opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/FrontendHistoryMetadataBuilder.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 package org.opendaylight.controller.cluster.datastore;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.collect.Range;
  12 import com.google.common.collect.RangeSet;
  13 import com.google.common.collect.TreeRangeSet;
  14 import com.google.common.primitives.UnsignedLong;
  15 import java.util.HashMap;
  16 import java.util.Map;
  17 import javax.annotation.Nonnull;
  18 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
  19 import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
  20 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  21 import org.opendaylight.controller.cluster.datastore.persisted.FrontendHistoryMetadata;
  22 import org.opendaylight.yangtools.concepts.Builder;
  23 import org.opendaylight.yangtools.concepts.Identifiable;
  24
  25 final class FrontendHistoryMetadataBuilder implements Builder<FrontendHistoryMetadata>,
  26         Identifiable<LocalHistoryIdentifier> {
  27
  28     private final Map<UnsignedLong, Boolean> closedTransactions;
  29     private final RangeSet<UnsignedLong> purgedTransactions;
  30     private final LocalHistoryIdentifier identifier;
  31
  32     private boolean closed;
  33
  34     FrontendHistoryMetadataBuilder(final LocalHistoryIdentifier identifier) {
  35         this.identifier = Preconditions.checkNotNull(identifier);
  36         this.purgedTransactions = TreeRangeSet.create();
  37         this.closedTransactions = new HashMap<>(2);
  38     }
  39
  40     FrontendHistoryMetadataBuilder(final ClientIdentifier clientId, final FrontendHistoryMetadata meta) {
  41         identifier = new LocalHistoryIdentifier(clientId, meta.getHistoryId(), meta.getCookie());
  42         closedTransactions = new HashMap<>(meta.getClosedTransactions());
  43         purgedTransactions = TreeRangeSet.create(meta.getPurgedTransactions());
  44         closed = meta.isClosed();
  45     }
  46
  47     @Override
  48     public LocalHistoryIdentifier getIdentifier() {
  49         return identifier;
  50     }
  51
  52     @Override
  53     public FrontendHistoryMetadata build() {
  54         return new FrontendHistoryMetadata(identifier.getHistoryId(), identifier.getCookie(), closed,
  55             closedTransactions, purgedTransactions);
  56     }
  57
  58     void onHistoryClosed() {
  59         Preconditions.checkState(identifier.getHistoryId() != 0);
  60         closed = true;
  61     }
  62
  63     void onTransactionAborted(final TransactionIdentifier txId) {
  64         closedTransactions.put(UnsignedLong.fromLongBits(txId.getTransactionId()), Boolean.FALSE);
  65     }
  66
  67     void onTransactionCommitted(final TransactionIdentifier txId) {
  68         closedTransactions.put(UnsignedLong.fromLongBits(txId.getTransactionId()), Boolean.TRUE);
  69     }
  70
  71     void onTransactionPurged(final TransactionIdentifier txId) {
  72         final UnsignedLong id = UnsignedLong.fromLongBits(txId.getTransactionId());
  73         closedTransactions.remove(id);
  74         purgedTransactions.add(Range.singleton(id));
  75     }
  76
  77     /**
  78      * Transform frontend metadata for a particular client history into its {@link LocalFrontendHistory} counterpart.
  79      *
  80      * @param shard parent shard
  81      * @return Leader history state
  82      */
  83     @Nonnull AbstractFrontendHistory toLeaderState(@Nonnull final Shard shard) {
  84         if (identifier.getHistoryId() == 0) {
  85             return StandaloneFrontendHistory.recreate(shard.persistenceId(), identifier.getClientId(),
  86                 shard.getDataStore(), closedTransactions, purgedTransactions);
  87         }
  88
  89         return LocalFrontendHistory.recreate(shard.persistenceId(), shard.getDataStore(),
  90             shard.getDataStore().recreateTransactionChain(identifier, closed), closedTransactions, purgedTransactions);
  91     }
  92 }