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     @SuppressWarnings("checkstyle:IllegalCatch")
  57     void registerCohort(final ActorRef sender, final RegisterCohort cohort) {
  58         takeLock();
  59         try {
  60             final ActorRef cohortRef = cohort.getCohort();
  61             final RegistrationTreeNode<ActorRef> node =
  62                     findNodeFor(cohort.getPath().getRootIdentifier().getPathArguments());
  63             addRegistration(node, cohort.getCohort());
  64             cohortToNode.put(cohortRef, node);
  65         } catch (final Exception e) {
  66             sender.tell(new Status.Failure(e), ActorRef.noSender());
  67             return;
  68         } finally {
  69             releaseLock();
  70         }
  71         sender.tell(new Status.Success(null), ActorRef.noSender());
  72     }
  73
  74     void removeCommitCohort(final ActorRef sender, final RemoveCohort message) {
  75         final ActorRef cohort = message.getCohort();
  76         final RegistrationTreeNode<ActorRef> node = cohortToNode.get(cohort);
  77         if (node != null) {
  78             removeRegistration(node, cohort);
  79             cohortToNode.remove(cohort);
  80         }
  81         sender.tell(new Status.Success(null), ActorRef.noSender());
  82         cohort.tell(PoisonPill.getInstance(), cohort);
  83     }
  84
  85     Collection<DataTreeCohortActor.CanCommit> createCanCommitMessages(final TransactionIdentifier txId,
  86             final DataTreeCandidate candidate, final SchemaContext schema) {
  87         try (RegistrationTreeSnapshot<ActorRef> cohorts = takeSnapshot()) {
  88             return new CanCommitMessageBuilder(txId, candidate, schema).perform(cohorts.getRootNode());
  89         }
  90     }
  91
  92     void process(final ActorRef sender, final CohortRegistryCommand message) {
  93         if (message instanceof RegisterCohort) {
  94             registerCohort(sender, (RegisterCohort) message);
  95         } else if (message instanceof RemoveCohort) {
  96             removeCommitCohort(sender, (RemoveCohort) message);
  97         }
  98     }
  99
 100     abstract static class CohortRegistryCommand {
 101
 102         private final ActorRef cohort;
 103
 104         CohortRegistryCommand(final ActorRef cohort) {
 105             this.cohort = Preconditions.checkNotNull(cohort);
 106         }
 107
 108         ActorRef getCohort() {
 109             return cohort;
 110         }
 111     }
 112
 113     static class RegisterCohort extends CohortRegistryCommand {
 114
 115         private final DOMDataTreeIdentifier path;
 116
 117         RegisterCohort(final DOMDataTreeIdentifier path, final ActorRef cohort) {
 118             super(cohort);
 119             this.path = path;
 120
 121         }
 122
 123         public DOMDataTreeIdentifier getPath() {
 124             return path;
 125         }
 126
 127     }
 128
 129     static class RemoveCohort extends CohortRegistryCommand {
 130
 131         RemoveCohort(final ActorRef cohort) {
 132             super(cohort);
 133         }
 134
 135     }
 136
 137     private static class CanCommitMessageBuilder {
 138
 139         private final TransactionIdentifier txId;
 140         private final DataTreeCandidate candidate;
 141         private final SchemaContext schema;
 142         private final Collection<DataTreeCohortActor.CanCommit> messages =
 143                 new ArrayList<>();
 144
 145         CanCommitMessageBuilder(final TransactionIdentifier txId, final DataTreeCandidate candidate,
 146                 final SchemaContext schema) {
 147             this.txId = Preconditions.checkNotNull(txId);
 148             this.candidate = Preconditions.checkNotNull(candidate);
 149             this.schema = schema;
 150         }
 151
 152         private void lookupAndCreateCanCommits(final List<PathArgument> args, final int offset,
 153                 final RegistrationTreeNode<ActorRef> node) {
 154
 155             if (args.size() != offset) {
 156                 final PathArgument arg = args.get(offset);
 157                 final RegistrationTreeNode<ActorRef> exactChild = node.getExactChild(arg);
 158                 if (exactChild != null) {
 159                     lookupAndCreateCanCommits(args, offset + 1, exactChild);
 160                 }
 161                 for (final RegistrationTreeNode<ActorRef> c : node.getInexactChildren(arg)) {
 162                     lookupAndCreateCanCommits(args, offset + 1, c);
 163                 }
 164             } else {
 165                 lookupAndCreateCanCommits(candidate.getRootPath(), node, candidate.getRootNode());
 166             }
 167         }
 168
 169         private void lookupAndCreateCanCommits(final YangInstanceIdentifier path,
 170                 final RegistrationTreeNode<ActorRef> regNode, final DataTreeCandidateNode candNode) {
 171             if (candNode.getModificationType() == ModificationType.UNMODIFIED) {
 172                 LOG.debug("Skipping unmodified candidate {}", path);
 173                 return;
 174             }
 175             final Collection<ActorRef> regs = regNode.getRegistrations();
 176             if (!regs.isEmpty()) {
 177                 createCanCommits(regs, path, candNode);
 178             }
 179
 180             for (final DataTreeCandidateNode candChild : candNode.getChildNodes()) {
 181                 if (candChild.getModificationType() != ModificationType.UNMODIFIED) {
 182                     final RegistrationTreeNode<ActorRef> regChild =
 183                             regNode.getExactChild(candChild.getIdentifier());
 184                     if (regChild != null) {
 185                         lookupAndCreateCanCommits(path.node(candChild.getIdentifier()), regChild, candChild);
 186                     }
 187
 188                     for (final RegistrationTreeNode<ActorRef> rc : regNode
 189                             .getInexactChildren(candChild.getIdentifier())) {
 190                         lookupAndCreateCanCommits(path.node(candChild.getIdentifier()), rc, candChild);
 191                     }
 192                 }
 193             }
 194         }
 195
 196         private void createCanCommits(final Collection<ActorRef> regs, final YangInstanceIdentifier path,
 197                 final DataTreeCandidateNode node) {
 198             final DOMDataTreeCandidate domCandidate = DOMDataTreeCandidateTO.create(treeIdentifier(path), node);
 199             for (final ActorRef reg : regs) {
 200                 final CanCommit message = new DataTreeCohortActor.CanCommit(txId, domCandidate, schema, reg);
 201                 messages.add(message);
 202             }
 203         }
 204
 205         private static DOMDataTreeIdentifier treeIdentifier(final YangInstanceIdentifier path) {
 206             return new DOMDataTreeIdentifier(LogicalDatastoreType.CONFIGURATION, path);
 207         }
 208
 209         private Collection<DataTreeCohortActor.CanCommit> perform(final RegistrationTreeNode<ActorRef> rootNode) {
 210             final List<PathArgument> toLookup = candidate.getRootPath().getPathArguments();
 211             lookupAndCreateCanCommits(toLookup, 0, rootNode);
 212             return messages;
 213         }
 214     }
 215
 216     CompositeDataTreeCohort createCohort(final SchemaContext schemaContext, final TransactionIdentifier txId,
 217             final Timeout commitStepTimeout) {
 218         return new CompositeDataTreeCohort(this, txId, schemaContext, commitStepTimeout);
 219     }
 220 }