| /* |
| * 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.logging.log4j.core.util; |
| |
| import java.util.List; |
| |
| import org.apache.logging.log4j.core.config.ConfigurationListener; |
| import org.apache.logging.log4j.core.config.Reconfigurable; |
| |
| /** |
| * Watches for changes in a Source and performs an action when it is modified. |
| * |
| * @see WatchManager |
| */ |
| public interface Watcher { |
| |
| String CATEGORY = "Watcher"; |
| String ELEMENT_TYPE = "watcher"; |
| |
| /** |
| * Returns the list of listeners for this configuration. |
| * @return The list of listeners. |
| */ |
| List<ConfigurationListener> getListeners(); |
| |
| /** |
| * Called when the configuration has been modified. |
| */ |
| void modified(); |
| |
| /** |
| * Periodically called to determine if the configuration has been modified. |
| * @return true if the configuration was modified, false otherwise. |
| */ |
| boolean isModified(); |
| |
| /** |
| * Returns the time the source was last modified or 0 if it is not available. |
| * @return the time the source was last modified. |
| */ |
| long getLastModified(); |
| |
| /** |
| * Called when the Watcher is registered. |
| * @param source the Source that is being watched. |
| */ |
| void watching(Source source); |
| |
| /** |
| * Returns the Source being monitored. |
| * @return the Source. |
| */ |
| Source getSource(); |
| |
| /** |
| * Creates a new Watcher by copying the original and using the new Reconfigurable and listeners. |
| * @param reconfigurable The Reconfigurable. |
| * @param listeners the listeners. |
| * @param lastModifiedMillis The time the resource was last modified in milliseconds. |
| * @return A new Watcher. |
| */ |
| Watcher newWatcher(Reconfigurable reconfigurable, List<ConfigurationListener> listeners, long lastModifiedMillis); |
| } |