commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LANG-609) Support lazy initialization using atomic variables
Date Sat, 09 Oct 2010 15:31:32 GMT

     [ https://issues.apache.org/jira/browse/LANG-609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Oliver Heger closed LANG-609.
-----------------------------

    Resolution: Fixed

A new AtomicSafeInitializer class was comitted in revision 1006174.

> Support lazy initialization using atomic variables
> --------------------------------------------------
>
>                 Key: LANG-609
>                 URL: https://issues.apache.org/jira/browse/LANG-609
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.concurrent.*
>            Reporter: Oliver Heger
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: AtomicInitializer.patch
>
>
> In the new concurrent package there is already the {{LazyInitializer}} class implementing
the double-check idiom for lazy initialization of instance fields. Another way to perform
initialization lazily would be the usage of atomic variables. This solution would not need
synchronization at all. If there is low contention (not many threads in parallel), it is more
efficient than synchronized access. Its drawback is that the initialization may be done multiple
times if multiple threads access the initializer almost at the same time (however, it can
be guaranteed that always the same object created by the initializer is returned).
> This is a proposal to add an {{AtomicInitializer}} class as an alternative to {{LazyInitializer}}
that operates on {{AtomicReference}} variables.
> In order to make the initializers smoothly exchangable, it would make sense for them
to share a common interface. This interface could also be implemented by the {{BackgroundInitializer}}
class.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message