org.apache.logging.slf4j.Log4jLoggerFactory Maven / Gradle / Ivy
/*
* 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.logging.slf4j;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.LoggingException;
import org.apache.logging.log4j.spi.AbstractLoggerAdapter;
import org.apache.logging.log4j.spi.LoggerContext;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.util.StackLocatorUtil;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;
import java.util.function.Predicate;
/**
* Log4j implementation of SLF4J ILoggerFactory interface.
*/
public class Log4jLoggerFactory extends AbstractLoggerAdapter implements ILoggerFactory {
private static final StatusLogger LOGGER = StatusLogger.getLogger();
private static final String SLF4J_PACKAGE = "org.slf4j";
private static final String TO_SLF4J_CONTEXT = "org.apache.logging.slf4j.SLF4JLoggerContext";
private static final Predicate> CALLER_PREDICATE = clazz ->
!AbstractLoggerAdapter.class.equals(clazz) && !clazz.getName().startsWith(SLF4J_PACKAGE);
@Override
protected Logger newLogger(final String name, final LoggerContext context) {
final String key = Logger.ROOT_LOGGER_NAME.equals(name) ? LogManager.ROOT_LOGGER_NAME : name;
return new Log4jLogger(validateContext(context).getLogger(key), name);
}
@Override
protected LoggerContext getContext() {
final Class anchor = LogManager.getFactory().isClassLoaderDependent()
? StackLocatorUtil.getCallerClass(Log4jLoggerFactory.class, CALLER_PREDICATE)
: null;
LOGGER.trace("Log4jLoggerFactory.getContext() found anchor {}", anchor);
return anchor == null
? LogManager.getContext(false)
: getContext(anchor);
}
private LoggerContext validateContext(final LoggerContext context) {
if (TO_SLF4J_CONTEXT.equals(context.getClass().getName())) {
throw new LoggingException("log4j-slf4j-impl cannot be present with log4j-to-slf4j");
}
return context;
}
}