如何配置netty logger工厂以查看LoggingHandler的输出? [英] How to configure netty logger factory in order to see the output of LoggingHandler?

问题描述

我正在使用slf4j和logback进行日志记录，并且在我编写的应用程序开始时

I am using slf4j logging with logback and at the beginning of my app I wrote

InternalLoggerFactory.setDefaultFactory(new Slf4JLoggerFactory());

然后将新的LoggingHandler(InternalLogLevel.DEBUG)实例添加到管道中. 不幸的是，它仍然没有记录任何内容，我正在调试中，而调试级别是问题所在，只是跳过了记录本身.

then I added to the pipeline a new LoggingHandler(InternalLogLevel.DEBUG) instance. Unfortunately, this still does not log anything, I was debugging into and the debug level is the problem, just skips the logging itself.

我应该如何设置才能使用此LoggingHandler?

How should I setup to get working this LoggingHandler?

推荐答案

我做了一个小例子，它确实有效-我将其放在要点在github 上.它使用logback作为slf4j的后端.应该注意的时刻是:

I have done a small example, that does work - I placed it on gist on github. It uses logback as the backend of the slf4j. The moments that should be paid attention to are:

• InternalLoggerFactory.setDefaultFactory(Slf4JLoggerFactory.INSTANCE);应该直接在程序的入口点执行.有时候，这个入口点"可能很难确定.
• 正确配置slf4j后端.由于slf4j只是一个包装器，它根本不处理配置-它特定于log4j，logback或java.util.logging(或者可能是一些自定义后端-我已经大量使用了自定义的"java commons logging"配置器，因此真的可以使用任何东西)

• 即使没有LoggingHandler，您也应该从org.jboss.netty.channel.socket.nio.SelectorUtil(Netty版本3.6.0.Final)的静态初始化程序中看到两条调试消息:

• InternalLoggerFactory.setDefaultFactory(Slf4JLoggerFactory.INSTANCE); should be executed right on the entry point of your program. Sometimes this "entry point" may be very hard to determine.
• Proper configuration of slf4j backend. Since slf4j is only a wrapper it does not deal with configuration at all - it is specific for log4j, logback or java.util.logging (or maybe some custom backend - I have worked heavily with the custom "java commons logging" configurator, so really anything really can be used)

• Even without LoggingHandler you should see two debug messages from static initializer of org.jboss.netty.channel.socket.nio.SelectorUtil (with Netty version 3.6.0.Final):

11:54:00.959 [main] DEBUG o.j.n.c.socket.nio.SelectorUtil - Using select timeout of 500
11:54:00.962 [main] DEBUG o.j.n.c.socket.nio.SelectorUtil - Epoll-bug workaround enabled = false

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