using log4net;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LogServer
{
    /// <summary>
    /// Logger 工厂
    /// </summary>
    class LoggerFactory
    {
        private static Dictionary<string, ILog> dicLog = new Dictionary<string, ILog>();

        /// <summary>
        /// 创建实例 ，默认读取App_Data 下的log4net.config文件
        /// </summary>
        /// <param name="loggerName"></param>
        /// <returns></returns>
        public static ILog CreateInstance(string loggerName)
        {
            return CreateInstance(loggerName, null);
        }
        /// <summary>
        /// 创建实例
        /// </summary>
        /// <param name="loggerName"></param>
        /// <param name="configFilename">log4net.config文件路径</param> 
        /// <returns></returns>
        public static ILog CreateInstance(string loggerName, string configFilename)
        {
            if (!dicLog.ContainsKey(loggerName))
            {
                if (string.IsNullOrWhiteSpace(configFilename))
                {
                    configFilename = Directory.GetParent(AppDomain.CurrentDomain.BaseDirectory).FullName + "\\App_Data\\configs\\log4net.config";
                }
                log4net.Config.XmlConfigurator.Configure(new FileInfo(configFilename));
                //从配置文件中读取Logger对象  
                //WebLogger 里面的配置信息是用来将日志录入到数据库的
                //做为扩展 做判断来确定日志的记录形式，数据库也好，txt文档也好，控制台程序也好。
                var log = log4net.LogManager.GetLogger(loggerName);

                //防止并发出错
                if (!dicLog.ContainsKey(loggerName))
                {
                    dicLog.Add(loggerName, log);
                }
                return log;
            }
            else
            {
                return dicLog[loggerName];
            }
        }
    }
}