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.util; 018 019import java.io.File; 020import java.util.Collections; 021import java.util.List; 022 023import org.apache.logging.log4j.core.config.Configuration; 024import org.apache.logging.log4j.core.config.ConfigurationListener; 025import org.apache.logging.log4j.core.config.Reconfigurable; 026 027/** 028 * 029 */ 030public class WrappedFileWatcher extends AbstractWatcher implements FileWatcher { 031 032 private final FileWatcher watcher; 033 private volatile long lastModifiedMillis; 034 035 public WrappedFileWatcher(FileWatcher watcher, final Configuration configuration, 036 final Reconfigurable reconfigurable, final List<ConfigurationListener> configurationListeners, 037 final long lastModifiedMillis) { 038 super(configuration, reconfigurable, configurationListeners); 039 this.watcher = watcher; 040 this.lastModifiedMillis = lastModifiedMillis; 041 } 042 043 044 public WrappedFileWatcher(FileWatcher watcher) { 045 super(null, null, null); 046 this.watcher = watcher; 047 } 048 049 public long getLastModified() { 050 return lastModifiedMillis; 051 } 052 053 @Override 054 public void fileModified(File file) { 055 watcher.fileModified(file); 056 } 057 058 @Override 059 public boolean isModified() { 060 long lastModified = getSource().getFile().lastModified(); 061 if (lastModifiedMillis != lastModified) { 062 lastModifiedMillis = lastModified; 063 return true; 064 } 065 return false; 066 } 067 068 @Override 069 public List<ConfigurationListener> getListeners() { 070 if (super.getListeners() != null) { 071 return Collections.unmodifiableList(super.getListeners()); 072 } else { 073 return null; 074 } 075 } 076 077 @Override 078 public void modified() { 079 if (getListeners() != null) { 080 super.modified(); 081 } 082 fileModified(getSource().getFile()); 083 lastModifiedMillis = getSource().getFile().lastModified(); 084 } 085 086 @Override 087 public void watching(Source source) { 088 lastModifiedMillis = source.getFile().lastModified(); 089 super.watching(source); 090 } 091 092 @Override 093 public Watcher newWatcher(final Reconfigurable reconfigurable, final List<ConfigurationListener> listeners, 094 long lastModifiedMillis) { 095 WrappedFileWatcher watcher = new WrappedFileWatcher(this.watcher, getConfiguration(), reconfigurable, listeners, 096 lastModifiedMillis); 097 if (getSource() != null) { 098 watcher.watching(getSource()); 099 } 100 return watcher; 101 } 102}