X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-binding-broker%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fsal%2Fbinding%2Fimpl%2Fconnect%2Fdom%2FBindingIndependentConnector.java;h=a398abc75a3254c3160ae685f9d829920f726f6c;hp=e6e935c920b613c577d4b9f890092a22c13cb49d;hb=b23703bef6c3aaafe2dc83608a03b738ad42f945;hpb=4b5f54e25c08fc21c955ff75901abe96b12d3340 diff --git a/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/sal/binding/impl/connect/dom/BindingIndependentConnector.java b/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/sal/binding/impl/connect/dom/BindingIndependentConnector.java index e6e935c920..a398abc75a 100644 --- a/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/sal/binding/impl/connect/dom/BindingIndependentConnector.java +++ b/opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/sal/binding/impl/connect/dom/BindingIndependentConnector.java @@ -28,13 +28,13 @@ import java.util.concurrent.ConcurrentMap; import java.util.concurrent.ExecutionException; import java.util.concurrent.Future; +import org.opendaylight.controller.md.sal.binding.impl.AbstractForwardedDataBroker; import org.opendaylight.controller.md.sal.common.api.RegistrationListener; import org.opendaylight.controller.md.sal.common.api.TransactionStatus; import org.opendaylight.controller.md.sal.common.api.data.DataCommitHandler; import org.opendaylight.controller.md.sal.common.api.data.DataCommitHandler.DataCommitTransaction; import org.opendaylight.controller.md.sal.common.api.data.DataCommitHandlerRegistration; import org.opendaylight.controller.md.sal.common.api.data.DataModification; -import org.opendaylight.controller.md.sal.common.api.data.DataReader; import org.opendaylight.controller.md.sal.common.api.routing.RouteChange; import org.opendaylight.controller.md.sal.common.api.routing.RouteChangeListener; import org.opendaylight.controller.md.sal.common.api.routing.RouteChangePublisher; @@ -45,6 +45,8 @@ import org.opendaylight.controller.sal.binding.api.data.DataProviderService; import org.opendaylight.controller.sal.binding.api.data.RuntimeDataProvider; import org.opendaylight.controller.sal.binding.api.rpc.RpcContextIdentifier; import org.opendaylight.controller.sal.binding.api.rpc.RpcRouter; +import org.opendaylight.controller.sal.binding.impl.DataBrokerImpl; +import org.opendaylight.controller.sal.binding.impl.MountPointManagerImpl.BindingMountPointImpl; import org.opendaylight.controller.sal.binding.impl.RpcProviderRegistryImpl; import org.opendaylight.controller.sal.binding.impl.RpcProviderRegistryImpl.GlobalRpcRegistrationListener; import org.opendaylight.controller.sal.binding.impl.RpcProviderRegistryImpl.RouterInstantiationListener; @@ -89,6 +91,7 @@ import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableSet; import com.google.common.collect.ImmutableSet.Builder; import com.google.common.util.concurrent.Futures; +import com.google.common.util.concurrent.ListenableFuture; public class BindingIndependentConnector implements // RuntimeDataProvider, // @@ -99,8 +102,6 @@ public class BindingIndependentConnector implements // private final Logger LOG = LoggerFactory.getLogger(BindingIndependentConnector.class); - @SuppressWarnings("deprecation") - private static final InstanceIdentifier ROOT = InstanceIdentifier.builder().toInstance(); private static final org.opendaylight.yangtools.yang.data.api.InstanceIdentifier ROOT_BI = org.opendaylight.yangtools.yang.data.api.InstanceIdentifier .builder().toInstance(); @@ -133,14 +134,12 @@ public class BindingIndependentConnector implements // private final Function, org.opendaylight.yangtools.yang.data.api.InstanceIdentifier> toDOMInstanceIdentifier = new Function, org.opendaylight.yangtools.yang.data.api.InstanceIdentifier>() { @Override - public org.opendaylight.yangtools.yang.data.api.InstanceIdentifier apply(InstanceIdentifier input) { + public org.opendaylight.yangtools.yang.data.api.InstanceIdentifier apply(final InstanceIdentifier input) { return mappingService.toDataDom(input); } }; - private Registration, DataObject>> baDataReaderRegistration; - private boolean rpcForwarding = false; private boolean dataForwarding = false; @@ -162,7 +161,7 @@ public class BindingIndependentConnector implements // } @Override - public DataObject readOperationalData(InstanceIdentifier path) { + public DataObject readOperationalData(final InstanceIdentifier path) { try { org.opendaylight.yangtools.yang.data.api.InstanceIdentifier biPath = mappingService.toDataDom(path); CompositeNode result = biDataService.readOperationalData(biPath); @@ -173,7 +172,7 @@ public class BindingIndependentConnector implements // } private DataObject potentialAugmentationRead(InstanceIdentifier path, - org.opendaylight.yangtools.yang.data.api.InstanceIdentifier biPath, CompositeNode result) + final org.opendaylight.yangtools.yang.data.api.InstanceIdentifier biPath, final CompositeNode result) throws DeserializationException { Class targetType = path.getTargetType(); if (Augmentation.class.isAssignableFrom(targetType)) { @@ -188,7 +187,7 @@ public class BindingIndependentConnector implements // } @Override - public DataObject readConfigurationData(InstanceIdentifier path) { + public DataObject readConfigurationData(final InstanceIdentifier path) { try { org.opendaylight.yangtools.yang.data.api.InstanceIdentifier biPath = mappingService.toDataDom(path); CompositeNode result = biDataService.readConfigurationData(biPath); @@ -199,7 +198,7 @@ public class BindingIndependentConnector implements // } private DataModificationTransaction createBindingToDomTransaction( - DataModification, DataObject> source) { + final DataModification, DataObject> source) { DataModificationTransaction target = biDataService.beginTransaction(); LOG.debug("Created DOM Transaction {} for {},", target.getIdentifier(),source.getIdentifier()); for (InstanceIdentifier entry : source.getRemovedConfigurationData()) { @@ -231,7 +230,7 @@ public class BindingIndependentConnector implements // } private org.opendaylight.controller.sal.binding.api.data.DataModificationTransaction createDomToBindingTransaction( - DataModification source) { + final DataModification source) { org.opendaylight.controller.sal.binding.api.data.DataModificationTransaction target = baDataService .beginTransaction(); for (org.opendaylight.yangtools.yang.data.api.InstanceIdentifier entry : source.getRemovedConfigurationData()) { @@ -280,7 +279,7 @@ public class BindingIndependentConnector implements // return biDataService; } - protected void setDomDataService(org.opendaylight.controller.sal.core.api.data.DataProviderService biDataService) { + protected void setDomDataService(final org.opendaylight.controller.sal.core.api.data.DataProviderService biDataService) { this.biDataService = biDataService; } @@ -288,7 +287,7 @@ public class BindingIndependentConnector implements // return baDataService; } - protected void setBindingDataService(DataProviderService baDataService) { + protected void setBindingDataService(final DataProviderService baDataService) { this.baDataService = baDataService; } @@ -296,21 +295,37 @@ public class BindingIndependentConnector implements // return baRpcRegistry; } - protected void setBindingRpcRegistry(RpcProviderRegistry rpcRegistry) { + protected void setBindingRpcRegistry(final RpcProviderRegistry rpcRegistry) { this.baRpcRegistry = rpcRegistry; } public void startDataForwarding() { - checkState(!dataForwarding, "Connector is already forwarding data."); - baDataReaderRegistration = baDataService.registerDataReader(ROOT, this); - baCommitHandlerRegistration = baDataService.registerCommitHandler(ROOT, bindingToDomCommitHandler); - biCommitHandlerRegistration = biDataService.registerCommitHandler(ROOT_BI, domToBindingCommitHandler); - baDataService.registerCommitHandlerListener(domToBindingCommitHandler); + if(baDataService instanceof AbstractForwardedDataBroker) { + dataForwarding = true; + return; + } + + final DataProviderService baData; + if (baDataService instanceof BindingMountPointImpl) { + baData = ((BindingMountPointImpl)baDataService).getDataBrokerImpl(); + LOG.debug("Extracted BA Data provider {} from mount point {}", baData, baDataService); + } else { + baData = baDataService; + } + + if (baData instanceof DataBrokerImpl) { + checkState(!dataForwarding, "Connector is already forwarding data."); + ((DataBrokerImpl) baData).setDataReadDelegate(this); + ((DataBrokerImpl) baData).setRootCommitHandler(bindingToDomCommitHandler); + biCommitHandlerRegistration = biDataService.registerCommitHandler(ROOT_BI, domToBindingCommitHandler); + baDataService.registerCommitHandlerListener(domToBindingCommitHandler); + } + dataForwarding = true; } public void startRpcForwarding() { - if (baRpcRegistry != null && biRpcRegistry != null && baRpcRegistry instanceof RouteChangePublisher) { + if (biRpcRegistry != null && baRpcRegistry instanceof RouteChangePublisher) { checkState(!rpcForwarding, "Connector is already forwarding RPCs"); domToBindingRpcManager = baRpcRegistry.registerRouteChangeListener(new DomToBindingRpcForwardingManager()); if (baRpcRegistry instanceof RpcProviderRegistryImpl) { @@ -331,7 +346,7 @@ public class BindingIndependentConnector implements // } } - protected void setMappingService(BindingIndependentMappingService mappingService) { + protected void setMappingService(final BindingIndependentMappingService mappingService) { this.mappingService = mappingService; } @@ -341,17 +356,17 @@ public class BindingIndependentConnector implements // } @Override - public void onSessionInitiated(ProviderSession session) { + public void onSessionInitiated(final ProviderSession session) { setDomDataService(session.getService(org.opendaylight.controller.sal.core.api.data.DataProviderService.class)); setDomRpcRegistry(session.getService(RpcProvisionRegistry.class)); } - public void onRpcRouterCreated(Class serviceType, RpcRouter router) { + public void onRpcRouterCreated(final Class serviceType, final RpcRouter router) { } - public void setDomRpcRegistry(RpcProvisionRegistry registry) { + public void setDomRpcRegistry(final RpcProvisionRegistry registry) { biRpcRegistry = registry; } @@ -373,8 +388,8 @@ public class BindingIndependentConnector implements // private final DataModification modification; public DomToBindingTransaction( - org.opendaylight.controller.sal.binding.api.data.DataModificationTransaction backing, - DataModification modification) { + final org.opendaylight.controller.sal.binding.api.data.DataModificationTransaction backing, + final DataModification modification) { super(); this.backing = backing; this.modification = modification; @@ -412,8 +427,8 @@ public class BindingIndependentConnector implements // private final DataModificationTransaction backing; private final DataModification, DataObject> modification; - public BindingToDomTransaction(DataModificationTransaction backing, - DataModification, DataObject> modification) { + public BindingToDomTransaction(final DataModificationTransaction backing, + final DataModification, DataObject> modification) { this.backing = backing; this.modification = modification; domOpenedTransactions.put(backing.getIdentifier(), this); @@ -451,7 +466,7 @@ public class BindingIndependentConnector implements // @Override public org.opendaylight.controller.md.sal.common.api.data.DataCommitHandler.DataCommitTransaction, DataObject> requestCommit( - DataModification, DataObject> bindingTransaction) { + final DataModification, DataObject> bindingTransaction) { /** * Transaction was created as DOM transaction, in that case we do @@ -474,7 +489,7 @@ public class BindingIndependentConnector implements // DataCommitHandler { @Override - public void onRegister(DataCommitHandlerRegistration, DataObject> registration) { + public void onRegister(final DataCommitHandlerRegistration, DataObject> registration) { org.opendaylight.yangtools.yang.data.api.InstanceIdentifier domPath = mappingService.toDataDom(registration .getPath()); @@ -482,14 +497,14 @@ public class BindingIndependentConnector implements // } @Override - public void onUnregister(DataCommitHandlerRegistration, DataObject> registration) { + public void onUnregister(final DataCommitHandlerRegistration, DataObject> registration) { // NOOP for now // FIXME: do registration based on only active commit handlers. } @Override public org.opendaylight.controller.md.sal.common.api.data.DataCommitHandler.DataCommitTransaction requestCommit( - DataModification domTransaction) { + final DataModification domTransaction) { Object identifier = domTransaction.getIdentifier(); /** @@ -527,34 +542,34 @@ public class BindingIndependentConnector implements // return registryImpl; } - public void setRegistryImpl(RpcProviderRegistryImpl registryImpl) { + public void setRegistryImpl(final RpcProviderRegistryImpl registryImpl) { this.registryImpl = registryImpl; } @Override - public void onGlobalRpcRegistered(Class cls) { + public void onGlobalRpcRegistered(final Class cls) { getRpcForwarder(cls, null); } @Override - public void onGlobalRpcUnregistered(Class cls) { + public void onGlobalRpcUnregistered(final Class cls) { // NOOP } @Override - public void onRpcRouterCreated(RpcRouter router) { + public void onRpcRouterCreated(final RpcRouter router) { Class ctx = router.getContexts().iterator().next(); getRpcForwarder(router.getServiceType(), ctx); } @Override - public void onRouteChange(RouteChange> change) { + public void onRouteChange(final RouteChange> change) { for (Entry>> entry : change.getAnnouncements().entrySet()) { bindingRoutesAdded(entry); } } - private void bindingRoutesAdded(Entry>> entry) { + private void bindingRoutesAdded(final Entry>> entry) { Class context = entry.getKey().getRoutingContext(); Class service = entry.getKey().getRpcService(); if (context != null) { @@ -562,8 +577,8 @@ public class BindingIndependentConnector implements // } } - private DomToBindingRpcForwarder getRpcForwarder(Class service, - Class context) { + private DomToBindingRpcForwarder getRpcForwarder(final Class service, + final Class context) { DomToBindingRpcForwarder potential = forwarders.get(service); if (potential != null) { return potential; @@ -588,7 +603,7 @@ public class BindingIndependentConnector implements // private final Map strategiesByQName = new HashMap<>(); private final WeakHashMap strategiesByMethod = new WeakHashMap<>(); - public DomToBindingRpcForwarder(Class service) { + public DomToBindingRpcForwarder(final Class service) { this.rpcServiceType = new WeakReference>(service); this.supportedRpcs = mappingService.getRpcQNamesFor(service); try { @@ -611,7 +626,7 @@ public class BindingIndependentConnector implements // * @param service * @param context */ - public DomToBindingRpcForwarder(Class service, Class context) { + public DomToBindingRpcForwarder(final Class service, final Class context) { this.rpcServiceType = new WeakReference>(service); this.supportedRpcs = mappingService.getRpcQNamesFor(service); Builder registrationsBuilder = ImmutableSet @@ -630,8 +645,8 @@ public class BindingIndependentConnector implements // registrations = registrationsBuilder.build(); } - public void registerPaths(Class context, Class service, - Set> set) { + public void registerPaths(final Class context, final Class service, + final Set> set) { QName ctx = BindingReflections.findQName(context); for (org.opendaylight.yangtools.yang.data.api.InstanceIdentifier path : FluentIterable.from(set).transform( toDOMInstanceIdentifier)) { @@ -643,7 +658,7 @@ public class BindingIndependentConnector implements // @Override - public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { + public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable { if (EQUALS_METHOD.equals(method)) { return false; } @@ -657,8 +672,8 @@ public class BindingIndependentConnector implements // return strategy.forwardToDomBroker(null); } - public void removePaths(Class context, Class service, - Set> set) { + public void removePaths(final Class context, final Class service, + final Set> set) { QName ctx = BindingReflections.findQName(context); for (org.opendaylight.yangtools.yang.data.api.InstanceIdentifier path : FluentIterable.from(set).transform( toDOMInstanceIdentifier)) { @@ -685,8 +700,9 @@ public class BindingIndependentConnector implements // } } + @Override - public RpcResult invokeRpc(QName rpc, CompositeNode domInput) { + public ListenableFuture> invokeRpc(final QName rpc, final CompositeNode domInput) { checkArgument(rpc != null); checkArgument(domInput != null); @@ -695,14 +711,15 @@ public class BindingIndependentConnector implements // RpcService rpcService = baRpcRegistry.getRpcService(rpcType); checkState(rpcService != null); CompositeNode domUnwrappedInput = domInput.getFirstCompositeByName(QName.create(rpc, "input")); + try { - return resolveInvocationStrategy(rpc).invokeOn(rpcService, domUnwrappedInput); + return Futures.immediateFuture(resolveInvocationStrategy(rpc).invokeOn(rpcService, domUnwrappedInput)); } catch (Exception e) { - throw new IllegalStateException(e); + return Futures.immediateFailedFuture(e); } } - private RpcInvocationStrategy resolveInvocationStrategy(QName rpc) { + private RpcInvocationStrategy resolveInvocationStrategy(final QName rpc) { return strategiesByQName.get(rpc); } @@ -750,7 +767,7 @@ public class BindingIndependentConnector implements // protected final Method targetMethod; protected final QName rpc; - public RpcInvocationStrategy(QName rpc, Method targetMethod) { + public RpcInvocationStrategy(final QName rpc, final Method targetMethod) { this.targetMethod = targetMethod; this.rpc = rpc; } @@ -760,7 +777,7 @@ public class BindingIndependentConnector implements // public abstract RpcResult uncheckedInvoke(RpcService rpcService, CompositeNode domInput) throws Exception; - public RpcResult invokeOn(RpcService rpcService, CompositeNode domInput) throws Exception { + public RpcResult invokeOn(final RpcService rpcService, final CompositeNode domInput) throws Exception { return uncheckedInvoke(rpcService, domInput); } } @@ -774,8 +791,8 @@ public class BindingIndependentConnector implements // private final WeakReference outputClass; @SuppressWarnings({ "rawtypes", "unchecked" }) - public DefaultInvocationStrategy(QName rpc, Method targetMethod, Class outputClass, - Class inputClass) { + public DefaultInvocationStrategy(final QName rpc, final Method targetMethod, final Class outputClass, + final Class inputClass) { super(rpc, targetMethod); this.outputClass = new WeakReference(outputClass); this.inputClass = new WeakReference(inputClass); @@ -783,7 +800,7 @@ public class BindingIndependentConnector implements // @SuppressWarnings("unchecked") @Override - public RpcResult uncheckedInvoke(RpcService rpcService, CompositeNode domInput) throws Exception { + public RpcResult uncheckedInvoke(final RpcService rpcService, final CompositeNode domInput) throws Exception { DataContainer bindingInput = mappingService.dataObjectFromDataDom(inputClass.get(), domInput); Future> futureResult = (Future>) targetMethod.invoke(rpcService, bindingInput); if (futureResult == null) { @@ -799,31 +816,35 @@ public class BindingIndependentConnector implements // } @Override - public Future> forwardToDomBroker(DataObject input) { - if(biRpcRegistry != null) { - CompositeNode xml = mappingService.toDataDom(input); - CompositeNode wrappedXml = ImmutableCompositeNode.create(rpc, ImmutableList.> of(xml)); - RpcResult result = biRpcRegistry.invokeRpc(rpc, wrappedXml); - Object baResultValue = null; - if (result.getResult() != null) { - baResultValue = mappingService.dataObjectFromDataDom(outputClass.get(), result.getResult()); - } - RpcResult baResult = Rpcs.getRpcResult(result.isSuccessful(), baResultValue, result.getErrors()); - return Futures.> immediateFuture(baResult); + public ListenableFuture> forwardToDomBroker(final DataObject input) { + if(biRpcRegistry == null) { + return Futures.> immediateFuture(Rpcs.getRpcResult(false)); } - return Futures.> immediateFuture(Rpcs.getRpcResult(false)); - } + CompositeNode xml = mappingService.toDataDom(input); + CompositeNode wrappedXml = ImmutableCompositeNode.create(rpc, ImmutableList.> of(xml)); + + return Futures.transform(biRpcRegistry.invokeRpc(rpc, wrappedXml), new Function, RpcResult>() { + @Override + public RpcResult apply(RpcResult input) { + Object baResultValue = null; + if (input.getResult() != null) { + baResultValue = mappingService.dataObjectFromDataDom(outputClass.get(), input.getResult()); + } + return Rpcs.getRpcResult(input.isSuccessful(), baResultValue, input.getErrors()); + } + }); + } } private class NoInputNoOutputInvocationStrategy extends RpcInvocationStrategy { - public NoInputNoOutputInvocationStrategy(QName rpc, Method targetMethod) { + public NoInputNoOutputInvocationStrategy(final QName rpc, final Method targetMethod) { super(rpc, targetMethod); } @Override - public RpcResult uncheckedInvoke(RpcService rpcService, CompositeNode domInput) throws Exception { + public RpcResult uncheckedInvoke(final RpcService rpcService, final CompositeNode domInput) throws Exception { @SuppressWarnings("unchecked") Future> result = (Future>) targetMethod.invoke(rpcService); RpcResult bindingResult = result.get(); @@ -831,7 +852,7 @@ public class BindingIndependentConnector implements // } @Override - public Future> forwardToDomBroker(DataObject input) { + public Future> forwardToDomBroker(final DataObject input) { return Futures.immediateFuture(null); } } @@ -843,15 +864,15 @@ public class BindingIndependentConnector implements // private final WeakReference inputClass; @SuppressWarnings({ "rawtypes", "unchecked" }) - public NoOutputInvocationStrategy(QName rpc, Method targetMethod, - Class inputClass) { + public NoOutputInvocationStrategy(final QName rpc, final Method targetMethod, + final Class inputClass) { super(rpc,targetMethod); this.inputClass = new WeakReference(inputClass); } @Override - public RpcResult uncheckedInvoke(RpcService rpcService, CompositeNode domInput) throws Exception { + public RpcResult uncheckedInvoke(final RpcService rpcService, final CompositeNode domInput) throws Exception { DataContainer bindingInput = mappingService.dataObjectFromDataDom(inputClass.get(), domInput); Future> result = (Future>) targetMethod.invoke(rpcService, bindingInput); if (result == null) { @@ -862,18 +883,21 @@ public class BindingIndependentConnector implements // } @Override - public Future> forwardToDomBroker(DataObject input) { - if(biRpcRegistry != null) { - CompositeNode xml = mappingService.toDataDom(input); - CompositeNode wrappedXml = ImmutableCompositeNode.create(rpc,ImmutableList.>of(xml)); - RpcResult result = biRpcRegistry.invokeRpc(rpc, wrappedXml); - Object baResultValue = null; - RpcResult baResult = Rpcs.getRpcResult(result.isSuccessful(), null, result.getErrors()); - return Futures.>immediateFuture(baResult); + public ListenableFuture> forwardToDomBroker(final DataObject input) { + if(biRpcRegistry == null) { + return Futures.> immediateFuture(Rpcs.getRpcResult(false)); } - return Futures.>immediateFuture(Rpcs.getRpcResult(false)); - } + CompositeNode xml = mappingService.toDataDom(input); + CompositeNode wrappedXml = ImmutableCompositeNode.create(rpc,ImmutableList.>of(xml)); + + return Futures.transform(biRpcRegistry.invokeRpc(rpc, wrappedXml), new Function, RpcResult>() { + @Override + public RpcResult apply(RpcResult input) { + return Rpcs.getRpcResult(input.isSuccessful(), null, input.getErrors()); + } + }); + } } public boolean isRpcForwarding() { @@ -892,12 +916,12 @@ public class BindingIndependentConnector implements // return mappingService; } - public void setBindingNotificationService(NotificationProviderService baService) { + public void setBindingNotificationService(final NotificationProviderService baService) { this.baNotifyService = baService; } - public void setDomNotificationService(NotificationPublishService domService) { + public void setDomNotificationService(final NotificationPublishService domService) { this.domNotificationService = domService; } @@ -912,7 +936,7 @@ public class BindingIndependentConnector implements // } @Override - public void onNotification(CompositeNode notification) { + public void onNotification(final CompositeNode notification) { QName qname = notification.getNodeType(); WeakReference> potential = notifications.get(qname); if (potential != null) { @@ -929,7 +953,7 @@ public class BindingIndependentConnector implements // } @Override - public void onNotificationSubscribtion(Class notificationType) { + public void onNotificationSubscribtion(final Class notificationType) { QName qname = BindingReflections.findQName(notificationType); if (qname != null) { WeakReference> already = notifications.putIfAbsent(qname,