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

[Luis Barreiro (JIRA)]

Luis Barreiro created JBTM-2949:
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             Summary: 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


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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