dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/ShardedDOMDataTreeProducer.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.ImmutableSet;
  17 import com.google.common.collect.Multimap;
  18 import java.util.Collection;
  19 import java.util.Collections;
  20 import java.util.Map;
  21 import java.util.Map.Entry;
  22 import java.util.Set;
  23 import javax.annotation.concurrent.GuardedBy;
  24 import org.opendaylight.mdsal.dom.api.DOMDataTreeCursorAwareTransaction;
  25 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  26 import org.opendaylight.mdsal.dom.api.DOMDataTreeProducer;
  27 import org.opendaylight.mdsal.dom.api.DOMDataTreeProducerBusyException;
  28 import org.opendaylight.mdsal.dom.api.DOMDataTreeProducerException;
  29 import org.opendaylight.mdsal.dom.api.DOMDataTreeShard;
  30 import org.opendaylight.mdsal.dom.store.inmemory.DOMDataTreeShardProducer;
  31 import org.opendaylight.mdsal.dom.store.inmemory.WriteableDOMDataTreeShard;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 class ShardedDOMDataTreeProducer implements DOMDataTreeProducer {
  36     private static final Logger LOG = LoggerFactory.getLogger(ShardedDOMDataTreeProducer.class);
  37     private final Set<DOMDataTreeIdentifier> subtrees;
  38     private final ShardedDOMDataTree dataTree;
  39
  40     private BiMap<DOMDataTreeIdentifier, DOMDataTreeShardProducer> idToProducer = ImmutableBiMap.of();
  41     private Map<DOMDataTreeIdentifier, DOMDataTreeShard> idToShard;
  42
  43     @GuardedBy("this")
  44     private DOMDataTreeCursorAwareTransaction openTx;
  45     @GuardedBy("this")
  46     private Map<DOMDataTreeIdentifier, DOMDataTreeProducer> children = Collections.emptyMap();
  47     @GuardedBy("this")
  48     private boolean closed;
  49
  50     @GuardedBy("this")
  51     private ShardedDOMDataTreeListenerContext<?> attachedListener;
  52
  53     ShardedDOMDataTreeProducer(final ShardedDOMDataTree dataTree,
  54                                final Collection<DOMDataTreeIdentifier> subtrees,
  55                                final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap,
  56                                final Multimap<DOMDataTreeShard, DOMDataTreeIdentifier> shardToId) {
  57         this.dataTree = Preconditions.checkNotNull(dataTree);
  58         if (!shardToId.isEmpty()) {
  59             this.idToProducer = mapIdsToProducer(shardToId);
  60         }
  61         idToShard = ImmutableMap.copyOf(shardMap);
  62         this.subtrees = ImmutableSet.copyOf(subtrees);
  63     }
  64
  65     static DOMDataTreeProducer create(final ShardedDOMDataTree dataTree,
  66                                       final Collection<DOMDataTreeIdentifier> subtrees,
  67                                       final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap) {
  68         final Multimap<DOMDataTreeShard, DOMDataTreeIdentifier> shardToIdentifiers = ArrayListMultimap.create();
  69         // map which identifier belongs to which shard
  70         for (final Entry<DOMDataTreeIdentifier, DOMDataTreeShard> entry : shardMap.entrySet()) {
  71             shardToIdentifiers.put(entry.getValue(), entry.getKey());
  72         }
  73
  74         return new ShardedDOMDataTreeProducer(dataTree, subtrees, shardMap, shardToIdentifiers);
  75     }
  76
  77     void subshardAdded(final Map<DOMDataTreeIdentifier, DOMDataTreeShard> shardMap) {
  78         Preconditions.checkState(openTx == null, "Transaction %s is still open", openTx);
  79         final Multimap<DOMDataTreeShard, DOMDataTreeIdentifier> shardToIdentifiers = ArrayListMultimap.create();
  80         // map which identifier belongs to which shard
  81         for (final Entry<DOMDataTreeIdentifier, DOMDataTreeShard> entry : shardMap.entrySet()) {
  82             shardToIdentifiers.put(entry.getValue(), entry.getKey());
  83         }
  84         this.idToProducer = mapIdsToProducer(shardToIdentifiers);
  85         idToShard = ImmutableMap.copyOf(shardMap);
  86     }
  87
  88     private BiMap<DOMDataTreeIdentifier, DOMDataTreeShardProducer> mapIdsToProducer(final Multimap<DOMDataTreeShard, DOMDataTreeIdentifier> shardToId) {
  89         final Builder<DOMDataTreeIdentifier, DOMDataTreeShardProducer> idToProducerBuilder = ImmutableBiMap.builder();
  90         for (final Entry<DOMDataTreeShard, Collection<DOMDataTreeIdentifier>> entry : shardToId.asMap().entrySet()) {
  91             if (entry.getKey() instanceof WriteableDOMDataTreeShard) {
  92                 //create a single producer for all prefixes in a single shard
  93                 final DOMDataTreeShardProducer producer = ((WriteableDOMDataTreeShard) entry.getKey()).createProducer(entry.getValue());
  94                 // id mapped to producers
  95                 for (final DOMDataTreeIdentifier id : entry.getValue()) {
  96                     idToProducerBuilder.put(id, producer);
  97                 }
  98             } else {
  99                 LOG.error("Unable to create a producer for shard that's not a WriteableDOMDataTreeShard");
 100             }
 101         }
 102
 103         return idToProducerBuilder.build();
 104     }
 105
 106     @Override
 107     public synchronized DOMDataTreeCursorAwareTransaction createTransaction(final boolean isolated) {
 108         Preconditions.checkState(!closed, "Producer is already closed");
 109         Preconditions.checkState(openTx == null, "Transaction %s is still open", openTx);
 110
 111         this.openTx = new ShardedDOMDataTreeWriteTransaction(this, idToProducer, children);
 112
 113         return openTx;
 114     }
 115
 116     @GuardedBy("this")
 117     private boolean haveSubtree(final DOMDataTreeIdentifier subtree) {
 118         for (final DOMDataTreeIdentifier i : idToShard.keySet()) {
 119             if (i.contains(subtree)) {
 120                 return true;
 121             }
 122         }
 123
 124         return false;
 125     }
 126
 127     @GuardedBy("this")
 128     private DOMDataTreeProducer lookupChild(final DOMDataTreeIdentifier s) {
 129         for (final Entry<DOMDataTreeIdentifier, DOMDataTreeProducer> e : children.entrySet()) {
 130             if (e.getKey().contains(s)) {
 131                 return e.getValue();
 132             }
 133         }
 134
 135         return null;
 136     }
 137
 138     @Override
 139     public synchronized DOMDataTreeProducer createProducer(final Collection<DOMDataTreeIdentifier> subtrees) {
 140         Preconditions.checkState(!closed, "Producer is already closed");
 141         Preconditions.checkState(openTx == null, "Transaction %s is still open", openTx);
 142
 143         for (final DOMDataTreeIdentifier s : subtrees) {
 144             // Check if the subtree was visible at any time
 145             Preconditions.checkArgument(haveSubtree(s), "Subtree %s was never available in producer %s", s, this);
 146             // Check if the subtree has not been delegated to a child
 147             final DOMDataTreeProducer child = lookupChild(s);
 148             Preconditions.checkArgument(child == null, "Subtree %s is delegated to child producer %s", s, child);
 149
 150             // Check if part of the requested subtree is not delegated to a child.
 151             for (final DOMDataTreeIdentifier c : children.keySet()) {
 152                 if (s.contains(c)) {
 153                     throw new IllegalArgumentException(String.format("Subtree %s cannot be delegated as it is superset of already-delegated %s", s, c));
 154                 }
 155             }
 156         }
 157
 158         final DOMDataTreeProducer ret = dataTree.createProducer(this, subtrees);
 159         final ImmutableMap.Builder<DOMDataTreeIdentifier, DOMDataTreeProducer> cb = ImmutableMap.builder();
 160         cb.putAll(children);
 161         for (final DOMDataTreeIdentifier s : subtrees) {
 162             cb.put(s, ret);
 163         }
 164
 165         children = cb.build();
 166         return ret;
 167     }
 168
 169     boolean isDelegatedToChild(final DOMDataTreeIdentifier path) {
 170         for (final DOMDataTreeIdentifier c : children.keySet()) {
 171             if (c.contains(path)) {
 172                 return true;
 173             }
 174         }
 175         return false;
 176     }
 177
 178
 179     @Override
 180     public synchronized void close() throws DOMDataTreeProducerException {
 181         if (!closed) {
 182             if (openTx != null) {
 183                 throw new DOMDataTreeProducerBusyException(String.format("Transaction %s is still open", openTx));
 184             }
 185
 186             closed = true;
 187             dataTree.destroyProducer(this);
 188         }
 189     }
 190
 191     protected Set<DOMDataTreeIdentifier> getSubtrees() {
 192         return subtrees;
 193     }
 194
 195     synchronized void cancelTransaction(final ShardedDOMDataTreeWriteTransaction transaction) {
 196         if (!openTx.equals(transaction)) {
 197             LOG.warn("Transaction {} is not open in producer {}", transaction, this);
 198             return;
 199         }
 200
 201         LOG.debug("Transaction {} cancelled", transaction);
 202         openTx = null;
 203     }
 204
 205     synchronized void transactionSubmitted(final ShardedDOMDataTreeWriteTransaction transaction) {
 206         Preconditions.checkState(openTx.equals(transaction));
 207         openTx = null;
 208     }
 209
 210     synchronized void boundToListener(final ShardedDOMDataTreeListenerContext<?> listener) {
 211         // FIXME: Add option to dettach
 212         Preconditions.checkState(this.attachedListener == null,
 213                 "Producer %s is already attached to other listener.",
 214                 listener.getListener());
 215         this.attachedListener = listener;
 216     }
 217 }