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.logging.log4j.jcl; 018 019 import java.util.Map; 020 import java.util.WeakHashMap; 021 import java.util.concurrent.ConcurrentHashMap; 022 import java.util.concurrent.ConcurrentMap; 023 024 import org.apache.commons.logging.Log; 025 import org.apache.commons.logging.LogConfigurationException; 026 import org.apache.commons.logging.LogFactory; 027 import org.apache.logging.log4j.LogManager; 028 import org.apache.logging.log4j.spi.LoggerContext; 029 import org.apache.logging.log4j.spi.ExtendedLogger; 030 031 /** 032 * 033 */ 034 public class LogFactoryImpl extends LogFactory { 035 036 private final Map<LoggerContext, ConcurrentMap<String, Log>> contextMap = 037 new WeakHashMap<LoggerContext, ConcurrentMap<String, Log>>(); 038 039 private final ConcurrentMap<String, Object> attributes = new ConcurrentHashMap<String, Object>(); 040 041 @Override 042 public Log getInstance(final String name) throws LogConfigurationException { 043 final ConcurrentMap<String, Log> loggers = getLoggersMap(); 044 if (loggers.containsKey(name)) { 045 return loggers.get(name); 046 } 047 loggers.putIfAbsent(name, new Log4jLog(PrivateManager.getLogger(name))); 048 return loggers.get(name); 049 } 050 051 private ConcurrentMap<String, Log> getLoggersMap() { 052 final LoggerContext context = PrivateManager.getContext(); 053 synchronized (contextMap) { 054 ConcurrentMap<String, Log> map = contextMap.get(context); 055 if (map == null) { 056 map = new ConcurrentHashMap<String, Log>(); 057 contextMap.put(context, map); 058 } 059 return map; 060 } 061 } 062 063 @Override 064 public Object getAttribute(final String name) { 065 return attributes.get(name); 066 } 067 068 @Override 069 public String[] getAttributeNames() { 070 return attributes.keySet().toArray(new String[attributes.size()]); 071 } 072 073 @Override 074 public Log getInstance(@SuppressWarnings("rawtypes") final Class clazz) throws LogConfigurationException { 075 return getInstance(clazz.getName()); 076 } 077 078 /** 079 * This method is supposed to clear all loggers. In this implementation it will clear all the logger 080 * wrappers but the loggers managed by the underlying logger context will not be. 081 */ 082 @Override 083 public void release() { 084 getLoggersMap().clear(); 085 } 086 087 @Override 088 public void removeAttribute(final String name) { 089 attributes.remove(name); 090 } 091 092 @Override 093 public void setAttribute(final String name, final Object value) { 094 if (value != null) { 095 attributes.put(name, value); 096 } else { 097 removeAttribute(name); 098 } 099 } 100 101 /** 102 * The real bridge between commons logging and Log4j. 103 */ 104 private static class PrivateManager extends LogManager { 105 private static final String FQCN = LogFactory.class.getName(); 106 107 public static LoggerContext getContext() { 108 return getContext(FQCN, false); 109 } 110 111 public static ExtendedLogger getLogger(final String name) { 112 return getContext().getLogger(name); 113 } 114 } 115 116 }