There is already a LogFactory that seems to do exactly as you suggest.
http://jakarta.apache.org/commons/logging/api/org/apache/commons/logging/Log
Factory.html
James
----- Original Message -----
From: "Manfred Wolff" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, July 15, 2002 11:09 AM
Subject: Logger Framework
>
> Hello
>
> First: The common-loggin framework is a good idea to have an abstract
layer
> over some logging APIs. The factory is also fine and I use both in a
> comercial project.
>
> The Problem: In evry real class you have to specific, what kind of logger
> you will get. e.g.
>
> private static final Log logger = new
> Log4JCategoryLog("my.package.name.classname");
>
> or perhaps you may use the factory e.g. Log4jFactory. Just a good idea is
it
> to have a Log4JLoggerLog instead of CategoryLog!
>
> Unfortunatly it is not possible to have an abstract factory that offers
you
> a log-implementation as configured. If this were possible, you may
> configure at a central point of your application what kind of logger you
> will have and the abstract factory may manage it by bypassing the request
to
> the real logger. Thus factory may be seen as follow:
>
> public class LoggerFactory {
>
> static int initialized = -1;
> public static final int SIMPLE = 1;
> public static final int LOG4J = 2;
>
> private int loglevel;
> private Log4jFactory factory;
>
> /**
> * Initialized the logging framework
> * @param aKind Which kind of framework is wanted
> * @param aInitProperties Properties for the framework
> */
> public static void initLog(int aKind, Properties aInitProperties ) {
>
> if (initialize != -1) return;
>
> switch (aKind) {
>
> case SIMPLE:
> Integer ilogLevel = (Integer)
aInitProperties.get("level");
> logLevel = ilogLevel.intValue();
> initialize = SIMPLE;
> break;
>
> case LOG4J:
> PropertyConfigurator.configure(aInitProperties);
> initialize = LOG4J;
> factory = new Log4jFactory();
> break;
> }
> }
>
>
> /**
> * Factorymethod to get an logger as configured
> * @param aLoggerName The name of the logger
> * @return A Log interface
> */
> public static Log getLogger(String aLoggerName) {
>
> switch (initialize) {
> case SIMPLE: // if configured SIMPLE Log
> SimpleLog sl = new SimpleLog(aLoggerName);
> sl.setLevel(logLevel);
> return sl;
> case LOG4J: // if configured Log4J
> return factory.getInstance(aLoggerName);
> }
> return new NoOpLog(aLoggerName);
> }
>
> I think, this may be a great extension to the common-logger framework.
>
> Manfred
>
>
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