[jbossts-issues] [JBoss JIRA] (JBTM-2949) Remove synchronization from ThreadUtil.getThreadId

[Luis Barreiro (JIRA)]

     [ https://issues.jboss.org/browse/JBTM-2949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luis Barreiro updated JBTM-2949:
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    Attachment: specj_349Q.png


> Remove synchronization from ThreadUtil.getThreadId
> --------------------------------------------------
>
>                 Key: JBTM-2949
>                 URL: https://issues.jboss.org/browse/JBTM-2949
>             Project: JBoss Transaction Manager
>          Issue Type: Enhancement
>            Reporter: Luis Barreiro
>         Attachments: specj_349Q.png
>
>
> JBTM-2808 adds synchronization on {{ThreadUtil.getThreadId()}} but that solution does not scale well enough under high contention. 
> There seems to be ways to remove this synchronization:
> # *ConcurrentWeakHashMap* - replace the current {{WeakHashMap}} for a similar data structure that can handle concurrent access. This keeps the same behavior.
> # *Use Thread.getId()* - remove all mappings and generate the {{threadId}} from the {{Thread}}. Although the javadoc mentions that IDs can be reused, the implementation is a counter, like what {{ThreadUtil}} has now. This is the simplest and most elegant fix.
> # *Remove {{threadId}}* - remove the generation of {{threadId}} and use the {{Thread}} throughout the code, generating string IDs when necessary. Probably yields the best performance, but requires the most changes.



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