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https://issues.apache.org/jira/browse/LUCENE-1653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713142#action_12713142
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Shai Erera commented on LUCENE-1653:
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round(long, Resolution) is synchronized and this one calls it, so I figured it
cannot hurt to sync it too (sync on an already obtained lock should not have
any overhead, or at least significant one). I can remove the sync if you think
it matters.
> Change DateTools to not create a Calendar in every call to dateToString or
> timeToString
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-1653
> URL: https://issues.apache.org/jira/browse/LUCENE-1653
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Other
> Reporter: Shai Erera
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1653.patch
>
>
> DateTools creates a Calendar instance on every call to dateToString and
> timeToString. Specifically:
> # timeToString calls Calendar.getInstance on every call.
> # dateToString calls timeToString(date.getTime()), which then instantiates a
> new Date(). I think we should change the order of the calls, or not have each
> call the other.
> # round(), which is called from timeToString (after creating a Calendar
> instance) creates another (!) Calendar instance ...
> Seems that if we synchronize the methods and create the Calendar instance
> once (static), it should solve it.
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