com.wavefront.common.logger.DelegatingLogger Maven / Gradle / Ivy
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package com.wavefront.common.logger;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
/**
* Base class for wrapping delegating loggers.
*
* @author [email protected]
*/
public abstract class DelegatingLogger extends Logger {
protected final Logger delegate;
/**
* @param delegate Delegate logger.
*/
public DelegatingLogger(Logger delegate) {
super(delegate.getName(), null);
this.delegate = delegate;
}
/**
* @param level log level.
* @param message string to write to log.
*/
@Override
public abstract void log(Level level, String message);
/**
* @param logRecord log record to write to log.
*/
@Override
public void log(LogRecord logRecord) {
logRecord.setLoggerName(delegate.getName());
inferCaller(logRecord);
delegate.log(logRecord);
}
/**
* This is a JDK8-specific implementation. TODO: switch to StackWalker after migrating to JDK9+
*/
private void inferCaller(LogRecord logRecord) {
StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
boolean lookingForLogger = true;
for (StackTraceElement frame : stackTraceElements) {
String cname = frame.getClassName();
if (lookingForLogger) {
// Skip all frames until we have found the first logger frame.
if (cname.endsWith("Logger")) {
lookingForLogger = false;
}
} else {
if (!cname.endsWith("Logger") && !cname.startsWith("java.lang.reflect.") &&
!cname.startsWith("sun.reflect.")) {
// We've found the relevant frame.
logRecord.setSourceClassName(cname);
logRecord.setSourceMethodName(frame.getMethodName());
return;
}
}
}
}
}