| java.util.Hashtable
 org.apache.derby.impl.services.locks.SinglePool
| SinglePool | | public class SinglePool extends Hashtable implements LockFactory(Code) | | An implementation of LockFactory that uses a single pool
for the locks, i.e. all lock requests go through a single
point of synchronisation.
The default concrete class "SinglePool.java", prints nothing and thus
incurs no overhead associated with the code to dump lock information. An
alternate concrete class "LockDebug/TracingSinglePool.java", attempts to
output only lock information that "makes sense" to a user - for instance it
doesn't print latch locks.
MT - Mutable - Container Object : Thread Aware
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| Method Summary | |
| public boolean | anyoneBlocked()
| | public Serviceable | apply(String key, Serializable value, Dictionary p)
| | public boolean | areLocksHeld(Object compatabilitySpace, Object group)
Return true if locks are held in this group and this space. | | public boolean | areLocksHeld(Object compatabilitySpace)
| | public void | clearLimit(Object compatabilitySpace, Object group)
Clear a limit set by setLimit. | | public void | init(boolean dbOnly, Dictionary p)
| | public boolean | isLockHeld(Object compatabilitySpace, Object group, Lockable ref, Object qualifier)
| | public boolean | latchObject(Object compatabilitySpace, Lockable ref, Object qualifier, int timeout)
Latch a specific object with a timeout. | | protected Lock | lockAnObject(Object compatabilitySpace, Object group, Lockable ref, Object qualifier, int timeout, Latch heldLatch)
Lock a specific object with a timeout. | | public boolean | lockObject(Object compatabilitySpace, Object group, Lockable ref, Object qualifier, int timeout)
| | public boolean | lockObject(Object group, Lockable ref, Object qualifier, int timeout, Latch latch)
| | public Enumeration | makeVirtualLockTable()
| | public Serializable | map(String key, Serializable value, Dictionary p)
| | public synchronized void | setLimit(Object compatabilitySpace, Object group, int limit, Limit callback)
| | public String | toDebugString()
| | public void | transfer(Object compatabilitySpace, Object oldGroup, Object newGroup)
Transfer a set of locks from one group to another. | | public void | unlatch(Latch heldLatch)
Unlatch an object. | | public int | unlock(Object compatabilitySpace, Object group, Lockable ref, Object qualifier)
| | public void | unlockGroup(Object compatabilitySpace, Object group)
Unlock a group of objects. | | public void | unlockGroup(Object compatabilitySpace, Object group, Matchable key)
| | public boolean | validate(String key, Serializable value, Dictionary p)
| | public boolean | zeroDurationlockObject(Object compatabilitySpace, Lockable ref, Object qualifier, int timeout)
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| deadlockMonitor | | int deadlockMonitor(Code) | | True if all deadlocks errors should be logged.
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| lockTable | | final protected LockSet lockTable(Code) | | The complete set of locks in the system
MT - immutable - content dynamic : LockSet is ThreadSafe
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| SinglePool | | public SinglePool()(Code) | | |
| anyoneBlocked | | public boolean anyoneBlocked()(Code) | | Returns true if locks by anyone are blocking anyone else
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| areLocksHeld | | public boolean areLocksHeld(Object compatabilitySpace, Object group)(Code) | | Return true if locks are held in this group and this space.
MT - thread safe
Parameters:
group - handle of group that objects were locked with.
See Also: LockFactory.areLocksHeld |
| clearLimit | | public void clearLimit(Object compatabilitySpace, Object group)(Code) | | Clear a limit set by setLimit.
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| makeVirtualLockTable | | public Enumeration makeVirtualLockTable()(Code) | | Routines to support lock diagnostics VTIs for the benefit of VirtualLockTable
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| setLimit | | public synchronized void setLimit(Object compatabilitySpace, Object group, int limit, Limit callback)(Code) | | |
| unlockGroup | | public void unlockGroup(Object compatabilitySpace, Object group)(Code) | | Unlock a group of objects.
MT - thread safe
Parameters:
group - handle of group that objects were locked with.If group is null then this call is equivilent to unlockAll().
See Also: LockFactory.unlockGroup |
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