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CHAPTER 2 LOGGING, ERRORS, AND TEST-DRIVEN DEVELOPMENT
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<appender name="ErrorAppender" type="log4net.Appender.ConsoleAppender"> <layout type="log4net.Layout.SimpleLayout" /> </appender> The destination PanicAppender has a built-in filter that s defined by the XML child element filter. The purpose of the filter element is to process only those priorities that apply to the context. In the overall scheme of things, the PanicAppender is meant for big problems, so when a FATAL priority message is generated, it s sent via an e-mail. The ErrorAppender has no filter defined, so it processes all messages sent to it. Using this approach, you can define multiple destinations in a configuration that processes different priorities. Having said all that, some people would consider ERROR and FATAL priorities to have equal importance for paying-attention purposes. To generate a strong, but not high-importance message, use the WARN priority. You define a modified root configuration as follows: <root> <level value="WARN" /> <appender-ref ref="ProblemAppender" /> <appender-ref ref="PanicAppender" /> </root> The difference in the redefined root configuration definition is that the WARN, ERROR, and FATAL message priorities are processed. However, don t confuse ERROR and FATAL priorities as being identical priorities. A FATAL priority is when the application is exiting or is about to crash. An ERROR priority is when the application is still functioning, but doesn t have a correct state. When an ERROR priority message has been sent, the application executes and functions with a fallback configuration. When an application is executing after an ERROR priority message, immediate attention is needed, but at least the application might still be running. With the modified priority, the PanicAppender destination is modified to filter a priority with a levelMin of ERROR, and a levelMax of FATAL. An example of how you could use this new priority is the monitoring of hard disk space. A message of priority WARN would be sent if a hard disk has less than 100MB. The priority WARN is used because the application can execute without any difficulties. When the hard disk has less than 10MB left, a message of priority ERROR is sent. The application can still execute, but conditions are becoming complicated, and the application could potentially crash or be forcibly exited. Finally, a message of priority FATAL is sent when less than 1MB is left on the hard disk. When less than 1MB of space is on the hard disk, the application cannot continue to function and must exit before other problems occur. The modified configuration that started with WARN is a usual ideal root configuration because all important information is logged, but not so much that the information becomes too large. All priorities below WARN are additional troubleshooting priorities, and should be designated as a custom configuration, as illustrated by the following example definitions: <logger name="logger.tracer " additivity="false"> <level value="DEBUG" /> <appender-ref ref="TracerAppender" /> </logger> The logger definition logger.production has no child elements and inherits all the definitions from the root. The logger.tracer definition has an additivity of false to indicate that
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CHAPTER 2 LOGGING, ERRORS, AND TEST-DRIVEN DEVELOPMENT
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none of the root information should be used. Within the logger.tracer logger element are the definitions of the priority and the message destination. In a big-picture sense, the purpose of this example configuration illustrates how an administrator and developer define the default streams used in an application. You use the identifier logger.tracer to log debug messages, as reflected by the DEBUG priority. In coding terms, the developer would load multiple ILog instances, reflected by the priority and purpose of the log message to send. The log messages could be further refined to specific assemblies or application functionalities. By subdividing the logging, it s possible to keep an eye on specific pieces of the application while ignoring the other parts. Subdivision makes it possible for an administrator to react quickly to potential problems. A bad idea is to generate only one stream that contains all logging output. That s a recipe for confusion.
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