2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.controller.cluster.datastore;
10 import com.google.common.base.Optional;
11 import com.google.common.base.Preconditions;
12 import java.util.Map.Entry;
13 import javax.annotation.concurrent.GuardedBy;
14 import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListener;
15 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
16 import org.opendaylight.yangtools.concepts.ListenerRegistration;
17 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
20 * Intermediate proxy registration returned to the user when we cannot
21 * instantiate the registration immediately. It provides a bridge to
22 * a real registration which may materialize at some point in the future.
24 final class DelayedDataTreeListenerRegistration implements ListenerRegistration<DOMDataTreeChangeListener> {
25 private final RegisterDataTreeChangeListener registerTreeChangeListener;
26 private volatile ListenerRegistration<DOMDataTreeChangeListener> delegate;
28 private boolean closed;
30 DelayedDataTreeListenerRegistration(final RegisterDataTreeChangeListener registerTreeChangeListener) {
31 this.registerTreeChangeListener = Preconditions.checkNotNull(registerTreeChangeListener);
34 synchronized void createDelegate(final LeaderLocalDelegateFactory<RegisterDataTreeChangeListener, ListenerRegistration<DOMDataTreeChangeListener>, Optional<DataTreeCandidate>> factory) {
36 final Entry<ListenerRegistration<DOMDataTreeChangeListener>, Optional<DataTreeCandidate>> res =
37 factory.createDelegate(registerTreeChangeListener);
38 this.delegate = res.getKey();
39 factory.getShard().getDataStore().notifyOfInitialData(registerTreeChangeListener.getPath(),
40 this.delegate.getInstance(), res.getValue());
45 public DOMDataTreeChangeListener getInstance() {
46 final ListenerRegistration<DOMDataTreeChangeListener> d = delegate;
47 return d == null ? null : d.getInstance();
51 public synchronized void close() {
54 if (delegate != null) {