How to use the log4js.loadAppender function in log4js

logger = N.logger;
      }

      loggers[name] = logger;
    }

    return loggers[name] || log4js.getLogger(name);
  };

  //
  // Load supported appenders
  //

  log4js.loadAppender('file');
  log4js.loadAppender('console');
  log4js.loadAppender('logLevelFilter');

  //
  // Helper that returns thresholded appender
  // Resulting appender will log event with level => given `threshold` only
  //

  function thresholdedAppender(threshold, appender) {
    var level = baseLevel;

    if (threshold) {
      level = log4js.levels.toLevel(threshold, baseLevel);

      // get upper threshold
      level = level.isGreaterThanOrEqualTo(baseLevel) ? level : baseLevel;
    }

if (!logger) {
        N.logger.warn('Logger <' + name + '> not found. Using .');
        logger = N.logger;
      }

      loggers[name] = logger;
    }

    return loggers[name] || log4js.getLogger(name);
  };

  //
  // Load supported appenders
  //

  log4js.loadAppender('file');
  log4js.loadAppender('console');
  log4js.loadAppender('logLevelFilter');

  //
  // Helper that returns thresholded appender
  // Resulting appender will log event with level => given `threshold` only
  //

  function thresholdedAppender(threshold, appender) {
    var level = baseLevel;

    if (threshold) {
      level = log4js.levels.toLevel(threshold, baseLevel);

      // get upper threshold
      level = level.isGreaterThanOrEqualTo(baseLevel) ? level : baseLevel;

const static = require('koa-static');
const mount = require('koa-mount');
const log4js = require('log4js');
const through2 = require('through2');
const mongoose = require('mongoose');
const redis = require('./utils/redis');
const cors = require('kcors');


const CONFIG = require('./config/config');

// init logger

//console log is loaded by default, so you won't normally need to do this
// log4js.loadAppender('console');
log4js.loadAppender('file');
// log4js.addAppender(log4js.appenders.console());
const date = new Date();
log4js.addAppender(log4js.appenders.file(path.resolve(__dirname, `logs/${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}.log`)));

const logger = log4js.getLogger('Core');
logger.setLevel('Debug');

// logger.trace('Entering cheese testing');
// logger.debug('Got cheese.');
// logger.info('Cheese is Gouda.');
// logger.warn('Cheese is quite smelly.');
// logger.error('Cheese is too ripe!');
// logger.fatal('Cheese was breeding ground for listeria.');

logger.info('Server starting...');

if (!chosenLogger) {
      N.logger.warn('Logger <%s> not found. Using .', name);
      chosenLogger = N.logger;
    }

    channels[name] = chosenLogger; // cache
    return chosenLogger;
  };

  //
  // Load supported appenders
  //

  log4js.loadAppender('file');
  log4js.loadAppender('console');
  log4js.loadAppender('clustered');
  log4js.loadAppender('logLevelFilter');

  //
  // clear default loggers
  //

  log4js.clearAppenders();

  function clusteredAppender(children, category) {
    let clusterAppenderConfig = {
      appenders: [],      // configs
      actualAppenders: [] // functions
    };

    children.forEach(appender => {

addFileAppender: function(path) {
    if (!log4js.appenders.file) {
      log4js.loadAppender('file');
    }

    var appender = log4js.appenders.file(path, null /* default layout*/, 2097152 /* 2mb max size */, 1 /* 1 backup */);
    var filter = new logLevelFilter('INFO', appender);
    log4js.addAppender(filter);
  },

if (!chosenLogger) {
      N.logger.warn('Logger <%s> not found. Using .', name);
      chosenLogger = N.logger;
    }

    channels[name] = chosenLogger; // cache
    return chosenLogger;
  };

  //
  // Load supported appenders
  //

  log4js.loadAppender('file');
  log4js.loadAppender('console');
  log4js.loadAppender('clustered');
  log4js.loadAppender('logLevelFilter');

  //
  // clear default loggers
  //

  log4js.clearAppenders();

  function clusteredAppender(children, category) {
    let clusterAppenderConfig = {
      appenders: [],      // configs
      actualAppenders: [] // functions
    };

    children.forEach(appender => {
      clusterAppenderConfig.appenders.push({ category });

module.exports = function (next) {
  log4js.loadAppender('file');

  log4js.addAppender(log4js.appenders.file(
    require('path').join(LOGS_PATH, nodeca.runtime.env + '.log')
  ), 'general');

  nodeca.logger = log4js.getLogger('general');
  next();
};

//DEBUG OPTIONS
GLOBAL.debug_sequelize_enabled = false;//Default: false
GLOBAL.debug_tweets = false;//Default: false
//END DEBUG OPTIONS

//setup Dependencies
var connect = require('connect')
    , express = require('express')
    , http = require('http')
    , port = (process.env.PORT || 8081)
    , log4js = require('log4js');

log4js.replaceConsole();

log4js.loadAppender('file');

log4js.addAppender(log4js.appenders.file('logs/footweet.log'), 'footweet');

GLOBAL.logger = log4js.getLogger('footweet');


GLOBAL.db = require('./storage/DatabaseConnection');

//Setup Express
var app = express();
var server = http.createServer(app);
app.configure(function(){
    app.set('views', __dirname + '/views');
    app.set('view options', { layout: false });
    app.use(connect.bodyParser());
    app.use(express.cookieParser());

* Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
const path = require('path');

const log4js = require('log4js');
const conf = require('./conf');

if (process.env.NODE_ENV === 'development') {
  log4js.setGlobalLogLevel('debug');
} else if (process.env.NODE_ENV === 'production') {
  log4js.setGlobalLogLevel(process.env.LOG_LEVEL || 'info');
}

log4js.replaceConsole();
log4js.loadAppender('console');
log4js.loadAppender('file');

const set = new Set();
const logFile = log4js.appenders.file(
  path.join(__dirname, conf.logger.relativePath)
);

log4js.addLogger = name => {
  if (!set.has(name)) {
    set.add(name);
    log4js.addAppender(logFile, name);
  }
  return log4js.getLogger(name);
};

const signupFile = log4js.appenders.file(
  path.join(__dirname, '/../logs/signuplog.log')

function getLogger(dir){
    log4js.loadAppender('file');
    log4js.appenders['TASK'] = [];
    var appender = log4js.appenders.file(dir + "/tast.log");
    if(log4js.hasLogger("TASK")){
        log4js.getLogger('TASK').removeAllListeners();
    }
    log4js.addAppender(appender,'TASK');
    return log4js.getLogger('TASK');
}