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From "Dmitry Katsubo (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LANG-909) Thread-safe wrapper for SimpleDateFormat
Date Wed, 07 Aug 2013 18:08:49 GMT

     [ https://issues.apache.org/jira/browse/LANG-909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitry Katsubo updated LANG-909:
--------------------------------

    Attachment: DateFormatAdapter.java
                ThreadSafeSimpleDateFormatTest.java
                ThreadSafeSimpleDateFormat.java

Attaching improved version (formatting applied, testing improved, added delegating setters/getters).

I also attach the adapter for current {{FastDateFormat}} and {{FastDateParser}} and testing
these implementations via adapter (which I have referred in my last comment).

{{FastDateParser}} in general services my needs, as I only work with Gregorian calendar. For
other calendars JavaDoc says it delegates parsing to {{SimpleDateFormat}} (I have not found
this place in code), thus for these calendars {{ThreadSafeSimpleDateFormat}} is (potentially)
faster as it shares same {{SimpleDateFormat}} instance within a thread.

Does anyone has measurements on how {{FastDateParser}} is faster then {{SimpleDateFormat}}?
                
> Thread-safe wrapper for SimpleDateFormat
> ----------------------------------------
>
>                 Key: LANG-909
>                 URL: https://issues.apache.org/jira/browse/LANG-909
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.time.*
>    Affects Versions: 3.1
>            Reporter: Dmitry Katsubo
>            Priority: Minor
>         Attachments: DateFormatAdapter.java, ThreadSafeSimpleDateFormat.java, ThreadSafeSimpleDateFormatTest.java
>
>
> {{SimpleDateFormat}} implementation in JDK is known to be [not thread-safe|http://stackoverflow.com/questions/6840803/simpledateformat-thread-safety].
The attached helper class solves the problem by holding a separate instance of {{SimpleDateFormat}}
per thread.

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