org.springframework.boot.devtools.log4j2.Log4J2RestartListener Maven / Gradle / Ivy
/*
* Copyright 2012-2015 the original author or authors.
*
* 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.springframework.boot.devtools.log4j2;
import java.lang.reflect.Field;
import java.util.Collection;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.util.Cancellable;
import org.apache.logging.log4j.core.util.ShutdownCallbackRegistry;
import org.apache.logging.log4j.spi.LoggerContextFactory;
import org.springframework.boot.devtools.restart.RestartListener;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
/**
* {@link RestartListener} that prepares Log4J2 for an application restart.
*
* @author Andy Wilkinson
* @since 1.3.0
*/
public class Log4J2RestartListener implements RestartListener {
@Override
public void beforeRestart() {
if (ClassUtils.isPresent("org.apache.logging.log4j.core.impl.Log4jContextFactory",
getClass().getClassLoader())) {
prepareLog4J2ForRestart();
}
}
private void prepareLog4J2ForRestart() {
LoggerContextFactory factory = LogManager.getFactory();
Field field = ReflectionUtils.findField(factory.getClass(),
"shutdownCallbackRegistry");
ReflectionUtils.makeAccessible(field);
ShutdownCallbackRegistry shutdownCallbackRegistry = (ShutdownCallbackRegistry) ReflectionUtils
.getField(field, factory);
Field hooksField = ReflectionUtils.findField(shutdownCallbackRegistry.getClass(),
"hooks");
ReflectionUtils.makeAccessible(hooksField);
@SuppressWarnings("unchecked")
Collection hooks = (Collection) ReflectionUtils
.getField(hooksField, shutdownCallbackRegistry);
hooks.clear();
}
}