| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.felix.mosgi.jmx.agent.mx4j.log; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.Map; |
| import java.util.HashMap; |
| |
| import javax.management.RuntimeOperationsException; |
| |
| import org.apache.felix.mosgi.jmx.agent.mx4j.MX4JSystemKeys; |
| |
| /** |
| * Main class for the log service. <p> |
| * The system property 'mx4j.log.priority' controls the priority of the standard logging, and defaults to 'warn'. |
| * Possible values are, from least to greatest priority, the following (case insensitive): |
| * <ul> |
| * <li>trace |
| * <li>debug |
| * <li>info |
| * <li>warn |
| * <li>error |
| * <li>fatal |
| * </ul> |
| * |
| * @author <a href="mailto:biorn_steedom@users.sourceforge.net">Simone Bordet</a> |
| * @version $Revision: 1.1.1.1 $ |
| */ |
| public class Log |
| { |
| private static Logger m_prototype; |
| private static Map m_prototypeMap = new HashMap(); |
| private static Map m_loggerCache = new HashMap(); |
| private static int m_defaultPriority; |
| |
| static |
| { |
| // Do not require callers up in the stack to have this permission |
| String priority = (String)AccessController.doPrivileged(new PrivilegedAction() |
| { |
| public Object run() |
| { |
| return System.getProperty(MX4JSystemKeys.MX4J_LOG_PRIORITY); |
| } |
| }); |
| if ("trace".equalsIgnoreCase(priority)) {m_defaultPriority = Logger.TRACE;} |
| else if ("debug".equalsIgnoreCase(priority)) {m_defaultPriority = Logger.DEBUG;} |
| else if ("info".equalsIgnoreCase(priority)) {m_defaultPriority = Logger.INFO;} |
| else if ("warn".equalsIgnoreCase(priority)) {m_defaultPriority = Logger.WARN;} |
| else if ("error".equalsIgnoreCase(priority)) {m_defaultPriority = Logger.ERROR;} |
| else if ("fatal".equalsIgnoreCase(priority)) {m_defaultPriority = Logger.FATAL;} |
| else {m_defaultPriority = Logger.INFO;} |
| |
| String prototype = (String)AccessController.doPrivileged(new PrivilegedAction() |
| { |
| public Object run() |
| { |
| return System.getProperty(MX4JSystemKeys.MX4J_LOG_PROTOTYPE); |
| } |
| }); |
| if (prototype != null && prototype.trim().length() > 0) |
| { |
| try |
| { |
| ClassLoader cl = Thread.currentThread().getContextClassLoader(); |
| Class cls = cl.loadClass(prototype); |
| redirectTo((Logger)cls.newInstance()); |
| } |
| catch (Exception x) |
| { |
| x.printStackTrace(); |
| // Do nothing else: the user will see the exception trace |
| // and understand that the property was wrong |
| } |
| } |
| } |
| |
| private Log() {} |
| |
| /** |
| * Sets the default priority for all loggers. |
| * @see #setDefaultPriority |
| */ |
| public static void setDefaultPriority(int priority) |
| { |
| switch (priority) |
| { |
| case Logger.TRACE: m_defaultPriority = Logger.TRACE; break; |
| case Logger.DEBUG: m_defaultPriority = Logger.DEBUG; break; |
| case Logger.INFO: m_defaultPriority = Logger.INFO; break; |
| case Logger.WARN: m_defaultPriority = Logger.WARN; break; |
| case Logger.ERROR: m_defaultPriority = Logger.ERROR; break; |
| case Logger.FATAL: m_defaultPriority = Logger.FATAL; break; |
| default: m_defaultPriority = Logger.WARN; break; |
| } |
| } |
| |
| /** |
| * Returns the default priority. |
| * @see #setDefaultPriority |
| */ |
| public static int getDefaultPriority() |
| { |
| return m_defaultPriority; |
| } |
| |
| /** |
| * Returns a new instance of a Logger associated with the given <code>category</code>; |
| * if {@link #redirectTo} has been called then a new instance of the prototype Logger, associated with the given |
| * <code>category<code>, is returned. This requires the prototype Logger class to have a public parameterless |
| * constructor. |
| */ |
| public static Logger getLogger(String category) |
| { |
| if (category == null) {throw new RuntimeOperationsException(new IllegalArgumentException("Category cannot be null"));} |
| |
| synchronized (m_loggerCache) |
| { |
| Logger logger = (Logger)m_loggerCache.get(category); |
| if (logger == null) |
| { |
| // Try to see if a delegate for this category overrides other settings |
| Logger prototype = null; |
| synchronized (m_prototypeMap) |
| { |
| prototype = (Logger)m_prototypeMap.get(category); |
| } |
| if (prototype == null) |
| { |
| // Try to see if a prototype for all categories has been set |
| if (m_prototype != null) |
| { |
| logger = createLogger(m_prototype, category); |
| } |
| else |
| { |
| logger = createLogger(null, category); |
| } |
| } |
| else |
| { |
| logger = createLogger(prototype, category); |
| } |
| |
| // cache it |
| m_loggerCache.put(category, logger); |
| } |
| return logger; |
| } |
| } |
| |
| private static Logger createLogger(Logger prototype, String category) |
| { |
| Logger logger = null; |
| try |
| { |
| logger = prototype == null ? new Logger() : (Logger)prototype.getClass().newInstance(); |
| } |
| catch (Exception x) |
| { |
| x.printStackTrace(); |
| logger = new Logger(); |
| } |
| logger.setCategory(category); |
| logger.setPriority(m_defaultPriority); |
| return logger; |
| } |
| |
| /** |
| * Tells to the log service to use the given <code>delegate</code> Logger to perform logging. <br> |
| * Use a null delegate to remove redirection. |
| * @see #getLogger |
| */ |
| public static void redirectTo(Logger prototype) |
| { |
| m_prototype = prototype; |
| |
| // Clear the cache, as we want requests for new loggers to be generated again. |
| synchronized (m_loggerCache) |
| { |
| m_loggerCache.clear(); |
| } |
| } |
| |
| /** |
| * Tells to the log service to use the given <code>delegate</code> Logger to perform logging for the given |
| * category (that cannot be null). <br> |
| * Settings made using this method overrides the ones made with {@link #redirectTo(Logger) redirectTo}, meaning |
| * that it is possible to redirect all the log to a certain delegate but certain categories. |
| * Use a null delegate to remove redirection for the specified category. |
| * @see #getLogger |
| */ |
| public static void redirectTo(Logger prototype, String category) |
| { |
| if (category == null) {throw new RuntimeOperationsException(new IllegalArgumentException("Category cannot be null"));} |
| |
| if (prototype == null) |
| { |
| // Remove the redirection |
| synchronized (m_prototypeMap) |
| { |
| m_prototypeMap.remove(category); |
| } |
| |
| // Clear the cache for this category |
| synchronized (m_loggerCache) |
| { |
| m_loggerCache.remove(category); |
| } |
| } |
| else |
| { |
| // Put or replace |
| synchronized (m_prototypeMap) |
| { |
| m_prototypeMap.put(category, prototype); |
| } |
| |
| // Clear the cache for this category |
| synchronized (m_loggerCache) |
| { |
| m_loggerCache.remove(category); |
| } |
| } |
| } |
| } |