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interface Lock
A Lock embodies the lock state of a NodeId. It includes a set of owners and a list of waiters.
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<LockInfo> |
getOwnersClone()
Get a new Set of the owners. |
List<LockInfo> |
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 |
isThin()
|
boolean |
isWaiter(Locker locker)
Return true if locker is a waiter on this Lock. |
LockAttemptResult |
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<Locker> |
release(Locker locker,
MemoryBudget mb,
int lockTableIndex)
Releases a lock and moves the next waiter(s) to the owners. |
void |
stealLock(Locker locker,
MemoryBudget mb,
int lockTableIndex)
Removes all owners except for the given owner, and sets the Preempted property on the removed owners. |
String |
toString()
Debug dumper. |
Lock |
transfer(Long nodeId,
Locker currentLocker,
Locker destLocker,
MemoryBudget mb,
int lockTableIndex)
Transfer a lock from one transaction to another. |
Lock |
transferMultiple(Long nodeId,
Locker currentLocker,
Locker[] destLockers,
MemoryBudget mb,
int lockTableIndex)
Transfer a lock from one transaction to many others. |
Method Detail |
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List<LockInfo> getWaitersListClone()
void flushWaiter(Locker locker, MemoryBudget mb, int lockTableIndex)
Set<LockInfo> getOwnersClone()
boolean isOwner(Locker locker, LockType lockType)
boolean isOwnedWriteLock(Locker locker)
boolean isWaiter(Locker locker)
int nWaiters()
int nOwners()
LockAttemptResult lock(LockType requestType, Locker locker, boolean nonBlockingRequest, MemoryBudget mb, int lockTableIndex) throws DatabaseException
DatabaseException
Set<Locker> release(Locker locker, MemoryBudget mb, int lockTableIndex)
void stealLock(Locker locker, MemoryBudget mb, int lockTableIndex) throws DatabaseException
DatabaseException
void demote(Locker locker)
Lock transfer(Long nodeId, Locker currentLocker, Locker destLocker, MemoryBudget mb, int lockTableIndex) throws DatabaseException
DatabaseException
Lock transferMultiple(Long nodeId, Locker currentLocker, Locker[] destLockers, MemoryBudget mb, int lockTableIndex) throws DatabaseException
DatabaseException
Locker getWriteOwnerLocker()
boolean isThin()
String toString()
toString
in class Object
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