/*
* 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.tomee.jul.formatter.log;
import org.apache.juli.logging.Log;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.atomic.AtomicReference;
public final class ReloadableLog {
public static final Class<?>[] INTERFACES = new Class<?>[]{Log.class};
private ReloadableLog() {
// no-op
}
public static Log newLog(final String name, final String factory) {
return Log.class.cast(Proxy.newProxyInstance(
ReloadableLog.class.getClassLoader(), INTERFACES, new ReloadableLogHandler(factory, name)));
}
private static final class ReloadableLogHandler implements InvocationHandler {
private static final String LOG4J_IMPL = "org.apache.tomee.loader.log.Log4jLog";
private static final String LOG4J2_IMPL = "org.apache.tomee.loader.log.Log4j2Log";
private static final String SLF4J_IMPL = "org.apache.tomee.loader.log.Slf4jLog";
private static final String MAVEN_IMPL = "org.apache.openejb.maven.util.TomEEMavenLog";
private volatile String factory;
private final String name;
private final AtomicReference<Log> delegate = new AtomicReference<>();
private volatile boolean done = false;
public ReloadableLogHandler(final String factory, final String name) {
this.factory = factory;
this.name = name;
initDelegate();
}
private Log initDelegate() {
if (done) {
return delegate.get();
}
try {
if (factory == null) {
final String f = TomEELog.getLoggerClazz();
if (f != null) {
factory = f;
}
final Log log = delegate.get();
if (factory == null && log != null) {
return log;
}
}
switch (factory) {
case "org.apache.openejb.util.Log4jLogStreamFactory":
delegate.set(newInstance(LOG4J_IMPL));
break;
case "org.apache.openejb.util.Log4j2LogStreamFactory":
delegate.set(newInstance(LOG4J2_IMPL));
break;
case "org.apache.openejb.util.Slf4jLogStreamFactory":
delegate.set(newInstance(SLF4J_IMPL));
break;
case "org.apache.openejb.maven.util.MavenLogStreamFactory":
delegate.set(newInstance(MAVEN_IMPL));
break;
default:
delegate.set(new JULLogger(name));
}
done = true;
} catch (final Throwable the) {
if (delegate.get() == null) {
delegate.set(new JULLogger(name));
}
}
return delegate.get();
}
private Log newInstance(final String impl) throws InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException, ClassNotFoundException {
return Log.class.cast(Thread.currentThread()
.getContextClassLoader()
.loadClass(impl)
.getConstructor(String.class)
.newInstance(name));
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
try {
return method.invoke(initDelegate(), args);
} catch (final InvocationTargetException ite) {
throw ite.getCause();
}
}
}
}