dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/ProducerLayout.java

   1 /*
   2  * Copyright (c) 2015 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.mdsal.dom.broker;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.collect.ArrayListMultimap;
  12 import com.google.common.collect.BiMap;
  13 import com.google.common.collect.ImmutableBiMap;
  14 import com.google.common.collect.ImmutableBiMap.Builder;
  15 import com.google.common.collect.ImmutableMap;
  16 import com.google.common.collect.Maps;
  17 import com.google.common.collect.Multimap;
  18 import java.util.ArrayList;
  19 import java.util.Collection;
  20 import java.util.Map;
  21 import java.util.Map.Entry;
  22 import java.util.Set;
  23 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  24 import org.opendaylight.mdsal.dom.api.DOMDataTreeProducer;
  25 import org.opendaylight.mdsal.dom.api.DOMDataTreeShard;
  26 import org.opendaylight.mdsal.dom.store.inmemory.DOMDataTreeShardProducer;
  27 import org.opendaylight.mdsal.dom.store.inmemory.DOMDataTreeShardWriteTransaction;
  28 import org.opendaylight.mdsal.dom.store.inmemory.WriteableDOMDataTreeShard;
  29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 final class ProducerLayout {
  35     private static final Logger LOG = LoggerFactory.getLogger(ProducerLayout.class);
  36
  37     private final BiMap<DOMDataTreeIdentifier, DOMDataTreeShardProducer> idToProducer;
  38     private final Map<DOMDataTreeIdentifier, DOMDataTreeProducer> children;
  39     private final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap;
  40
  41     private ProducerLayout(final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap,
  42             final BiMap<DOMDataTreeIdentifier, DOMDataTreeShardProducer> idToProducer,
  43             final Map<DOMDataTreeIdentifier, DOMDataTreeProducer> children) {
  44         this.shardMap = ImmutableMap.copyOf(shardMap);
  45         this.idToProducer = Preconditions.checkNotNull(idToProducer);
  46         this.children = Preconditions.checkNotNull(children);
  47     }
  48
  49     static ProducerLayout create(final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap) {
  50         return new ProducerLayout(shardMap, mapIdsToProducer(shardMap), ImmutableMap.of());
  51     }
  52
  53     private static BiMap<DOMDataTreeIdentifier, DOMDataTreeShardProducer> mapIdsToProducer(
  54             final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap) {
  55         final Multimap<DOMDataTreeShard, DOMDataTreeIdentifier> shardToId = ArrayListMultimap.create();
  56         // map which identifier belongs to which shard
  57         for (final Entry<DOMDataTreeIdentifier, DOMDataTreeShard> entry : shardMap.entrySet()) {
  58             shardToId.put(entry.getValue(), entry.getKey());
  59         }
  60
  61         final Builder<DOMDataTreeIdentifier, DOMDataTreeShardProducer> idToProducerBuilder = ImmutableBiMap.builder();
  62         for (final Entry<DOMDataTreeShard, Collection<DOMDataTreeIdentifier>> entry : shardToId.asMap().entrySet()) {
  63             if (entry.getKey() instanceof WriteableDOMDataTreeShard) {
  64                 //create a single producer for all prefixes in a single shard
  65                 final DOMDataTreeShardProducer producer = ((WriteableDOMDataTreeShard) entry.getKey())
  66                         .createProducer(entry.getValue());
  67                 // id mapped to producers
  68                 for (final DOMDataTreeIdentifier id : entry.getValue()) {
  69                     idToProducerBuilder.put(id, producer);
  70                 }
  71             } else {
  72                 LOG.error("Unable to create a producer for shard that's not a WriteableDOMDataTreeShard");
  73             }
  74         }
  75
  76         return idToProducerBuilder.build();
  77     }
  78
  79     ProducerLayout addChild(final DOMDataTreeProducer producer, final Collection<DOMDataTreeIdentifier> subtrees) {
  80         final ImmutableMap.Builder<DOMDataTreeIdentifier, DOMDataTreeProducer> cb = ImmutableMap.builder();
  81         cb.putAll(children);
  82         for (final DOMDataTreeIdentifier s : subtrees) {
  83             cb.put(s, producer);
  84         }
  85
  86         return new ProducerLayout(shardMap, idToProducer, cb.build());
  87     }
  88
  89     ProducerLayout reshard(final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap) {
  90         return new ProducerLayout(shardMap, mapIdsToProducer(shardMap), children);
  91     }
  92
  93     boolean haveSubtree(final DOMDataTreeIdentifier subtree) {
  94         for (final DOMDataTreeIdentifier i : shardMap.keySet()) {
  95             if (i.contains(subtree)) {
  96                 return true;
  97             }
  98         }
  99
 100         return false;
 101     }
 102
 103     DOMDataTreeProducer lookupChild(final DOMDataTreeIdentifier path) {
 104         for (final Entry<DOMDataTreeIdentifier, DOMDataTreeProducer> e : children.entrySet()) {
 105             if (e.getKey().contains(path)) {
 106                 // FIXME: does this match wildcards?
 107                 return e.getValue();
 108             }
 109         }
 110
 111         return null;
 112     }
 113
 114     Set<DOMDataTreeIdentifier> getChildTrees() {
 115         return children.keySet();
 116     }
 117
 118     void checkAvailable(final Collection<PathArgument> base, final PathArgument child) {
 119         if (!children.isEmpty()) {
 120             final Collection<PathArgument> args = new ArrayList<>(base.size() + 1);
 121             args.addAll(base);
 122             args.add(child);
 123
 124             final YangInstanceIdentifier path = YangInstanceIdentifier.create(args);
 125             for (final DOMDataTreeIdentifier c : children.keySet()) {
 126                 Preconditions.checkArgument(!c.getRootIdentifier().contains(path),
 127                     "Path {%s} is not available to this cursor since it's already claimed by a child producer", path);
 128             }
 129         }
 130     }
 131
 132     Map<DOMDataTreeIdentifier, DOMDataTreeShardWriteTransaction> createTransactions() {
 133         return Maps.transformValues(idToProducer, DOMDataTreeShardProducer::createTransaction);
 134     }
 135 }