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

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

            }
            NetworkGuru guru = _networkGurus.get(network.getGuruName());
            Account owner = _accountMgr.getAccount(network.getAccountId());


            Transaction txn = Transaction.currentTxn();
            txn.start();
            guru.trash(network, _networkOfferingDao.findById(network.getNetworkOfferingId()), owner);


            if (!deleteVlansInNetwork(network.getId(), context.getCaller().getId(), callerAccount)) {
                success = false;
                s_logger.warn("Failed to delete network " + network + "; was unable to cleanup corresponding ip ranges");

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        if (guestNetwork != null && guestNetwork.getTrafficType() != TrafficType.Guest) {
            throw new InvalidParameterValueException("Network " + guestNetwork + " is not of a type " + TrafficType.Guest);
        }


        Transaction txn = Transaction.currentTxn();
        txn.start();


        if (guestNetwork == null) {
            List<? extends Network> networks = getIsolatedNetworksWithSourceNATOwnedByAccountInZone(zoneId, owner);
            if (networks.size() == 0) {
                createNetwork = true;

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            s_logger.trace("Ip address id=" + addrId + " is already released");
            return ip;
        }


        if (ip.getState() != State.Releasing) {
            txn.start();


            // don't decrement resource count for direct ips
            if (ip.getAssociatedWithNetworkId() != null) {
                _resourceLimitMgr.decrementResourceCount(_ipAddressDao.findById(addrId).getAllocatedToAccountId(), ResourceType.public_ip);
            }

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        }


        if (networkOfferingId != null) {
            if (networkOfferingChanged) {
                Transaction txn = Transaction.currentTxn();
                txn.start();
                network.setNetworkOfferingId(networkOfferingId);
                _networksDao.update(networkId, network, newSvcProviders);
                // get all nics using this network
                // log remove usage events for old offering
                // log assign usage events for new offering

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            Pair<NetworkVO, NicProfile> profile = new Pair<NetworkVO, NicProfile>(network, null);
            List<Pair<NetworkVO, NicProfile>> profiles = new ArrayList<Pair<NetworkVO, NicProfile>>();
            profiles.add(profile);


            Transaction txn = Transaction.currentTxn();
            txn.start();


            try {
                this.cleanupNics(vm);
                this.allocate(vm, profiles);
            } finally {

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            }
        }


        Transaction txn = Transaction.currentTxn();
        try {
            txn.start();
            // Create the new physical network in the database
            long id = _physicalNetworkDao.getNextInSequence(Long.class, "id");
            PhysicalNetworkVO pNetwork = new PhysicalNetworkVO(id, zoneId, vnetRange, networkSpeed, domainId, broadcastDomainRange, name);
            pNetwork.setTags(tags);
            pNetwork.setIsolationMethods(isolationMethods);

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        }


        checkIfPhysicalNetworkIsDeletable(physicalNetworkId);


        Transaction txn = Transaction.currentTxn();
        txn.start();
        // delete vlans for this zone
        List<VlanVO> vlans = _vlanDao.listVlansByPhysicalNetworkId(physicalNetworkId);
        for (VlanVO vlan : vlans) {
            _vlanDao.remove(vlan.getId());
        }

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            services = new ArrayList<Service>(element.getCapabilities().keySet());
        }


        Transaction txn = Transaction.currentTxn();
        try {
            txn.start();
            // Create the new physical network in the database
            PhysicalNetworkServiceProviderVO nsp = new PhysicalNetworkServiceProviderVO(physicalNetworkId, providerName);
            // set enabled services
            nsp.setEnabledServices(services);

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            }
        }


        Transaction txn = Transaction.currentTxn();
        try {
            txn.start();
            // Create the new traffic type in the database
            if (xenLabel == null) {
                xenLabel = getDefaultXenNetworkLabel(trafficType);
            }
            PhysicalNetworkTrafficTypeVO pNetworktrafficType = new PhysicalNetworkTrafficTypeVO(physicalNetworkId, trafficType, xenLabel, kvmLabel, vmwareLabel, simulatorLabel, vlan);

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        cidr = NetUtils.ipAndNetMaskToCidr(gateway, netmask);
        
        
        Transaction txn = Transaction.currentTxn();
        txn.start();
        
        //lock datacenter as we need to get mac address seq from there
        DataCenterVO dc = _dcDao.lockRow(pNtwk.getDataCenterId(), true);
        
        //check if we need to create guest network

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