opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ShardDataTree.java

   1 /*
   2  * Copyright (c) 2015 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.controller.cluster.datastore;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.base.Strings;
  13 import java.util.AbstractMap.SimpleEntry;
  14 import java.util.HashMap;
  15 import java.util.Map;
  16 import java.util.Map.Entry;
  17 import javax.annotation.concurrent.NotThreadSafe;
  18 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
  19 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
  20 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  21 import org.opendaylight.controller.md.sal.dom.store.impl.DataChangeListenerRegistration;
  22 import org.opendaylight.controller.md.sal.dom.store.impl.ResolveDataChangeEventsTask;
  23 import org.opendaylight.controller.md.sal.dom.store.impl.tree.ListenerTree;
  24 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  26 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  27 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  28 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateTip;
  29 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;
  30 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  31 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
  32 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  33 import org.opendaylight.yangtools.yang.data.api.schema.tree.TipProducingDataTree;
  34 import org.opendaylight.yangtools.yang.data.api.schema.tree.TreeType;
  35 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 /**
  41  * Internal shard state, similar to a DOMStore, but optimized for use in the actor system,
  42  * e.g. it does not expose public interfaces and assumes it is only ever called from a
  43  * single thread.
  44  *
  45  * This class is not part of the API contract and is subject to change at any time.
  46  */
  47 @NotThreadSafe
  48 public class ShardDataTree extends ShardDataTreeTransactionParent {
  49     private static final Logger LOG = LoggerFactory.getLogger(ShardDataTree.class);
  50     private static final YangInstanceIdentifier ROOT_PATH = YangInstanceIdentifier.builder().build();
  51     private static final ShardDataTreeNotificationManager MANAGER = new ShardDataTreeNotificationManager();
  52     private final Map<String, ShardDataTreeTransactionChain> transactionChains = new HashMap<>();
  53     private final ShardDataTreeChangePublisher treeChangePublisher = new ShardDataTreeChangePublisher();
  54     private final ListenerTree listenerTree = ListenerTree.create();
  55     private final TipProducingDataTree dataTree;
  56     private SchemaContext schemaContext;
  57
  58     public ShardDataTree(final SchemaContext schemaContext, final TreeType treeType) {
  59         dataTree = InMemoryDataTreeFactory.getInstance().create(treeType);
  60         updateSchemaContext(schemaContext);
  61     }
  62
  63     public TipProducingDataTree getDataTree() {
  64         return dataTree;
  65     }
  66
  67     SchemaContext getSchemaContext() {
  68         return schemaContext;
  69     }
  70
  71     void updateSchemaContext(final SchemaContext schemaContext) {
  72         Preconditions.checkNotNull(schemaContext);
  73         this.schemaContext = schemaContext;
  74         dataTree.setSchemaContext(schemaContext);
  75     }
  76
  77     private ShardDataTreeTransactionChain ensureTransactionChain(final String chainId) {
  78         ShardDataTreeTransactionChain chain = transactionChains.get(chainId);
  79         if (chain == null) {
  80             chain = new ShardDataTreeTransactionChain(chainId, this);
  81             transactionChains.put(chainId, chain);
  82         }
  83
  84         return chain;
  85     }
  86
  87     ReadOnlyShardDataTreeTransaction newReadOnlyTransaction(final String txId, final String chainId) {
  88         if (Strings.isNullOrEmpty(chainId)) {
  89             return new ReadOnlyShardDataTreeTransaction(txId, dataTree.takeSnapshot());
  90         }
  91
  92         return ensureTransactionChain(chainId).newReadOnlyTransaction(txId);
  93     }
  94
  95     ReadWriteShardDataTreeTransaction newReadWriteTransaction(final String txId, final String chainId) {
  96         if (Strings.isNullOrEmpty(chainId)) {
  97             return new ReadWriteShardDataTreeTransaction(ShardDataTree.this, txId, dataTree.takeSnapshot()
  98                     .newModification());
  99         }
 100
 101         return ensureTransactionChain(chainId).newReadWriteTransaction(txId);
 102     }
 103
 104     public void notifyListeners(final DataTreeCandidate candidate) {
 105         LOG.debug("Notifying listeners on candidate {}", candidate);
 106
 107         // DataTreeChanges first, as they are more light-weight
 108         treeChangePublisher.publishChanges(candidate);
 109
 110         // DataChanges second, as they are heavier
 111         ResolveDataChangeEventsTask.create(candidate, listenerTree).resolve(MANAGER);
 112     }
 113
 114     void notifyOfInitialData(DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
 115             NormalizedNode<?, ?>>> listenerReg, Optional<DataTreeCandidate> currentState) {
 116
 117         if(currentState.isPresent()) {
 118             ListenerTree localListenerTree = ListenerTree.create();
 119             localListenerTree.registerDataChangeListener(listenerReg.getPath(), listenerReg.getInstance(),
 120                     listenerReg.getScope());
 121
 122             ResolveDataChangeEventsTask.create(currentState.get(), localListenerTree).resolve(MANAGER);
 123         }
 124     }
 125
 126     void notifyOfInitialData(final YangInstanceIdentifier path, final DOMDataTreeChangeListener listener,
 127             final Optional<DataTreeCandidate> currentState) {
 128         if(currentState.isPresent()) {
 129             ShardDataTreeChangePublisher localTreeChangePublisher = new ShardDataTreeChangePublisher();
 130             localTreeChangePublisher.registerTreeChangeListener(path, listener);
 131             localTreeChangePublisher.publishChanges(currentState.get());
 132         }
 133     }
 134
 135     void closeAllTransactionChains() {
 136         for (ShardDataTreeTransactionChain chain : transactionChains.values()) {
 137             chain.close();
 138         }
 139
 140         transactionChains.clear();
 141     }
 142
 143     void closeTransactionChain(final String transactionChainId) {
 144         final ShardDataTreeTransactionChain chain = transactionChains.remove(transactionChainId);
 145         if (chain != null) {
 146             chain.close();
 147         } else {
 148             LOG.debug("Closing non-existent transaction chain {}", transactionChainId);
 149         }
 150     }
 151
 152     Entry<DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
 153             Optional<DataTreeCandidate>> registerChangeListener(final YangInstanceIdentifier path,
 154                     final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener,
 155                     final DataChangeScope scope) {
 156         final DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> reg =
 157                 listenerTree.registerDataChangeListener(path, listener, scope);
 158
 159         return new SimpleEntry<>(reg, readCurrentData());
 160     }
 161
 162     private Optional<DataTreeCandidate> readCurrentData() {
 163         final Optional<NormalizedNode<?, ?>> currentState = dataTree.takeSnapshot().readNode(ROOT_PATH);
 164         return currentState.isPresent() ? Optional.of(DataTreeCandidates.fromNormalizedNode(
 165                 ROOT_PATH, currentState.get())) : Optional.<DataTreeCandidate>absent();
 166     }
 167
 168     public Entry<ListenerRegistration<DOMDataTreeChangeListener>, Optional<DataTreeCandidate>> registerTreeChangeListener(
 169             final YangInstanceIdentifier path, final DOMDataTreeChangeListener listener) {
 170         final ListenerRegistration<DOMDataTreeChangeListener> reg = treeChangePublisher.registerTreeChangeListener(
 171                 path, listener);
 172
 173         return new SimpleEntry<>(reg, readCurrentData());
 174     }
 175
 176     void applyForeignCandidate(final String identifier, final DataTreeCandidate foreign) throws DataValidationFailedException {
 177         LOG.debug("Applying foreign transaction {}", identifier);
 178
 179         final DataTreeModification mod = dataTree.takeSnapshot().newModification();
 180         DataTreeCandidates.applyToModification(mod, foreign);
 181         mod.ready();
 182
 183         LOG.trace("Applying foreign modification {}", mod);
 184         dataTree.validate(mod);
 185         final DataTreeCandidate candidate = dataTree.prepare(mod);
 186         dataTree.commit(candidate);
 187         notifyListeners(candidate);
 188     }
 189
 190     @Override
 191     void abortTransaction(final AbstractShardDataTreeTransaction<?> transaction) {
 192         // Intentional no-op
 193     }
 194
 195     @Override
 196     ShardDataTreeCohort finishTransaction(final ReadWriteShardDataTreeTransaction transaction) {
 197         final DataTreeModification snapshot = transaction.getSnapshot();
 198         snapshot.ready();
 199         return new SimpleShardDataTreeCohort(this, snapshot, transaction.getId());
 200     }
 201
 202     public Optional<NormalizedNode<?, ?>> readNode(YangInstanceIdentifier path) {
 203         return dataTree.takeSnapshot().readNode(path);
 204     }
 205
 206     public DataTreeSnapshot takeSnapshot() {
 207         return dataTree.takeSnapshot();
 208     }
 209
 210     public DataTreeModification newModification() {
 211         return dataTree.takeSnapshot().newModification();
 212     }
 213
 214     public DataTreeCandidate commit(DataTreeModification modification) throws DataValidationFailedException {
 215         modification.ready();
 216         dataTree.validate(modification);
 217         DataTreeCandidateTip candidate = dataTree.prepare(modification);
 218         dataTree.commit(candidate);
 219         return candidate;
 220     }
 221 }