Examples with DownloadProgressCommand org.apache.cloudstack.storage.command.DownloadProgressCommand used on opensource projects

Example 1 with DownloadProgressCommand

use of org.apache.cloudstack.storage.command.DownloadProgressCommand in project cloudstack by apache.

the class DownloadListener method sendCommand.

public void sendCommand(RequestType reqType) {
    if (getJobId() != null) {
        if (s_logger.isTraceEnabled()) {
            log("Sending progress command ", Level.TRACE);
        }
        try {
            DownloadProgressCommand dcmd = new DownloadProgressCommand(getCommand(), getJobId(), reqType);
            if (object.getType() == DataObjectType.VOLUME) {
                dcmd.setResourceType(ResourceType.VOLUME);
            }
            _ssAgent.sendMessageAsync(dcmd, new UploadListener.Callback(_ssAgent.getId(), this));
        } catch (Exception e) {
            s_logger.debug("Send command failed", e);
            setDisconnected();
        }
    }
}

Example 2 with DownloadProgressCommand

use of org.apache.cloudstack.storage.command.DownloadProgressCommand in project cloudstack by apache.

the class DownloadMonitorImpl method downloadVolumeToStorage.

@Override
public void downloadVolumeToStorage(DataObject volume, AsyncCompletionCallback<DownloadAnswer> callback) {
    boolean downloadJobExists = false;
    VolumeDataStoreVO volumeHost;
    DataStore store = volume.getDataStore();
    VolumeInfo volInfo = (VolumeInfo) volume;
    RegisterVolumePayload payload = (RegisterVolumePayload) volInfo.getpayload();
    String url = payload.getUrl();
    String checkSum = payload.getChecksum();
    ImageFormat format = ImageFormat.valueOf(payload.getFormat());
    volumeHost = _volumeStoreDao.findByStoreVolume(store.getId(), volume.getId());
    if (volumeHost == null) {
        volumeHost = new VolumeDataStoreVO(store.getId(), volume.getId(), new Date(), 0, Status.NOT_DOWNLOADED, null, null, "jobid0000", null, url, checkSum);
        volumeHost = _volumeStoreDao.persist(volumeHost);
    } else if ((volumeHost.getJobId() != null) && (volumeHost.getJobId().length() > 2)) {
        downloadJobExists = true;
    } else {
        // persit url and checksum
        volumeHost.setDownloadUrl(url);
        volumeHost.setChecksum(checkSum);
        _volumeStoreDao.update(volumeHost.getId(), volumeHost);
    }
    Long maxVolumeSizeInBytes = getMaxVolumeSizeInBytes();
    start();
    DownloadCommand dcmd = new DownloadCommand((VolumeObjectTO) (volume.getTO()), maxVolumeSizeInBytes, checkSum, url, format);
    dcmd.setProxy(getHttpProxy());
    if (downloadJobExists) {
        dcmd = new DownloadProgressCommand(dcmd, volumeHost.getJobId(), RequestType.GET_OR_RESTART);
        dcmd.setResourceType(ResourceType.VOLUME);
    }
    EndPoint ep = _epSelector.select(volume);
    if (ep == null) {
        LOGGER.warn("There is no secondary storage VM for image store " + store.getName());
        return;
    }
    DownloadListener dl = new DownloadListener(ep, store, volume, _timer, this, dcmd, callback);
    // auto-wired those injected fields in DownloadListener
    ComponentContext.inject(dl);
    if (downloadJobExists) {
        dl.setCurrState(volumeHost.getDownloadState());
    }
    try {
        ep.sendMessageAsync(dcmd, new UploadListener.Callback(ep.getId(), dl));
    } catch (Exception e) {
        LOGGER.warn("Unable to start /resume download of volume " + volume.getId() + " to " + store.getName(), e);
        dl.setDisconnected();
        dl.scheduleStatusCheck(RequestType.GET_OR_RESTART);
    }
}

Example 3 with DownloadProgressCommand

use of org.apache.cloudstack.storage.command.DownloadProgressCommand in project cloudstack by apache.

the class DownloadManagerImpl method handleDownloadCommand.

@Override
public DownloadAnswer handleDownloadCommand(SecondaryStorageResource resource, DownloadCommand cmd) {
    int timeout = NumbersUtil.parseInt(cmd.getContextParam("vmware.package.ova.timeout"), 3600000);
    this._processTimeout = timeout;
    ResourceType resourceType = cmd.getResourceType();
    if (cmd instanceof DownloadProgressCommand) {
        return handleDownloadProgressCmd(resource, (DownloadProgressCommand) cmd);
    }
    if (cmd.getUrl() == null) {
        return new DownloadAnswer(resourceType.toString() + " is corrupted on storage due to an invalid url , cannot download", VMTemplateStorageResourceAssoc.Status.DOWNLOAD_ERROR);
    }
    if (cmd.getName() == null) {
        return new DownloadAnswer("Invalid Name", VMTemplateStorageResourceAssoc.Status.DOWNLOAD_ERROR);
    }
    if (!DigestHelper.isAlgorithmSupported(cmd.getChecksum())) {
        return new DownloadAnswer("invalid algorithm: " + cmd.getChecksum(), VMTemplateStorageResourceAssoc.Status.NOT_DOWNLOADED);
    }
    DataStoreTO dstore = cmd.getDataStore();
    String installPathPrefix = cmd.getInstallPath();
    // for NFS, we need to get mounted path
    if (dstore instanceof NfsTO) {
        installPathPrefix = resource.getRootDir(((NfsTO) dstore).getUrl(), _nfsVersion) + File.separator + installPathPrefix;
    }
    String user = null;
    String password = null;
    if (cmd.getAuth() != null) {
        user = cmd.getAuth().getUserName();
        password = cmd.getAuth().getPassword();
    }
    // TO DO - Define Volume max size as well
    long maxDownloadSizeInBytes = (cmd.getMaxDownloadSizeInBytes() == null) ? TemplateDownloader.DEFAULT_MAX_TEMPLATE_SIZE_IN_BYTES : (cmd.getMaxDownloadSizeInBytes());
    String jobId = null;
    if (dstore instanceof S3TO) {
        jobId = downloadS3Template((S3TO) dstore, cmd.getId(), cmd.getUrl(), cmd.getName(), cmd.getFormat(), cmd.isHvm(), cmd.getAccountId(), cmd.getDescription(), cmd.getChecksum(), installPathPrefix, user, password, maxDownloadSizeInBytes, cmd.getProxy(), resourceType);
    } else {
        jobId = downloadPublicTemplate(cmd.getId(), cmd.getUrl(), cmd.getName(), cmd.getFormat(), cmd.isHvm(), cmd.getAccountId(), cmd.getDescription(), cmd.getChecksum(), installPathPrefix, cmd.getInstallPath(), user, password, maxDownloadSizeInBytes, cmd.getProxy(), resourceType);
    }
    sleep();
    if (jobId == null) {
        return new DownloadAnswer("Internal Error", VMTemplateStorageResourceAssoc.Status.DOWNLOAD_ERROR);
    }
    return new DownloadAnswer(jobId, getDownloadPct(jobId), getDownloadError(jobId), getDownloadStatus2(jobId), getDownloadLocalPath(jobId), getInstallPath(jobId), getDownloadTemplateSize(jobId), getDownloadTemplateSize(jobId), getDownloadCheckSum(jobId));
}

Example 4 with DownloadProgressCommand

use of org.apache.cloudstack.storage.command.DownloadProgressCommand in project cloudstack by apache.

the class SimulatorManagerImpl method simulate.

@DB
@Override
public Answer simulate(final Command cmd, final String hostGuid) {
    s_logger.debug("Simulate command " + cmd);
    Answer answer = null;
    Exception exception = null;
    TransactionLegacy txn = TransactionLegacy.open(TransactionLegacy.SIMULATOR_DB);
    try {
        final MockHost host = _mockHost.findByGuid(hostGuid);
        String cmdName = cmd.toString();
        final int index = cmdName.lastIndexOf(".");
        if (index != -1) {
            cmdName = cmdName.substring(index + 1);
        }
        final SimulatorInfo info = new SimulatorInfo();
        info.setHostUuid(hostGuid);
        final MockConfigurationVO config = _mockConfigDao.findByNameBottomUP(host.getDataCenterId(), host.getPodId(), host.getClusterId(), host.getId(), cmdName);
        if (config != null && (config.getCount() == null || config.getCount().intValue() > 0)) {
            final Map<String, String> configParameters = config.getParameters();
            for (final Map.Entry<String, String> entry : configParameters.entrySet()) {
                if (entry.getKey().equalsIgnoreCase("enabled")) {
                    info.setEnabled(Boolean.parseBoolean(entry.getValue()));
                } else if (entry.getKey().equalsIgnoreCase("timeout")) {
                    try {
                        info.setTimeout(Integer.valueOf(entry.getValue()));
                    } catch (final NumberFormatException e) {
                        s_logger.debug("invalid timeout parameter: " + e.toString());
                    }
                }
                if (entry.getKey().equalsIgnoreCase("wait")) {
                    try {
                        final int wait = Integer.valueOf(entry.getValue());
                        Thread.sleep(wait);
                    } catch (final NumberFormatException e) {
                        s_logger.debug("invalid wait parameter: " + e.toString());
                    } catch (final InterruptedException e) {
                        s_logger.debug("thread is interrupted: " + e.toString());
                    }
                }
                if (entry.getKey().equalsIgnoreCase("result")) {
                    final String value = entry.getValue();
                    if (value.equalsIgnoreCase("fail")) {
                        answer = new Answer(cmd, false, "Simulated failure");
                    } else if (value.equalsIgnoreCase("fault")) {
                        exception = new Exception("Simulated fault");
                    }
                }
            }
            if (exception != null) {
                throw exception;
            }
            if (answer == null) {
                final String message = config.getJsonResponse();
                if (message != null) {
                    // json response looks like {"<Type>":....}
                    final String objectType = message.split(":")[0].substring(2).replace("\"", "");
                    final String objectData = message.substring(message.indexOf(':') + 1, message.length() - 1);
                    if (objectType != null) {
                        Class<?> clz = null;
                        try {
                            clz = Class.forName(objectType);
                        } catch (final ClassNotFoundException e) {
                        }
                        if (clz != null) {
                            final StringReader reader = new StringReader(objectData);
                            final JsonReader jsonReader = new JsonReader(reader);
                            jsonReader.setLenient(true);
                            answer = (Answer) s_gson.fromJson(jsonReader, clz);
                        }
                    }
                }
            }
        }
        if (answer == null) {
            if (cmd instanceof GetHostStatsCommand) {
                answer = _mockAgentMgr.getHostStatistic((GetHostStatsCommand) cmd);
            } else if (cmd instanceof CheckHealthCommand) {
                answer = _mockAgentMgr.checkHealth((CheckHealthCommand) cmd);
            } else if (cmd instanceof PingTestCommand) {
                answer = _mockAgentMgr.pingTest((PingTestCommand) cmd);
            } else if (cmd instanceof SetupKeyStoreCommand) {
                answer = _mockAgentMgr.setupKeyStore((SetupKeyStoreCommand) cmd);
            } else if (cmd instanceof DiagnosticsCommand) {
                answer = _mockAgentMgr.runDiagnostics((DiagnosticsCommand) cmd);
            } else if (cmd instanceof SetupCertificateCommand) {
                answer = _mockAgentMgr.setupCertificate((SetupCertificateCommand) cmd);
            } else if (cmd instanceof PrepareForMigrationCommand) {
                answer = _mockVmMgr.prepareForMigrate((PrepareForMigrationCommand) cmd);
            } else if (cmd instanceof MigrateCommand) {
                answer = _mockVmMgr.migrate((MigrateCommand) cmd, info);
            } else if (cmd instanceof StartCommand) {
                answer = _mockVmMgr.startVM((StartCommand) cmd, info);
            } else if (cmd instanceof CheckSshCommand) {
                answer = _mockVmMgr.checkSshCommand((CheckSshCommand) cmd);
            } else if (cmd instanceof CheckVirtualMachineCommand) {
                answer = _mockVmMgr.checkVmState((CheckVirtualMachineCommand) cmd);
            } else if (cmd instanceof SetStaticNatRulesCommand) {
                answer = _mockNetworkMgr.SetStaticNatRules((SetStaticNatRulesCommand) cmd);
            } else if (cmd instanceof SetFirewallRulesCommand) {
                answer = _mockNetworkMgr.SetFirewallRules((SetFirewallRulesCommand) cmd);
            } else if (cmd instanceof SetPortForwardingRulesCommand) {
                answer = _mockNetworkMgr.SetPortForwardingRules((SetPortForwardingRulesCommand) cmd);
            } else if (cmd instanceof NetworkUsageCommand) {
                answer = _mockNetworkMgr.getNetworkUsage((NetworkUsageCommand) cmd);
            } else if (cmd instanceof IpAssocCommand) {
                answer = _mockNetworkMgr.IpAssoc((IpAssocCommand) cmd);
            } else if (cmd instanceof LoadBalancerConfigCommand) {
                answer = _mockNetworkMgr.LoadBalancerConfig((LoadBalancerConfigCommand) cmd);
            } else if (cmd instanceof DhcpEntryCommand) {
                answer = _mockNetworkMgr.AddDhcpEntry((DhcpEntryCommand) cmd);
            } else if (cmd instanceof VmDataCommand) {
                answer = _mockVmMgr.setVmData((VmDataCommand) cmd);
            } else if (cmd instanceof CleanupNetworkRulesCmd) {
                answer = _mockVmMgr.cleanupNetworkRules((CleanupNetworkRulesCmd) cmd, info);
            } else if (cmd instanceof CheckNetworkCommand) {
                answer = _mockAgentMgr.checkNetworkCommand((CheckNetworkCommand) cmd);
            } else if (cmd instanceof StopCommand) {
                answer = _mockVmMgr.stopVM((StopCommand) cmd);
            } else if (cmd instanceof RebootCommand) {
                answer = _mockVmMgr.rebootVM((RebootCommand) cmd);
            } else if (cmd instanceof GetVncPortCommand) {
                answer = _mockVmMgr.getVncPort((GetVncPortCommand) cmd);
            } else if (cmd instanceof CheckConsoleProxyLoadCommand) {
                answer = _mockVmMgr.checkConsoleProxyLoad((CheckConsoleProxyLoadCommand) cmd);
            } else if (cmd instanceof WatchConsoleProxyLoadCommand) {
                answer = _mockVmMgr.watchConsoleProxyLoad((WatchConsoleProxyLoadCommand) cmd);
            } else if (cmd instanceof SecurityGroupRulesCmd) {
                answer = _mockVmMgr.addSecurityGroupRules((SecurityGroupRulesCmd) cmd, info);
            } else if (cmd instanceof SavePasswordCommand) {
                answer = _mockVmMgr.savePassword((SavePasswordCommand) cmd);
            } else if (cmd instanceof PrimaryStorageDownloadCommand) {
                answer = _mockStorageMgr.primaryStorageDownload((PrimaryStorageDownloadCommand) cmd);
            } else if (cmd instanceof CreateCommand) {
                answer = _mockStorageMgr.createVolume((CreateCommand) cmd);
            } else if (cmd instanceof AttachIsoCommand) {
                answer = _mockStorageMgr.AttachIso((AttachIsoCommand) cmd);
            } else if (cmd instanceof DeleteStoragePoolCommand) {
                answer = _mockStorageMgr.DeleteStoragePool((DeleteStoragePoolCommand) cmd);
            } else if (cmd instanceof ModifyStoragePoolCommand) {
                answer = _mockStorageMgr.ModifyStoragePool((ModifyStoragePoolCommand) cmd);
            } else if (cmd instanceof CreateStoragePoolCommand) {
                answer = _mockStorageMgr.CreateStoragePool((CreateStoragePoolCommand) cmd);
            } else if (cmd instanceof SecStorageSetupCommand) {
                answer = _mockStorageMgr.SecStorageSetup((SecStorageSetupCommand) cmd);
            } else if (cmd instanceof ListTemplateCommand) {
                answer = _mockStorageMgr.ListTemplates((ListTemplateCommand) cmd);
            } else if (cmd instanceof ListVolumeCommand) {
                answer = _mockStorageMgr.ListVolumes((ListVolumeCommand) cmd);
            } else if (cmd instanceof DestroyCommand) {
                answer = _mockStorageMgr.Destroy((DestroyCommand) cmd);
            } else if (cmd instanceof DownloadProgressCommand) {
                answer = _mockStorageMgr.DownloadProcess((DownloadProgressCommand) cmd);
            } else if (cmd instanceof DownloadCommand) {
                answer = _mockStorageMgr.Download((DownloadCommand) cmd);
            } else if (cmd instanceof GetStorageStatsCommand) {
                answer = _mockStorageMgr.GetStorageStats((GetStorageStatsCommand) cmd);
            } else if (cmd instanceof GetVolumeStatsCommand) {
                answer = _mockStorageMgr.getVolumeStats((GetVolumeStatsCommand) cmd);
            } else if (cmd instanceof ManageSnapshotCommand) {
                answer = _mockStorageMgr.ManageSnapshot((ManageSnapshotCommand) cmd);
            } else if (cmd instanceof BackupSnapshotCommand) {
                answer = _mockStorageMgr.BackupSnapshot((BackupSnapshotCommand) cmd, info);
            } else if (cmd instanceof CreateVolumeFromSnapshotCommand) {
                answer = _mockStorageMgr.CreateVolumeFromSnapshot((CreateVolumeFromSnapshotCommand) cmd);
            } else if (cmd instanceof DeleteCommand) {
                answer = _mockStorageMgr.Delete((DeleteCommand) cmd);
            } else if (cmd instanceof SecStorageVMSetupCommand) {
                answer = _mockStorageMgr.SecStorageVMSetup((SecStorageVMSetupCommand) cmd);
            } else if (cmd instanceof CreatePrivateTemplateFromSnapshotCommand) {
                answer = _mockStorageMgr.CreatePrivateTemplateFromSnapshot((CreatePrivateTemplateFromSnapshotCommand) cmd);
            } else if (cmd instanceof ComputeChecksumCommand) {
                answer = _mockStorageMgr.ComputeChecksum((ComputeChecksumCommand) cmd);
            } else if (cmd instanceof CreatePrivateTemplateFromVolumeCommand) {
                answer = _mockStorageMgr.CreatePrivateTemplateFromVolume((CreatePrivateTemplateFromVolumeCommand) cmd);
            } else if (cmd instanceof UploadStatusCommand) {
                answer = _mockStorageMgr.getUploadStatus((UploadStatusCommand) cmd);
            } else if (cmd instanceof MaintainCommand) {
                answer = _mockAgentMgr.maintain((MaintainCommand) cmd);
            } else if (cmd instanceof GetVmStatsCommand) {
                answer = _mockVmMgr.getVmStats((GetVmStatsCommand) cmd);
            } else if (cmd instanceof CheckRouterCommand) {
                answer = _mockVmMgr.checkRouter((CheckRouterCommand) cmd);
            } else if (cmd instanceof GetDomRVersionCmd) {
                answer = _mockVmMgr.getDomRVersion((GetDomRVersionCmd) cmd);
            } else if (cmd instanceof CopyVolumeCommand) {
                answer = _mockStorageMgr.CopyVolume((CopyVolumeCommand) cmd);
            } else if (cmd instanceof PlugNicCommand) {
                answer = _mockNetworkMgr.plugNic((PlugNicCommand) cmd);
            } else if (cmd instanceof UnPlugNicCommand) {
                answer = _mockNetworkMgr.unplugNic((UnPlugNicCommand) cmd);
            } else if (cmd instanceof ReplugNicCommand) {
                answer = _mockNetworkMgr.replugNic((ReplugNicCommand) cmd);
            } else if (cmd instanceof IpAssocVpcCommand) {
                answer = _mockNetworkMgr.ipAssoc((IpAssocVpcCommand) cmd);
            } else if (cmd instanceof SetSourceNatCommand) {
                answer = _mockNetworkMgr.setSourceNat((SetSourceNatCommand) cmd);
            } else if (cmd instanceof SetNetworkACLCommand) {
                answer = _mockNetworkMgr.setNetworkAcl((SetNetworkACLCommand) cmd);
            } else if (cmd instanceof SetupGuestNetworkCommand) {
                answer = _mockNetworkMgr.setUpGuestNetwork((SetupGuestNetworkCommand) cmd);
            } else if (cmd instanceof SetPortForwardingRulesVpcCommand) {
                answer = _mockNetworkMgr.setVpcPortForwards((SetPortForwardingRulesVpcCommand) cmd);
            } else if (cmd instanceof SetStaticNatRulesCommand) {
                answer = _mockNetworkMgr.setVPCStaticNatRules((SetStaticNatRulesCommand) cmd);
            } else if (cmd instanceof SetStaticRouteCommand) {
                answer = _mockNetworkMgr.setStaticRoute((SetStaticRouteCommand) cmd);
            } else if (cmd instanceof Site2SiteVpnCfgCommand) {
                answer = _mockNetworkMgr.siteToSiteVpn((Site2SiteVpnCfgCommand) cmd);
            } else if (cmd instanceof CheckS2SVpnConnectionsCommand) {
                answer = _mockNetworkMgr.checkSiteToSiteVpnConnection((CheckS2SVpnConnectionsCommand) cmd);
            } else if (cmd instanceof CreateVMSnapshotCommand) {
                answer = _mockVmMgr.createVmSnapshot((CreateVMSnapshotCommand) cmd);
            } else if (cmd instanceof DeleteVMSnapshotCommand) {
                answer = _mockVmMgr.deleteVmSnapshot((DeleteVMSnapshotCommand) cmd);
            } else if (cmd instanceof RevertToVMSnapshotCommand) {
                answer = _mockVmMgr.revertVmSnapshot((RevertToVMSnapshotCommand) cmd);
            } else if (cmd instanceof NetworkRulesVmSecondaryIpCommand) {
                answer = _mockVmMgr.plugSecondaryIp((NetworkRulesVmSecondaryIpCommand) cmd);
            } else if (cmd instanceof ScaleVmCommand) {
                answer = _mockVmMgr.scaleVm((ScaleVmCommand) cmd);
            } else if (cmd instanceof PvlanSetupCommand) {
                answer = _mockNetworkMgr.setupPVLAN((PvlanSetupCommand) cmd);
            } else if (cmd instanceof StorageSubSystemCommand) {
                answer = storageHandler.handleStorageCommands((StorageSubSystemCommand) cmd);
            } else if (cmd instanceof FenceCommand) {
                answer = _mockVmMgr.fence((FenceCommand) cmd);
            } else if (cmd instanceof HandleConfigDriveIsoCommand) {
                answer = _mockStorageMgr.handleConfigDriveIso((HandleConfigDriveIsoCommand) cmd);
            } else if (cmd instanceof GetRouterAlertsCommand || cmd instanceof VpnUsersCfgCommand || cmd instanceof RemoteAccessVpnCfgCommand || cmd instanceof SetMonitorServiceCommand || cmd instanceof AggregationControlCommand || cmd instanceof SecStorageFirewallCfgCommand) {
                answer = new Answer(cmd);
            } else {
                s_logger.error("Simulator does not implement command of type " + cmd.toString());
                answer = Answer.createUnsupportedCommandAnswer(cmd);
            }
        }
        if (config != null && config.getCount() != null && config.getCount().intValue() > 0) {
            if (answer != null) {
                config.setCount(config.getCount().intValue() - 1);
                _mockConfigDao.update(config.getId(), config);
            }
        }
        s_logger.debug("Finished simulate command " + cmd);
        return answer;
    } catch (final Exception e) {
        s_logger.error("Failed execute cmd: ", e);
        txn.rollback();
        return new Answer(cmd, false, e.toString());
    } finally {
        txn.close();
        txn = TransactionLegacy.open(TransactionLegacy.CLOUD_DB);
        txn.close();
    }
}

Example 5 with DownloadProgressCommand

use of org.apache.cloudstack.storage.command.DownloadProgressCommand in project cloudstack by apache.

the class DownloadMonitorImpl method initiateTemplateDownload.

private void initiateTemplateDownload(DataObject template, AsyncCompletionCallback<DownloadAnswer> callback) {
    boolean downloadJobExists = false;
    TemplateDataStoreVO vmTemplateStore;
    DataStore store = template.getDataStore();
    vmTemplateStore = _vmTemplateStoreDao.findByStoreTemplate(store.getId(), template.getId());
    if (vmTemplateStore == null) {
        vmTemplateStore = new TemplateDataStoreVO(store.getId(), template.getId(), new Date(), 0, Status.NOT_DOWNLOADED, null, null, "jobid0000", null, template.getUri());
        vmTemplateStore.setDataStoreRole(store.getRole());
        vmTemplateStore = _vmTemplateStoreDao.persist(vmTemplateStore);
    } else if ((vmTemplateStore.getJobId() != null) && (vmTemplateStore.getJobId().length() > 2)) {
        downloadJobExists = true;
    }
    Long maxTemplateSizeInBytes = getMaxTemplateSizeInBytes();
    if (vmTemplateStore != null) {
        start();
        DownloadCommand dcmd = new DownloadCommand((TemplateObjectTO) (template.getTO()), maxTemplateSizeInBytes);
        dcmd.setProxy(getHttpProxy());
        if (downloadJobExists) {
            dcmd = new DownloadProgressCommand(dcmd, vmTemplateStore.getJobId(), RequestType.GET_OR_RESTART);
        }
        if (vmTemplateStore.isCopy()) {
            dcmd.setCreds(TemplateConstants.DEFAULT_HTTP_AUTH_USER, _copyAuthPasswd);
        }
        EndPoint ep = _epSelector.select(template);
        if (ep == null) {
            String errMsg = "There is no secondary storage VM for downloading template to image store " + store.getName();
            LOGGER.warn(errMsg);
            throw new CloudRuntimeException(errMsg);
        }
        DownloadListener dl = new DownloadListener(ep, store, template, _timer, this, dcmd, callback);
        // initialize those auto-wired field in download listener.
        ComponentContext.inject(dl);
        if (downloadJobExists) {
            // due to handling existing download job issues, we still keep
            // downloadState in template_store_ref to avoid big change in
            // DownloadListener to use
            // new ObjectInDataStore.State transition. TODO: fix this later
            // to be able to remove downloadState from template_store_ref.
            LOGGER.info("found existing download job");
            dl.setCurrState(vmTemplateStore.getDownloadState());
        }
        try {
            ep.sendMessageAsync(dcmd, new UploadListener.Callback(ep.getId(), dl));
        } catch (Exception e) {
            LOGGER.warn("Unable to start /resume download of template " + template.getId() + " to " + store.getName(), e);
            dl.setDisconnected();
            dl.scheduleStatusCheck(RequestType.GET_OR_RESTART);
        }
    }
}