com.sleepycat.je.txn

Class DummyLockManager

java.lang.Object

com.sleepycat.je.txn.LockManager

com.sleepycat.je.txn.DummyLockManager

All Implemented Interfaces:

EnvConfigObserver

public class DummyLockManager
extends LockManager

DummyLockManager performs minimal locking and is used when EnvironmentConfig.ENV_IS_LOCKING is false.

Field Summary

Fields inherited from class com.sleepycat.je.txn.LockManager

afterLockHook

Method Summary

Modifier and Type	Method and Description
LockType	getOwnedLockType(Long lsn, Locker locker) Returns the LockType if the given locker owns a lock on the given node, or null if the lock is not owned.
Set<LockInfo>	getOwners(Long lsn) Returns the Lockers that own a lock on the given LSN.
List<LockInfo>	getWaiters(Long lsn) Returns the Lockers that wait on a lock on the given LSN.
Locker	getWriteOwnerLocker(Long lsn)
boolean	isLockUncontended(Long lsn)
boolean	ownsOrSharesLock(Locker locker, Long lsn)
LockAttemptResult	stealLock(Long lsn, Locker locker, LockType lockType)

Methods inherited from class com.sleepycat.je.txn.LockManager

dump, envConfigUpdate, loadStats, lock, release

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getOwners

public Set<LockInfo> getOwners(Long lsn)

Description copied from class: LockManager

Returns the Lockers that own a lock on the given LSN. Note that when this method returns, there is nothing to prevent these lockers from releasing the lock or being closed.

Specified by:

getOwners in class LockManager

getWaiters

public List<LockInfo> getWaiters(Long lsn)

Description copied from class: LockManager

Returns the Lockers that wait on a lock on the given LSN.

Specified by:

getWaiters in class LockManager

getOwnedLockType

public LockType getOwnedLockType(Long lsn,
                                 Locker locker)

Description copied from class: LockManager

Returns the LockType if the given locker owns a lock on the given node, or null if the lock is not owned.

Specified by:

getOwnedLockType in class LockManager

isLockUncontended

public boolean isLockUncontended(Long lsn)

Specified by:

isLockUncontended in class LockManager

ownsOrSharesLock

public boolean ownsOrSharesLock(Locker locker,
                                Long lsn)

Specified by:

ownsOrSharesLock in class LockManager

getWriteOwnerLocker

public Locker getWriteOwnerLocker(Long lsn)
                           throws DatabaseException

Specified by:

getWriteOwnerLocker in class LockManager

Returns:

the transaction that owns the write lock for this

Throws:

DatabaseException

stealLock

public LockAttemptResult stealLock(Long lsn,
                                   Locker locker,
                                   LockType lockType)
                            throws DatabaseException

Specified by:

stealLock in class LockManager

Throws:

DatabaseException