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