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java.lang.Objectcom.sleepycat.je.txn.LockImpl
public class LockImpl
A Lock embodies the lock state of a LSN. It includes a set of owners and a list of waiters.
Constructor Summary | |
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LockImpl()
Create a Lock. |
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LockImpl(LockInfo firstOwner)
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Method Summary | |
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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. |
LockType |
getOwnedLockType(Locker locker)
Returns the LockType if the given locker owns this lock, or null if the lock is not owned. |
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()
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boolean |
isWaiter(Locker locker)
Return true if locker is a waiter on this Lock. |
LockAttemptResult |
lock(LockType requestType,
Locker locker,
boolean nonBlockingRequest,
boolean jumpAheadOfWaiters,
MemoryBudget mb,
int lockTableIndex)
Attempts to acquire the lock and returns the LockGrantType. |
int |
nOwners()
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int |
nWaiters()
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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. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public LockImpl()
LockImpl(LockInfo firstOwner)
Method Detail |
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public List<LockInfo> getWaitersListClone()
getWaitersListClone
in interface Lock
public void flushWaiter(Locker locker, MemoryBudget mb, int lockTableIndex)
flushWaiter
in interface Lock
public Set<LockInfo> getOwnersClone()
getOwnersClone
in interface Lock
public boolean isOwner(Locker locker, LockType lockType)
isOwner
in interface Lock
public boolean isOwnedWriteLock(Locker locker)
isOwnedWriteLock
in interface Lock
public LockType getOwnedLockType(Locker locker)
Lock
getOwnedLockType
in interface Lock
public boolean isWaiter(Locker locker)
isWaiter
in interface Lock
public int nWaiters()
nWaiters
in interface Lock
public int nOwners()
nOwners
in interface Lock
public LockAttemptResult lock(LockType requestType, Locker locker, boolean nonBlockingRequest, boolean jumpAheadOfWaiters, MemoryBudget mb, int lockTableIndex)
lock
in interface Lock
public Set<Locker> release(Locker locker, MemoryBudget mb, int lockTableIndex)
release
in interface Lock
public void stealLock(Locker locker, MemoryBudget mb, int lockTableIndex)
Lock
stealLock
in interface Lock
public void demote(Locker locker)
demote
in interface Lock
public Locker getWriteOwnerLocker()
getWriteOwnerLocker
in interface Lock
public boolean isThin()
isThin
in interface Lock
public String toString()
toString
in interface Lock
toString
in class Object
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