001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.configuration2.sync;
018
019/**
020 * <p>
021 * An implementation of the {@code Synchronizer} interface which does not
022 * perform any synchronization.
023 * </p>
024 * <p>
025 * This class is the option of choice for applications that do not access
026 * configuration concurrently. All methods required by the {@code Synchronizer}
027 * interface are just empty dummies. Therefore, this class does not have any
028 * synchronization overhead. Of course, configurations using this
029 * {@code Synchronizer} implementation are not thread-safe!
030 * </p>
031 * <p>
032 * Implementation note: This class is an enumeration because only a single
033 * instance needs to exist. This instance can be shared between arbitrary
034 * configurations.
035 * </p>
036 *
037 * @since 2.0
038 */
039public enum NoOpSynchronizer implements Synchronizer
040{
041    /** The single shared instance of this class. */
042    INSTANCE;
043
044    @Override
045    public void beginRead()
046    {
047    }
048
049    @Override
050    public void endRead()
051    {
052    }
053
054    @Override
055    public void beginWrite()
056    {
057    }
058
059    @Override
060    public void endWrite()
061    {
062    }
063}