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         if (LOG.isTraceEnabled()) {
  42             LOG.trace("{}: publishChanges: {}", logContext, candidate);
  43         } else {
  44             LOG.debug("{}: publishChanges: rootPath: {}", logContext, candidate.getRootPath());
  45         }
  46
  47         processCandidateTree(candidate);
  48     }
  49
  50     @Override
  51     protected void notifyListener(AbstractDOMDataTreeChangeListenerRegistration<?> registration,
  52             Collection<DataTreeCandidate> changes) {
  53         LOG.debug("{}: notifyListener: listener: {}", logContext, registration.getInstance());
  54         registration.getInstance().onDataTreeChanged(changes);
  55     }
  56
  57     @Override
  58     protected void registrationRemoved(final AbstractDOMDataTreeChangeListenerRegistration<?> registration) {
  59         LOG.debug("Registration {} removed", registration);
  60     }
  61
  62     @Override
  63     public void registerTreeChangeListener(YangInstanceIdentifier treeId, DOMDataTreeChangeListener listener,
  64             Optional<DataTreeCandidate> initialState,
  65             Consumer<ListenerRegistration<DOMDataTreeChangeListener>> onRegistration) {
  66         LOG.debug("{}: registerTreeChangeListener: path: {}, listener: {}", logContext, treeId, listener);
  67
  68         AbstractDOMDataTreeChangeListenerRegistration<org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener>
  69             registration = super.registerTreeChangeListener(treeId, new ForwardingDOMDataTreeChangeListener(listener));
  70
  71         onRegistration.accept(
  72             new org.opendaylight.controller.md.sal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration<
  73                     DOMDataTreeChangeListener>(listener) {
  74                 @Override
  75                 protected void removeRegistration() {
  76                     registration.close();
  77                 }
  78             });
  79
  80         if (initialState.isPresent()) {
  81             notifySingleListener(treeId, listener, initialState.get(), logContext);
  82         }
  83     }
  84
  85     static void notifySingleListener(YangInstanceIdentifier treeId, DOMDataTreeChangeListener listener,
  86             DataTreeCandidate state, String logContext) {
  87         LOG.debug("{}: notifySingleListener: path: {}, listener: {}", logContext, treeId, listener);
  88         DefaultShardDataTreeChangeListenerPublisher publisher =
  89                 new DefaultShardDataTreeChangeListenerPublisher(logContext);
  90         publisher.logContext = logContext;
  91         publisher.registerTreeChangeListener(treeId, listener, Optional.absent(), noop -> { });
  92         publisher.publishChanges(state);
  93     }
  94
  95     private static class ForwardingDOMDataTreeChangeListener
  96             implements org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener {
  97         final DOMDataTreeChangeListener delegate;
  98
  99         ForwardingDOMDataTreeChangeListener(DOMDataTreeChangeListener delegate) {
 100             this.delegate = delegate;
 101         }
 102
 103         @Override
 104         public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
 105             delegate.onDataTreeChanged(changes);
 106         }
 107
 108         @Override
 109         public String toString() {
 110             return delegate.toString();
 111         }
 112     }
 113 }