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 */ 017 package org.apache.commons.configuration.reloading; 018 019 import org.apache.commons.logging.Log; 020 import org.apache.commons.logging.LogFactory; 021 022 import java.io.File; 023 import java.util.Random; 024 025 /** 026 * A ReloadingStrategy that randomly returns true or false; 027 */ 028 public class FileRandomReloadingStrategy extends FileChangedReloadingStrategy 029 { 030 Random random = new Random(); 031 032 /** The Log to use for diagnostic messages */ 033 private Log logger = LogFactory.getLog(FileRandomReloadingStrategy.class); 034 035 /** 036 * Checks whether a reload is necessary. 037 * 038 * @return a flag whether a reload is required 039 */ 040 @Override 041 public boolean reloadingRequired() 042 { 043 boolean result = random.nextBoolean(); 044 if (result) 045 { 046 if (logger.isDebugEnabled()) 047 { 048 logger.debug("File change detected: " + getName()); 049 } 050 } 051 return result; 052 } 053 054 /** 055 * Returns the file that is watched by this strategy. 056 * 057 * @return the monitored file 058 */ 059 public File getMonitoredFile() 060 { 061 return getFile(); 062 } 063 064 private String getName() 065 { 066 return getName(getFile()); 067 } 068 069 private String getName(File file) 070 { 071 String name = configuration.getURL().toString(); 072 if (name == null) 073 { 074 if (file != null) 075 { 076 name = file.getAbsolutePath(); 077 } 078 else 079 { 080 name = "base: " + configuration.getBasePath() 081 + "file: " + configuration.getFileName(); 082 } 083 } 084 return name; 085 } 086 }