org.redisson

Class RedissonLock

java.lang.Object

org.redisson.RedissonObject

org.redisson.RedissonLock

All Implemented Interfaces:

Lock, RExpirable, RExpirableAsync, RLock, RObject, RObjectAsync

Direct Known Subclasses:

RedissonFairLock, RedissonReadLock, RedissonWriteLock

public class RedissonLock
extends RedissonObject
implements RLock

Distributed implementation of Lock Implements reentrant lock.
Lock will be removed automatically if client disconnects.

Implements a non-fair locking so doesn't guarantees an acquire order.

Author:

Nikita Koksharov

Field Summary

Fields

Modifier and Type	Field and Description
protected long	internalLockLeaseTime
static long	LOCK_EXPIRATION_INTERVAL_SECONDS
protected static LockPubSub	PUBSUB

Fields inherited from class org.redisson.RedissonObject

codec

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RedissonLock(CommandExecutor commandExecutor, String name, UUID id)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	clearExpire() Clear an expire timeout or expire date for object.
RFuture<Boolean>	clearExpireAsync() Clear an expire timeout or expire date for object in async mode.
RFuture<Boolean>	deleteAsync() Delete object in async mode
boolean	expire(long timeToLive, TimeUnit timeUnit) Set a timeout for object.
RFuture<Boolean>	expireAsync(long timeToLive, TimeUnit timeUnit) Set a timeout for object in async mode.
boolean	expireAt(Date timestamp) Set an expire date for object.
boolean	expireAt(long timestamp) Set an expire date for object.
RFuture<Boolean>	expireAtAsync(Date timestamp) Set an expire date for object in async mode.
RFuture<Boolean>	expireAtAsync(long timestamp) Set an expire date for object in async mode.
void	forceUnlock() Unlocks lock independently of state
RFuture<Boolean>	forceUnlockAsync()
protected RedissonLockEntry	getEntry(long threadId)
protected String	getEntryName()
int	getHoldCount() Number of holds on this lock by the current thread
RFuture<Boolean>	isExistsAsync() Check object existence in async mode.
boolean	isHeldByCurrentThread() Checks if this lock is held by the current thread
boolean	isLocked() Checks if this lock locked by any thread
void	lock()
void	lock(long leaseTime, TimeUnit unit) Acquires the lock.
RFuture<Void>	lockAsync()
RFuture<Void>	lockAsync(long leaseTime, TimeUnit unit)
RFuture<Void>	lockAsync(long leaseTime, TimeUnit unit, long currentThreadId)
void	lockInterruptibly()
void	lockInterruptibly(long leaseTime, TimeUnit unit) Acquires the lock.
Condition	newCondition()
long	remainTimeToLive() Remaining time to live of Redisson object that has a timeout
RFuture<Long>	remainTimeToLiveAsync() Get remaining time to live of object in seconds.
protected RFuture<RedissonLockEntry>	subscribe(long threadId)
boolean	tryLock()
boolean	tryLock(long waitTime, long leaseTime, TimeUnit unit) Returns true as soon as the lock is acquired.
boolean	tryLock(long waitTime, TimeUnit unit)
RFuture<Boolean>	tryLockAsync()
RFuture<Boolean>	tryLockAsync(long threadId)
RFuture<Boolean>	tryLockAsync(long waitTime, long leaseTime, TimeUnit unit)
RFuture<Boolean>	tryLockAsync(long waitTime, long leaseTime, TimeUnit unit, long currentThreadId)
RFuture<Boolean>	tryLockAsync(long waitTime, TimeUnit unit)
void	unlock()
RFuture<Void>	unlockAsync()
RFuture<Void>	unlockAsync(long threadId)
protected RFuture<Boolean>	unlockInnerAsync(long threadId)
protected void	unsubscribe(RFuture<RedissonLockEntry> future, long threadId)

Methods inherited from class org.redisson.RedissonObject

await, delete, encode, encodeMapKey, encodeMapValue, get, getCodec, getName, isExists, migrate, migrateAsync, move, moveAsync, newPromise, newSucceededFuture, prefixName, rename, renameAsync, renamenx, renamenxAsync

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.redisson.api.RExpirable

clearExpire, expire, expireAt, expireAt, remainTimeToLive

Methods inherited from interface org.redisson.api.RObject

delete, getCodec, getName, isExists, migrate, move, rename, renamenx

Methods inherited from interface org.redisson.api.RExpirableAsync

clearExpireAsync, expireAsync, expireAtAsync, expireAtAsync, remainTimeToLiveAsync

Methods inherited from interface org.redisson.api.RObjectAsync

migrateAsync, moveAsync, renameAsync, renamenxAsync

Field Detail

LOCK_EXPIRATION_INTERVAL_SECONDS

public static final long LOCK_EXPIRATION_INTERVAL_SECONDS

See Also:

Constant Field Values

internalLockLeaseTime

protected long internalLockLeaseTime

PUBSUB

protected static final LockPubSub PUBSUB

Constructor Detail

RedissonLock

protected RedissonLock(CommandExecutor commandExecutor,
            String name,
            UUID id)

Method Detail

getEntryName

protected String getEntryName()

lock

public void lock()

Specified by:

lock in interface Lock

lock

public void lock(long leaseTime,
        TimeUnit unit)

Description copied from interface: RLock

Acquires the lock.

If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired. If the lock is acquired, it is held until unlock is invoked, or until leaseTime milliseconds have passed since the lock was granted - whichever comes first.

Specified by:

lock in interface RLock

Parameters:

leaseTime - the maximum time to hold the lock after granting it, before automatically releasing it if it hasn't already been released by invoking unlock. If leaseTime is -1, hold the lock until explicitly unlocked.

unit - the time unit of the leaseTime argument

lockInterruptibly

public void lockInterruptibly()
                       throws InterruptedException

Specified by:

lockInterruptibly in interface Lock

Throws:

InterruptedException

lockInterruptibly

public void lockInterruptibly(long leaseTime,
                     TimeUnit unit)
                       throws InterruptedException

Description copied from interface: RLock

Acquires the lock.

If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired. If the lock is acquired, it is held until unlock is invoked, or until leaseTime have passed since the lock was granted - whichever comes first.

Specified by:

lockInterruptibly in interface RLock

Parameters:

leaseTime - the maximum time to hold the lock after granting it, before automatically releasing it if it hasn't already been released by invoking unlock. If leaseTime is -1, hold the lock until explicitly unlocked.

unit - the time unit of the leaseTime argument

Throws:

InterruptedException - - if the thread is interrupted before or during this method.

tryLock

public boolean tryLock()

Specified by:

tryLock in interface Lock

tryLock

public boolean tryLock(long waitTime,
              long leaseTime,
              TimeUnit unit)
                throws InterruptedException

Description copied from interface: RLock

Returns true as soon as the lock is acquired. If the lock is currently held by another thread in this or any other process in the distributed system this method keeps trying to acquire the lock for up to waitTime before giving up and returning false. If the lock is acquired, it is held until unlock is invoked, or until leaseTime have passed since the lock was granted - whichever comes first.

Specified by:

tryLock in interface RLock

Parameters:

waitTime - the maximum time to aquire the lock

leaseTime - lease time

unit - time unit

Returns:

true if lock has been successfully acquired

Throws:

InterruptedException - - if the thread is interrupted before or during this method.

getEntry

protected RedissonLockEntry getEntry(long threadId)

subscribe

protected RFuture<RedissonLockEntry> subscribe(long threadId)

unsubscribe

protected void unsubscribe(RFuture<RedissonLockEntry> future,
               long threadId)

tryLock

public boolean tryLock(long waitTime,
              TimeUnit unit)
                throws InterruptedException

Specified by:

tryLock in interface Lock

Throws:

InterruptedException

unlock

public void unlock()

Specified by:

unlock in interface Lock

newCondition

public Condition newCondition()

Specified by:

newCondition in interface Lock

forceUnlock

public void forceUnlock()

Description copied from interface: RLock

Unlocks lock independently of state

Specified by:

forceUnlock in interface RLock

forceUnlockAsync

public RFuture<Boolean> forceUnlockAsync()

Specified by:

forceUnlockAsync in interface RLock

isLocked

public boolean isLocked()

Description copied from interface: RLock

Checks if this lock locked by any thread

Specified by:

isLocked in interface RLock

Returns:

true if locked otherwise false

isExistsAsync

public RFuture<Boolean> isExistsAsync()

Description copied from interface: RObjectAsync

Check object existence in async mode.

Specified by:

isExistsAsync in interface RObjectAsync

Overrides:

isExistsAsync in class RedissonObject

Returns:

true if object exists and false otherwise

isHeldByCurrentThread

public boolean isHeldByCurrentThread()

Description copied from interface: RLock

Checks if this lock is held by the current thread

Specified by:

isHeldByCurrentThread in interface RLock

Returns:

true if held by current thread otherwise false

getHoldCount

public int getHoldCount()

Description copied from interface: RLock

Number of holds on this lock by the current thread

Specified by:

getHoldCount in interface RLock

Returns:

holds or 0 if this lock is not held by current thread

deleteAsync

public RFuture<Boolean> deleteAsync()

Description copied from interface: RObjectAsync

Delete object in async mode

Specified by:

deleteAsync in interface RObjectAsync

Overrides:

deleteAsync in class RedissonObject

Returns:

true if object was deleted false if not

unlockAsync

public RFuture<Void> unlockAsync()

Specified by:

unlockAsync in interface RLock

unlockInnerAsync

protected RFuture<Boolean> unlockInnerAsync(long threadId)

unlockAsync

public RFuture<Void> unlockAsync(long threadId)

lockAsync

public RFuture<Void> lockAsync()

Specified by:

lockAsync in interface RLock

lockAsync

public RFuture<Void> lockAsync(long leaseTime,
                      TimeUnit unit)

Specified by:

lockAsync in interface RLock

lockAsync

public RFuture<Void> lockAsync(long leaseTime,
                      TimeUnit unit,
                      long currentThreadId)

tryLockAsync

public RFuture<Boolean> tryLockAsync()

Specified by:

tryLockAsync in interface RLock

tryLockAsync

public RFuture<Boolean> tryLockAsync(long threadId)

tryLockAsync

public RFuture<Boolean> tryLockAsync(long waitTime,
                            TimeUnit unit)

Specified by:

tryLockAsync in interface RLock

tryLockAsync

public RFuture<Boolean> tryLockAsync(long waitTime,
                            long leaseTime,
                            TimeUnit unit)

Specified by:

tryLockAsync in interface RLock

tryLockAsync

public RFuture<Boolean> tryLockAsync(long waitTime,
                            long leaseTime,
                            TimeUnit unit,
                            long currentThreadId)

expire

public boolean expire(long timeToLive,
             TimeUnit timeUnit)

Description copied from interface: RExpirable

Set a timeout for object. After the timeout has expired, the key will automatically be deleted.

Specified by:

expire in interface RExpirable

Parameters:

timeToLive - - timeout before object will be deleted

timeUnit - - timeout time unit

Returns:

true if the timeout was set and false if not

expireAsync

public RFuture<Boolean> expireAsync(long timeToLive,
                           TimeUnit timeUnit)

Description copied from interface: RExpirableAsync

Set a timeout for object in async mode. After the timeout has expired, the key will automatically be deleted.

Specified by:

expireAsync in interface RExpirableAsync

Parameters:

timeToLive - - timeout before object will be deleted

timeUnit - - timeout time unit

Returns:

true if the timeout was set and false if not

expireAt

public boolean expireAt(long timestamp)

Description copied from interface: RExpirable

Set an expire date for object. When expire date comes the key will automatically be deleted.

Specified by:

expireAt in interface RExpirable

Parameters:

timestamp - - expire date in milliseconds (Unix timestamp)

Returns:

true if the timeout was set and false if not

expireAtAsync

public RFuture<Boolean> expireAtAsync(long timestamp)

Description copied from interface: RExpirableAsync

Set an expire date for object in async mode. When expire date comes the key will automatically be deleted.

Specified by:

expireAtAsync in interface RExpirableAsync

Parameters:

timestamp - - expire date in seconds (Unix timestamp)

Returns:

true if the timeout was set and false if not

expireAt

public boolean expireAt(Date timestamp)

Description copied from interface: RExpirable

Set an expire date for object. When expire date comes the key will automatically be deleted.

Specified by:

expireAt in interface RExpirable

Parameters:

timestamp - - expire date

Returns:

true if the timeout was set and false if not

expireAtAsync

public RFuture<Boolean> expireAtAsync(Date timestamp)

Description copied from interface: RExpirableAsync

Set an expire date for object in async mode. When expire date comes the key will automatically be deleted.

Specified by:

expireAtAsync in interface RExpirableAsync

Parameters:

timestamp - - expire date

Returns:

true if the timeout was set and false if not

clearExpire

public boolean clearExpire()

Description copied from interface: RExpirable

Clear an expire timeout or expire date for object.

Specified by:

clearExpire in interface RExpirable

Returns:

true if timeout was removed false if object does not exist or does not have an associated timeout

clearExpireAsync

public RFuture<Boolean> clearExpireAsync()

Description copied from interface: RExpirableAsync

Clear an expire timeout or expire date for object in async mode. Object will not be deleted.

Specified by:

clearExpireAsync in interface RExpirableAsync

Returns:

true if the timeout was cleared and false if not

remainTimeToLive

public long remainTimeToLive()

Description copied from interface: RExpirable

Remaining time to live of Redisson object that has a timeout

Specified by:

remainTimeToLive in interface RExpirable

Returns:

time in milliseconds -2 if the key does not exist. -1 if the key exists but has no associated expire.

remainTimeToLiveAsync

public RFuture<Long> remainTimeToLiveAsync()

Description copied from interface: RExpirableAsync

Get remaining time to live of object in seconds.

Specified by:

remainTimeToLiveAsync in interface RExpirableAsync

Returns:

-1 if object does not exist or time in seconds