What about event logging? <
https://logging.apache.org/log4j/2.x/manual/eventlogging.html>

This sounds pretty similar to what you're asking about. You define a map
message essentially, plus your other requirements seem to be met here.

On 17 October 2016 at 21:46, Gary Gregory <garydgreg...@gmail.com> wrote:

> On Mon, Oct 17, 2016 at 4:27 PM, Nicholas Duane <nic...@msn.com> wrote:
>
> > Sorry to revive this old thread.  However, we're in the process of adding
> > support for other "categories" of events and thus I wanted to first take
> a
> > step back and try to ensure we're not convoluting things.
> >
> >
> > There was a requirement to log a "compliance" event under certain
> > conditions.  We did not want to write our own logging framework and
> instead
> > decided to use existing off-the-shelf logging frameworks.  We have
> > applications on both Linux/Java, Windows/.NET and Windows/Java.
> Initially
> > we chose log4net for Windows/.NET and log4j2 for Windows/Java and
> > Linux/Java.  For these logging frameworks we wrote artifacts, appenders
> > basically, to help facilitate getting these events to our system.  By the
> > way, our system will get the events centrally, possibly put them into a
> > relational database and also hand them off to another system which will
> get
> > them eventually to an HDFS backend.  We also exposed methods for creating
> > this compliance event.  The compliance event is basically a map.  We
> chose
> > a map so that the event could also be extended by the application team in
> > case they needed to add additional properties which made sense for them.
> >
> >
> > We chose to create a custom level for this "compliance" event such that
> we
> > could filter out only these events and get them into our system.  The
> > configuration example we created had our custom unix domain socket
> appender
> > added to the root logger.  It also contained a filter which filtered out
> > any events that weren't compliance events.  The level we chose for
> > "compliance" was less critical than off and more critical than fatal as
> we
> > wanted to ensure that as long as logging wasn't turned off altogether our
> > events would get logged.
> >
> >
> > I want to go over a few suggestions that were made and explain why I
> > didn't make use of those suggestions.
> >
> >
> > 1. Since our "compliance" level didn't fit within the "vernacular" of the
> > existing levels we should not define this custom level.  Instead we
> should
> > look at using markers.
> >
>
> Yes, this is a use case for markers. The level should be used to note how
> important is each compliance event.
>
>
> >
> > I am not that familiar with markers but did look into them when they were
> > suggested.  While I don't have anything against markers in general there
> > were some downsides as I saw it.
> >
> >
> > a. Markers are not available, as far as I know, in log4net so we'd still
> > have to figure out something there.
> >
>
> Indeed, we really need a port of Log4j 2 to .NET.
>
>
> >
> > b. A bigger problem, at least I thought it was a bigger problem, was that
> > there would be confusion about what level to log the event at.  I would
> > certainly not want to give an example as follows:
> >
> >
> > logger.debug(COMPLIANCE_MARKER, evnt);
> >
> >
> > or
> >
> >
> > logger.info(COMPLIANCE_MARKER, evnt);
> >
> >
> > or
> >
> >
> > logger.error(COMPLIANCE_MARKER, evnt);
> >
> >
> > ...
> >
>
> Think about: How important is this event? Are there different level of
> importance to the audience?
>
>
> >
> >
> > That just screams confusion to me.
> >
> >
> > 2. Use a dedicated logger to log all compliance events.
> >
> >
> > There were, as far as I could tell, a couple problems with this approach
> > also.
> >
> >
> > a. If everyone is using a single "well known" logger to log a specific
> > event category then I lose the logger "context" of who's logging the
> > event.  As it stands now we're copying the logger name into a property we
> > call "eventSource".
> >
>
> A practice is to use one logger per class. Another is to use a higher-level
> logger to represent higher-level abstractions like a module.
>
>
> >
> >
> > b. You cannot turn on/off logging for a specific set of code.  If it
> turns
> > out that we have some errant code which is using this well known logger
> > then we can't just turn off that code from logging as turning off the
> well
> > know logger would turn it off for everyone using it.
> >
> >
> > I did look into the EventLogger and initially that seemed promising as I
> > guess it logs any event you give it at the "all" level.  However, as a
> well
> > known logger it suffers from the same issues above.
> >
> >
> > Now we're looking to add Business events.  My initial thinking is that I
> > can do the same thing we did before.  Add an additional custom level
> called
> > "Business" and expose methods for creating a business event.
>
>
> I would NOT create a custom level. Instead, I would use a Logger called
> "Business".
>
>
> > Though unlike the compliance event, the application teams would be
> > defining the schema more so than our framework team.  Thus any method we
> > expose would just be used as a starting point for setting the common
> > properties.  You would use another instance of our unix domain socket
> > appender for these business events and forward them to a different
> location
> > as business events would most likely have a different retention period
> than
> > compliance events.  Plus you might also want them in a different store as
> > you may never need to query for both categories of events and thus no
> need
> > to query against a larger set of data.
> >
> >
> > In addition we're planning to capture centrally what we refer to as
> > diagnostic events: error, info, warn, debug, trace, etc.  However, we may
> > need to separate these out into two different categories:
> > critical-diagnostic and noncritical-diagnostic.
>
>
> This could be a user case for custom levels IF one is more important than
> the other which it sure sounds like it is.
>
>
>
> > The reason is that we don't want the potential of a critical diagnostic
> > event, let's say an error, queued up behind potentially thousands of
> > non-critical diagnostic events.  So you see, the category also defines
> > aspects on how we handle events at the source.   We separate at the
> source
> > based on category as it seems a reasonable place to do so.  Also, you may
> > want different flush times for different categories.  We have a process
> > which buffers, compresses and sends events centrally so we have the
> notion
> > of flush time.  The buffers are flushed when they become full or the
> flush
> > time elapses.  Errors, since they are more critical in monitoring
> systems,
> > we'll most likely want to flush more often than say debug and trace
> events.
> >
> >
> > Sorry for the long winded explanation.  Initially I was thinking that
> when
> > we create an event we'd set its category.  However, now I'm thinking the
> > category should be set by the act of logging the event at a level.  In
> some
> > cases we have a 1:1 mapping from level to category, eg. compliance level
> ->
> > compliance category.  In some cases we have a many:1 mapping from level
> to
> > category, eg. error, info, warn -> critical-diagnostic.
> >
> >
> > We could also just define a single custom level, say "always_on", or
> > something like that.  Then we provide some helper method to log our "new"
> > event categories (eg. business and compliance) at this level and have the
> > user specify the category, I guess similar to a marker.
> >
>
> Log4j has a level called ALL.
>
> I would really try to work hard to stay within the feature set before
> thinking about anything custom.
>
> If you can make critical-diagnostic and noncritical-diagnostic events to
> stock levels, that much the better.
>
> Gary
>
> >
> >
> > logEvent(Logger logger, String category, object evnt);
> >
> >
> > I guess it's similar to the EventLogger except that we're not using a
> > single well known logger and thus don't have the downsides of that which
> I
> > pointed out earlier.
> >
> >
> > Any thoughts/suggestions would be appreciated.
> >
> >
> > Thanks,
> >
> > Nick
> >
> > ________________________________
> > From: Mikael Ståldal <mikael.stal...@magine.com>
> > Sent: Wednesday, September 9, 2015 3:47 AM
> > To: Log4J Users List
> > Subject: Re: approach for defining loggers
> >
> > Then perhaps you should create your own facade for doing business event
> > logging, which could then forward them to Log4j in an appropriate way.
> >
> > On Wed, Sep 9, 2015 at 4:49 AM, Nicholas Duane <nic...@msn.com> wrote:
> >
> > > I was just about to reply to your previous email about using a single
> > > "business" logger, or some hierarchy of business loggers, to log
> business
> > > events and say that we might go that route.  However, now that you
> > brought
> > > up the post from Ralph, which I just replied to, I'm thinking a logger
> > > won't work either for the same reason I listed in my reply to Ralph's
> > post.
> > >
> > > You could do:
> > >
> > > logger.info("Hello");
> > > logger.fatal("Hello");
> > > logger.error("Hello");
> > > ...
> > >
> > > It's confusing as there are n ways to log a business event that way and
> > > they will all do the same thing.  Which one should a developer choose.
> > > Should I say pick any one, it doesn't matter?
> > >
> > > Thanks,
> > > Nick
> > >
> > > > Date: Tue, 8 Sep 2015 19:28:21 -0700
> > > > Subject: Re: approach for defining loggers
> > > > From: garydgreg...@gmail.com
> > > > To: log4j-user@logging.apache.org
> > > >
> > > > Or
> > > > Logger logger = LogManager.getLogger("Business");
> > > > ...
> > > > logger.info("Hello");
> > > >
> > > > Gary
> > > >
> > > > On Tue, Sep 8, 2015 at 7:24 PM, Ralph Goers <
> > ralph.go...@dslextreme.com>
> > > > wrote:
> > > >
> > > > > Can you please clarify, “If we had some way to know an event is a
> > > business
> > > > > event we wouldn’t need level”?  I do not understand how you can
> code
> > > > > logger.log(BUSINESS, msg)  but you cannot code logger.info
> (BUSINESS,
> > > msg).
> > > > >
> > > > > Ralph
> > > > >
> > > > > > On Sep 8, 2015, at 6:09 PM, Nicholas Duane <nic...@msn.com>
> wrote:
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > I looked over that stackoverflow post and I'm still not seeing a
> > good
> > > > > match as a way for us to log our business events.
> > > > > >
> > > > > > A business event I guess is an event which extends whatever
> schema
> > we
> > > > > come up with for a business event.  While an instance of this
> schema
> > > could
> > > > > be logged at any level, that really doesn't make sense in our
> > scenario,
> > > > > regardless of whether some marker was supplied.  If we had some way
> > to
> > > know
> > > > > an event is a business event we wouldn't need level.  We could of
> > > course
> > > > > add some property to our schema which indicates the 'category' of
> the
> > > > > event, 'business' being one such category.  Instead we were
> thinking
> > we
> > > > > could just use level to indicate that an event is a business event.
> > > > > >
> > > > > > As I mentioned, we're looking to capture 'trace' level events to
> > one
> > > > > store, 'info' - 'fatal' level events to another store, and
> 'business'
> > > > > events to yet another store.  For 'trace' and 'info' - 'fatal' it
> > seems
> > > > > reasonable to filter on level within the appender to get those
> events
> > > to
> > > > > the appropriate location.  It seemed reasonable to do something
> > > similar for
> > > > > 'business'.
> > > > > >
> > > > > > I also looked into the EventLogger but not sure that's
> appropriate.
> > > For
> > > > > one we lose the granularity to control a specific piece of code
> from
> > > > > generating business events.  This is most likely a non-issue as I
> > have
> > > > > mentioned that we don't want to turn business logging off.  The
> other
> > > is
> > > > > that we lose the name of the logger as it would be the same for
> > > everyone.
> > > > > Not sure this is that big a deal either as I guess you might be
> able
> > to
> > > > > capture component name, though I would rather distinguish using
> > logger
> > > name.
> > > > > >
> > > > > > Thanks,
> > > > > > Nick
> > > > > >
> > > > > >> From: ralph.go...@dslextreme.com
> > > > > >> Subject: Re: approach for defining loggers
> > > > > >> Date: Mon, 7 Sep 2015 20:39:11 -0700
> > > > > >> To: log4j-user@logging.apache.org
> > > > > >>
> > > > > >> I still don’t understand why you don’t want to use Markers. They
> > > were
> > > > > designed exactly for the use case you are describing.
> > > > > >>
> > > > > >> You might set retention policies for debug vs info, error and
> > fatal,
> > > > > but a BUSINESS marker could cross-cut them all.  That is exactly
> why
> > > it is
> > > > > NOT a level. IOW, it gives you a second dimension for filtering.
> Ceki
> > > > > invented Markers when he created SLF4J. For his point of view see
> > > > >
> > > http://stackoverflow.com/questions/16813032/what-is-
> > markers-in-java-logging-frameworks-and-that-is-a-reason-to-use-them
> > [http://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-
> > i...@2.png?v=73d79a89bded&a]<http://stackoverflow.com/
> > questions/16813032/what-is-markers-in-java-logging-
> > frameworks-and-that-is-a-reason-to-use-them>
> >
> > What is markers in Java Logging frameworks and that is a ...<
> > http://stackoverflow.com/questions/16813032/what-is-
> > markers-in-java-logging-frameworks-and-that-is-a-reason-to-use-them>
> > stackoverflow.com
> > This is a rehashed version my answer to the question "Best practices for
> > using Markers in SLF4J/Logback". Markers can be used to color or mark a
> > single log statement.
> >
> >
> > > > > <
> > > > >
> > > http://stackoverflow.com/questions/16813032/what-is-
> > markers-in-java-logging-frameworks-and-that-is-a-reason-to-use-them
> > [http://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-
> > i...@2.png?v=73d79a89bded&a]<http://stackoverflow.com/
> > questions/16813032/what-is-markers-in-java-logging-
> > frameworks-and-that-is-a-reason-to-use-them>
> >
> > What is markers in Java Logging frameworks and that is a ...<
> > http://stackoverflow.com/questions/16813032/what-is-
> > markers-in-java-logging-frameworks-and-that-is-a-reason-to-use-them>
> > stackoverflow.com
> > This is a rehashed version my answer to the question "Best practices for
> > using Markers in SLF4J/Logback". Markers can be used to color or mark a
> > single log statement.
> >
> >
> > > > > >.
> > > > > >>
> > > > > >> Ralph
> > > > > >>
> > > > > >>
> > > > > >>
> > > > > >>
> > > > > >>> On Sep 7, 2015, at 5:54 PM, Nicholas Duane <nic...@msn.com>
> > wrote:
> > > > > >>>
> > > > > >>> If I'm attempting to control all the logging from the
> > configuration
> > > > > and I don't know the complete set of loggers in my application as
> > there
> > > > > could be 100's or 1000's, wouldn't it be hard to separate events
> > based
> > > on
> > > > > loggers?  It would seem much easier to separate events based on
> > > level.  In
> > > > > addition, level might be a more reasonable approach for separating.
> > > For
> > > > > example, if I want to send all events to some big-data backend I
> > might
> > > want
> > > > > to separate out traces and debug from info to fatal as traces and
> > > debug are
> > > > > most likely less important from a systems management aspect.  My
> > > retention
> > > > > period for traces and debug might be just a couple days.  The
> > retention
> > > > > period for info to fatal could be 30 days.  Business level might
> be 2
> > > > > years.  Any system management notifications would probably be
> driven
> > > off of
> > > > > info to fatal events and not trace and debug events, which is
> another
> > > > > reason you might want to separate by level.
> > > > > >>>
> > > > > >>> Thanks,
> > > > > >>> Nick
> > > > > >>>
> > > > > >>>> Subject: Re: approach for defining loggers
> > > > > >>>> From: ralph.go...@dslextreme.com
> > > > > >>>> Date: Mon, 31 Aug 2015 08:50:58 -0700
> > > > > >>>> To: log4j-user@logging.apache.org
> > > > > >>>>
> > > > > >>>> A logging “Level” is a level of importance. That is why there
> > is a
> > > > > hierarchy. If you want informational messages then you also would
> > want
> > > > > warnings and errors.
> > > > > >>>>
> > > > > >>>> “BUSINESS” does not convey the same meaning.  Rather, it is
> some
> > > sort
> > > > > of category, which is what Markers are for.
> > > > > >>>>
> > > > > >>>> Using the class name as the logger name is a convention. If
> you
> > > > > really want the class name, method name or line number then you
> > should
> > > be
> > > > > specifying that you want those from the logging event, rather than
> > the
> > > > > logger name.  Unless location information is disabled you always
> have
> > > > > access to that information.
> > > > > >>>>
> > > > > >>>> In short, different loggers are used primarily as a way of
> > > grouping
> > > > > sets of messages - for example all org.hibernate events can be
> routed
> > > to a
> > > > > specific appender or turned off en masse. Levels are used to filter
> > out
> > > > > noise across a set of logging events. Markers are used to
> categorize
> > > > > logging events by arbitrary attributes.
> > > > > >>>>
> > > > > >>>> Ralph
> > > > > >>>>
> > > > > >>>>
> > > > > >>>>> On Aug 31, 2015, at 8:10 AM, Nicholas Duane <nic...@msn.com>
> > > wrote:
> > > > > >>>>>
> > > > > >>>>> Thanks for the feedback.  I will look into Markers and MDC.
> > > > > >>>>>
> > > > > >>>>> With respect to using a separate logger, it would seem I
> would
> > > lose
> > > > > the information about what application code, eg. the class logger,
> is
> > > > > sourcing the event.  We would like to have this information.  On
> top
> > of
> > > > > that, it seems odd, maybe to me only, that for this new level we
> have
> > > our
> > > > > own logger.  It seemed reasonable to me that this new event we want
> > to
> > > > > capture is just a new level.  Just like a DEBUG event is different
> > > from an
> > > > > INFO event.  If I define a BUSINESS level why would that not follow
> > the
> > > > > same design as the current levels?  You wouldn't suggest having
> > > different
> > > > > loggers for TRACE DEBUG INFO WARN ERROR FATAL, would you?  I think
> > one
> > > of
> > > > > the reasons someone on our side is suggesting I have separate
> loggers
> > > is
> > > > > that they think the overhead of filtering at the appender is going
> to
> > > have
> > > > > a noticeable impact.  Our plan, at least the one I have now in my
> > > head, is
> > > > > that we'll have some number of appenders in the root.  We'll then
> > > filter x
> > > > > < INFO events to a tracing appender, INFO <= x <= FATAL to a
> logging
> > > > > appender, and our custom level will go to another appender.
> > Thoughts?
> > > > > >>>>>
> > > > > >>>>> Thanks,
> > > > > >>>>> Nick
> > > > > >>>>>
> > > > > >>>>>> Subject: Re: approach for defining loggers
> > > > > >>>>>> From: ralph.go...@dslextreme.com
> > > > > >>>>>> Date: Sat, 29 Aug 2015 20:59:36 -0700
> > > > > >>>>>> To: log4j-user@logging.apache.org
> > > > > >>>>>>
> > > > > >>>>>>
> > > > > >>>>>>> On Aug 29, 2015, at 7:44 PM, Nicholas Duane <
> nic...@msn.com>
> > > > > wrote:
> > > > > >>>>>>>
> > > > > >>>>>>> I'm curious if there is a prescribed approach to defining
> > > > > loggers.  Let me state what my assumption is.  I assume that
> normally
> > > if
> > > > > some piece of code wants to log events/messages that it should
> > create a
> > > > > logger for itself.  I guess a reasonable name to use is the class
> > name
> > > > > itself.  In terms of logger configuration I would expect that no
> > > loggers
> > > > > are specified in the log4j configuration UNLESS is needs settings
> > other
> > > > > than the default.  The root logger would specify the default
> > settings,
> > > eg.
> > > > > level and appenders.  If some piece of code tied to a logger needs
> to
> > > > > enable tracing in order to debug an issue then you would add that
> > > logger to
> > > > > the configuration and set the level less specific for that logger.
> > Is
> > > this
> > > > > a typical and reasonable approach?
> > > > > >>>>>>
> > > > > >>>>>> What you describe here is the common convention. It is a
> > > reasonable
> > > > > approach.
> > > > > >>>>>>
> > > > > >>>>>>>
> > > > > >>>>>>> I asked because we have the need for a new type of event.
> To
> > > have
> > > > > this event flow to where we want it to flow the plan is to have a
> > > custom
> > > > > level and have all events at that level captured by a specific
> > > appender.
> > > > > My assumption was that for existing applications we'd just need to
> > add
> > > our
> > > > > appender to the root and add our custom level.  The app would need
> to
> > > be
> > > > > modified to log our new event at the custom level.  However,
> someone
> > > > > suggested that we could also create a separate logger for this
> event.
> > > My
> > > > > thinking is that while we don't ever want to turn off logging of
> this
> > > > > event, loggers represent "event sources", e.g the code raising the
> > > events
> > > > > and thus having multiple different pieces of code use the same
> logger
> > > > > wouldn't allow you to turn on/off logging from those different
> > > sections of
> > > > > code independently.  I think the current configuration includes all
> > the
> > > > > loggers.  Normally I would expect there to be many, on the order of
> > > 10's or
> > > > > 100's, loggers within an application.  However, in the case I was
> > given
> > > > > there were only a handful because I think this handful is shared.
> So
> > > as I
> > > > > mentioned, this doesn't sound like an ideal design as you have less
> > > > > granularity on what you can turn on/off.
> > > > > >>>>>>
> > > > > >>>>>> You have a few options. Using a CustomLevel would not be the
> > > option
> > > > > I would choose.  Creating a custom Logger will certainly work and
> > makes
> > > > > routing the message to the appropriate appender rather easy.
> Another
> > > > > approach is to use Markers.  Markers are somewhat hierarchical so
> you
> > > can
> > > > > use them for a variety of purposes.  If you look at how Log4j
> handles
> > > event
> > > > > logging it actually does both - it specifies EventLogger as the
> name
> > > of the
> > > > > logger to use and it uses Markers to identify the kind of event.
> > > > > >>>>>>
> > > > > >>>>>> A third option is to use the MDC or Logger properties. If
> you
> > do
> > > > > that then you can have information included in the actual logging
> > event
> > > > > that can affect how it is routed. I also built a system that uses
> the
> > > > > RFC5424 format so that the event could have lots of key/value pairs
> > to
> > > > > identify the events.
> > > > > >>>>>>
> > > > > >>>>>> Unfortunately, without knowing more details I don’t know
> that
> > I
> > > can
> > > > > give you a better idea on how I would implement it.
> > > > > >>>>>>
> > > > > >>>>>> Ralph
> > > > > >>>>>>
> > > > > >>>>>>
> > > > > ------------------------------------------------------------
> > ---------
> > > > > >>>>>> To unsubscribe, e-mail:
> > > log4j-user-unsubscr...@logging.apache.org
> > > > > >>>>>> For additional commands, e-mail:
> > > log4j-user-h...@logging.apache.org
> > > > > >>>>>>
> > > > > >>>>>
> > > > > >>>>
> > > > > >>>>
> > > > > >>>>
> > > > > >>>>
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> > logging.apache.org
> > > > > >>>> For additional commands, e-mail:
> > > log4j-user-h...@logging.apache.org
> > > > > >>>>
> > > > > >>>
> > > > > >>
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
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