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 org.opendaylight.mdsal.dom.api.DOMDataBroker;
11 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
12 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeService;
13 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
15 import com.google.common.base.Preconditions;
16 import javax.annotation.Nonnull;
17 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
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.
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, DOMDataTreeChangeService {
29 private final DOMDataBroker delegate;
32 * Instantiate a new broker, backed by the the specified delegate
33 * {@link DOMDataBroker}.
35 * @param delegate Backend broker, may not be null.
37 public PingPongDataBroker(@Nonnull final DOMDataBroker delegate) {
38 this.delegate = Preconditions.checkNotNull(delegate);
42 protected DOMDataBroker delegate() {
47 public PingPongTransactionChain createTransactionChain(final TransactionChainListener listener) {
48 return new PingPongTransactionChain(delegate, listener);
53 // TODO Auto-generated method stub
57 public <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerDataTreeChangeListener(final DOMDataTreeIdentifier treeId, final L listener) {
58 if (delegate instanceof DOMDataTreeChangeService) {
59 return ((DOMDataTreeChangeService)delegate).registerDataTreeChangeListener(treeId, listener);
62 throw new UnsupportedOperationException("Delegate " + delegate + " does not support required functionality");