I already sent this email to user list but figured that would be the incorrect mailing list for this request.
I'm trying to apply log4j in a J2EE environment and I'm hitting a wall with log4j.
I want to use configureAndWatch feature in my application. However, it seems configureAndWatch uses the FileWatchdog class which depends on using a java.io.File instance for the configuration file in order to detect changes to the configuration file.
EJB containers aren't allowed (according to spec) to read/write files or directories in the file system. And if they do, the files you can read/write might not reside where you thought they would. That's my experience with weblogic. So I'm looking for location independence.
So my feature request is (if possible), to have a watchdog that uses resources(as in getResourceAsStream) instead. The way one can detect for changes is to load a Properties instance using the InputStream and do a hashcode check on the Properties. If the hashcode given is different from last check, the file has changed and the property should be reloaded.
Yes, this is much more expensive than checking the modification time of a file. But in a server environment where uptime is critical and the configuration is only pulled let's say every 30 minutes it close to nothing. And it fits in better in the "EJB world" (if there is such a thing).
I searched the archives, but didn't see any previous discussion on this.
Is this possbible or are there issues with this approach. One possible issue I though of is Properties hashcode implementation might depend on the iteration order of the hashtable. If the iteration order is not guaranteed between invocations then you might get a different hashcode for every time. I did some simple testing but didn't find any evidence of this. Nor have a looked at sun's java source to check for this.
Comments?
sincerely, Henrik Bentel
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