    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}