opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/AbstractTransactionContextFactory.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 static java.util.Objects.requireNonNull;
  11
  12 import akka.actor.ActorSelection;
  13 import java.util.Collection;
  14 import java.util.Optional;
  15 import java.util.concurrent.ConcurrentHashMap;
  16 import java.util.concurrent.ConcurrentMap;
  17 import java.util.concurrent.atomic.AtomicLongFieldUpdater;
  18 import org.eclipse.jdt.annotation.NonNull;
  19 import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
  20 import org.opendaylight.controller.cluster.access.concepts.MemberName;
  21 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  22 import org.opendaylight.controller.cluster.datastore.messages.PrimaryShardInfo;
  23 import org.opendaylight.controller.cluster.datastore.utils.ActorUtils;
  24 import org.opendaylight.mdsal.dom.spi.store.DOMStoreReadTransaction;
  25 import org.opendaylight.mdsal.dom.spi.store.DOMStoreReadWriteTransaction;
  26 import org.opendaylight.mdsal.dom.spi.store.DOMStoreWriteTransaction;
  27 import org.opendaylight.yangtools.yang.data.api.schema.tree.ReadOnlyDataTree;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30 import scala.concurrent.Future;
  31 import scala.util.Try;
  32
  33 /**
  34  * Factory for creating local and remote TransactionContext instances. Maintains a cache of known local
  35  * transaction factories.
  36  */
  37 abstract class AbstractTransactionContextFactory<F extends LocalTransactionFactory> implements AutoCloseable {
  38     private static final Logger LOG = LoggerFactory.getLogger(AbstractTransactionContextFactory.class);
  39     @SuppressWarnings("rawtypes")
  40     private static final AtomicLongFieldUpdater<AbstractTransactionContextFactory> TX_COUNTER_UPDATER =
  41             AtomicLongFieldUpdater.newUpdater(AbstractTransactionContextFactory.class, "nextTx");
  42
  43     private final ConcurrentMap<String, F> knownLocal = new ConcurrentHashMap<>();
  44     private final LocalHistoryIdentifier historyId;
  45     private final ActorUtils actorUtils;
  46
  47     // Used via TX_COUNTER_UPDATER
  48     @SuppressWarnings("unused")
  49     private volatile long nextTx;
  50
  51     protected AbstractTransactionContextFactory(final ActorUtils actorUtils, final LocalHistoryIdentifier historyId) {
  52         this.actorUtils = requireNonNull(actorUtils);
  53         this.historyId = requireNonNull(historyId);
  54     }
  55
  56     final ActorUtils getActorUtils() {
  57         return actorUtils;
  58     }
  59
  60     final LocalHistoryIdentifier getHistoryId() {
  61         return historyId;
  62     }
  63
  64     @SuppressWarnings("checkstyle:IllegalCatch")
  65     private TransactionContext maybeCreateLocalTransactionContext(final TransactionProxy parent,
  66             final String shardName) {
  67         final LocalTransactionFactory local = knownLocal.get(shardName);
  68         if (local != null) {
  69             LOG.debug("Tx {} - Creating local component for shard {} using factory {}", parent.getIdentifier(),
  70                 shardName, local);
  71
  72             try {
  73                 return createLocalTransactionContext(local, parent);
  74             } catch (Exception e) {
  75                 return new NoOpTransactionContext(e, parent.getIdentifier());
  76             }
  77         }
  78
  79         return null;
  80     }
  81
  82     private AbstractTransactionContextWrapper maybeCreateDirectTransactionContextWrapper(
  83             final PrimaryShardInfo primaryShardInfo, final TransactionProxy parent,
  84             final String shardName, final DelayedTransactionContextWrapper transactionContextWrapper) {
  85         LOG.debug("Tx {}: Found primary {} for shard {}, trying to use DirectTransactionContextWrapper",
  86                 parent.getIdentifier(), primaryShardInfo.getPrimaryShardActor(), shardName);
  87
  88         updateShardInfo(shardName, primaryShardInfo);
  89
  90         final TransactionContext localContext = maybeCreateLocalTransactionContext(parent, shardName);
  91         try {
  92             if (localContext != null) {
  93                 LOG.debug("Tx {}: Local transaction context created successfully, using DirectTransactionWrapper",
  94                         parent.getIdentifier());
  95                 return new DirectTransactionContextWrapper(parent.getIdentifier(), actorUtils, shardName,
  96                         localContext);
  97             } else {
  98                 LOG.debug("Tx {}: Local transaction context creation failed, using DelayedTransactionWrapper",
  99                         parent.getIdentifier());
 100                 final RemoteTransactionContextSupport remote = new RemoteTransactionContextSupport(
 101                         transactionContextWrapper, parent, shardName);
 102                 remote.setPrimaryShard(primaryShardInfo);
 103                 return transactionContextWrapper;
 104             }
 105         } finally {
 106             onTransactionContextCreated(parent.getIdentifier());
 107         }
 108     }
 109
 110     private void onFindPrimaryShardSuccess(final PrimaryShardInfo primaryShardInfo, final TransactionProxy parent,
 111             final String shardName, final DelayedTransactionContextWrapper transactionContextWrapper) {
 112         LOG.debug("Tx {}: Found primary {} for shard {}", parent.getIdentifier(),
 113                 primaryShardInfo.getPrimaryShardActor(), shardName);
 114
 115         updateShardInfo(shardName, primaryShardInfo);
 116
 117         final TransactionContext localContext = maybeCreateLocalTransactionContext(parent, shardName);
 118         try {
 119             if (localContext != null) {
 120                 transactionContextWrapper.executePriorTransactionOperations(localContext);
 121             } else {
 122                 final RemoteTransactionContextSupport remote = new RemoteTransactionContextSupport(
 123                         transactionContextWrapper, parent, shardName);
 124                 remote.setPrimaryShard(primaryShardInfo);
 125             }
 126         } finally {
 127             onTransactionContextCreated(parent.getIdentifier());
 128         }
 129     }
 130
 131     private void onFindPrimaryShardFailure(final Throwable failure, final TransactionProxy parent,
 132             final String shardName, final DelayedTransactionContextWrapper transactionContextWrapper) {
 133         LOG.debug("Tx {}: Find primary for shard {} failed", parent.getIdentifier(), shardName, failure);
 134
 135         try {
 136             transactionContextWrapper.executePriorTransactionOperations(
 137                     new NoOpTransactionContext(failure, parent.getIdentifier()));
 138         } finally {
 139             onTransactionContextCreated(parent.getIdentifier());
 140         }
 141     }
 142
 143     final AbstractTransactionContextWrapper newTransactionContextWrapper(final TransactionProxy parent,
 144             final String shardName) {
 145         final DelayedTransactionContextWrapper contextWrapper = new DelayedTransactionContextWrapper(
 146                 parent.getIdentifier(), actorUtils, shardName);
 147         final Future<PrimaryShardInfo> findPrimaryFuture = findPrimaryShard(shardName, parent.getIdentifier());
 148         if (findPrimaryFuture.isCompleted()) {
 149             final Try<PrimaryShardInfo> maybe = findPrimaryFuture.value().get();
 150             if (maybe.isSuccess()) {
 151                 return maybeCreateDirectTransactionContextWrapper(maybe.get(), parent, shardName,
 152                         contextWrapper);
 153             } else {
 154                 onFindPrimaryShardFailure(maybe.failed().get(), parent, shardName,
 155                         contextWrapper);
 156             }
 157         } else {
 158             findPrimaryFuture.onComplete(result -> {
 159                 if (result.isSuccess()) {
 160                     onFindPrimaryShardSuccess(result.get(), parent, shardName, contextWrapper);
 161                 } else {
 162                     onFindPrimaryShardFailure(result.failed().get(), parent, shardName, contextWrapper);
 163                 }
 164                 return null;
 165             }, actorUtils.getClientDispatcher());
 166         }
 167         return contextWrapper;
 168     }
 169
 170     private void updateShardInfo(final String shardName, final PrimaryShardInfo primaryShardInfo) {
 171         final Optional<ReadOnlyDataTree> maybeDataTree = primaryShardInfo.getLocalShardDataTree();
 172         if (maybeDataTree.isPresent()) {
 173             if (!knownLocal.containsKey(shardName)) {
 174                 LOG.debug("Shard {} resolved to local data tree - adding local factory", shardName);
 175
 176                 F factory = factoryForShard(shardName, primaryShardInfo.getPrimaryShardActor(), maybeDataTree.get());
 177                 knownLocal.putIfAbsent(shardName, factory);
 178             }
 179         } else if (knownLocal.containsKey(shardName)) {
 180             LOG.debug("Shard {} invalidating local data tree", shardName);
 181
 182             knownLocal.remove(shardName);
 183         }
 184     }
 185
 186     protected final MemberName getMemberName() {
 187         return historyId.getClientId().getFrontendId().getMemberName();
 188     }
 189
 190     /**
 191      * Create an identifier for the next TransactionProxy attached to this component
 192      * factory.
 193      * @return Transaction identifier, may not be null.
 194      */
 195     protected final TransactionIdentifier nextIdentifier() {
 196         return new TransactionIdentifier(historyId, TX_COUNTER_UPDATER.getAndIncrement(this));
 197     }
 198
 199     /**
 200      * Find the primary shard actor.
 201      *
 202      * @param shardName Shard name
 203      * @return Future containing shard information.
 204      */
 205     protected abstract Future<PrimaryShardInfo> findPrimaryShard(@NonNull String shardName,
 206             @NonNull TransactionIdentifier txId);
 207
 208     /**
 209      * Create local transaction factory for specified shard, backed by specified shard leader
 210      * and data tree instance.
 211      *
 212      * @param shardName the shard name
 213      * @param shardLeader the shard leader
 214      * @param dataTree Backing data tree instance. The data tree may only be accessed in
 215      *                 read-only manner.
 216      * @return Transaction factory for local use.
 217      */
 218     protected abstract F factoryForShard(String shardName, ActorSelection shardLeader, ReadOnlyDataTree dataTree);
 219
 220     /**
 221      * Callback invoked from child transactions to push any futures, which need to
 222      * be waited for before the next transaction is allocated.
 223      * @param cohortFutures Collection of futures
 224      */
 225     protected abstract <T> void onTransactionReady(@NonNull TransactionIdentifier transaction,
 226             @NonNull Collection<Future<T>> cohortFutures);
 227
 228     /**
 229      * Callback invoked when the internal TransactionContext has been created for a transaction.
 230      *
 231      * @param transactionId the ID of the transaction.
 232      */
 233     protected abstract void onTransactionContextCreated(@NonNull TransactionIdentifier transactionId);
 234
 235     private static TransactionContext createLocalTransactionContext(final LocalTransactionFactory factory,
 236                                                                     final TransactionProxy parent) {
 237
 238         switch (parent.getType()) {
 239             case READ_ONLY:
 240                 final DOMStoreReadTransaction readOnly = factory.newReadOnlyTransaction(parent.getIdentifier());
 241                 return new LocalTransactionContext(readOnly, parent.getIdentifier(), factory) {
 242                     @Override
 243                     DOMStoreWriteTransaction getWriteDelegate() {
 244                         throw new UnsupportedOperationException();
 245                     }
 246
 247                     @Override
 248                     DOMStoreReadTransaction getReadDelegate() {
 249                         return readOnly;
 250                     }
 251                 };
 252             case READ_WRITE:
 253                 final DOMStoreReadWriteTransaction readWrite = factory.newReadWriteTransaction(parent.getIdentifier());
 254                 return new LocalTransactionContext(readWrite, parent.getIdentifier(), factory) {
 255                     @Override
 256                     DOMStoreWriteTransaction getWriteDelegate() {
 257                         return readWrite;
 258                     }
 259
 260                     @Override
 261                     DOMStoreReadTransaction getReadDelegate() {
 262                         return readWrite;
 263                     }
 264                 };
 265             case WRITE_ONLY:
 266                 final DOMStoreWriteTransaction writeOnly = factory.newWriteOnlyTransaction(parent.getIdentifier());
 267                 return new LocalTransactionContext(writeOnly, parent.getIdentifier(), factory) {
 268                     @Override
 269                     DOMStoreWriteTransaction getWriteDelegate() {
 270                         return writeOnly;
 271                     }
 272
 273                     @Override
 274                     DOMStoreReadTransaction getReadDelegate() {
 275                         throw new UnsupportedOperationException();
 276                     }
 277                 };
 278             default:
 279                 throw new IllegalArgumentException("Invalid transaction type: " + parent.getType());
 280         }
 281     }
 282 }