d4d26d86b2ba0e9b7efca1b93ba57f8145ec7b62
[netconf.git] / 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.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.DOMDataBroker;
23 import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteTransaction;
24 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
25 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
26 import org.opendaylight.restconf.nb.rfc8040.Rfc8040.IetfYangLibrary;
27 import org.opendaylight.restconf.nb.rfc8040.utils.mapping.RestconfMappingNodeUtil;
28 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.restconf.monitoring.rev170126.RestconfState;
29 import org.opendaylight.yangtools.concepts.ListenerRegistration;
30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
32 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
33 import org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException;
34 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
35 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContextListener;
36 import org.opendaylight.yangtools.yang.model.api.Module;
37 import org.slf4j.Logger;
38 import org.slf4j.LoggerFactory;
39
40 /**
41  * Implementation of {@link SchemaContextHandler}.
42  */
43 // FIXME: this really is a service which is maintaining ietf-yang-library contents inside the datastore. It really
44 //        should live in MD-SAL and be a dynamic store fragment. As a first step we should be turning this into a
45 //        completely standalone application.
46 @Singleton
47 public class SchemaContextHandler implements EffectiveModelContextListener, AutoCloseable {
48     private static final Logger LOG = LoggerFactory.getLogger(SchemaContextHandler.class);
49
50     private final AtomicInteger moduleSetId = new AtomicInteger(0);
51
52     private final DOMDataBroker domDataBroker;
53     private final DOMSchemaService domSchemaService;
54     private ListenerRegistration<?> listenerRegistration;
55
56     private volatile EffectiveModelContext schemaContext;
57
58     @Inject
59     public SchemaContextHandler(@Reference final DOMDataBroker domDataBroker,
60             @Reference final DOMSchemaService domSchemaService) {
61         this.domDataBroker = requireNonNull(domDataBroker);
62         this.domSchemaService = requireNonNull(domSchemaService);
63     }
64
65     @PostConstruct
66     public void init() {
67         listenerRegistration = domSchemaService.registerSchemaContextListener(this);
68     }
69
70     @Override
71     @PreDestroy
72     public void close() {
73         if (listenerRegistration != null) {
74             listenerRegistration.close();
75         }
76     }
77
78     @Override
79     public void onModelContextUpdated(final EffectiveModelContext context) {
80         schemaContext = requireNonNull(context);
81
82         if (context.findModule(IetfYangLibrary.MODULE_QNAME).isPresent()) {
83             putData(RestconfMappingNodeUtil.mapModulesByIetfYangLibraryYang(context.getModules(), context,
84                 String.valueOf(this.moduleSetId.incrementAndGet())));
85         }
86
87         final Module monitoringModule = schemaContext.findModule(RestconfState.QNAME.getModule()).orElse(null);
88         if (monitoringModule != null) {
89             putData(RestconfMappingNodeUtil.mapCapabilites(monitoringModule));
90         }
91     }
92
93     public EffectiveModelContext get() {
94         return schemaContext;
95     }
96
97     private void putData(final ContainerNode normNode) {
98         final DOMDataTreeWriteTransaction wTx = domDataBroker.newWriteOnlyTransaction();
99         wTx.put(LogicalDatastoreType.OPERATIONAL,
100                 YangInstanceIdentifier.create(NodeIdentifier.create(normNode.getIdentifier().getNodeType())), normNode);
101         try {
102             wTx.commit().get();
103         } catch (InterruptedException e) {
104             throw new RestconfDocumentedException("Problem occurred while putting data to DS.", e);
105         } catch (ExecutionException e) {
106             final TransactionCommitFailedException failure = Throwables.getCauseAs(e,
107                 TransactionCommitFailedException.class);
108             if (failure.getCause() instanceof ConflictingModificationAppliedException) {
109                 /*
110                  * Ignore error when another cluster node is already putting the same data to DS.
111                  * We expect that cluster is homogeneous and that node was going to write the same data
112                  * (that means no retry is needed). Transaction chain reset must be invoked to be able
113                  * to continue writing data with another transaction after failed transaction.
114                  * This is workaround for bug https://bugs.opendaylight.org/show_bug.cgi?id=7728
115                  */
116                 LOG.warn("Ignoring that another cluster node is already putting the same data to DS.", e);
117             } else {
118                 throw new RestconfDocumentedException("Problem occurred while putting data to DS.", failure);
119             }
120         }
121     }
122 }