Could AsyncAppender be adapted for this use case? On Mon, Sep 26, 2016 at 12:44 AM, Remko Popma <remko.po...@gmail.com> wrote:
> That sounds like quite a unique use case! > > Would it make sense to go through a few iterations at your company until > you have something that you're really happy with (to use and to support) > before publishing it in Log4j? > > Remko > > Sent from my iPhone > > On 2016/09/25, at 7:13, Gary Gregory <garydgreg...@gmail.com> wrote: > > Hi All, > > I can't believe it, but through a convoluted use-case, I actually need an > in-memory list appender, very much like our test-only ListAppender. > > The requirement is as follows. > > We have a JDBC driver and matching proprietary database that specializes > in data virtualization of mainframe resources like DB2, VSAM, IMS, and all > sorts of non-SQL data sources (http://www.rocketsoftware. > com/products/rocket-data/rocket-data-virtualization) > > The high level requirement is to merge the driver log into the server's > log for full-end to end tractability and debugging. > > When the driver is running on the z/OS mainframe, it can be configured > with a z/OS specific Appender that can talk to the server log module > directly. > > When the driver is running elsewhere, it can talk to the database via a > Syslog socket Appender. This requires more set up on the server side and > for the server to do special magic to know how the incoming log events > match up with server operations. Tricky. > > The customer should also be able to configure the driver such that anytime > the driver communicates to the database, it sends along whatever log events > have accumulated since the last client-server roundtrip. This allows the > server to match exactly the connection and operations the client performed > with the server's own logging. > > In order to do that I need to buffer all log events in an Appender and > when it's time, I need to get the list of events and reset the appender to > a new empty list so events can keep accumulating. > > My proposal is to either turn our ListAppender into such an appender. For > sanity, the appender could be configured with various sizing policies: > > - open: the list grows unbounded > - closed: the list grows to a given size and _new_ events are dropped on > the floor beyond that > - latest: the list grows to a given size and _old_ events are dropped on > the floor beyond that > > Thoughts? > > Gary > > -- > E-Mail: garydgreg...@gmail.com | ggreg...@apache.org > Java Persistence with Hibernate, Second Edition > <http://www.manning.com/bauer3/> > JUnit in Action, Second Edition <http://www.manning.com/tahchiev/> > Spring Batch in Action <http://www.manning.com/templier/> > Blog: http://garygregory.wordpress.com > Home: http://garygregory.com/ > Tweet! http://twitter.com/GaryGregory > > -- [image: MagineTV] *Mikael Ståldal* Senior software developer *Magine TV* mikael.stal...@magine.com Grev Turegatan 3 | 114 46 Stockholm, Sweden | www.magine.com Privileged and/or Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such a person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email.
