I think you have it backwards. Its when someone calls the driver's JDBC's setLogWriter() that this method would then reconfigure log4j with a new appender. Or again, I 'm not explaining myself clearly. Sorry.
I created https://issues.apache.org/jira/browse/LOG4J2-1178 Any and all help is appreciated to flush this out. Thank you, Gary On Sat, Oct 24, 2015 at 8:25 PM, Matt Sicker <[email protected]> wrote: > Is there a JIRA issue for this? This could be pretty easily done as an > appender like you said, and just use its start() method to setLogWriter. > > On 19 June 2015 at 19:16, Gary Gregory <[email protected]> wrote: > >> I'm not saying what I want to do clearly enough, let's see... >> >> I am writing a JDBC driver. The JDBC Spec has a >> DataSource.setLogWriter(PrintStream) API drivers should implement. >> >> Users can drop our driver into any tool that talks JDBC or write their >> own apps. In am concerned about the 'drop the driver anywhere' scenario, >> like in an Eclipse based tool; that may or may not use Eclipse DTP. Or >> anything else. >> >> The setLogWriter API can be called at any time, after Log4j has >> initialized itself for example. >> >> I do all my driver logging through Log4j. If a tool calls setLogWriter, >> I'd like the given PrintStream to become an Appender such that Log4j output >> appears there. >> >> The only way I see to do that is through pseudo-code like >> "getLoggerContext().getConfiguration().addAppender(PrintStreamAppender.createPrintStreamAppender(aPrintStream))" >> >> Gary >> >> On Fri, Jun 19, 2015 at 7:48 AM, Ralph Goers <[email protected]> >> wrote: >> >>> Sorry, I misunderstood the question. >>> >>> I’d look for a way to call the setLogWriter API during log4j >>> configuration. >>> >>> Ralph >>> >>> On Jun 18, 2015, at 6:35 PM, Gary Gregory <[email protected]> >>> wrote: >>> >>> I do not understand "Just have the initial writer be a noop." >>> >>> Gary >>> >>> On Thu, Jun 18, 2015 at 5:40 PM, Ralph Goers <[email protected] >>> > wrote: >>> >>>> Why reconfigure? Just have the initial writer be a noop. >>>> >>>> Sent from my iPhone >>>> >>>> On Jun 18, 2015, at 3:49 PM, Gary Gregory <[email protected]> >>>> wrote: >>>> >>>> Hi All: >>>> >>>> I have a use case where I use Log4j 2 for logging within a JDBC driver. >>>> I'd like to support the DataSource#setLogWriter(PrintStream) API in a >>>> fairly simple way. Granting that Log4j must be configured, if the user >>>> calls setLogWriter, I'd like to add a "print writer appender" to Log4j such >>>> that the user's PrintWriter becomes an appender target for log events. >>>> >>>> Any thoughts on getting this to work considering that the setLogWriter >>>> API can be called at any time in an apps life cycle. If I can get a clean >>>> impl, I'd like to put it in the iostreams module. >>>> >>>> Does this require a full reconfigure of log4j or is there a way to >>>> "just add an appender" programatically? >>>> >>>> Gary >>>> >>>> -- >>>> E-Mail: [email protected] | [email protected] >>>> 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 >>>> >>>> >>> >>> >>> -- >>> E-Mail: [email protected] | [email protected] >>> 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 >>> >>> >>> >> >> >> -- >> E-Mail: [email protected] | [email protected] >> 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 >> > > > > -- > Matt Sicker <[email protected]> > -- E-Mail: [email protected] | [email protected] 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
