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 }