[infinispan-issues] [JBoss JIRA] (ISPN-1556) Ability to test and acquire lock if available, without aborting the txn if not available

[Gary Brown (Commented) (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-1556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648349#comment-12648349 ] 

Gary Brown commented on ISPN-1556:
----------------------------------

Hi Galder

The code is: https://github.com/objectiser/savara-sam/blob/ISPN-1556/integration/activity-monitor-server/src/main/java/org/savara/sam/ams/conversations/ConversationManager.java

The init method creates the cache manager - uses the default constructor so does not load any external config file.

The processActivity method has the lock test and also the get method that subsequently fails. I'll try to get the stack trace added soon.

                
> Ability to test and acquire lock if available, without aborting the txn if not available
> ----------------------------------------------------------------------------------------
>
>                 Key: ISPN-1556
>                 URL: https://issues.jboss.org/browse/ISPN-1556
>             Project: Infinispan
>          Issue Type: Feature Request
>    Affects Versions: 5.1.0.BETA2
>         Environment: AS7.1.0.alpha2
>            Reporter: Gary Brown
>            Assignee: Galder Zamarreño
>
> I have a system that performs a large number of tasks in a single transaction for efficiency. Some of those tasks access infinispan caches.
> I found that occasionally I have been getting lock timeouts for the default 15 second period.
> Lock contention is not a problem - but the impact of failing to obtain the lock results in the whole transaction being aborted, which aborts the work also carried out for potentially a large number of other tasks, resulting in all of the work being retried.
> I was wondering if it would be possible to provide an alternative lock implementation the AdvancedCache that allowed a client app to test whether the lock was available and acquire it - returning 'true', but if the lock was not available, simply returning false, allowing the client code to make a decision about how to proceed.
> In my case, I could then add the specific task to a retry queue, and move onto the next task, committing all of the work that had been successfully completed for the other tasks.

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