[infinispan-issues] [JBoss JIRA] Created: (ISPN-318) Locking could optionally be "fair"

[Manik Surtani (JIRA)]

Locking could optionally be "fair"
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                 Key: ISPN-318
                 URL: https://jira.jboss.org/jira/browse/ISPN-318
             Project: Infinispan
          Issue Type: Feature Request
          Components: Locking and Concurrency
    Affects Versions: 4.0.0.CR3
            Reporter: Manik Surtani
            Assignee: Manik Surtani
             Fix For: 4.0.0.GA


Would require a number of changes:

1.  A new boolean field and getter/setter in Configuration.LockingType (follow patterns of other boolean flags here to ensure proper XSD and parser generation), perhaps called "useFairLocking", defaults to false.
2.  Modify LockManagerImpl to pass this flag into the LockContainer implementations (in LockManagerImpl#startLockManager())
3.  Modify the 4 concrete LockContainer implementations to use this flag when creating new locks.  Implementations that use JDK reentrant locks just need to pass the fairness flag into the ReentrantLock constructor.
4.  Modify OwnableReentrantLock to handle fairness.  Referring to the JDK's ReentrantLock.FairSync may help.  OwnableReentrantLock combines features of the JDK ReentrantLock and ReentrantLock.NonFairSync into a single class, so perhaps the best approach is to create a new OwnableFairReentrantLock.




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