1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.configuration2.sync;
18
19 /**
20 * <p>
21 * An implementation of the {@code Synchronizer} interface which does not perform any synchronization.
22 * </p>
23 * <p>
24 * This class is the option of choice for applications that do not access configuration concurrently. All methods
25 * required by the {@code Synchronizer} interface are just empty dummies. Therefore, this class does not have any
26 * synchronization overhead. Of course, configurations using this {@code Synchronizer} implementation are not
27 * thread-safe!
28 * </p>
29 * <p>
30 * Implementation note: This class is an enumeration because only a single instance needs to exist. This instance can be
31 * shared between arbitrary configurations.
32 * </p>
33 *
34 * @since 2.0
35 */
36 public enum NoOpSynchronizer implements Synchronizer {
37 /** The single shared instance of this class. */
38 INSTANCE;
39
40 @Override
41 public void beginRead() {
42 }
43
44 @Override
45 public void beginWrite() {
46 }
47
48 @Override
49 public void endRead() {
50 }
51
52 @Override
53 public void endWrite() {
54 }
55 }