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.logging.log4j.core.config; 018 019import java.io.File; 020import java.util.List; 021 022import org.apache.logging.log4j.core.util.AbstractWatcher; 023import org.apache.logging.log4j.core.util.FileWatcher; 024import org.apache.logging.log4j.core.util.Source; 025import org.apache.logging.log4j.core.util.Watcher; 026 027/** 028 * Watcher for configuration files. Causes a reconfiguration when a file changes. 029 */ 030public class ConfigurationFileWatcher extends AbstractWatcher implements FileWatcher { 031 032 private File file; 033 private long lastModifiedMillis; 034 035 public ConfigurationFileWatcher(final Configuration configuration, final Reconfigurable reconfigurable, 036 final List<ConfigurationListener> configurationListeners, long lastModifiedMillis) { 037 super(configuration, reconfigurable, configurationListeners); 038 this.lastModifiedMillis = lastModifiedMillis; 039 } 040 041 public long getLastModified() { 042 return file != null ? file.lastModified() : 0; 043 } 044 045 @Override 046 public void fileModified(final File file) { 047 lastModifiedMillis = file.lastModified(); 048 } 049 050 @Override 051 public void watching(Source source) { 052 file = source.getFile(); 053 lastModifiedMillis = file.lastModified(); 054 super.watching(source); 055 } 056 057 @Override 058 public boolean isModified() { 059 return lastModifiedMillis != file.lastModified(); 060 } 061 062 @Override 063 public Watcher newWatcher(final Reconfigurable reconfigurable, final List<ConfigurationListener> listeners, 064 long lastModifiedMillis) { 065 ConfigurationFileWatcher watcher = new ConfigurationFileWatcher(getConfiguration(), reconfigurable, listeners, 066 lastModifiedMillis); 067 if (getSource() != null) { 068 watcher.watching(getSource()); 069 } 070 return watcher; 071 } 072}