[jboss-jira] [JBoss JIRA] (JBRULES-3274) A BatchCommand triggering a rule which modifies the KBase causes a deadlock

[Mario Fusco (Resolved) (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved JBRULES-3274.
----------------------------------

    Resolution: Done


Fixed implementing an upgradeable ReentrantReadWriteLock (i.e. a lock that allows to upgrade from a read lock to a write one) and synchronizing the KBase on it.
                
> A BatchCommand triggering a rule which modifies the KBase causes a deadlock
> ---------------------------------------------------------------------------
>
>                 Key: JBRULES-3274
>                 URL: https://issues.jboss.org/browse/JBRULES-3274
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>            Reporter: Mario Fusco
>            Assignee: Mario Fusco
>
> Create a BatchCommand containing an insert and a fireAll. Make that inserted fact activate a rule which modifies the KBase, e.g. adding another rule on the fly.
> When executing the batch command, the thread will acquire a read lock. The kBase modification will then require a write lock, causing the deadlock.

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