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 org.apache.logging.log4j.core.util.FileWatcher; 020import org.apache.logging.log4j.core.util.Log4jThread; 021 022import java.io.File; 023import java.util.List; 024 025/** 026 * Watcher for configuration files. Causes a reconfiguration when a file changes. 027 */ 028public class ConfiguratonFileWatcher implements FileWatcher { 029 030 private final Reconfigurable reconfigurable; 031 private final List<ConfigurationListener> listeners; 032 033 public ConfiguratonFileWatcher(final Reconfigurable reconfigurable, final List<ConfigurationListener> listeners) { 034 this.reconfigurable = reconfigurable; 035 this.listeners = listeners; 036 } 037 038 public List<ConfigurationListener> getListeners() { 039 return listeners; 040 } 041 042 043 @Override 044 public void fileModified(final File file) { 045 for (final ConfigurationListener listener : listeners) { 046 final Thread thread = new Log4jThread(new ReconfigurationWorker(listener, reconfigurable)); 047 thread.setDaemon(true); 048 thread.start(); 049 } 050 } 051 052 /** 053 * Helper class for triggering a reconfiguration in a background thread. 054 */ 055 private static class ReconfigurationWorker implements Runnable { 056 057 private final ConfigurationListener listener; 058 private final Reconfigurable reconfigurable; 059 060 public ReconfigurationWorker(final ConfigurationListener listener, final Reconfigurable reconfigurable) { 061 this.listener = listener; 062 this.reconfigurable = reconfigurable; 063 } 064 065 @Override 066 public void run() { 067 listener.onChange(reconfigurable); 068 } 069 } 070}