/*
* 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.log4j.core.impl;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.helpers.Constants;
import org.apache.logging.log4j.core.helpers.Loader;
import org.apache.logging.log4j.core.selector.ClassLoaderContextSelector;
import org.apache.logging.log4j.core.selector.ContextSelector;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.spi.LoggerContextFactory;
/**
* Factory to locate a ContextSelector and then load a LoggerContext.
*/
public class Log4jContextFactory implements LoggerContextFactory {
private ContextSelector selector;
private StatusLogger logger = StatusLogger.getLogger();
private ThreadLocal<Log4jContextFactory> recursive = new ThreadLocal<Log4jContextFactory>();
/**
* Constructor that initializes the ContextSelector.
*/
public Log4jContextFactory() {
String sel = System.getProperty(Constants.LOG4J_CONTEXT_SELECTOR);
if (sel != null) {
try {
Class clazz = Loader.loadClass(sel);
if (clazz != null && ContextSelector.class.isAssignableFrom(clazz)) {
selector = (ContextSelector) clazz.newInstance();
return;
}
} catch (Exception ex) {
logger.error("Unable to create context " + sel, ex);
}
}
selector = new ClassLoaderContextSelector();
}
/**
* Return the ContextSelector.
* @return The ContextSelector.
*/
public ContextSelector getSelector() {
return selector;
}
/**
* Load the LoggerContext using the ContextSelector.
* @param fqcn The fully qualified class name of the caller.
* @param currentContext If true returns the current Context, if false returns the Context appropriate
* for the caller if a more appropriate Context can be determined.
* @return The LoggerContext.
*/
public LoggerContext getContext(String fqcn, boolean currentContext) {
LoggerContext ctx = selector.getContext(fqcn, currentContext);
synchronized (ctx) {
if (recursive.get() != null || ctx.isStarted()) {
return ctx;
}
try {
recursive.set(this);
ctx.start();
return ctx;
} finally {
recursive.remove();
}
}
}
}