opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/FrontendMetadata.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.collect.Collections2;
  11 import java.util.HashMap;
  12 import java.util.Map;
  13 import javax.annotation.concurrent.NotThreadSafe;
  14 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
  15 import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
  16 import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
  17 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
  18 import org.opendaylight.controller.cluster.datastore.persisted.FrontendClientMetadata;
  19 import org.opendaylight.controller.cluster.datastore.persisted.FrontendShardDataTreeSnapshotMetadata;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 /**
  24  * Frontend state as observed by a shard follower. This class is responsible for maintaining metadata state
  25  * so that this can be used to seed {@link LeaderFrontendState} with proper state so that the frontend/backend
  26  * conversation can continue where it left off.
  27  *
  28  * @author Robert Varga
  29  */
  30 @NotThreadSafe
  31 final class FrontendMetadata extends ShardDataTreeMetadata<FrontendShardDataTreeSnapshotMetadata> {
  32     private static final Logger LOG = LoggerFactory.getLogger(FrontendMetadata.class);
  33
  34     private final Map<FrontendIdentifier, FrontendClientMetadataBuilder> clients = new HashMap<>();
  35
  36     @Override
  37     Class<FrontendShardDataTreeSnapshotMetadata> getSupportedType() {
  38         return FrontendShardDataTreeSnapshotMetadata.class;
  39     }
  40
  41     @Override
  42     void reset() {
  43         clients.clear();
  44     }
  45
  46     @Override
  47     void doApplySnapshot(final FrontendShardDataTreeSnapshotMetadata snapshot) {
  48         clients.clear();
  49
  50         for (FrontendClientMetadata m : snapshot.getClients()) {
  51             clients.put(m.getIdentifier().getFrontendId(), new FrontendClientMetadataBuilder(m));
  52         }
  53     }
  54
  55     @Override
  56     FrontendShardDataTreeSnapshotMetadata toSnapshot() {
  57         return new FrontendShardDataTreeSnapshotMetadata(Collections2.transform(clients.values(),
  58             FrontendClientMetadataBuilder::build));
  59     }
  60
  61     private FrontendClientMetadataBuilder ensureClient(final ClientIdentifier id) {
  62         final FrontendClientMetadataBuilder existing = clients.get(id.getFrontendId());
  63         if (existing != null && id.equals(existing.getIdentifier())) {
  64             return existing;
  65         }
  66
  67         final FrontendClientMetadataBuilder client = new FrontendClientMetadataBuilder(id);
  68         final FrontendClientMetadataBuilder previous = clients.put(id.getFrontendId(), client);
  69         if (previous != null) {
  70             LOG.debug("Replaced client {} with {}", previous, client);
  71         } else {
  72             LOG.debug("Added client {}", client);
  73         }
  74         return client;
  75     }
  76
  77     @Override
  78     void onHistoryClosed(final LocalHistoryIdentifier historyId) {
  79         ensureClient(historyId.getClientId()).onHistoryClosed(historyId);
  80     }
  81
  82     @Override
  83     void onHistoryPurged(final LocalHistoryIdentifier historyId) {
  84         ensureClient(historyId.getClientId()).onHistoryPurged(historyId);
  85     }
  86
  87     @Override
  88     void onTransactionCommitted(final TransactionIdentifier txId) {
  89         ensureClient(txId.getHistoryId().getClientId()).onTransactionCommitted(txId);
  90     }
  91 }