opendaylight/md-sal/sal-inmemory-datastore/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/InMemoryDOMStoreTreeChangePublisher.java

   1 /*
   2  * Copyright (c) 2014 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.md.sal.dom.store.impl;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.Collection;
  12 import java.util.Collections;
  13 import java.util.concurrent.ExecutorService;
  14 import javax.annotation.Nonnull;
  15 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  16 import org.opendaylight.controller.md.sal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration;
  17 import org.opendaylight.controller.sal.core.spi.data.AbstractDOMStoreTreeChangePublisher;
  18 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  19 import org.opendaylight.yangtools.util.concurrent.QueuedNotificationManager;
  20 import org.opendaylight.yangtools.util.concurrent.QueuedNotificationManager.Invoker;
  21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  23 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  24 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  25 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;
  26 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeSnapshot;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 final class InMemoryDOMStoreTreeChangePublisher extends AbstractDOMStoreTreeChangePublisher {
  31     private static final Invoker<AbstractDOMDataTreeChangeListenerRegistration<?>, DataTreeCandidate> MANAGER_INVOKER =
  32             (listener, notification) -> {
  33                 // FIXME: this is inefficient, as we could grab the entire queue for the listener and post it
  34                 final DOMDataTreeChangeListener inst = listener.getInstance();
  35                 if (inst != null) {
  36                     inst.onDataTreeChanged(Collections.singletonList(notification));
  37                 }
  38             };
  39     private static final Logger LOG = LoggerFactory.getLogger(InMemoryDOMStoreTreeChangePublisher.class);
  40     private final QueuedNotificationManager<AbstractDOMDataTreeChangeListenerRegistration<?>, DataTreeCandidate> notificationManager;
  41
  42     InMemoryDOMStoreTreeChangePublisher(final ExecutorService listenerExecutor, final int maxQueueSize) {
  43         notificationManager = new QueuedNotificationManager<>(listenerExecutor, MANAGER_INVOKER, maxQueueSize, "DataTreeChangeListenerQueueMgr");
  44     }
  45
  46     private InMemoryDOMStoreTreeChangePublisher(QueuedNotificationManager<
  47             AbstractDOMDataTreeChangeListenerRegistration<?>, DataTreeCandidate> notificationManager) {
  48         this.notificationManager = notificationManager;
  49     }
  50
  51     @Override
  52     protected void notifyListeners(final Collection<AbstractDOMDataTreeChangeListenerRegistration<?>> registrations, final YangInstanceIdentifier path, final DataTreeCandidateNode node) {
  53         final DataTreeCandidate candidate = DataTreeCandidates.newDataTreeCandidate(path, node);
  54
  55         for (AbstractDOMDataTreeChangeListenerRegistration<?> reg : registrations) {
  56             LOG.debug("Enqueueing candidate {} to registration {}", candidate, registrations);
  57             notificationManager.submitNotification(reg, candidate);
  58         }
  59     }
  60
  61     @Override
  62     protected synchronized void registrationRemoved(final AbstractDOMDataTreeChangeListenerRegistration<?> registration) {
  63         LOG.debug("Closing registration {}", registration);
  64
  65         // FIXME: remove the queue for this registration and make sure we clear it
  66     }
  67
  68     <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerTreeChangeListener(final YangInstanceIdentifier treeId, final L listener, final DataTreeSnapshot snapshot) {
  69         final AbstractDOMDataTreeChangeListenerRegistration<L> reg = registerTreeChangeListener(treeId, listener);
  70
  71         final Optional<NormalizedNode<?, ?>> node = snapshot.readNode(YangInstanceIdentifier.EMPTY);
  72         if (node.isPresent()) {
  73             final DataTreeCandidate candidate = DataTreeCandidates.fromNormalizedNode(
  74                     YangInstanceIdentifier.EMPTY, node.get());
  75
  76             InMemoryDOMStoreTreeChangePublisher publisher =
  77                     new InMemoryDOMStoreTreeChangePublisher(notificationManager);
  78             publisher.registerTreeChangeListener(treeId, listener);
  79             publisher.publishChange(candidate);
  80         }
  81
  82         return reg;
  83     }
  84
  85     synchronized void publishChange(@Nonnull final DataTreeCandidate candidate) {
  86         // Runs synchronized with registrationRemoved()
  87         processCandidateTree(candidate);
  88     }
  89 }