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}
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                                    <a class="user-hover" rel="noreply.ceki@qos.ch" id="email_noreply.ceki@qos.ch" href="http://jira.qos.ch/secure/ViewProfile.jspa?name=noreply.ceki%40qos.ch" style="color:#326ca6;">Ceki Gulcu</a>
     commented on <img src="http://jira.qos.ch/images/icons/newfeature.gif" height="16" width="16" border="0" align="absmiddle" alt="New Feature"> <a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-719'>LOGBACK-719</a>
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                <a style='color:#326ca6;text-decoration:none;' href='http://jira.qos.ch/browse/LOGBACK-719'><strong>Provide a mechanism to specify an appender factory class</strong></a>
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        <div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;">I suppose this factory must be able to construct objects other than appenders. Indeed, most appenders require sub-components of various types. 
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Currently, on demand object building is done by the instantiateByClassName() method (and variants) located in the ch.qos.logback.core.util OptionHelper class. We could refactor the code so that the on demand object building is performed by an instance of an interface, say OnDemandObjectFactory. Logback would ship with a default implementation of this interface. However, it would be possible to override this implementation by registering a different implementation. 
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<br/>
All logback components get injected a context. So the most obvious registry point for a custom OnDemandObjectFactory  would be a new method in the ch.qos.logback.core.Context interface. </div>
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