dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/ShardedDOMDataTreeListenerContext.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.Optional;
  11 import com.google.common.base.Preconditions;
  12 import java.util.ArrayList;
  13 import java.util.Collection;
  14 import java.util.Collections;
  15 import java.util.EnumMap;
  16 import java.util.Map;
  17 import javax.annotation.concurrent.GuardedBy;
  18 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  19 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
  20 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  21 import org.opendaylight.mdsal.dom.api.DOMDataTreeListener;
  22 import org.opendaylight.mdsal.dom.spi.store.DOMStoreTreeChangePublisher;
  23 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  24 import org.opendaylight.yangtools.util.MapAdaptor;
  25 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  26 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  27
  28 class ShardedDOMDataTreeListenerContext<T extends DOMDataTreeListener> implements AutoCloseable {
  29
  30     private final DOMDataTreeListener listener;
  31     private final EnumMap<LogicalDatastoreType, StoreListener> storeListeners = new EnumMap<>(
  32             LogicalDatastoreType.class);
  33     private final Collection<ListenerRegistration<?>> registrations = new ArrayList<>();
  34
  35     // FIXME: Probably should be encapsulated into state object
  36     @GuardedBy("this")
  37     private Collection<DataTreeCandidate> unreported = new ArrayList<>();
  38     @GuardedBy("this")
  39     private Map<DOMDataTreeIdentifier, NormalizedNode<?, ?>> currentData = Collections.emptyMap();
  40
  41     private ShardedDOMDataTreeListenerContext(T listener) {
  42         for (LogicalDatastoreType type : LogicalDatastoreType.values()) {
  43             storeListeners.put(type, new StoreListener(type));
  44         }
  45         this.listener = Preconditions.checkNotNull(listener, "listener");
  46     }
  47
  48     static <T extends DOMDataTreeListener> ShardedDOMDataTreeListenerContext<T> create(final T listener) {
  49         return new ShardedDOMDataTreeListenerContext<>(listener);
  50     }
  51
  52     synchronized void notifyListener() {
  53         Collection<DataTreeCandidate> changesToNotify = unreported;
  54         unreported = new ArrayList<>();
  55         listener.onDataTreeChanged(changesToNotify, currentData);
  56     }
  57
  58     void register(DOMDataTreeIdentifier subtree, DOMStoreTreeChangePublisher shard) {
  59         ListenerRegistration<?> storeReg =
  60                 shard.registerTreeChangeListener(subtree.getRootIdentifier(),
  61                         storeListeners.get(subtree.getDatastoreType()));
  62         registrations.add(storeReg);
  63     }
  64
  65     private final class StoreListener implements DOMDataTreeChangeListener {
  66
  67         private final LogicalDatastoreType type;
  68
  69         StoreListener(LogicalDatastoreType type) {
  70             this.type = type;
  71         }
  72
  73         @Override
  74         public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
  75             receivedDataTreeChanges(type, changes);
  76             scheduleNotification();
  77         }
  78
  79     }
  80
  81     // FIXME: Should be able to run parallel to notifyListener and should honor
  82     // allowRxMerges
  83     synchronized void receivedDataTreeChanges(LogicalDatastoreType type, Collection<DataTreeCandidate> changes) {
  84         Map<DOMDataTreeIdentifier, NormalizedNode<?, ?>> updatedData =
  85                 MapAdaptor.getDefaultInstance().takeSnapshot(currentData);
  86         for (DataTreeCandidate change : changes) {
  87             // FIXME: Make sure only one is reported / merged
  88             unreported.add(change);
  89             DOMDataTreeIdentifier treeId = new DOMDataTreeIdentifier(type, change.getRootPath());
  90             // FIXME: Probably we should apply data tree candidate to previously observed state
  91             Optional<NormalizedNode<?, ?>> dataAfter = change.getRootNode().getDataAfter();
  92             if (dataAfter.isPresent()) {
  93                 updatedData.put(treeId, dataAfter.get());
  94             } else {
  95                 updatedData.remove(treeId);
  96             }
  97         }
  98         currentData = MapAdaptor.getDefaultInstance().optimize(updatedData);
  99     }
 100
 101     void scheduleNotification() {
 102         // FIXME: This callout should schedule delivery task
 103         notifyListener();
 104     }
 105
 106     @Override
 107     public void close() {
 108         for (ListenerRegistration<?> reg : registrations) {
 109             reg.close();
 110         }
 111     }
 112
 113     DOMDataTreeListener getListener() {
 114         return listener;
 115     }
 116 }