[jira] Closed: (LANG-494) CharSet sub-classes cannot be made thread-safe

["Henri Yandell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Henri Yandell closed LANG-494.
------------------------------

    Resolution: Fixed

svn ci -m "Synchronizing the COMMON Map so that getInstance doesn't miss a put from a subclass in another thread. LANG-494"
Sending        src/main/java/org/apache/commons/lang3/CharSet.java
Transmitting file data .
Committed revision 897408.


> CharSet sub-classes cannot be made thread-safe
> ----------------------------------------------
>
>                 Key: LANG-494
>                 URL: https://issues.apache.org/jira/browse/LANG-494
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.*
>            Reporter: Sebb
>             Fix For: 3.0
>
>
> AFAICT, CharSet sub-classes cannot be made thread-safe.
> This is because the HashMap and HashSet collections are not thread-safe.
> If a sub-class updates COMMON, there is no guarantee that getInstance() will see the update.
> In the case of the instance variable "set", the sub-class could override all the read/write methods to provide thread-safety.

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