userId);
        Account account = UserContext.current().getCaller();
        StoragePoolVO primaryStorage = null;
        try {
            Transaction txn = Transaction.currentTxn();
            txn.start();
            // 1. Get the primary storage record and perform validation check
            primaryStorage = _storagePoolDao.lockRow(primaryStorageId, true);


            if (primaryStorage == null) {
                String msg = "Unable to obtain lock on the storage pool in cancelPrimaryStorageForMaintenance()";

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    }


    @DB
    public boolean migrateVolumes(List<Volume> volumes, StoragePool destPool) throws ConcurrentOperationException {
        Transaction txn = Transaction.currentTxn();
        txn.start();


        boolean transitResult = false;
        long checkPointTaskId = -1;
        try {
            List<Long> volIds = new ArrayList<Long>();

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                }
                _checkPointMgr.popCheckPoint(checkPointTaskId);
            } else {
                // Need a transaction, make sure all the volumes get migrated to new storage pool
                txn = Transaction.currentTxn();
                txn.start();


                transitResult = false;
                try {
                    for (int i = 0; i < volumes.size(); i++) {
                        CopyVolumeAnswer answer = answers.get(i);

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    }


    @DB
    protected VolumeVO switchVolume(VolumeVO existingVolume, VirtualMachineProfile<? extends VirtualMachine> vm) throws StorageUnavailableException {
        Transaction txn = Transaction.currentTxn();
        txn.start();
        try {
            stateTransitTo(existingVolume, Volume.Event.DestroyRequested);
        } catch (NoTransitionException e) {
            s_logger.debug("Unable to destroy existing volume: " + e.toString());
        }

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            s_logger.debug("Cleaning storage for vm: " + vmId);
        }
        List<VolumeVO> volumesForVm = _volsDao.findByInstance(vmId);
        List<VolumeVO> toBeExpunged = new ArrayList<VolumeVO>();
        Transaction txn = Transaction.currentTxn();
        txn.start();
        for (VolumeVO vol : volumesForVm) {
            if (vol.getVolumeType().equals(Type.ROOT)) {
                // This check is for VM in Error state (volume is already destroyed)
                if (!vol.getState().equals(Volume.State.Destroy)) {
                    destroyVolume(vol);

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    @DB
    public void processStopOrRebootAnswer(final DomainRouterVO router, Answer answer) {
        final Transaction txn = Transaction.currentTxn();
        try {
            txn.start();
            //FIXME!!! - UserStats command should grab bytesSent/Received for all guest interfaces of the VR
            List<Long> routerGuestNtwkIds = _routerDao.getRouterNetworks(router.getId());
            for (Long guestNtwkId : routerGuestNtwkIds) {
                final UserStatisticsVO userStats = _userStatsDao.lock(router.getAccountId(), router.getDataCenterIdToDeployIn(),
                        guestNtwkId, null, router.getId(), router.getType().toString());

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                }
            }
            if (updated) {
                Transaction txn = Transaction.open(Transaction.CLOUD_DB);
                try {
                    txn.start();
                    _routerDao.update(router.getId(), router);
                    txn.commit();
                } catch (Exception e) {
                    txn.rollback();
                    s_logger.warn("Unable to update router status for account: " + router.getAccountId());

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                        try {
                            if ((answer.getBytesReceived() == 0) && (answer.getBytesSent() == 0)) {
                                s_logger.debug("Recieved and Sent bytes are both 0. Not updating user_statistics");
                                continue;
                            }
                            txn.start();
                            UserStatisticsVO stats = _statsDao.lock(router.getAccountId(), 
                                    router.getDataCenterIdToDeployIn(), network.getId(), null, router.getId(), router.getType().toString());
                            if (stats == null) {
                                s_logger.warn("unable to find stats for account: " + router.getAccountId());
                                continue;

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    public PublicIp fetchNewPublicIp(long dcId, Long podId, Long vlanDbId, Account owner, VlanType vlanUse, 
            Long guestNetworkId, boolean sourceNat, boolean assign, String requestedIp, boolean isSystem, Long vpcId)
            throws InsufficientAddressCapacityException {
        StringBuilder errorMessage = new StringBuilder("Unable to get ip adress in ");
        Transaction txn = Transaction.currentTxn();
        txn.start();
        SearchCriteria<IPAddressVO> sc = null;
        if (podId != null) {
            sc = AssignIpAddressFromPodVlanSearch.create();
            sc.setJoinParameters("podVlanMapSB", "podId", podId);
            errorMessage.append(" pod id=" + podId);

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