2 * Copyright (c) 2014 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.md.sal.dom.broker.impl;
10 import com.google.common.base.Preconditions;
11 import javax.annotation.Nonnull;
12 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
13 import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
14 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
15 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeService;
16 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeIdentifier;
17 import org.opendaylight.controller.md.sal.dom.spi.ForwardingDOMDataBroker;
18 import org.opendaylight.yangtools.concepts.ListenerRegistration;
21 * An implementation of a {@link DOMDataBroker}, which forwards most requests to a delegate.
24 * Its interpretation of the API contract is somewhat looser, specifically it does not
25 * guarantee transaction ordering between transactions allocated directly from the broker
26 * and its transaction chains.
28 public final class PingPongDataBroker extends ForwardingDOMDataBroker implements AutoCloseable,
29 DOMDataTreeChangeService {
30 private final DOMDataBroker delegate;
33 * Instantiate a new broker, backed by the the specified delegate
34 * {@link DOMDataBroker}.
36 * @param delegate Backend broker, may not be null.
38 public PingPongDataBroker(@Nonnull final DOMDataBroker delegate) {
39 this.delegate = Preconditions.checkNotNull(delegate);
43 protected DOMDataBroker delegate() {
48 public PingPongTransactionChain createTransactionChain(final TransactionChainListener listener) {
49 return new PingPongTransactionChain(delegate, listener);
58 public <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerDataTreeChangeListener(
59 final DOMDataTreeIdentifier treeId, final L listener) {
60 final DOMDataTreeChangeService treeService = (DOMDataTreeChangeService) delegate.getSupportedExtensions()
61 .get(DOMDataTreeChangeService.class);
62 if (treeService != null) {
63 return treeService.registerDataTreeChangeListener(treeId, listener);
66 throw new UnsupportedOperationException("Delegate " + delegate + " does not support required functionality");
70 public String toString() {
71 return "PingPongDataBroker backed by " + delegate;