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The ActiveMQ Message Broker implementation
/**
* 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.activemq.broker.jmx;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Locale;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Log4JConfigView implements Log4JConfigViewMBean {
private static final Logger LOG = LoggerFactory.getLogger(Log4JConfigView.class);
@Override
public String getRootLogLevel() throws Exception {
ClassLoader cl = getClassLoader();
if (!isLog4JAvailable(cl)) {
return null;
}
Class loggerClass = getLoggerClass(cl);
if (loggerClass == null) {
return null;
}
Method getRootLogger = loggerClass.getMethod("getRootLogger", new Class[]{});
Method getLevel = loggerClass.getMethod("getLevel", new Class[]{});
Object rootLogger = getRootLogger.invoke(null, (Object[])null);
return getLevel.invoke(rootLogger, (Object[])null).toString();
}
@Override
public void setRootLogLevel(String level) throws Exception {
ClassLoader cl = getClassLoader();
if (!isLog4JAvailable(cl)) {
return;
}
Class loggerClass = getLoggerClass(cl);
Class levelClass = getLevelClass(cl);
if (levelClass == null || loggerClass == null) {
return;
}
String targetLevel = level.toUpperCase(Locale.US);
Method getRootLogger = loggerClass.getMethod("getRootLogger", new Class[]{});
Method setLevel = loggerClass.getMethod("setLevel", levelClass);
Object rootLogger = getRootLogger.invoke(null, (Object[])null);
Method toLevel = levelClass.getMethod("toLevel", String.class);
Object newLevel = toLevel.invoke(null, targetLevel);
// Check that the level conversion worked and that we got a level
// that matches what was asked for. A bad level name will result
// in the lowest level value and we don't want to change unless we
// matched what the user asked for.
if (newLevel != null && newLevel.toString().equals(targetLevel)) {
LOG.debug("Set level {} for root logger.", level);
setLevel.invoke(rootLogger, newLevel);
}
}
@Override
public List getLoggers() throws Exception {
ClassLoader cl = getClassLoader();
if (!isLog4JAvailable(cl)) {
return Collections.emptyList();
}
Class logManagerClass = getLogManagerClass(cl);
Class loggerClass = getLoggerClass(cl);
if (logManagerClass == null || loggerClass == null) {
return Collections.emptyList();
}
Method getCurrentLoggers = logManagerClass.getMethod("getCurrentLoggers", new Class[]{});
Method getName = loggerClass.getMethod("getName", new Class[]{});
List list = new ArrayList();
Enumeration loggers = (Enumeration)getCurrentLoggers.invoke(null, (Object[])null);
while (loggers.hasMoreElements()) {
Object logger = loggers.nextElement();
if (logger != null) {
list.add((String) getName.invoke(logger, (Object[])null));
}
}
LOG.debug("Found {} loggers", list.size());
return list;
}
@Override
public String getLogLevel(String loggerName) throws Exception {
ClassLoader cl = getClassLoader();
if (!isLog4JAvailable(cl)) {
return null;
}
Class loggerClass = getLoggerClass(cl);
if (loggerClass == null) {
return null;
}
Method getLogger = loggerClass.getMethod("getLogger", String.class);
String logLevel = null;
if (loggerName != null && !loggerName.isEmpty()) {
Object logger = getLogger.invoke(null, loggerName);
if (logger != null) {
LOG.debug("Found level {} for logger: {}", logLevel, loggerName);
Method getLevel = loggerClass.getMethod("getLevel", new Class[]{});
Object level = getLevel.invoke(logger, (Object[])null);
if (level != null) {
logLevel = level.toString();
} else {
Method getRootLogger = loggerClass.getMethod("getRootLogger", new Class[]{});
Object rootLogger = getRootLogger.invoke(null, (Object[])null);
logLevel = getLevel.invoke(rootLogger, (Object[])null).toString();
}
}
} else {
throw new IllegalArgumentException("Logger names cannot be null or empty strings");
}
return logLevel;
}
@Override
public void setLogLevel(String loggerName, String level) throws Exception {
if (loggerName == null || loggerName.isEmpty()) {
throw new IllegalArgumentException("Logger names cannot be null or empty strings");
}
if (level == null || level.isEmpty()) {
throw new IllegalArgumentException("Level name cannot be null or empty strings");
}
ClassLoader cl = getClassLoader();
if (!isLog4JAvailable(cl)) {
return;
}
Class loggerClass = getLoggerClass(cl);
Class levelClass = getLevelClass(cl);
if (loggerClass == null || levelClass == null) {
return;
}
String targetLevel = level.toUpperCase(Locale.US);
Method getLogger = loggerClass.getMethod("getLogger", String.class);
Method setLevel = loggerClass.getMethod("setLevel", levelClass);
Method toLevel = levelClass.getMethod("toLevel", String.class);
Object logger = getLogger.invoke(null, loggerName);
if (logger != null) {
Object newLevel = toLevel.invoke(null, targetLevel);
// Check that the level conversion worked and that we got a level
// that matches what was asked for. A bad level name will result
// in the lowest level value and we don't want to change unless we
// matched what the user asked for.
if (newLevel != null && newLevel.toString().equals(targetLevel)) {
LOG.debug("Set level {} for logger: {}", level, loggerName);
setLevel.invoke(logger, newLevel);
}
}
}
@Override
public void reloadLog4jProperties() throws Throwable {
doReloadLog4jProperties();
}
//---------- Static Helper Methods ---------------------------------------//
public static void doReloadLog4jProperties() throws Throwable {
try {
ClassLoader cl = Log4JConfigView.class.getClassLoader();
Class logManagerClass = getLogManagerClass(cl);
if (logManagerClass == null) {
LOG.debug("Could not locate log4j classes on classpath.");
return;
}
Method resetConfiguration = logManagerClass.getMethod("resetConfiguration", new Class[]{});
resetConfiguration.invoke(null, new Object[]{});
String configurationOptionStr = System.getProperty("log4j.configuration");
URL log4jprops = null;
if (configurationOptionStr != null) {
try {
log4jprops = new URL(configurationOptionStr);
} catch (MalformedURLException ex) {
log4jprops = cl.getResource("log4j.properties");
}
} else {
log4jprops = cl.getResource("log4j.properties");
}
if (log4jprops != null) {
Class propertyConfiguratorClass = cl.loadClass("org.apache.log4j.PropertyConfigurator");
Method configure = propertyConfiguratorClass.getMethod("configure", new Class[]{URL.class});
configure.invoke(null, new Object[]{log4jprops});
}
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
}
public static boolean isLog4JAvailable() {
return isLog4JAvailable(getClassLoader());
}
private static ClassLoader getClassLoader() {
return Log4JConfigView.class.getClassLoader();
}
private static boolean isLog4JAvailable(ClassLoader cl) {
if (getLogManagerClass(cl) != null) {
return true;
}
LOG.debug("Could not locate log4j classes on classpath.");
return false;
}
private static Class getLogManagerClass(ClassLoader cl) {
Class logManagerClass = null;
try {
logManagerClass = cl.loadClass("org.apache.log4j.LogManager");
} catch (ClassNotFoundException e) {
}
return logManagerClass;
}
private static Class getLoggerClass(ClassLoader cl) {
Class loggerClass = null;
try {
loggerClass = cl.loadClass("org.apache.log4j.Logger");
} catch (ClassNotFoundException e) {
}
return loggerClass;
}
private static Class getLevelClass(ClassLoader cl) {
Class levelClass = null;
try {
levelClass = cl.loadClass("org.apache.log4j.Level");
} catch (ClassNotFoundException e) {
}
return levelClass;
}
}