org.jboss.logging.LoggerProviders Maven / Gradle / Ivy
/*
* 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.logging.LogManager;
final class LoggerProviders {
static final String LOGGING_PROVIDER_KEY = "org.jboss.logging.provider";
static final LoggerProvider PROVIDER = find();
private static LoggerProvider find() {
final LoggerProvider result = findProvider();
// Log a debug message indicating which logger we are using
result.getLogger("org.jboss.logging").debugf("Logging Provider: %s", result.getClass().getName());
return result;
}
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);
} else if ("jdk".equalsIgnoreCase(loggerProvider)) {
return tryJDK();
} else if ("log4j".equalsIgnoreCase(loggerProvider)) {
return tryLog4j(cl);
} else if ("slf4j".equalsIgnoreCase(loggerProvider)) {
return trySlf4j();
}
}
} catch (Throwable t) {
}
try {
return tryJBossLogManager(cl);
} catch (Throwable t) {
// nope...
}
try {
return tryLog4j(cl);
} catch (Throwable t) {
// nope...
}
try {
// only use slf4j if Logback is in use
Class.forName("ch.qos.logback.classic.Logger", false, cl);
return trySlf4j();
} catch (Throwable t) {
// nope...
}
return tryJDK();
}
private static JDKLoggerProvider tryJDK() {
return new JDKLoggerProvider();
}
private static LoggerProvider trySlf4j() {
return new Slf4jLoggerProvider();
}
private static LoggerProvider tryLog4j(final ClassLoader cl) 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.
Class.forName("org.apache.log4j.Hierarchy", true, cl);
return new Log4jLoggerProvider();
}
private static LoggerProvider tryJBossLogManager(final ClassLoader cl) 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()) {
return new JBossLogManagerProvider();
}
throw new IllegalStateException();
}
private LoggerProviders() {
}
}