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 static java.util.Objects.requireNonNull;
12 import org.eclipse.jdt.annotation.NonNull;
13 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
14 import org.opendaylight.controller.md.sal.dom.api.DOMDataBroker;
15 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
16 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeService;
17 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeIdentifier;
18 import org.opendaylight.controller.md.sal.dom.spi.ForwardingDOMDataBroker;
19 import org.opendaylight.yangtools.concepts.ListenerRegistration;
22 * An implementation of a {@link DOMDataBroker}, which forwards most requests to a delegate.
25 * Its interpretation of the API contract is somewhat looser, specifically it does not
26 * guarantee transaction ordering between transactions allocated directly from the broker
27 * and its transaction chains.
30 public final class PingPongDataBroker extends ForwardingDOMDataBroker implements AutoCloseable,
31 DOMDataTreeChangeService {
32 private final DOMDataBroker delegate;
35 * Instantiate a new broker, backed by the the specified delegate
36 * {@link DOMDataBroker}.
38 * @param delegate Backend broker, may not be null.
40 public PingPongDataBroker(final @NonNull DOMDataBroker delegate) {
41 this.delegate = requireNonNull(delegate);
45 protected DOMDataBroker delegate() {
50 public PingPongTransactionChain createTransactionChain(final TransactionChainListener listener) {
51 return new PingPongTransactionChain(delegate, listener);
60 public <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerDataTreeChangeListener(
61 final DOMDataTreeIdentifier treeId, final L listener) {
62 final DOMDataTreeChangeService treeService = (DOMDataTreeChangeService) delegate.getSupportedExtensions()
63 .get(DOMDataTreeChangeService.class);
64 if (treeService != null) {
65 return treeService.registerDataTreeChangeListener(treeId, listener);
68 throw new UnsupportedOperationException("Delegate " + delegate + " does not support required functionality");
72 public String toString() {
73 return "PingPongDataBroker backed by " + delegate;