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package com.btr.proxy.util;
import java.text.MessageFormat;
/*****************************************************************************
* Simple logging support for the framework.
* You need to add an logging listener that needs to send the logging events
* to an backend.
*
* @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
****************************************************************************/
public class Logger {
public enum LogLevel {ERROR, WARNING, INFO, TRACE, DEBUG}
/*****************************************************************************
* Interface for an logging backend that can be attached to the logger.
****************************************************************************/
public interface LogBackEnd {
/*************************************************************************
* Invoked for every logging event.
* @param clazz the class that sends the log message.
* @param loglevel the logging level.
* @param msg the message format string.
* @param params the message parameters for the format string.
************************************************************************/
public void log(Class<?> clazz, LogLevel loglevel, String msg, Object ...params);
/*************************************************************************
* Can be used to test if a given logging level is enabled.
* @param logLevel the loglevel to test.
* @return true if enabled, else false.
************************************************************************/
public boolean isLogginEnabled(LogLevel logLevel);
}
private static LogBackEnd backend;
/*************************************************************************
* Gets the currently attached logging backend.
* @return Returns the backend.
************************************************************************/
public static LogBackEnd getBackend() {
return backend;
}
/*************************************************************************
* Attaches a new logging backend replacing the existing one.
* @param backend The backend to set.
************************************************************************/
public static void setBackend(LogBackEnd backend) {
Logger.backend = backend;
}
/*************************************************************************
* Logs a message.
* @param clazz the class that sends the log message.
* @param loglevel the logging level.
* @param msg the message format string.
* @param params the message parameters for the format string.
************************************************************************/
public static void log(Class<?> clazz, LogLevel loglevel, String msg, Object ...params) {
System.out.println(MessageFormat.format(msg, params));
}
/*************************************************************************
* Can be used to test if a given logging level is enabled.
* @param logLevel the loglevel to test.
* @return true if enabled, else false.
************************************************************************/
public static boolean isLogginEnabled(LogLevel logLevel) {
if (backend != null) {
return backend.isLogginEnabled(logLevel);
}
return false;
}
}
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