LockManager (JBossCache API) - JBoss 4.0.1 sp1 Cache API Documentation 英文版文档

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org.jboss.cache.lock
Interface LockManager

All Known Implementing Classes:: LockManagerImpl

public interface LockManager

Interface for acquising and releasing locks on nodes of the cache. An implementation knows the cache and how to acquire locks on nodes.

Version:: $Revision: 1.2 $
Author:: Bela Ban Apr 9, 2003

Method Summary

boolean getDirtyReadsAllowed()
          Can we read values changed in another (uncommitted) transaction ? If true we can have read-locks; otherwise only write-locks will be acquired

void getReadLock(TreeCache cache, String fqn, long timeout)
          Acquires a read lock.

void getWriteLock(TreeCache cache, String fqn, long timeout)
          Acquires a write-lock.

void releaseLock(String fqn, boolean release_children)


void setDirtyReadsAllowed(boolean flag)

Method Detail

getDirtyReadsAllowed

public boolean getDirtyReadsAllowed()

Can we read values changed in another (uncommitted) transaction ? If true we can have read-locks; otherwise only write-locks will be acquired

setDirtyReadsAllowed

public void setDirtyReadsAllowed(boolean flag)

getReadLock

public void getReadLock(TreeCache cache,
                        String fqn,
                        long timeout)
                 throws TimeoutException

Acquires a read lock. If the lock cannot be acquired within the timeout, a TimeoutExeption will be thrown. If the current thread already owns the read-lock, or owns the write-lock, this will succeed.

Parameters:: cache -; fqn -; timeout -
Throws:: TimeoutException

getWriteLock

public void getWriteLock(TreeCache cache,
                         String fqn,
                         long timeout)
                  throws TimeoutException,
                         UpgradeException

Acquires a write-lock. If the lock cannot be acquired within the timeout, a TimeoutExeption will be thrown. If the current thread already owns the write-lock, this will succeed. If the current thread own the read-lock, it will try to upgrade the read-lock to write-lock status. If this fails, an UpgradeException will be thrown.

Parameters:: cache -; fqn -; timeout -
Throws:: TimeoutException; UpgradeException

releaseLock

public void releaseLock(String fqn,
                        boolean release_children)