opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/Shard.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
   9 package org.opendaylight.controller.cluster.datastore;
  10
  11 import akka.actor.ActorRef;
  12 import akka.actor.ActorSelection;
  13 import akka.actor.Props;
  14 import akka.event.Logging;
  15 import akka.event.LoggingAdapter;
  16 import akka.japi.Creator;
  17 import akka.persistence.Persistent;
  18 import akka.persistence.UntypedProcessor;
  19 import com.google.common.util.concurrent.ListenableFuture;
  20 import com.google.common.util.concurrent.ListeningExecutorService;
  21 import com.google.common.util.concurrent.MoreExecutors;
  22 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
  23 import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction;
  24 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionChain;
  25 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionChainReply;
  26 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply;
  27 import org.opendaylight.controller.cluster.datastore.messages.ForwardedCommitTransaction;
  28 import org.opendaylight.controller.cluster.datastore.messages.NonPersistent;
  29 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
  30 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
  31 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
  32 import org.opendaylight.controller.cluster.datastore.modification.Modification;
  33 import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification;
  34 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
  35 import org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore;
  36 import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction;
  37 import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
  38 import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionChain;
  39 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
  40 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  41 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  42
  43 import java.util.HashMap;
  44 import java.util.Map;
  45 import java.util.concurrent.ExecutionException;
  46 import java.util.concurrent.Executors;
  47
  48 /**
  49  * A Shard represents a portion of the logical data tree <br/>
  50  * <p>
  51  * Our Shard uses InMemoryDataStore as it's internal representation and delegates all requests it
  52  * </p>
  53  */
  54 public class Shard extends UntypedProcessor {
  55
  56     public static final String DEFAULT_NAME = "default";
  57
  58     private final ListeningExecutorService storeExecutor =
  59         MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(2));
  60
  61     private final InMemoryDOMDataStore store;
  62
  63     private final Map<Object, DOMStoreThreePhaseCommitCohort>
  64         modificationToCohort = new HashMap<>();
  65
  66     private final LoggingAdapter log =
  67         Logging.getLogger(getContext().system(), this);
  68
  69     // By default persistent will be true and can be turned off using the system
  70     // property persistent
  71     private final boolean persistent;
  72
  73     private SchemaContext schemaContext;
  74
  75     private Shard(String name) {
  76
  77         String setting = System.getProperty("shard.persistent");
  78         this.persistent = !"false".equals(setting);
  79
  80         log.info("Creating shard : {} persistent : {}", name , persistent);
  81
  82         store = new InMemoryDOMDataStore(name, storeExecutor);
  83     }
  84
  85     public static Props props(final String name) {
  86         return Props.create(new Creator<Shard>() {
  87
  88             @Override
  89             public Shard create() throws Exception {
  90                 return new Shard(name);
  91             }
  92
  93         });
  94     }
  95
  96
  97     @Override
  98     public void onReceive(Object message) throws Exception {
  99         log.debug("Received message {}", message);
 100
 101         if(!recoveryFinished()){
 102             // FIXME : Properly handle recovery
 103             return;
 104         }
 105
 106         if (message instanceof CreateTransactionChain) {
 107             createTransactionChain();
 108         } else if (message instanceof RegisterChangeListener) {
 109             registerChangeListener((RegisterChangeListener) message);
 110         } else if (message instanceof UpdateSchemaContext) {
 111             updateSchemaContext((UpdateSchemaContext) message);
 112         } else if (message instanceof ForwardedCommitTransaction) {
 113             handleForwardedCommit((ForwardedCommitTransaction) message);
 114         } else if (message instanceof Persistent) {
 115             commit(((Persistent)message).payload());
 116         } else if (message instanceof CreateTransaction) {
 117             createTransaction((CreateTransaction) message);
 118         } else if(message instanceof NonPersistent){
 119             commit(((NonPersistent)message).payload());
 120         }
 121     }
 122
 123     private void createTransaction(CreateTransaction createTransaction) {
 124         DOMStoreReadWriteTransaction transaction =
 125             store.newReadWriteTransaction();
 126         ActorRef transactionActor = getContext().actorOf(
 127             ShardTransaction.props(transaction, getSelf(), schemaContext), "shard-" + createTransaction.getTransactionId());
 128         getSender()
 129             .tell(new CreateTransactionReply(transactionActor.path().toString(), createTransaction.getTransactionId()).toSerializable(),
 130                 getSelf());
 131     }
 132
 133     private void commit(Object serialized) {
 134         Modification modification = MutableCompositeModification.fromSerializable(serialized, schemaContext);
 135         DOMStoreThreePhaseCommitCohort cohort =
 136             modificationToCohort.remove(serialized);
 137         if (cohort == null) {
 138             log.error(
 139                 "Could not find cohort for modification : " + modification);
 140             return;
 141         }
 142         final ListenableFuture<Void> future = cohort.commit();
 143         final ActorRef sender = getSender();
 144         final ActorRef self = getSelf();
 145         future.addListener(new Runnable() {
 146             @Override
 147             public void run() {
 148                 try {
 149                     future.get();
 150                     sender.tell(new CommitTransactionReply(), self);
 151                 } catch (InterruptedException | ExecutionException e) {
 152                     // FIXME : Handle this properly
 153                     log.error(e, "An exception happened when committing");
 154                 }
 155             }
 156         }, getContext().dispatcher());
 157     }
 158
 159     private void handleForwardedCommit(ForwardedCommitTransaction message) {
 160         Object serializedModification = message.getModification().toSerializable();
 161
 162         modificationToCohort
 163             .put(serializedModification , message.getCohort());
 164         if(persistent) {
 165             getSelf().forward(Persistent.create(serializedModification),
 166                 getContext());
 167         } else {
 168             getSelf().forward(NonPersistent.create(serializedModification),
 169                 getContext());
 170         }
 171     }
 172
 173     private void updateSchemaContext(UpdateSchemaContext message) {
 174         this.schemaContext = message.getSchemaContext();
 175         store.onGlobalContextUpdated(message.getSchemaContext());
 176     }
 177
 178     private void registerChangeListener(
 179         RegisterChangeListener registerChangeListener) {
 180
 181         ActorSelection dataChangeListenerPath = getContext()
 182             .system().actorSelection(registerChangeListener.getDataChangeListenerPath());
 183
 184         AsyncDataChangeListener<InstanceIdentifier, NormalizedNode<?, ?>>
 185             listener = new DataChangeListenerProxy(dataChangeListenerPath);
 186
 187         org.opendaylight.yangtools.concepts.ListenerRegistration<AsyncDataChangeListener<InstanceIdentifier, NormalizedNode<?, ?>>>
 188             registration =
 189             store.registerChangeListener(registerChangeListener.getPath(),
 190                 listener, registerChangeListener.getScope());
 191         ActorRef listenerRegistration =
 192             getContext().actorOf(
 193                 DataChangeListenerRegistration.props(registration));
 194         getSender()
 195             .tell(new RegisterChangeListenerReply(listenerRegistration.path()),
 196                 getSelf());
 197     }
 198
 199     private void createTransactionChain() {
 200         DOMStoreTransactionChain chain = store.createTransactionChain();
 201         ActorRef transactionChain =
 202             getContext().actorOf(ShardTransactionChain.props(chain, schemaContext));
 203         getSender()
 204             .tell(new CreateTransactionChainReply(transactionChain.path()),
 205                 getSelf());
 206     }
 207 }