com.hazelcast.internal.locksupport

Class LockStoreImpl

java.lang.Object

com.hazelcast.internal.locksupport.LockStoreImpl

All Implemented Interfaces:

LockStore, DataSerializable, IdentifiedDataSerializable

public final class LockStoreImpl
extends Object
implements IdentifiedDataSerializable, LockStore

Constructor Summary

Constructors

Constructor and Description
LockStoreImpl()
LockStoreImpl(LockSupportService lockService, ObjectNamespace name, EntryTaskScheduler<Data,Integer> entryTaskScheduler, int backupCount, int asyncBackupCount)

Method Summary

Modifier and Type	Method and Description
boolean	canAcquireLock(Data key, UUID caller, long threadId) Return if the key can be locked by the caller and thread ID.
void	clear()
boolean	extendLeaseTime(Data key, UUID caller, long threadId, long leaseTime) Extend the lease time for an already locked key.
boolean	forceUnlock(Data key) Unlock the key regardless of the owner.
int	getAsyncBackupCount()
int	getBackupCount()
int	getClassId() Returns type identifier for this class.
int	getFactoryId() Returns DataSerializableFactory factory ID for this class.
com.hazelcast.internal.locksupport.LockResourceImpl	getLock(Data key)
int	getLockCount(Data key) Return the number of times a key was locked by the same owner (re-entered).
int	getLockedEntryCount() Return the number of locks this store holds.
Set<Data>	getLockedKeys() Return all locked keys for this store.
Collection<LockResource>	getLocks()
ObjectNamespace	getNamespace()
WaitNotifyKey	getNotifiedKey(Data key)
String	getOwnerInfo(Data key) Return a string representation of the owner of the lock for a specific key.
long	getRemainingLeaseTime(Data key) Return the remaining lease time for a specific key.
int	getTotalBackupCount()
int	getVersion(Data key)
boolean	hasLock()
boolean	isLocked(Data key) Check if a key is locked by any caller and thread ID.
boolean	isLockedBy(Data key, UUID caller, long threadId) Check if a key is locked by a specific caller and thread ID.
boolean	localLock(Data key, UUID caller, long threadId, long referenceId, long leaseTime) Lock a specific key on a local partition only.
boolean	lock(Data key, UUID caller, long threadId, long referenceId, long leaseTime) Lock a specific key.
void	readData(ObjectDataInput in) Reads fields from the input stream
void	removeLocalLocks()
boolean	shouldBlockReads(Data key) Return whether the reads for the specific key should be blocked (see LockStore.txnLock(Data, UUID, long, long, long, boolean)).
String	toString()
boolean	txnLock(Data key, UUID caller, long threadId, long referenceId, long leaseTime, boolean blockReads) Lock a specific key for use inside a transaction.
boolean	unlock(Data key, UUID caller, long threadId, long referenceId) Unlock a specific key.
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

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

Constructor Detail

LockStoreImpl

public LockStoreImpl()

LockStoreImpl

public LockStoreImpl(LockSupportService lockService,
                     ObjectNamespace name,
                     EntryTaskScheduler<Data,Integer> entryTaskScheduler,
                     int backupCount,
                     int asyncBackupCount)

Method Detail

lock

public boolean lock(Data key,
                    UUID caller,
                    long threadId,
                    long referenceId,
                    long leaseTime)

Description copied from interface: LockStore

Lock a specific key.

Specified by:

lock in interface LockStore

Parameters:

key - the key to lock

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

referenceId - the identifier for the invocation of the caller (e.g. operation call ID)

leaseTime - the lease duration in milliseconds

Returns:

if the lock was successfully acquired

localLock

public boolean localLock(Data key,
                         UUID caller,
                         long threadId,
                         long referenceId,
                         long leaseTime)

Description copied from interface: LockStore

Lock a specific key on a local partition only. Does not observe LOCK_MAX_LEASE_TIME_SECONDS

Specified by:

localLock in interface LockStore

Parameters:

key - the key to lock

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

referenceId - the identifier for the invocation of the caller (e.g. operation call ID)

leaseTime - the lease duration in milliseconds

Returns:

if the lock was successfully acquired

See Also:

GroupProperty.LOCK_MAX_LEASE_TIME_SECONDS

txnLock

public boolean txnLock(Data key,
                       UUID caller,
                       long threadId,
                       long referenceId,
                       long leaseTime,
                       boolean blockReads)

Description copied from interface: LockStore

Lock a specific key for use inside a transaction.

Specified by:

txnLock in interface LockStore

Parameters:

key - the key to lock

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

referenceId - the identifier for the invocation of the caller (e.g. operation call ID)

leaseTime - the lease duration in milliseconds

blockReads - whether reads for the key should be blocked (e.g. for map and multimap)

Returns:

if the lock was successfully acquired

extendLeaseTime

public boolean extendLeaseTime(Data key,
                               UUID caller,
                               long threadId,
                               long leaseTime)

Description copied from interface: LockStore

Extend the lease time for an already locked key.

Specified by:

extendLeaseTime in interface LockStore

Parameters:

key - the locked key

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

leaseTime - time in milliseconds for the lease to be extended

Returns:

if the lease was extended

getLock

public com.hazelcast.internal.locksupport.LockResourceImpl getLock(Data key)

isLocked

public boolean isLocked(Data key)

Description copied from interface: LockStore

Check if a key is locked by any caller and thread ID.

Specified by:

isLocked in interface LockStore

Parameters:

key - the key

Returns:

if the key is locked

isLockedBy

public boolean isLockedBy(Data key,
                          UUID caller,
                          long threadId)

Description copied from interface: LockStore

Check if a key is locked by a specific caller and thread ID.

Specified by:

isLockedBy in interface LockStore

Parameters:

key - the locked key

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

Returns:

if the key is locked

getLockCount

public int getLockCount(Data key)

Description copied from interface: LockStore

Return the number of times a key was locked by the same owner (re-entered).

Specified by:

getLockCount in interface LockStore

Parameters:

key - the key

Returns:

the reentry count

getLockedEntryCount

public int getLockedEntryCount()

Description copied from interface: LockStore

Return the number of locks this store holds.

Specified by:

getLockedEntryCount in interface LockStore

Returns:

the lock count

getRemainingLeaseTime

public long getRemainingLeaseTime(Data key)

Description copied from interface: LockStore

Return the remaining lease time for a specific key.

Specified by:

getRemainingLeaseTime in interface LockStore

Parameters:

key - the key

Returns:

the lease time in milliseconds, -1 if there is no lock, if the key is locked indefinitely

canAcquireLock

public boolean canAcquireLock(Data key,
                              UUID caller,
                              long threadId)

Description copied from interface: LockStore

Return if the key can be locked by the caller and thread ID.

Specified by:

canAcquireLock in interface LockStore

Parameters:

key - the locked key

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

Returns:

if the key can be locked. Returns false if the key is already locked by a different caller or thread ID

shouldBlockReads

public boolean shouldBlockReads(Data key)

Description copied from interface: LockStore

Return whether the reads for the specific key should be blocked (see LockStore.txnLock(Data, UUID, long, long, long, boolean)).

Specified by:

shouldBlockReads in interface LockStore

Parameters:

key - the lock key

Returns:

if the reads should be blocked

unlock

public boolean unlock(Data key,
                      UUID caller,
                      long threadId,
                      long referenceId)

Description copied from interface: LockStore

Unlock a specific key.

Specified by:

unlock in interface LockStore

Parameters:

key - the locked key

caller - the identifier for the caller

threadId - the identifier for the thread on the caller

referenceId - the identifier for the invocation of the caller (e.g. operation call ID)

Returns:

if the key was unlocked

forceUnlock

public boolean forceUnlock(Data key)

Description copied from interface: LockStore

Unlock the key regardless of the owner. May return true if the key is already unlocked but has waiters/signals/expired operations.

Specified by:

forceUnlock in interface LockStore

Parameters:

key - the lock key

Returns:

false if there is no lock for the given key and true otherwise

getVersion

public int getVersion(Data key)

getLocks

public Collection<LockResource> getLocks()

removeLocalLocks

public void removeLocalLocks()

getLockedKeys

public Set<Data> getLockedKeys()

Description copied from interface: LockStore

Return all locked keys for this store. A lock may be expired when this method returns.

Specified by:

getLockedKeys in interface LockStore

Returns:

all locked keys

hasLock

public boolean hasLock()

clear

public void clear()

getNamespace

public ObjectNamespace getNamespace()

getBackupCount

public int getBackupCount()

getAsyncBackupCount

public int getAsyncBackupCount()

getTotalBackupCount

public int getTotalBackupCount()

getNotifiedKey

public WaitNotifyKey getNotifiedKey(Data key)

getOwnerInfo

public String getOwnerInfo(Data key)

Description copied from interface: LockStore

Return a string representation of the owner of the lock for a specific key. If the key is not locked returns a default string depicting no owner.

Specified by:

getOwnerInfo in interface LockStore

Parameters:

key - the key

Returns:

a string description/representation of the owner

getFactoryId

public int getFactoryId()

Description copied from interface: IdentifiedDataSerializable

Returns DataSerializableFactory factory ID for this class.

Specified by:

getFactoryId in interface IdentifiedDataSerializable

Returns:

factory ID

getClassId

public int getClassId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. It should be unique per DataSerializableFactory.

Specified by:

getClassId in interface IdentifiedDataSerializable

Returns:

type ID

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the input stream has been closed.

toString

public String toString()

Overrides:

toString in class Object