消息记录器，用于通过文件和数据库执行记录、跟踪和审计。

Message Logger for logging, tracing, and auditing via files and databases.

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甚至当跟踪禁用时，您的代码将在每个跟踪点至少调用一个日志记录器方法。

Even when trace is disabled, your code will call at least one logger method per trace point.

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把异常添加到跟踪日志记录器(清单3)打印出错误消息和完整的堆栈跟踪。

Adding an exception to the trace logger (Listing 3) prints the error message along with a full stack trace.

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