dom/mdsal-dom-spi/src/main/java/org/opendaylight/mdsal/dom/spi/shard/CompatDOMDataTreeListenerRegistry.java

   1 /*
   2  * Copyright (c) 2017 Pantheon Technologies, s.ro. 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.spi.shard;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.annotations.Beta;
  13 import com.google.common.base.Optional;
  14 import com.google.common.collect.ImmutableMap;
  15 import com.google.common.collect.Iterables;
  16 import java.util.ArrayList;
  17 import java.util.Collection;
  18 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  19 import org.opendaylight.mdsal.dom.api.DOMDataTreeListener;
  20 import org.opendaylight.mdsal.dom.spi.store.DOMStoreTreeChangePublisher;
  21 import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
  22 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  24
  25 /**
  26  * Compatibility bridge between {@link DOMDataTreeListenerRegistry} and {@link DOMStoreTreeChangePublisher}.
  27  */
  28 @Beta
  29 @Deprecated
  30 public final class CompatDOMDataTreeListenerRegistry implements DOMDataTreeListenerRegistry {
  31
  32     private final DOMStoreTreeChangePublisher publisher;
  33
  34     public CompatDOMDataTreeListenerRegistry(final DOMStoreTreeChangePublisher publisher) {
  35         this.publisher = requireNonNull(publisher);
  36     }
  37
  38     @Override
  39     public <T extends DOMDataTreeListener> ListenerRegistration<T> registerListener(final T listener,
  40             final Collection<DOMDataTreeIdentifier> subtrees, final boolean allowRxMerges) {
  41         if (subtrees.size() == 1) {
  42             final DOMDataTreeIdentifier treeId = Iterables.getOnlyElement(subtrees);
  43
  44             final ListenerRegistration<?> reg = publisher.registerTreeChangeListener(treeId.getRootIdentifier(),
  45                 changes -> {
  46                     final Optional<NormalizedNode<?, ?>> last = Iterables.getLast(changes).getRootNode().getDataAfter();
  47                     if (last.isPresent()) {
  48                         listener.onDataTreeChanged(changes, ImmutableMap.of(treeId, last.get()));
  49                     } else {
  50                         listener.onDataTreeChanged(changes, ImmutableMap.of());
  51                     }
  52                 });
  53             return new AbstractListenerRegistration<T>(listener) {
  54                 @Override
  55                 protected void removeRegistration() {
  56                     reg.close();
  57                 }
  58             };
  59         }
  60
  61         final int size = subtrees.size();
  62         final Collection<ListenerRegistration<?>> regs = new ArrayList<>(size);
  63         final DOMDataTreeChangeListenerAggregator aggregator = new DOMDataTreeChangeListenerAggregator(size,
  64             allowRxMerges);
  65         for (DOMDataTreeIdentifier treeId : subtrees) {
  66             regs.add(publisher.registerTreeChangeListener(treeId.getRootIdentifier(),
  67                 aggregator.createListener(treeId)));
  68         }
  69
  70         return aggregator.start(listener, regs);
  71     }
  72 }