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}