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.mdsal.common.api;
10 import org.opendaylight.yangtools.concepts.Path;
14 * Base interface that provides access to a conceptual data tree store and also provides the ability
15 * to subscribe for changes to data under a given branch of the tree.
18 * All operations on the data tree are performed via one of the transactions:
20 * <li>Read-Only - allocated using {@link #newReadOnlyTransaction()}
21 * <li>Write-Only - allocated using {@link #newWriteOnlyTransaction()}
25 * These transactions provide a stable isolated view of data tree, which is guaranteed to be not
26 * affected by other concurrent transactions, until transaction is committed.
29 * For a detailed explanation of how transaction are isolated and how transaction-local changes are
30 * committed to global data tree, see {@link AsyncReadTransaction}, {@link AsyncWriteTransaction}
31 * and {@link AsyncWriteTransaction#commit()}.
35 * It is strongly recommended to use the type of transaction, which provides only the minimal
36 * capabilities you need. This allows for optimizations at the data broker / data store level. For
37 * example, implementations may optimize the transaction for reading if they know ahead of time that
38 * you only need to read data - such as not keeping additional meta-data, which may be required for
42 * <b>Implementation Note:</b> This interface is not intended to be implemented by users of MD-SAL,
43 * but only to be consumed by them.
45 * @param <P> Type of path (subtree identifier), which represents location in tree
46 * @param <D> Type of data (payload), which represents data payload
48 public interface AsyncDataBroker<P extends Path<P>, D> extends
49 AsyncDataTransactionFactory<P, D> {
53 AsyncReadTransaction<P, D> newReadOnlyTransaction();
57 AsyncWriteTransaction<P, D> newWriteOnlyTransaction();
60 AsyncReadWriteTransaction<P, D> newReadWriteTransaction();