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https://issues.apache.org/jira/browse/LUCENE-3598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler resolved LUCENE-3598.
-----------------------------------
Resolution: Fixed
Assignee: Uwe Schindler
Committed trunk revision: 1209059
For improvements like JUL/SLF4J convenience impl I will open other issues.
> Improve InfoStream class in trunk to be more consistent with
> logging-frameworks like slf4j/log4j/commons-logging
> ----------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3598
> URL: https://issues.apache.org/jira/browse/LUCENE-3598
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Attachments: LUCENE-3598.patch, LUCENE-3598.patch, LUCENE-3598.patch,
> LUCENE-3598.patch
>
>
> Followup on a [thread by Shai Erea on
> java-dev@lao|http://lucene.472066.n3.nabble.com/IndexWriter-infoStream-is-final-td3537485.html]:
> I already discussed with Robert about that, that there is one thing missing.
> Currently the IW only checks if the infoStream!=null and then passes the
> message to the method, and that *may* ignore it. For your requirement it is
> the case that this is enabled or disabled dynamically. Unfortunately if the
> construction of the message is heavy, then this wastes resources.
> I would like to add another method to this class: abstract boolean
> isEnabled() that can also be implemented. I would then replace all null
> checks in IW by this method. The default config in IW would be changed to use
> a NoOutputInfoStream that returns false here and ignores the message.
> A simple logger wrapper for e.g. log4j / slf4j then could look like (ignoring
> component, could be enabled):
> {code:java}
> Loger log = YourLoggingFramework.getLogger(IndexWriter.class);
> public void message(String component, String message) {
> log.debug(component + ": " + message);
> }
> public boolean isEnabled(String component) {
> return log.isDebugEnabled();
> }
> {code}
> Using this you could enable/disable logging live by e.g. the log4j management
> console of your app server by enabling/disabling IndexWriter.class logging.
> The changes are really simple:
> - PrintStreamInfoStream returns true, always, mabye make it dynamically
> enable/disable to allow Shai's request
> - infoStream.getDefault() is never null and can never be set to null. Instead
> the default is a singleton NoOutputInfoStream that returns false of
> isEnabled(component).
> - All null checks on infoStream should be replaced by
> infoStream.isEanbled(component), this is possible as always != null. There
> are no slowdowns by this - it's like Collections.emptyList() instead stupid
> null checks.
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