搜索

此内容没有您所选择的语言版本。

Chapter 9. Logging

download PDF

Logging is important in troubleshooting and debugging. By default logging is turned off. To enable logging, you must set a logging level and provide a delegate function to receive the log messages.

9.1. Setting the log output level

The library emits log traces at different levels:

  • Error
  • Warning
  • Information
  • Verbose

The lowest log level, Error, traces only error events and produces the fewest log messages. A higher log level includes all the log levels below it and generates a larger volume of log messages.

// Enable Error logs only.
Trace.TraceLevel = TraceLevel.Error
// Enable Verbose logs. This includes logs at all log levels.
Trace.TraceLevel = TraceLevel.Verbose

9.2. Enabling protocol logging

The Log level Frame is handled differently. Setting trace level Frame enables tracing outputs for AMQP protocol headers and frames.

Tracing at one of the other log levels must be logically ORed with Frame to get normal tracing output and AMQP frame tracing at the same time. For example

// Enable just AMQP frame tracing
Trace.TraceLevel = TraceLevel.Frame;
// Enable AMQP Frame logs, and Warning and Error logs
Trace.TraceLevel = TraceLevel.Frame | TraceLevel.Warning;

The following code writes AMQP frames to the console.

Example: Logging delegate

Trace.TraceLevel = TraceLevel.Frame;
Trace.TraceListener = (f, a) => Console.WriteLine(
        DateTime.Now.ToString("[hh:mm:ss.fff]") + " " + string.Format(f, a));

Red Hat logoGithubRedditYoutubeTwitter

学习

尝试、购买和销售

社区

关于红帽文档

通过我们的产品和服务,以及可以信赖的内容,帮助红帽用户创新并实现他们的目标。

让开源更具包容性

红帽致力于替换我们的代码、文档和 Web 属性中存在问题的语言。欲了解更多详情,请参阅红帽博客.

關於紅帽

我们提供强化的解决方案,使企业能够更轻松地跨平台和环境(从核心数据中心到网络边缘)工作。

© 2024 Red Hat, Inc.