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From "Doug Bateman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LOGGING-137) LogFactory.getLog()
Date Mon, 09 Aug 2010 04:52:40 GMT

     [ https://issues.apache.org/jira/browse/LOGGING-137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

    Attachment: CallStackUtil.java
                LogFactory.java
                CallStackTest.java

Attached is a copy of the Java files.  They duplicate what's in the CallStackUtil.patch. 
They are included strictly for ease of reading.  Feel free to remove these is they aren't
desirable.

> 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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