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

   1 /*
   2  * Copyright (c) 2016 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.PoisonPill;
  13 import akka.actor.Status;
  14 import akka.util.Timeout;
  15 import com.google.common.base.Preconditions;
  16 import java.util.ArrayList;
  17 import java.util.Collection;
  18 import java.util.Collections;
  19 import java.util.HashMap;
  20 import java.util.List;
  21 import java.util.Map;
  22 import javax.annotation.concurrent.NotThreadSafe;
  23 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  24 import org.opendaylight.controller.cluster.datastore.DataTreeCohortActor.CanCommit;
  25 import org.opendaylight.controller.md.sal.dom.spi.AbstractRegistrationTree;
  26 import org.opendaylight.controller.md.sal.dom.spi.RegistrationTreeNode;
  27 import org.opendaylight.controller.md.sal.dom.spi.RegistrationTreeSnapshot;
  28 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  29 import org.opendaylight.mdsal.dom.api.DOMDataTreeCandidate;
  30 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  33 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  34 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  35 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 /**
  41  * Registry of user commit cohorts, which is responsible for handling registration and calculation
  42  * of affected cohorts based on {@link DataTreeCandidate}.
  43  *
  44  */
  45 @NotThreadSafe
  46 class DataTreeCohortActorRegistry extends AbstractRegistrationTree<ActorRef> {
  47
  48     private static final Logger LOG = LoggerFactory.getLogger(DataTreeCohortActorRegistry.class);
  49
  50     private final Map<ActorRef, RegistrationTreeNode<ActorRef>> cohortToNode = new HashMap<>();
  51
  52     Collection<ActorRef> getCohortActors() {
  53         return Collections.unmodifiableCollection(cohortToNode.keySet());
  54     }
  55
  56     void registerCohort(final ActorRef sender, final RegisterCohort cohort) {
  57         takeLock();
  58         try {
  59             final ActorRef cohortRef = cohort.getCohort();
  60             final RegistrationTreeNode<ActorRef> node =
  61                     findNodeFor(cohort.getPath().getRootIdentifier().getPathArguments());
  62             addRegistration(node, cohort.getCohort());
  63             cohortToNode.put(cohortRef, node);
  64         } catch (final Exception e) {
  65             sender.tell(new Status.Failure(e), ActorRef.noSender());
  66             return;
  67         } finally {
  68             releaseLock();
  69         }
  70         sender.tell(new Status.Success(null), ActorRef.noSender());
  71     }
  72
  73     void removeCommitCohort(final ActorRef sender, final RemoveCohort message) {
  74         final ActorRef cohort = message.getCohort();
  75         final RegistrationTreeNode<ActorRef> node = cohortToNode.get(cohort);
  76         if (node != null) {
  77             removeRegistration(node, cohort);
  78             cohortToNode.remove(cohort);
  79         }
  80         sender.tell(new Status.Success(null), ActorRef.noSender());
  81         cohort.tell(PoisonPill.getInstance(), cohort);
  82     }
  83
  84     Collection<DataTreeCohortActor.CanCommit> createCanCommitMessages(final TransactionIdentifier txId,
  85             final DataTreeCandidate candidate, final SchemaContext schema) {
  86         try (RegistrationTreeSnapshot<ActorRef> cohorts = takeSnapshot()) {
  87             return new CanCommitMessageBuilder(txId, candidate, schema).perform(cohorts.getRootNode());
  88         }
  89     }
  90
  91     void process(final ActorRef sender, final CohortRegistryCommand message) {
  92         if (message instanceof RegisterCohort) {
  93             registerCohort(sender, (RegisterCohort) message);
  94         } else if (message instanceof RemoveCohort) {
  95             removeCommitCohort(sender, (RemoveCohort) message);
  96         }
  97     }
  98
  99     static abstract class CohortRegistryCommand {
 100
 101         private final ActorRef cohort;
 102
 103         CohortRegistryCommand(final ActorRef cohort) {
 104             this.cohort = Preconditions.checkNotNull(cohort);
 105         }
 106
 107         ActorRef getCohort() {
 108             return cohort;
 109         }
 110     }
 111
 112     static class RegisterCohort extends CohortRegistryCommand {
 113
 114         private final DOMDataTreeIdentifier path;
 115
 116         RegisterCohort(final DOMDataTreeIdentifier path, final ActorRef cohort) {
 117             super(cohort);
 118             this.path = path;
 119
 120         }
 121
 122         public DOMDataTreeIdentifier getPath() {
 123             return path;
 124         }
 125
 126     }
 127
 128     static class RemoveCohort extends CohortRegistryCommand {
 129
 130         RemoveCohort(final ActorRef cohort) {
 131             super(cohort);
 132         }
 133
 134     }
 135
 136     private static class CanCommitMessageBuilder {
 137
 138         private final TransactionIdentifier txId;
 139         private final DataTreeCandidate candidate;
 140         private final SchemaContext schema;
 141         private final Collection<DataTreeCohortActor.CanCommit> messages =
 142                 new ArrayList<>();
 143
 144         CanCommitMessageBuilder(final TransactionIdentifier txId, final DataTreeCandidate candidate, final SchemaContext schema) {
 145             this.txId = Preconditions.checkNotNull(txId);
 146             this.candidate = Preconditions.checkNotNull(candidate);
 147             this.schema = schema;
 148         }
 149
 150         private void lookupAndCreateCanCommits(final List<PathArgument> args, final int offset,
 151                 final RegistrationTreeNode<ActorRef> node) {
 152
 153             if (args.size() != offset) {
 154                 final PathArgument arg = args.get(offset);
 155                 final RegistrationTreeNode<ActorRef> exactChild = node.getExactChild(arg);
 156                 if (exactChild != null) {
 157                     lookupAndCreateCanCommits(args, offset + 1, exactChild);
 158                 }
 159                 for (final RegistrationTreeNode<ActorRef> c : node.getInexactChildren(arg)) {
 160                     lookupAndCreateCanCommits(args, offset + 1, c);
 161                 }
 162             } else {
 163                 lookupAndCreateCanCommits(candidate.getRootPath(), node, candidate.getRootNode());
 164             }
 165         }
 166
 167         private void lookupAndCreateCanCommits(final YangInstanceIdentifier path, final RegistrationTreeNode<ActorRef> regNode,
 168                 final DataTreeCandidateNode candNode) {
 169             if (candNode.getModificationType() == ModificationType.UNMODIFIED) {
 170                 LOG.debug("Skipping unmodified candidate {}", path);
 171                 return;
 172             }
 173             final Collection<ActorRef> regs = regNode.getRegistrations();
 174             if (!regs.isEmpty()) {
 175                 createCanCommits(regs, path, candNode);
 176             }
 177
 178             for (final DataTreeCandidateNode candChild : candNode.getChildNodes()) {
 179                 if (candChild.getModificationType() != ModificationType.UNMODIFIED) {
 180                     final RegistrationTreeNode<ActorRef> regChild =
 181                             regNode.getExactChild(candChild.getIdentifier());
 182                     if (regChild != null) {
 183                         lookupAndCreateCanCommits(path.node(candChild.getIdentifier()), regChild, candChild);
 184                     }
 185
 186                     for (final RegistrationTreeNode<ActorRef> rc : regNode
 187                             .getInexactChildren(candChild.getIdentifier())) {
 188                         lookupAndCreateCanCommits(path.node(candChild.getIdentifier()), rc, candChild);
 189                     }
 190                 }
 191             }
 192         }
 193
 194         private void createCanCommits(final Collection<ActorRef> regs, final YangInstanceIdentifier path,
 195                 final DataTreeCandidateNode node) {
 196             final DOMDataTreeCandidate candidate = DOMDataTreeCandidateTO.create(treeIdentifier(path), node);
 197             for (final ActorRef reg : regs) {
 198                 final CanCommit message = new DataTreeCohortActor.CanCommit(txId, candidate, schema, reg);
 199                 messages.add(message);
 200             }
 201         }
 202
 203         private static DOMDataTreeIdentifier treeIdentifier(final YangInstanceIdentifier path) {
 204             return new DOMDataTreeIdentifier(LogicalDatastoreType.CONFIGURATION, path);
 205         }
 206
 207         private Collection<DataTreeCohortActor.CanCommit> perform(final RegistrationTreeNode<ActorRef> rootNode) {
 208             final List<PathArgument> toLookup = candidate.getRootPath().getPathArguments();
 209             lookupAndCreateCanCommits(toLookup, 0, rootNode);
 210             return messages;
 211         }
 212     }
 213
 214     CompositeDataTreeCohort createCohort(final SchemaContext schemaContext, final TransactionIdentifier txId,
 215             final Timeout commitStepTimeout) {
 216         return new CompositeDataTreeCohort(this, txId, schemaContext, commitStepTimeout);
 217     }
 218 }