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.DOMImmutableDataChangeEvent;
  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.DataTreeCandidates;
  29 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
  30 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  31 import org.opendaylight.yangtools.yang.data.api.schema.tree.TipProducingDataTree;
  32 import org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTreeFactory;
  33 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 /**
  38  * Internal shard state, similar to a DOMStore, but optimized for use in the actor system,
  39  * e.g. it does not expose public interfaces and assumes it is only ever called from a
  40  * single thread.
  41  *
  42  * This class is not part of the API contract and is subject to change at any time.
  43  */
  44 @NotThreadSafe
  45 public class ShardDataTree extends ShardDataTreeTransactionParent {
  46     private static final Logger LOG = LoggerFactory.getLogger(ShardDataTree.class);
  47     private static final ShardDataTreeNotificationManager MANAGER = new ShardDataTreeNotificationManager();
  48     private final Map<String, ShardDataTreeTransactionChain> transactionChains = new HashMap<>();
  49     private final ShardDataTreeChangePublisher treeChangePublisher = new ShardDataTreeChangePublisher();
  50     private final ListenerTree listenerTree = ListenerTree.create();
  51     private final TipProducingDataTree dataTree;
  52     private SchemaContext schemaContext;
  53
  54     ShardDataTree(final SchemaContext schemaContext) {
  55         dataTree = InMemoryDataTreeFactory.getInstance().create();
  56         updateSchemaContext(schemaContext);
  57
  58     }
  59
  60     TipProducingDataTree getDataTree() {
  61         return dataTree;
  62     }
  63
  64     SchemaContext getSchemaContext() {
  65         return schemaContext;
  66     }
  67
  68     void updateSchemaContext(final SchemaContext schemaContext) {
  69         Preconditions.checkNotNull(schemaContext);
  70         this.schemaContext = schemaContext;
  71         dataTree.setSchemaContext(schemaContext);
  72     }
  73
  74     private ShardDataTreeTransactionChain ensureTransactionChain(final String chainId) {
  75         ShardDataTreeTransactionChain chain = transactionChains.get(chainId);
  76         if (chain == null) {
  77             chain = new ShardDataTreeTransactionChain(chainId, this);
  78             transactionChains.put(chainId, chain);
  79         }
  80
  81         return chain;
  82     }
  83
  84     ReadOnlyShardDataTreeTransaction newReadOnlyTransaction(final String txId, final String chainId) {
  85         if (Strings.isNullOrEmpty(chainId)) {
  86             return new ReadOnlyShardDataTreeTransaction(txId, dataTree.takeSnapshot());
  87         }
  88
  89         return ensureTransactionChain(chainId).newReadOnlyTransaction(txId);
  90     }
  91
  92     ReadWriteShardDataTreeTransaction newReadWriteTransaction(final String txId, final String chainId) {
  93         if (Strings.isNullOrEmpty(chainId)) {
  94             return new ReadWriteShardDataTreeTransaction(ShardDataTree.this, txId, dataTree.takeSnapshot()
  95                     .newModification());
  96         }
  97
  98         return ensureTransactionChain(chainId).newReadWriteTransaction(txId);
  99     }
 100
 101     void notifyListeners(final DataTreeCandidate candidate) {
 102         LOG.debug("Notifying listeners on candidate {}", candidate);
 103
 104         // DataTreeChanges first, as they are more light-weight
 105         treeChangePublisher.publishChanges(candidate);
 106
 107         // DataChanges second, as they are heavier
 108         ResolveDataChangeEventsTask.create(candidate, listenerTree).resolve(MANAGER);
 109     }
 110
 111     void closeAllTransactionChains() {
 112         for (ShardDataTreeTransactionChain chain : transactionChains.values()) {
 113             chain.close();
 114         }
 115
 116         transactionChains.clear();
 117     }
 118
 119     void closeTransactionChain(final String transactionChainId) {
 120         final ShardDataTreeTransactionChain chain = transactionChains.remove(transactionChainId);
 121         if (chain != null) {
 122             chain.close();
 123         } else {
 124             LOG.debug("Closing non-existent transaction chain {}", transactionChainId);
 125         }
 126     }
 127
 128     Entry<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>, DOMImmutableDataChangeEvent> registerChangeListener(
 129             final YangInstanceIdentifier path,
 130             final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener, final DataChangeScope scope) {
 131         final ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> reg =
 132                 listenerTree.registerDataChangeListener(path, listener, scope);
 133
 134         final Optional<NormalizedNode<?, ?>> currentState = dataTree.takeSnapshot().readNode(path);
 135         final DOMImmutableDataChangeEvent event;
 136         if (currentState.isPresent()) {
 137             final NormalizedNode<?, ?> data = currentState.get();
 138             event = DOMImmutableDataChangeEvent.builder(DataChangeScope.BASE).setAfter(data).addCreated(path, data).build();
 139         } else {
 140             event = null;
 141         }
 142
 143         return new SimpleEntry<>(reg, event);
 144     }
 145
 146     Entry<ListenerRegistration<DOMDataTreeChangeListener>, DataTreeCandidate> registerTreeChangeListener(final YangInstanceIdentifier path,
 147             final DOMDataTreeChangeListener listener) {
 148         final ListenerRegistration<DOMDataTreeChangeListener> reg = treeChangePublisher.registerTreeChangeListener(path, listener);
 149
 150         final Optional<NormalizedNode<?, ?>> currentState = dataTree.takeSnapshot().readNode(path);
 151         final DataTreeCandidate event;
 152         if (currentState.isPresent()) {
 153             event = DataTreeCandidates.fromNormalizedNode(path, currentState.get());
 154         } else {
 155             event = null;
 156         }
 157         return new SimpleEntry<>(reg, event);
 158     }
 159
 160     void applyForeignCandidate(final String identifier, final DataTreeCandidate foreign) throws DataValidationFailedException {
 161         LOG.debug("Applying foreign transaction {}", identifier);
 162
 163         final DataTreeModification mod = dataTree.takeSnapshot().newModification();
 164         DataTreeCandidates.applyToModification(mod, foreign);
 165         mod.ready();
 166
 167         LOG.trace("Applying foreign modification {}", mod);
 168         dataTree.validate(mod);
 169         final DataTreeCandidate candidate = dataTree.prepare(mod);
 170         dataTree.commit(candidate);
 171         notifyListeners(candidate);
 172     }
 173
 174     @Override
 175     void abortTransaction(final AbstractShardDataTreeTransaction<?> transaction) {
 176         // Intentional no-op
 177     }
 178
 179     @Override
 180     ShardDataTreeCohort finishTransaction(final ReadWriteShardDataTreeTransaction transaction) {
 181         final DataTreeModification snapshot = transaction.getSnapshot();
 182         snapshot.ready();
 183         return new SimpleShardDataTreeCohort(this, snapshot, transaction.getId());
 184     }
 185 }