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

   1 /*
   2  * Copyright (c) 2014 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 akka.actor.ActorSelection;
  11 import com.google.common.annotations.VisibleForTesting;
  12 import com.google.common.base.Function;
  13 import com.google.common.base.Optional;
  14 import com.google.common.base.Preconditions;
  15 import com.google.common.base.Supplier;
  16 import com.google.common.collect.Iterables;
  17 import com.google.common.util.concurrent.CheckedFuture;
  18 import com.google.common.util.concurrent.Futures;
  19 import com.google.common.util.concurrent.ListenableFuture;
  20 import com.google.common.util.concurrent.SettableFuture;
  21 import java.util.ArrayList;
  22 import java.util.Collection;
  23 import java.util.HashMap;
  24 import java.util.List;
  25 import java.util.Map;
  26 import java.util.Map.Entry;
  27 import java.util.Set;
  28 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  29 import org.opendaylight.controller.cluster.datastore.messages.AbstractRead;
  30 import org.opendaylight.controller.cluster.datastore.messages.DataExists;
  31 import org.opendaylight.controller.cluster.datastore.messages.ReadData;
  32 import org.opendaylight.controller.cluster.datastore.modification.AbstractModification;
  33 import org.opendaylight.controller.cluster.datastore.modification.DeleteModification;
  34 import org.opendaylight.controller.cluster.datastore.modification.MergeModification;
  35 import org.opendaylight.controller.cluster.datastore.modification.WriteModification;
  36 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  37 import org.opendaylight.controller.cluster.datastore.utils.NormalizedNodeAggregator;
  38 import org.opendaylight.controller.cluster.datastore.utils.TransactionIdentifierUtils;
  39 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  40 import org.opendaylight.controller.sal.core.spi.data.AbstractDOMStoreTransaction;
  41 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
  42 import org.opendaylight.yangtools.util.concurrent.MappingCheckedFuture;
  43 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  44 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  45 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
  46 import org.slf4j.Logger;
  47 import org.slf4j.LoggerFactory;
  48 import scala.concurrent.Future;
  49 import scala.concurrent.Promise;
  50
  51 /**
  52  * A transaction potentially spanning multiple backend shards.
  53  */
  54 public class TransactionProxy extends AbstractDOMStoreTransaction<TransactionIdentifier> implements DOMStoreReadWriteTransaction {
  55     private static enum TransactionState {
  56         OPEN,
  57         READY,
  58         CLOSED,
  59     }
  60     private static final Logger LOG = LoggerFactory.getLogger(TransactionProxy.class);
  61
  62     private final Map<String, TransactionContextWrapper> txContextWrappers = new HashMap<>();
  63     private final AbstractTransactionContextFactory<?> txContextFactory;
  64     private final TransactionType type;
  65     private TransactionState state = TransactionState.OPEN;
  66
  67     @VisibleForTesting
  68     public TransactionProxy(final AbstractTransactionContextFactory<?> txContextFactory, final TransactionType type) {
  69         super(txContextFactory.nextIdentifier(), txContextFactory.getActorContext().getDatastoreContext()
  70                 .isTransactionDebugContextEnabled());
  71         this.txContextFactory = txContextFactory;
  72         this.type = Preconditions.checkNotNull(type);
  73
  74         LOG.debug("New {} Tx - {}", type, getIdentifier());
  75     }
  76
  77     @Override
  78     public CheckedFuture<Boolean, ReadFailedException> exists(final YangInstanceIdentifier path) {
  79         return executeRead(shardNameFromIdentifier(path), new DataExists(path, DataStoreVersions.CURRENT_VERSION));
  80     }
  81
  82     private <T> CheckedFuture<T, ReadFailedException> executeRead(String shardName, final AbstractRead<T> readCmd) {
  83         Preconditions.checkState(type != TransactionType.WRITE_ONLY, "Reads from write-only transactions are not allowed");
  84
  85         if(LOG.isDebugEnabled()) {
  86             LOG.debug("Tx {} {} {}", getIdentifier(), readCmd.getClass().getSimpleName(), readCmd.getPath());
  87         }
  88
  89         final SettableFuture<T> proxyFuture = SettableFuture.create();
  90         TransactionContextWrapper contextWrapper = getContextWrapper(shardName);
  91         contextWrapper.maybeExecuteTransactionOperation(new TransactionOperation() {
  92             @Override
  93             public void invoke(TransactionContext transactionContext) {
  94                 transactionContext.executeRead(readCmd, proxyFuture);
  95             }
  96         });
  97
  98         return MappingCheckedFuture.create(proxyFuture, ReadFailedException.MAPPER);
  99     }
 100
 101     @Override
 102     public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(final YangInstanceIdentifier path) {
 103         Preconditions.checkState(type != TransactionType.WRITE_ONLY, "Reads from write-only transactions are not allowed");
 104
 105         LOG.debug("Tx {} read {}", getIdentifier(), path);
 106
 107         if (YangInstanceIdentifier.EMPTY.equals(path)) {
 108             return readAllData();
 109         } else {
 110             return singleShardRead(shardNameFromIdentifier(path), path);
 111         }
 112     }
 113
 114     private CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> singleShardRead(
 115             final String shardName, final YangInstanceIdentifier path) {
 116         return executeRead(shardName, new ReadData(path, DataStoreVersions.CURRENT_VERSION));
 117     }
 118
 119     private CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readAllData() {
 120         final Set<String> allShardNames = txContextFactory.getActorContext().getConfiguration().getAllShardNames();
 121         final Collection<CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException>> futures = new ArrayList<>(allShardNames.size());
 122
 123         for (String shardName : allShardNames) {
 124             futures.add(singleShardRead(shardName, YangInstanceIdentifier.EMPTY));
 125         }
 126
 127         final ListenableFuture<List<Optional<NormalizedNode<?, ?>>>> listFuture = Futures.allAsList(futures);
 128         final ListenableFuture<Optional<NormalizedNode<?, ?>>> aggregateFuture;
 129
 130         aggregateFuture = Futures.transform(listFuture, new Function<List<Optional<NormalizedNode<?, ?>>>, Optional<NormalizedNode<?, ?>>>() {
 131             @Override
 132             public Optional<NormalizedNode<?, ?>> apply(final List<Optional<NormalizedNode<?, ?>>> input) {
 133                 try {
 134                     return NormalizedNodeAggregator.aggregate(YangInstanceIdentifier.EMPTY, input, txContextFactory.getActorContext().getSchemaContext());
 135                 } catch (DataValidationFailedException e) {
 136                     throw new IllegalArgumentException("Failed to aggregate", e);
 137                 }
 138             }
 139         });
 140
 141         return MappingCheckedFuture.create(aggregateFuture, ReadFailedException.MAPPER);
 142     }
 143
 144     @Override
 145     public void delete(final YangInstanceIdentifier path) {
 146         executeModification(new DeleteModification(path));
 147     }
 148
 149     @Override
 150     public void merge(final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
 151         executeModification(new MergeModification(path, data));
 152     }
 153
 154     @Override
 155     public void write(final YangInstanceIdentifier path, final NormalizedNode<?, ?> data) {
 156         executeModification(new WriteModification(path, data));
 157     }
 158
 159     private void executeModification(final AbstractModification modification) {
 160         checkModificationState();
 161
 162         if(LOG.isDebugEnabled()) {
 163             LOG.debug("Tx {} executeModification {} {}", getIdentifier(), modification.getClass().getSimpleName(),
 164                     modification.getPath());
 165         }
 166
 167         TransactionContextWrapper contextWrapper = getContextWrapper(modification.getPath());
 168         contextWrapper.maybeExecuteTransactionOperation(new TransactionOperation() {
 169             @Override
 170             protected void invoke(TransactionContext transactionContext) {
 171                 transactionContext.executeModification(modification);
 172             }
 173         });
 174     }
 175
 176     private void checkModificationState() {
 177         Preconditions.checkState(type != TransactionType.READ_ONLY,
 178                 "Modification operation on read-only transaction is not allowed");
 179         Preconditions.checkState(state == TransactionState.OPEN,
 180                 "Transaction is sealed - further modifications are not allowed");
 181     }
 182
 183     private boolean seal(final TransactionState newState) {
 184         if (state == TransactionState.OPEN) {
 185             state = newState;
 186             return true;
 187         } else {
 188             return false;
 189         }
 190     }
 191
 192     @Override
 193     public final void close() {
 194         if (!seal(TransactionState.CLOSED)) {
 195             Preconditions.checkState(state == TransactionState.CLOSED, "Transaction %s is ready, it cannot be closed",
 196                 getIdentifier());
 197             // Idempotent no-op as per AutoCloseable recommendation
 198             return;
 199         }
 200
 201         for (TransactionContextWrapper contextWrapper : txContextWrappers.values()) {
 202             contextWrapper.maybeExecuteTransactionOperation(new TransactionOperation() {
 203                 @Override
 204                 public void invoke(TransactionContext transactionContext) {
 205                     transactionContext.closeTransaction();
 206                 }
 207             });
 208         }
 209
 210
 211         txContextWrappers.clear();
 212     }
 213
 214     @Override
 215     public final AbstractThreePhaseCommitCohort<?> ready() {
 216         Preconditions.checkState(type != TransactionType.READ_ONLY, "Read-only transactions cannot be readied");
 217
 218         final boolean success = seal(TransactionState.READY);
 219         Preconditions.checkState(success, "Transaction %s is %s, it cannot be readied", getIdentifier(), state);
 220
 221         LOG.debug("Tx {} Readying {} components for commit", getIdentifier(), txContextWrappers.size());
 222
 223         final AbstractThreePhaseCommitCohort<?> ret;
 224         switch (txContextWrappers.size()) {
 225         case 0:
 226             ret = NoOpDOMStoreThreePhaseCommitCohort.INSTANCE;
 227             break;
 228         case 1:
 229             final Entry<String, TransactionContextWrapper> e = Iterables.getOnlyElement(txContextWrappers.entrySet());
 230             ret = createSingleCommitCohort(e.getKey(), e.getValue());
 231             break;
 232         default:
 233             ret = createMultiCommitCohort(txContextWrappers.entrySet());
 234         }
 235
 236         txContextFactory.onTransactionReady(getIdentifier(), ret.getCohortFutures());
 237
 238         final Throwable debugContext = getDebugContext();
 239         return debugContext == null ? ret : new DebugThreePhaseCommitCohort(getIdentifier(), ret, debugContext);
 240     }
 241
 242     @SuppressWarnings({ "rawtypes", "unchecked" })
 243     private AbstractThreePhaseCommitCohort<?> createSingleCommitCohort(final String shardName,
 244             final TransactionContextWrapper contextWrapper) {
 245
 246         LOG.debug("Tx {} Readying transaction for shard {}", getIdentifier(), shardName);
 247
 248         final OperationCallback.Reference operationCallbackRef =
 249                 new OperationCallback.Reference(OperationCallback.NO_OP_CALLBACK);
 250
 251         final TransactionContext transactionContext = contextWrapper.getTransactionContext();
 252         final Future future;
 253         if (transactionContext == null) {
 254             final Promise promise = akka.dispatch.Futures.promise();
 255             contextWrapper.maybeExecuteTransactionOperation(new TransactionOperation() {
 256                 @Override
 257                 public void invoke(TransactionContext transactionContext) {
 258                     promise.completeWith(getDirectCommitFuture(transactionContext, operationCallbackRef));
 259                 }
 260             });
 261             future = promise.future();
 262         } else {
 263             // avoid the creation of a promise and a TransactionOperation
 264             future = getDirectCommitFuture(transactionContext, operationCallbackRef);
 265         }
 266
 267         return new SingleCommitCohortProxy(txContextFactory.getActorContext(), future, getIdentifier(),
 268             operationCallbackRef);
 269     }
 270
 271     private Future<?> getDirectCommitFuture(TransactionContext transactionContext,
 272             OperationCallback.Reference operationCallbackRef) {
 273         TransactionRateLimitingCallback rateLimitingCallback = new TransactionRateLimitingCallback(
 274                 txContextFactory.getActorContext());
 275         operationCallbackRef.set(rateLimitingCallback);
 276         rateLimitingCallback.run();
 277         return transactionContext.directCommit();
 278     }
 279
 280     private AbstractThreePhaseCommitCohort<ActorSelection> createMultiCommitCohort(
 281             final Set<Entry<String, TransactionContextWrapper>> txContextWrapperEntries) {
 282
 283         final List<ThreePhaseCommitCohortProxy.CohortInfo> cohorts = new ArrayList<>(txContextWrapperEntries.size());
 284         for (Entry<String, TransactionContextWrapper> e : txContextWrapperEntries) {
 285             LOG.debug("Tx {} Readying transaction for shard {}", getIdentifier(), e.getKey());
 286
 287             final TransactionContextWrapper wrapper = e.getValue();
 288
 289             // The remote tx version is obtained the via TransactionContext which may not be available yet so
 290             // we pass a Supplier to dynamically obtain it. Once the ready Future is resolved the
 291             // TransactionContext is available.
 292             Supplier<Short> txVersionSupplier = new Supplier<Short>() {
 293                 @Override
 294                 public Short get() {
 295                     return wrapper.getTransactionContext().getTransactionVersion();
 296                 }
 297             };
 298
 299             cohorts.add(new ThreePhaseCommitCohortProxy.CohortInfo(wrapper.readyTransaction(), txVersionSupplier));
 300         }
 301
 302         return new ThreePhaseCommitCohortProxy(txContextFactory.getActorContext(), cohorts,
 303                 TransactionIdentifierUtils.actorNameFor(getIdentifier()));
 304     }
 305
 306     private String shardNameFromIdentifier(final YangInstanceIdentifier path) {
 307         return txContextFactory.getActorContext().getShardStrategyFactory().getStrategy(path).findShard(path);
 308     }
 309
 310     private TransactionContextWrapper getContextWrapper(final YangInstanceIdentifier path) {
 311         return getContextWrapper(shardNameFromIdentifier(path));
 312     }
 313
 314     private TransactionContextWrapper getContextWrapper(final String shardName) {
 315         final TransactionContextWrapper existing = txContextWrappers.get(shardName);
 316         if (existing != null) {
 317             return existing;
 318         }
 319
 320         final TransactionContextWrapper fresh = txContextFactory.newTransactionContextWrapper(this, shardName);
 321         txContextWrappers.put(shardName, fresh);
 322         return fresh;
 323     }
 324
 325     TransactionType getType() {
 326         return type;
 327     }
 328
 329     boolean isReady() {
 330         return state != TransactionState.OPEN;
 331     }
 332
 333     ActorContext getActorContext() {
 334         return txContextFactory.getActorContext();
 335     }
 336 }