log4net:运行时不同文件appender上的不同日志

Question

早上好家伙.

我写了一个单一的C#2.0应用程序(称之为myapp).
Myapp被多次调用,并且在每次调用时都会生成一种将在分离的线程中执行的"任务".
如果您在短时间内多次调用myapp,则任务将并行执行.

通常我使用log4net进行日志记录; 我配置它XmlConfigurator.Configure(<config>.xml)在启动时加载一个xml文件,然后我LogManager.GetLogger(name)在每个需要记录器的类中使用static ,非常简单.

相反,这种情况具有挑战性.我需要做的是:根据每次调用收到的args之一(称之为arg),我需要获得一个不同的RollingFileAppender,它记录在不同的文件中,例如.log.

举个例子:

第一次调用:myapp.exe -arg:01
- myapp创建thread1
- 将一个新的RollingFileAppender设置为01.log文件,如果不存在
- 该线程中使用的对象必须登录01.log文件

第二次调用:myapp.exe -arg:02
- 创建thread2
- 将一个新的RollingFileAppender设置为02.log文件,如果不存在
- 该线程中使用的对象必须登录02.log文件,但不能登录到log.01

第3次调用:myapp.exe -arg:01
- 创建thread03
- 将RollingFileAppender获取到01.log文件(它已经存在!)
- 此线程中使用的对象必须登录01.log文件,但不能登录到log.02

等等.我不需要将RollingAppender的配置保留在xml文件中,我可以通过编程方式创建它; 我的想法是使用一个静态包装器类,称之为LogHelper,如果基于arg不存在则创建appender ,并且当对象需要时(在类中我会使用类似的东西ILog log = LogHelper.GetLogger(name, arg)调度正确的ILog,以获取记录器使用而不是默认的log4net方法LogManager.GetLogger(name)).因此,如果我在2个不同的线程中有2个相同类的istances,当我记录每个文件的消息时,取决于或者arg(如果需要,我将在每个对象中注入arg).

我在StackOverflow中浏览了很多线程,但我找不到解决方案.

有人能指出我正确的方向吗？

提前致谢.

Answer 1

我最终得到了一个略有不同的解决方案.
我创建了一个LogMaster类似于默认log4net LogManager类的静态类(对于可怜的名字而言).
不同之处在于您可以ILog根据以下内容获得不同的结果arg:LogMaster将为您将使用的ILoggerRepository每个不同创建一个新的arg.

这里的代码:

#region Usings
using System;
using System.IO;

using log4net;
using log4net.Appender;
using log4net.Config;
using log4net.Core;
using log4net.Filter;
using log4net.Layout;
using log4net.Repository;
using log4net.Repository.Hierarchy;


#endregion


namespace Common.Voyager
{
    /// <summary>
    /// A static class that emulates defualt log4net LogManager static class.
    /// The difference is that you can get various loggers istances based from an args.
    /// LogMaster will create a different logger repository for each new arg it will receive.
    /// </summary>
    public static class LogMaster
    {
        #region Const
        private const string RollingFileAppenderNameDefault = "Rolling";
        private const string MemoryAppenderNameDefault = "Memory";
        #endregion


        #region Constructors
        static LogMaster()
        {
        }
        #endregion


        #region Public Methods
        public static ILog GetLogger(string arg, string name)
        {
            //It will create a repository for each different arg it will receive
            var repositoryName = arg;

            ILoggerRepository repository = null;

            var repositories = LogManager.GetAllRepositories();
            foreach (var loggerRepository in repositories)
            {
                if (loggerRepository.Name.Equals(repositoryName))
                {
                    repository = loggerRepository;
                    break;
                }
            }

            Hierarchy hierarchy = null;
            if (repository == null)
            {
                //Create a new repository
                repository = LogManager.CreateRepository(repositoryName);

                hierarchy = (Hierarchy)repository;
                hierarchy.Root.Additivity = false;

                //Add appenders you need: here I need a rolling file and a memoryappender
                var rollingAppender = GetRollingAppender(repositoryName);
                hierarchy.Root.AddAppender(rollingAppender);

                var memoryAppender = GetMemoryAppender(repositoryName);
                hierarchy.Root.AddAppender(memoryAppender);

                BasicConfigurator.Configure(repository);
            }

            //Returns a logger from a particular repository;
            //Logger with same name but different repository will log using different appenders
            return LogManager.GetLogger(repositoryName, name);
        }
        #endregion


        #region Private Methods
        private static IAppender GetRollingAppender(string arg)
        {
            var level = Level.All;

            var rollingFileAppenderLayout = new PatternLayout("%date{HH:mm:ss,fff}|T%2thread|%25.25logger|%5.5level| %message%newline");
            rollingFileAppenderLayout.ActivateOptions();

            var rollingFileAppenderName = string.Format("{0}{1}", RollingFileAppenderNameDefault, arg);

            var rollingFileAppender = new RollingFileAppender();
            rollingFileAppender.Name = rollingFileAppenderName;
            rollingFileAppender.Threshold = level;
            rollingFileAppender.CountDirection = 0;
            rollingFileAppender.AppendToFile = true;
            rollingFileAppender.LockingModel = new FileAppender.MinimalLock();
            rollingFileAppender.StaticLogFileName = true;
            rollingFileAppender.RollingStyle = RollingFileAppender.RollingMode.Date;
            rollingFileAppender.DatePattern = ".yyyy-MM-dd'.log'";
            rollingFileAppender.Layout = rollingFileAppenderLayout;
            rollingFileAppender.File = string.Format("{0}.{1}", "log", arg);
            rollingFileAppender.ActivateOptions();

            return rollingFileAppender;
        }

        private static IAppender GetMemoryAppender(string station)
        {
            //MemoryAppender
            var memoryAppenderLayout = new PatternLayout("%date{HH:MM:ss} | %message%newline");
            memoryAppenderLayout.ActivateOptions();

            var memoryAppenderWithEventsName = string.Format("{0}{1}", MemoryAppenderNameDefault, station);
            var levelRangeFilter = new LevelRangeFilter();
            levelRangeFilter.LevelMax = Level.Fatal;
            levelRangeFilter.LevelMin = Level.Info;

            var memoryAppenderWithEvents = new MemoryAppenderWithEvents();
            memoryAppenderWithEvents.Name = memoryAppenderWithEventsName;
            memoryAppenderWithEvents.AddFilter(levelRangeFilter);
            memoryAppenderWithEvents.Layout = memoryAppenderLayout;
            memoryAppenderWithEvents.ActivateOptions();

            return memoryAppenderWithEvents;
        }
        #endregion
    }
}

用法:

var arg = "myArg";
var loggerName = "MyLogger";
var log = LogMaster.GetLogger(arg, loggerName);

使用此解决方案,您可以从检索ILog记录器的默认LogManager行为中受益:如果存储库中已存在具有相同名称的记录器,您将获得该等记录(回收行为).

谢谢@ making3的建议!