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