[brailleblaster] Re: Debugging
- From: "Sina Bahram" <sbahram@xxxxxxxxx>
- To: <brailleblaster@xxxxxxxxxxxxx>
- Date: Mon, 28 Feb 2011 17:45:28 -0500
Log everything, just at different levels.
Take care,
Sina
-----Original Message-----
From: brailleblaster-bounce@xxxxxxxxxxxxx
[mailto:brailleblaster-bounce@xxxxxxxxxxxxx] On Behalf Of John J. Boyer
Sent: Monday, February 28, 2011 8:23 AM
To: brailleblaster@xxxxxxxxxxxxx
Subject: [brailleblaster] Re: Debugging
Sounds good. How do I know what to log? Should the logger be always on?
Where should it put its files?
John
On Mon, Feb 28, 2011 at 12:57:35PM +0000, Michael Whapples wrote:
> Of course its still useful for a GUI application. Think of the support
> request:
> "I do something and it does something unusual"
> You cannot reproduce what they report, what do you do to help them? If
> logging is implemented then a log file can be produced and sent to you.
>
> Logging is great in this respect as internally in the application you
> just use a logger, the configuration tells it what should be done with
> the logging information.
>
> Michael Whapples
> On 28/02/11 12:56, John J. Boyer wrote:
> >I'm wondering how important logging is for an application that is
> >primarily a GUI. Of course it also has command-line functions. Lotting
> >might be nice to use with CLI.
> >
> >John
> >
> >On Mon, Feb 28, 2011 at 07:29:52AM -0500, Sina Bahram wrote:
> >>Log4j is really easy to use though, and is rather wonderful for logging,
> >>if that's what's necessary of course.
> >>
> >>Take care,
> >>Sina
> >>
> >>-----Original Message-----
> >>From: brailleblaster-bounce@xxxxxxxxxxxxx
> >>[mailto:brailleblaster-bounce@xxxxxxxxxxxxx] On Behalf Of Michael Whapples
> >>Sent: Monday, February 28, 2011 5:36 AM
> >>To: brailleblaster@xxxxxxxxxxxxx
> >>Subject: [brailleblaster] Re: Debugging
> >>
> >>Might you really be wanting logging?
> >>
> >>The java logging API in the JDK will probably be sufficient although
> >>there are alternatives like log4j, etc.
> >>
> >>Logging has much finer control over what error messages get output and
> >>where they go (eg. levels like finest, finer, fine, config, info,
> >>warning and severe). I think extra custom levels can be defined although
> >>the documentation seems to advise against that unless really needed.
> >>
> >>Also logging allows you to have multiple loggers which can be set to log
> >>at different levels (eg. the documentation suggests a logger per class).
> >>
> >>Also it is worth noting the following usage:
> >>
> >>if (logger.isLoggable(Level.FINE)) {
> >>logger.log(Level.FINE, "Message to be logged");
> >>}
> >>
> >>While the log method of the Logger class will test if the level allows
> >>logging out, the additional if statement may improve performance as it
> >>saves any preparation to construct the message (eg. concatenation of
> >>strings).
> >>
> >>Configuration of the logging API can be done using system properties or
> >>a properties file.
> >>
> >>Also logging was mentioned before to you. Generally logging is easiest
> >>to implement at the time of writing the code rather than to add it in
> >>later.
> >>
> >>Michael Whapples
> >>On 28/02/11 08:09, John J. Boyer wrote:
> >>>First, in response to Michael's last message, BrailleBlaster will
> >>>present the user with a dialog box asking if she wants to continue,
> >>>change settings read a startup tutorial, see a quick-start guide, etc.
> >>>Finallyt it will have a checkbox with the message "Do not show me this
> >>>message again."
> >>>
> >>>On to debugging. Can I call BrailleBlaster with the command:
> >>>
> >>>java -Ddebug=yes -jar brailleblaster.jar
> >>>
> >>>and later have the code
> >>>
> >>>String debug System.getProperty ("debug")
> >>>
> >>>The immediate reason for this is that I catch the UnsatisfiedLinkError
> >>>exception if the liblouisutdml library is not found and set a boolean
> >>>for the rest of the program. However this error could also be caused if
> >>>one of its dependencies is not found. In this case I want to see the
> >>>message. There will certainly be other reasons for wanting a debug flag.
> >>>
> >>>Thanks,
> >>>John
> >>>
> >>
> >>
>
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
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