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我已配置为将最后 10 条消息转发到发生时。我可以在每批消息之前在日志中显示一条自定义消息吗？BufferingForwardingAppender RollingFileAppenderERROR

我想指出这是一个新ERROR事件及其上下文，以便日志可读？

我的 log4net 配置有点像这样：

<appender name="ErrorBufferingAppender" type="log4net.Appender.BufferingForwardingAppender">
  <bufferSize value="10" />
  <lossy value="true" />
  <evaluator type="log4net.Core.LevelEvaluator">
    <threshold value="ERROR" />
  </evaluator>
  <appender-ref ref="ErrorFileAppender" />
</appender>

<appender name="ErrorFileAppender" type="log4net.Appender.RollingFileAppender">
  <param name="File" value="logs\Errors.txt"/>
  <!-- other important parameters -->
  <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%date [%-4thread] %-5level %logger{1} - %message%newline"/>
  </layout>
</appender>

我想要的输出有点像这样

---------- ERROR ----------
2011-05-09 16:59:12,327 [8   ] INFO  AppLogger - DiskStorageMonitor.StartMonitoring()
2011-05-09 16:59:12,331 [8   ] INFO  AppLogger - DiskStorageMonitor.Initializing File System Watcher...
2011-05-09 16:59:12,341 [8   ] INFO  AppLogger - DiskStorageMonitor - LocalSlideDataStorageDrive: C:
2011-05-09 16:59:12,370 [8   ] INFO  AppLogger - Transition: From 'MinimumDiskSpaceQuotaState' to 'IdleState'.
2011-05-09 16:59:26,697 [8   ] INFO  AppLogger - Transition: From 'IdleState' to 'SlideHolderMacroState'.
2011-05-09 16:59:26,702 [8   ] INFO  AppLogger - Transition: From 'SlideHolderMacroState' to 'WaitingForMacroCmdResponseState'.
2011-05-09 16:59:26,781 [12  ] INFO  YStageManager - Moving to: -1.25
2011-05-09 16:59:26,782 [14  ] INFO  XStageManager - Moving to: -142
2011-05-09 16:59:30,800 [12  ] ERROR RecoveringErrorHandler - An error occurred. Retrying... (snipped exception message & stacktrace)

---------- ERROR ----------
2011-05-09 16:59:30,808 [12  ] WARN  MacroCameraRecoverySteps - An error occurred while calling the macro camera. Resetting and retrying...
2011-05-09 16:59:30,809 [12  ] INFO  MacroCameraManager - Resetting the Macro Camera.
2011-05-09 16:59:30,886 [12  ] ERROR GetMacroImageCommandHandler - Macro image processing failed for the slide in position 0. (snipped exception message & stacktrace)
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2 回答 2

2

我有一个可能对你有用的解决方案，但它有点变通。基本上，设置两个附加程序写入同一个文件。当您写入错误（这将触发缓冲区清除到您的日志文件）时，让另一个附加程序首先写入“-------Error--------”文本，并在文本。

您将不得不对其进行一些尝试才能使其正常工作，但这应该是一个可行的解决方案。Apache 确实允许多个附加程序写入同一个文件。只需确保将 +MinimalLock 放在附加程序上，这样它们就不会锁定文件。这是一个 SO 链接，它解释了两个附加程序如何写入同一个文件：

Log4net 可以有多个附加程序写入同一个文件吗？

于 2011-05-11T04:08:09.450 回答
2

感谢BiggsTRC的精彩回答。这是我的工作 log4net 配置和示例输出。

ERROR此附加程序通过在日志中写入上下文“标头”来响应任何消息。日志被最低限度地锁定以允许它和缓冲附加程序写入文件。设置为的ignoresException标签false实际上告诉 log4net此布局将写入异常（而不是在消息下方自动写入）。但我真的不希望它，那是在另一个附加程序中。

<appender name="ErrorSectionAppender" type="log4net.Appender.FileAppender">
  <filter type="log4net.Filter.LevelMatchFilter">
    <levelToMatch value="ERROR" />
  </filter>
  <filter type="log4net.Filter.DenyAllFilter" />
  <file value="logs\Errors.txt" />
  <appendToFile value="true" />
  <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
  <layout type="log4net.Layout.PatternLayout">
    <ignoresException value="false" />
    <conversionPattern value="%newline---------- ERROR @ %date ----------%newline" />
  </layout>
</appender>

此附加程序缓冲所有消息，直到出现ERROR消息，然后将最后 10 ( bufferSize) 条消息和错误消息转储到ErrorFileAppender.

<appender name="ErrorBufferingAppender" type="log4net.Appender.BufferingForwardingAppender">
  <bufferSize value="10" />
  <lossy value="true" />
  <evaluator type="log4net.Core.LevelEvaluator">
    <threshold value="ERROR" />
  </evaluator>
  <appender-ref ref="ErrorFileAppender" />
</appender>

这是实际的错误文件附加程序。转换模式是标准的。注意这里的最小文件锁。

<appender name="ErrorFileAppender" type="log4net.Appender.RollingFileAppender">
  <file value="logs\Errors.txt"/>
  <appendToFile value="true"/>
  <staticLogFileName value="true"/>
  <rollingStyle value="Size"/>
  <maxFileSize value="1048576"/>
  <maxSizeRollBackups value="-1"/>
  <countDirection value="1"/>
  <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
  <layout type="log4net.Layout.PatternLayout">
    <conversionPattern value="%date [%-4thread] %-5level %logger{1} - %message%newline"/>
  </layout>
</appender>

这些附加程序的输出如下所示

---------- ERROR @ 2011-05-13 13:51:22,632 ----------
2011-05-13 13:51:04,937 [9   ] INFO  OmnyxScannerLogger - Transition: From 'No State' to 'CommunicationSyncState'.
2011-05-13 13:51:05,363 [12  ] DEBUG IMacroImageProcessor - hello, 10
2011-05-13 13:51:05,369 [19  ] INFO  XStageManager - Connecting
2011-05-13 13:51:05,369 [12  ] INFO  ZStageManager - Connecting
2011-05-13 13:51:05,369 [16  ] INFO  YStageManager - Connecting
2011-05-13 13:51:05,393 [9   ] INFO  OmnyxScannerLogger - Transition: From 'CommunicationSyncState' to 'SystemInitializeState'.
2011-05-13 13:51:08,528 [17  ] INFO  YStageManager - Homing
2011-05-13 13:51:08,539 [12  ] INFO  ZStageManager - Homing
2011-05-13 13:51:22,632 [14  ] ERROR RecoveringErrorHandler - An error occurred. Retrying...
Omnyx.Scanner.CliContracts.ScannerException: Injected: The stage failed to home.
   at Omnyx.Scanner.Simulation.ErrorInjection.ErrorInjectionInterceptor.Intercept(IInvocation invocation) in D:\Simulation\ErrorInjection\ErrorInjectionInterceptor.cs:line 42
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.IXStageManagerProxy.Home()

---------- ERROR @ 2011-05-13 13:51:33,758 ----------
2011-05-13 13:51:29,034 [9   ] INFO  OmnyxScannerLogger - DiskStorageMonitor.StartMonitoring()
2011-05-13 13:51:29,037 [9   ] INFO  OmnyxScannerLogger - DiskStorageMonitor.Initializing File System Watcher...
2011-05-13 13:51:29,046 [9   ] INFO  OmnyxScannerLogger - DiskStorageMonitor - LocalSlideDataStorageDrive: C:
2011-05-13 13:51:29,062 [9   ] INFO  OmnyxScannerLogger - -- LocalSlideDataStorageOverhead: 0
2011-05-13 13:51:29,075 [9   ] INFO  OmnyxScannerLogger - Transition: From 'MinimumDiskSpaceQuotaState' to 'IdleState'.
2011-05-13 13:51:31,727 [9   ] INFO  OmnyxScannerLogger - Transition: From 'IdleState' to 'SlideHolderMacroState'.
2011-05-13 13:51:31,732 [9   ] INFO  OmnyxScannerLogger - Transition: From 'SlideHolderMacroState' to 'WaitingForMacroCmdResponseState'.
2011-05-13 13:51:31,792 [12  ] INFO  YStageManager - Moving to: -1.25
2011-05-13 13:51:31,793 [20  ] INFO  XStageManager - Moving to: -142
2011-05-13 13:51:33,758 [12  ] ERROR RecoveringErrorHandler - An error occurred. Retrying...
Omnyx.Scanner.CliContracts.ScannerException: Injected: The macro camera failed.
   at Omnyx.Scanner.Simulation.ErrorInjection.ErrorInjectionInterceptor.Intercept(IInvocation invocation) in D:\Simulation\ErrorInjection\ErrorInjectionInterceptor.cs:line 42
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.IMacroCameraManagerProxy.TakeTopLitAndBackLitPictures()
于 2011-05-13T18:06:31.380 回答