| java.lang.Object
 com.sleepycat.je.txn.Lock
| Lock | | public class Lock (Code) | | A Lock embodies the lock state of a NodeId. It includes a set of owners and
a list of waiters.
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| Constructor Summary | |
| public | Lock()
Create a Lock. |
| Method Summary | |
| void | demote(Locker locker)
Downgrade a write lock to a read lock. | | void | flushWaiter(Locker locker, MemoryBudget mb, int lockTableIndex)
Remove this locker from the waiter list. | | Set | getOwnersClone()
Get a new Set of the owners. | | List | getWaitersListClone()
Get a list of waiters for debugging and error messages. | | Locker | getWriteOwnerLocker()
Return the locker that has a write ownership on this lock. | | boolean | isOwnedWriteLock(Locker locker)
Return true if locker is an owner of this Lock and this is a write
lock. | | boolean | isOwner(Locker locker, LockType lockType)
Return true if locker is an owner of this Lock for lockType,
false otherwise. | | boolean | isWaiter(Locker locker)
Return true if locker is a waiter on this Lock. | | LockGrantType | lock(LockType requestType, Locker locker, boolean nonBlockingRequest, MemoryBudget mb, int lockTableIndex)
Attempts to acquire the lock and returns the LockGrantType. | | int | nOwners()
| | int | nWaiters()
| | Set | release(Locker locker, MemoryBudget mb, int lockTableIndex)
Releases a lock and moves the next waiter(s) to the owners. | | public String | toString()
Debug dumper. | | LockType | transfer(Long nodeId, Locker currentLocker, Locker destLocker, MemoryBudget mb, int lockTableIndex)
Transfer a lock from one transaction to another. | | LockType | transferMultiple(Long nodeId, Locker currentLocker, Locker[] destLockers, MemoryBudget mb, int lockTableIndex)
Transfer a lock from one transaction to many others. |
| Lock | | public Lock()(Code) | | Create a Lock. public for Sizeof
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| demote | | void demote(Locker locker)(Code) | | Downgrade a write lock to a read lock.
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| flushWaiter | | void flushWaiter(Locker locker, MemoryBudget mb, int lockTableIndex)(Code) | | Remove this locker from the waiter list.
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| getOwnersClone | | Set getOwnersClone()(Code) | | Get a new Set of the owners.
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| getWaitersListClone | | List getWaitersListClone()(Code) | | Get a list of waiters for debugging and error messages.
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| getWriteOwnerLocker | | Locker getWriteOwnerLocker()(Code) | | Return the locker that has a write ownership on this lock. If no
write owner exists, return null.
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| isOwnedWriteLock | | boolean isOwnedWriteLock(Locker locker)(Code) | | Return true if locker is an owner of this Lock and this is a write
lock.
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| isOwner | | boolean isOwner(Locker locker, LockType lockType)(Code) | | Return true if locker is an owner of this Lock for lockType,
false otherwise.
This method is only used by unit tests.
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| isWaiter | | boolean isWaiter(Locker locker)(Code) | | Return true if locker is a waiter on this Lock.
This method is only used by unit tests.
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| lock | | LockGrantType lock(LockType requestType, Locker locker, boolean nonBlockingRequest, MemoryBudget mb, int lockTableIndex)(Code) | | Attempts to acquire the lock and returns the LockGrantType.
Assumes we hold the lockTableLatch when entering this method.
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| release | | Set release(Locker locker, MemoryBudget mb, int lockTableIndex)(Code) | | Releases a lock and moves the next waiter(s) to the owners.
null if we were not the owner,a non-empty set if owners should be notified after releasing,an empty set if no notification is required. |
| transferMultiple | | LockType transferMultiple(Long nodeId, Locker currentLocker, Locker[] destLockers, MemoryBudget mb, int lockTableIndex) throws DatabaseException(Code) | | Transfer a lock from one transaction to many others. Only really needed
for case where a write handle lock is being transferred to multiple read
handles.
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