| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.configuration2.reloading; |
| |
| /** |
| * <p> |
| * An interface to be implemented by objects which can detect whether a reload |
| * operation is required. |
| * </p> |
| * <p> |
| * This interface is used by a {@link ReloadingController} object. When a |
| * reloading check is to be performed, it is delegated to a concrete |
| * implementation. The implementation decides whether (specific) criteria for a |
| * reload are fulfilled, so that the controller can react accordingly. |
| * </p> |
| * <p> |
| * This interface does not define how a check for a reload is performed. This is |
| * completely up to a concrete implementation. There is just one method for |
| * executing the check and one method to notify the {@code ReloadingDetector} |
| * that the reload actually happened; this method can be used to reset the |
| * internal state so that the conditions for the next reload can be detected. |
| * </p> |
| * <p> |
| * When used together with {@code ReloadingController} an implementation does |
| * not have to be thread-safe. The controller takes care for synchronization so |
| * that an instance is accessed by a single thread only. |
| * </p> |
| * |
| * @since 2.0 |
| */ |
| public interface ReloadingDetector |
| { |
| /** |
| * Checks whether all criteria for a reload operation are fulfilled. This |
| * method is called by external components to find out when reloading should |
| * take place. |
| * |
| * @return <b>true</b> if a reload operation should be performed, |
| * <b>false</b> otherwise |
| */ |
| boolean isReloadingRequired(); |
| |
| /** |
| * Notifies this object that a reload operation has been performed. This |
| * method is called after {@code reloadingRequired()} has returned |
| * <b>true</b>. It can be used to reset internal state in order to detect |
| * the next reload operation. |
| */ |
| void reloadingPerformed(); |
| } |