org.springframework.boot.logging.LoggingSystem 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.logging;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.util.ClassUtils;
/**
* Common abstraction over logging systems.
*
* @author Phillip Webb
* @author Dave Syer
* @author Andy Wilkinson
*/
public abstract class LoggingSystem {
private static final Map SYSTEMS;
static {
Map systems = new LinkedHashMap();
String pkg = LoggingSystem.class.getPackage().getName();
systems.put("ch.qos.logback.core.Appender", pkg + ".logback.LogbackLoggingSystem");
systems.put("org.apache.log4j.PropertyConfigurator", pkg
+ ".log4j.Log4JLoggingSystem");
systems.put("java.util.logging.LogManager", pkg + ".java.JavaLoggingSystem");
SYSTEMS = Collections.unmodifiableMap(systems);
}
/**
* Reset the logging system to be limit output. This method may be called before
* {@link #initialize()} to reduce logging noise until the systems has been full
* Initialized.
*/
public abstract void beforeInitialize();
/**
* Initialize the logging system using sensible defaults. This method should generally
* try to find system specific configuration on classpath before falling back to
* sensible defaults.
*/
public abstract void initialize();
/**
* Initialize the logging system from a logging configuration location.
* @param configLocation a log configuration location
*/
public abstract void initialize(String configLocation);
/**
* Clean up the logging system. The default implementation does nothing. Subclasses
* should override this method to perform any logging system-specific cleanup.
*/
public void cleanUp() {
}
/**
* Sets the logging level for a given logger.
* @param loggerName the name of the logger to set
* @param level the log level
*/
public abstract void setLogLevel(String loggerName, LogLevel level);
/**
* Detect and return the logging system in use.
* @return The logging system
*/
public static LoggingSystem get(ClassLoader classLoader) {
for (Map.Entry entry : SYSTEMS.entrySet()) {
if (ClassUtils.isPresent(entry.getKey(), classLoader)) {
try {
Class systemClass = ClassUtils.forName(entry.getValue(),
classLoader);
return (LoggingSystem) systemClass.getConstructor(ClassLoader.class)
.newInstance(classLoader);
}
catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
}
throw new IllegalStateException("No suitable logging system located");
}
}