[infinispan-issues] [JBoss JIRA] Resolved: (ISPN-48) Introduce lock() and unlock() API methods

[Vladimir Blagojevic (JIRA)]

     [ https://jira.jboss.org/jira/browse/ISPN-48?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Blagojevic resolved ISPN-48.
-------------------------------------

    Resolution: Done


> Introduce lock() and unlock() API methods
> -----------------------------------------
>
>                 Key: ISPN-48
>                 URL: https://jira.jboss.org/jira/browse/ISPN-48
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Locking and Concurrency
>            Reporter: Manik Surtani
>            Assignee: Vladimir Blagojevic
>             Fix For: 4.0.0.BETA1, 4.0.0.GA
>
>
> This would be the fabled distributed locking.  
> These APIs should be on AdvancedCache, with the following sigs:
> void lock(K key, boolean eager);
> void lock(Collection<? extends K> keys, boolean eager);
> void unlock(K key);
> void unlock(Collection<? extends K> keys);
> The implementation should use a new Command, a LockControlCommand, which contains:
> * a boolean to indicate whether this is a lock or unlock
> * a boolean to indicate whether this is an eager lock
> * an array of keys to be locked/unlocked
> The command is handled by the LockingInterceptor which will acquire/release locks as needed.
> If eager, the ReplicationInterceptor will replicate this command *synchronously* (even if repl mode is async) to ensure all remote nodes have locked/unlocked as well.  (should this sync force only be on lock() and not unlock()?)  If using DIST, this would only be replicated among peers where the relevant keys are mapped.
> On a transaction prepare, lock()s that are NOT eager should also be respected and applied.  
> On transaction rollback, locks should be unlocked as usual, so unlock() commands need not be a part of the prepare.

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