restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/handlers/SchemaContextHandler.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.restconf.nb.rfc8040.handlers;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.base.Throwables;
  12 import java.util.Collection;
  13 import java.util.concurrent.ExecutionException;
  14 import java.util.concurrent.atomic.AtomicInteger;
  15 import javax.annotation.PostConstruct;
  16 import javax.annotation.PreDestroy;
  17 import javax.inject.Inject;
  18 import javax.inject.Singleton;
  19 import org.apache.aries.blueprint.annotation.service.Reference;
  20 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  21 import org.opendaylight.mdsal.common.api.TransactionCommitFailedException;
  22 import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteTransaction;
  23 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  24 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  25 import org.opendaylight.restconf.nb.rfc8040.Rfc8040.IetfYangLibrary;
  26 import org.opendaylight.restconf.nb.rfc8040.Rfc8040.MonitoringModule;
  27 import org.opendaylight.restconf.nb.rfc8040.utils.mapping.RestconfMappingNodeUtil;
  28 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  32 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  33 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  34 import org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException;
  35 import org.opendaylight.yangtools.yang.model.api.Module;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.opendaylight.yangtools.yang.model.api.SchemaContextListener;
  38 import org.slf4j.Logger;
  39 import org.slf4j.LoggerFactory;
  40
  41 /**
  42  * Implementation of {@link SchemaContextHandler}.
  43  */
  44 @Singleton
  45 @SuppressWarnings("checkstyle:FinalClass")
  46 public class SchemaContextHandler implements SchemaContextListenerHandler, AutoCloseable {
  47
  48     private static final Logger LOG = LoggerFactory.getLogger(SchemaContextHandler.class);
  49
  50     private final AtomicInteger moduleSetId = new AtomicInteger(0);
  51
  52     private final TransactionChainHandler transactionChainHandler;
  53     private final DOMSchemaService domSchemaService;
  54     private ListenerRegistration<SchemaContextListener> listenerRegistration;
  55
  56     private volatile SchemaContext schemaContext;
  57
  58     /**
  59      * Constructor.
  60      *
  61      * @param transactionChainHandler Transaction chain handler
  62      */
  63     @Inject
  64     public SchemaContextHandler(final TransactionChainHandler transactionChainHandler,
  65             final @Reference DOMSchemaService domSchemaService) {
  66         this.transactionChainHandler = transactionChainHandler;
  67         this.domSchemaService = domSchemaService;
  68     }
  69
  70     @Deprecated
  71     public static SchemaContextHandler newInstance(final TransactionChainHandler transactionChainHandler,
  72             final DOMSchemaService domSchemaService) {
  73         return new SchemaContextHandler(transactionChainHandler, domSchemaService);
  74     }
  75
  76     @PostConstruct
  77     public void init() {
  78         listenerRegistration = domSchemaService.registerSchemaContextListener(this);
  79     }
  80
  81     @Override
  82     @PreDestroy
  83     public void close() {
  84         if (listenerRegistration != null) {
  85             listenerRegistration.close();
  86         }
  87     }
  88
  89     @Override
  90     @SuppressWarnings("checkstyle:hiddenField")
  91     public void onGlobalContextUpdated(final SchemaContext context) {
  92         Preconditions.checkNotNull(context);
  93         schemaContext = context;
  94
  95         final Module ietfYangLibraryModule =
  96                 context.findModule(IetfYangLibrary.MODULE_QNAME).orElse(null);
  97         if (ietfYangLibraryModule != null) {
  98             NormalizedNode<NodeIdentifier, Collection<DataContainerChild<? extends PathArgument, ?>>> normNode =
  99                     RestconfMappingNodeUtil.mapModulesByIetfYangLibraryYang(context.getModules(), ietfYangLibraryModule,
 100                             context, String.valueOf(this.moduleSetId.incrementAndGet()));
 101             putData(normNode);
 102         }
 103
 104         final Module monitoringModule =
 105                 schemaContext.findModule(MonitoringModule.MODULE_QNAME).orElse(null);
 106         if (monitoringModule != null) {
 107             NormalizedNode<NodeIdentifier, Collection<DataContainerChild<? extends PathArgument, ?>>> normNode =
 108                     RestconfMappingNodeUtil.mapCapabilites(monitoringModule);
 109             putData(normNode);
 110         }
 111     }
 112
 113     @Override
 114     public SchemaContext get() {
 115         return schemaContext;
 116     }
 117
 118     private void putData(
 119             final NormalizedNode<NodeIdentifier, Collection<DataContainerChild<? extends PathArgument, ?>>> normNode) {
 120         final DOMDataTreeWriteTransaction wTx = this.transactionChainHandler.get().newWriteOnlyTransaction();
 121         wTx.put(LogicalDatastoreType.OPERATIONAL,
 122                 YangInstanceIdentifier.create(NodeIdentifier.create(normNode.getNodeType())), normNode);
 123         try {
 124             wTx.commit().get();
 125         } catch (InterruptedException e) {
 126             throw new RestconfDocumentedException("Problem occurred while putting data to DS.", e);
 127         } catch (ExecutionException e) {
 128             final TransactionCommitFailedException failure = Throwables.getCauseAs(e,
 129                 TransactionCommitFailedException.class);
 130             if (failure.getCause() instanceof ConflictingModificationAppliedException) {
 131                 /*
 132                  * Ignore error when another cluster node is already putting the same data to DS.
 133                  * We expect that cluster is homogeneous and that node was going to write the same data
 134                  * (that means no retry is needed). Transaction chain reset must be invoked to be able
 135                  * to continue writing data with another transaction after failed transaction.
 136                  * This is workaround for bug https://bugs.opendaylight.org/show_bug.cgi?id=7728
 137                  */
 138                 LOG.warn("Ignoring that another cluster node is already putting the same data to DS.", e);
 139                 this.transactionChainHandler.reset();
 140             } else {
 141                 throw new RestconfDocumentedException("Problem occurred while putting data to DS.", failure);
 142             }
 143         }
 144     }
 145 }