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Date: Mon, 9 Aug 2010 00:52:39 -0400 (EDT)
From: "Doug Bateman (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Updated: (LOGGING-137) LogFactory.getLog()
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     [ https://issues.apache.org/jira/browse/LOGGING-137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doug Bateman updated LOGGING-137:
---------------------------------

    Attachment:     (was: CallStackTest.java)

> LogFactory.getLog()
> -------------------
>
>                 Key: LOGGING-137
>                 URL: https://issues.apache.org/jira/browse/LOGGING-137
>             Project: Commons Logging
>          Issue Type: New Feature
>    Affects Versions: 1.1.2
>            Reporter: Doug Bateman
>         Attachments: CallStackTest.java, CallStackUtil.java, CallStackUtil.patch, LogFactory.java
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> Presently, in Apache Commons, the most common way to get a logger is to do something like:
> public class MyClass {
>     private static Log log = LogFactory.getLog(MyClass.class);
> }
> Notice how MyClass.class (or alternatively a string name) is passed as a parameter.  The annoying aspect of this is that sometimes the class name doesn't get updated when doing copy/paste operations.  A desirable alternative might be:
> public class MyClass {
>     private static Log log = LogFactory.getLog(); //class name inferred from call stack
> }
> With such an approach there are two possible concerns I can foresee:
>     * Call stack inspection isn't terribly fast.  However since Loggers are generally initialized only once, when the class is first loaded, performance isn't likely to be a major problem.
>     * Commons-logging is Java 1.1 compatible.  Thus care must be taken to ensure compatibility isn't broken.
>     * Commons-logging doesn't depend on commons-lang, and thus the utilities in commons-lang cannot be used.
> In Java 1.4, the call stack is easily obtained using Thread.getCallStack().  Prior to Java 1.4, the only way to obtain the call stack is to inspect the stack trace of an exception.

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