opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DefaultShardDataTreeChangeListenerPublisher.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.controller.cluster.datastore;
   9
  10 import com.google.common.base.Optional;
  11 import java.util.Collection;
  12 import java.util.function.Consumer;
  13 import javax.annotation.concurrent.NotThreadSafe;
  14 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  15 import org.opendaylight.mdsal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration;
  16 import org.opendaylight.mdsal.dom.spi.store.AbstractDOMStoreTreeChangePublisher;
  17 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  19 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 /**
  24  * Default implementation of ShardDataTreeChangeListenerPublisher that directly generates and publishes
  25  * notifications for DataTreeChangeListeners.
  26  *
  27  * @author Thomas Pantelis
  28  */
  29 @NotThreadSafe
  30 final class DefaultShardDataTreeChangeListenerPublisher extends AbstractDOMStoreTreeChangePublisher
  31         implements ShardDataTreeChangeListenerPublisher {
  32     private static final Logger LOG = LoggerFactory.getLogger(DefaultShardDataTreeChangeListenerPublisher.class);
  33     private String logContext;
  34
  35     DefaultShardDataTreeChangeListenerPublisher(String logContext) {
  36         this.logContext = logContext;
  37     }
  38
  39     @Override
  40     public void publishChanges(final DataTreeCandidate candidate) {
  41         LOG.debug("{}: publishChanges: {}", logContext, candidate);
  42         processCandidateTree(candidate);
  43     }
  44
  45     @Override
  46     protected void notifyListener(AbstractDOMDataTreeChangeListenerRegistration<?> registration,
  47             Collection<DataTreeCandidate> changes) {
  48         LOG.debug("{}: notifyListener: listener: {}", logContext, registration.getInstance());
  49         registration.getInstance().onDataTreeChanged(changes);
  50     }
  51
  52     @Override
  53     protected void registrationRemoved(final AbstractDOMDataTreeChangeListenerRegistration<?> registration) {
  54         LOG.debug("Registration {} removed", registration);
  55     }
  56
  57     @Override
  58     public void registerTreeChangeListener(YangInstanceIdentifier treeId, DOMDataTreeChangeListener listener,
  59             Optional<DataTreeCandidate> initialState,
  60             Consumer<ListenerRegistration<DOMDataTreeChangeListener>> onRegistration) {
  61         LOG.debug("{}: registerTreeChangeListener: path: {}, listener: {}", logContext, treeId, listener);
  62
  63         AbstractDOMDataTreeChangeListenerRegistration<org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener>
  64             registration = super.registerTreeChangeListener(treeId, new ForwardingDOMDataTreeChangeListener(listener));
  65
  66         onRegistration.accept(
  67             new org.opendaylight.controller.md.sal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration<
  68                     DOMDataTreeChangeListener>(listener) {
  69                 @Override
  70                 protected void removeRegistration() {
  71                     registration.close();
  72                 }
  73             });
  74
  75         if (initialState.isPresent()) {
  76             notifySingleListener(treeId, listener, initialState.get(), logContext);
  77         }
  78     }
  79
  80     static void notifySingleListener(YangInstanceIdentifier treeId, DOMDataTreeChangeListener listener,
  81             DataTreeCandidate state, String logContext) {
  82         LOG.debug("{}: notifySingleListener: path: {}, listener: {}", logContext, treeId, listener);
  83         DefaultShardDataTreeChangeListenerPublisher publisher =
  84                 new DefaultShardDataTreeChangeListenerPublisher(logContext);
  85         publisher.logContext = logContext;
  86         publisher.registerTreeChangeListener(treeId, listener, Optional.absent(), noop -> { });
  87         publisher.publishChanges(state);
  88     }
  89
  90     private static class ForwardingDOMDataTreeChangeListener
  91             implements org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener {
  92         final DOMDataTreeChangeListener delegate;
  93
  94         ForwardingDOMDataTreeChangeListener(DOMDataTreeChangeListener delegate) {
  95             this.delegate = delegate;
  96         }
  97
  98         @Override
  99         public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
 100             delegate.onDataTreeChanged(changes);
 101         }
 102
 103         @Override
 104         public String toString() {
 105             return delegate.toString();
 106         }
 107     }
 108 }