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/*
* JBoss, Home of Professional Open Source.
*
* Copyright 2011 Red Hat, Inc.
*
* Licensed 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.jboss.logging;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import java.util.logging.LogManager;
final class LoggerProviders {
static final String LOGGING_PROVIDER_KEY = "org.jboss.logging.provider";
static final LoggerProvider PROVIDER = find();
private static LoggerProvider find() {
return findProvider();
}
private static LoggerProvider findProvider() {
// Since the impl classes refer to the back-end frameworks directly, if this classloader can't find the target
// log classes, then it doesn't really matter if they're possibly available from the TCCL because we won't be
// able to find it anyway
final ClassLoader cl = LoggerProviders.class.getClassLoader();
try {
// Check the system property
final String loggerProvider = AccessController.doPrivileged(new PrivilegedAction() {
public String run() {
return System.getProperty(LOGGING_PROVIDER_KEY);
}
});
if (loggerProvider != null) {
if ("jboss".equalsIgnoreCase(loggerProvider)) {
return tryJBossLogManager(cl, "system property");
} else if ("jdk".equalsIgnoreCase(loggerProvider)) {
return tryJDK("system property");
} else if ("log4j2".equalsIgnoreCase(loggerProvider)) {
return tryLog4j2(cl, "system property");
} else if ("log4j".equalsIgnoreCase(loggerProvider)) {
return tryLog4j(cl, "system property");
} else if ("slf4j".equalsIgnoreCase(loggerProvider)) {
return trySlf4j("system property");
}
}
} catch (Throwable t) {
// nope...
}
// Next try for a service provider
try {
final ServiceLoader loader = ServiceLoader.load(LoggerProvider.class, cl);
final Iterator iter = loader.iterator();
for (; ; )
try {
if (!iter.hasNext()) break;
LoggerProvider provider = iter.next();
// Attempt to get a logger, if it fails keep trying
logProvider(provider, "service loader");
return provider;
} catch (ServiceConfigurationError ignore) {
}
} catch (Throwable ignore) {
// TODO consider printing the stack trace as it should only happen once
}
// Finally search the class path
try {
return tryJBossLogManager(cl, null);
} catch (Throwable t) {
// nope...
}
try {
// MUST try Log4j 2.x BEFORE Log4j 1.x because Log4j 2.x also passes Log4j 1.x test in some circumstances
return tryLog4j2(cl, null);
} catch (Throwable t) {
// nope...
}
try {
return tryLog4j(cl, null);
} catch (Throwable t) {
// nope...
}
try {
// only use slf4j if Logback is in use
Class.forName("ch.qos.logback.classic.Logger", false, cl);
return trySlf4j(null);
} catch (Throwable t) {
// nope...
}
return tryJDK(null);
}
private static JDKLoggerProvider tryJDK(final String via) {
final JDKLoggerProvider provider = new JDKLoggerProvider();
logProvider(provider, via);
return provider;
}
private static LoggerProvider trySlf4j(final String via) {
final LoggerProvider provider = new Slf4jLoggerProvider();
logProvider(provider, via);
return provider;
}
// JBLOGGING-95 - Add support for Log4j 2.x
private static LoggerProvider tryLog4j2(final ClassLoader cl, final String via) throws ClassNotFoundException {
Class.forName("org.apache.logging.log4j.Logger", true, cl);
Class.forName("org.apache.logging.log4j.LogManager", true, cl);
Class.forName("org.apache.logging.log4j.spi.AbstractLogger", true, cl);
LoggerProvider provider = new Log4j2LoggerProvider();
// if Log4j 2 has a bad implementation that doesn't extend AbstractLogger, we won't know until getting the first logger throws an exception
logProvider(provider, via);
return provider;
}
private static LoggerProvider tryLog4j(final ClassLoader cl, final String via) throws ClassNotFoundException {
Class.forName("org.apache.log4j.LogManager", true, cl);
// JBLOGGING-65 - slf4j can disguise itself as log4j. Test for a class that slf4j doesn't provide.
// JBLOGGING-94 - JBoss Logging does not detect org.apache.logging.log4j:log4j-1.2-api:2.0
Class.forName("org.apache.log4j.config.PropertySetter", true, cl);
final LoggerProvider provider = new Log4jLoggerProvider();
logProvider(provider, via);
return provider;
}
private static LoggerProvider tryJBossLogManager(final ClassLoader cl, final String via) throws ClassNotFoundException {
final Class logManagerClass = LogManager.getLogManager().getClass();
if (logManagerClass == Class.forName("org.jboss.logmanager.LogManager", false, cl)
&& Class.forName("org.jboss.logmanager.Logger$AttachmentKey", true, cl).getClassLoader() == logManagerClass.getClassLoader()) {
final LoggerProvider provider = new JBossLogManagerProvider();
logProvider(provider, via);
return provider;
}
throw new IllegalStateException();
}
private static void logProvider(final LoggerProvider provider, final String via) {
// Log a debug message indicating which logger we are using
final Logger logger = provider.getLogger(LoggerProviders.class.getPackage().getName());
if (via == null) {
logger.debugf("Logging Provider: %s", provider.getClass().getName());
} else {
logger.debugf("Logging Provider: %s found via %s", provider.getClass().getName(), via);
}
}
private LoggerProviders() {
}
}
