trying out a shutdown function

lib/log4js.js

@@ -44,6 +44,7 @@
  * Website: http://log4js.berlios.de
  */
 var events = require('events')
+, async = require('async')
 , fs = require('fs')
 , path = require('path')
 , util = require('util')
@@ -301,6 +302,24 @@ function loadAppender(appender) {
   appenderMakers[appender] = appenderModule.configure.bind(appenderModule);
 }
 
+function shutdown(cb) {
+  var allAppenders = Object.keys(appenders).reduce(
+    function(accum, category) {
+      return accum.concat(appenders[category]);
+    }, []);
+  async.forEach(
+    allAppenders,
+    function(appender, done) {
+      if (appender.shutdown) {
+        appender.shutdown(done);
+      } else {
+        done();
+      }
+    },
+    cb
+  );
+}
+
 module.exports = {
   getLogger: getLogger,
   getDefaultLogger: getDefaultLogger,
@@ -309,6 +328,7 @@ module.exports = {
   loadAppender: loadAppender,
   clearAppenders: clearAppenders,
   configure: configure,
+  shutdown: shutdown,
   
   replaceConsole: replaceConsole,
   restoreConsole: restoreConsole,