trying out weak references, don't think they're going to help

lib/log4js.js

@@ -44,6 +44,7 @@
  * Website: http://log4js.berlios.de
  */
 var debug = require('./debug')('core')
+, weak = require('weak')
 , fs = require('fs')
 , path = require('path')
 , util = require('util')
@@ -51,7 +52,9 @@ var debug = require('./debug')('core')
 , levels = require('./levels')
 , LoggingEvent = require('./logger').LoggingEvent
 , Logger = require('./logger').Logger
+, loggerRefs = []
 , categoryLevels = {}
+, globalLogLevel = null
 , ALL_CATEGORIES = '[all]'
 , appenders = {}
 , appenderMakers = {}
@@ -63,21 +66,31 @@ var debug = require('./debug')('core')
 };
 
 /**
- * Get a logger instance. Instance is cached on categoryName level.
+ * Get a logger instance. 
  * @param  {String} categoryName name of category to log to.
  * @return {Logger} instance of logger for the category
  * @static
  */
 function getLogger (categoryName) {
+  var level, logger, ref;
 
   // Use default logger if categoryName is not specified or invalid
   if (typeof categoryName !== "string") {
     categoryName = Logger.DEFAULT_CATEGORY;
   }
 
-  debug("getLogger(" + categoryName + ")");
+  level = categoryLevels[categoryName];
 
-  return new Logger(categoryName, categoryLevels[categoryName] || null, dispatch);
+  if (globalLogLevel) {
+    level = globalLogLevel;
+  }
+
+  debug("getLogger(" + categoryName + ") - level is " + level);
+  logger = new Logger(categoryName, level || null, dispatch);
+  ref = weak(logger);
+  loggerRefs.push(ref);
+
+  return logger;
 }
 
 /**
@@ -134,7 +147,16 @@ function configureLevels(levels) {
 }
 
 function setGlobalLogLevel(level) {
-  Logger.prototype.level = levels.toLevel(level, levels.TRACE);
+  //Logger.prototype.level = levels.toLevel(level, levels.TRACE);
+  globalLogLevel = level;
+  var workingRefs = [];
+  loggerRefs.forEach(function(logger) {
+    if (logger.setLevel) {
+      workingRefs.push(logger);
+      logger.setLevel(level);
+    }
+  });
+  loggerRefs = workingRefs;
 }
 
 /**