Package org.springframework.integration.redis.util

Class RedisLockRegistry

java.lang.Object

org.springframework.integration.redis.util.RedisLockRegistry

All Implemented Interfaces:

DisposableBean, ExpirableLockRegistry, LockRegistry

public final class RedisLockRegistry
extends Object
implements ExpirableLockRegistry, DisposableBean

Implementation of ExpirableLockRegistry providing a distributed lock using Redis. Locks are stored under the key registryKey:lockKey. Locks expire after (default 60) seconds. Threads unlocking an expired lock will get an IllegalStateException. This should be considered as a critical error because it is possible the protected resources were compromised.

Locks are reentrant.

However, locks are scoped by the registry; a lock from a different registry with the same key (even if the registry uses the same 'registryKey') are different locks, and the second cannot be acquired by the same thread while the first is locked.

Note: This is not intended for low latency applications. It is intended for resource locking across multiple JVMs.

Conditions are not supported.

Since:

4.0

Author:

Gary Russell, Konstantin Yakimov, Artem Bilan, Vedran Pavic, Unseok Kim, Anton Gabov

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RedisLockRegistry.RedisLockType	The mode in which this registry is going to work with locks.

Constructor Summary

Constructors

Constructor	Description
RedisLockRegistry(RedisConnectionFactory connectionFactory, String registryKey)	Constructs a lock registry with the default (60 second) lock expiration.
RedisLockRegistry(RedisConnectionFactory connectionFactory, String registryKey, long expireAfter)	Constructs a lock registry with the supplied lock expiration.

Method Summary

Modifier and Type	Method	Description
void	destroy()
void	expireUnusedOlderThan(long age)	Remove locks last acquired more than 'age' ago that are not currently locked.
Lock	obtain(Object lockKey)	Obtains the lock associated with the parameter object.
void	setCacheCapacity(int cacheCapacity)	Set the capacity of cached locks.
void	setExecutor(Executor executor)	Set the Executor, where is not provided then a default of cached thread pool Executor will be used.
void	setRedisLockType(RedisLockRegistry.RedisLockType redisLockType)	Set RedisLockRegistry.RedisLockType mode to work in.

Methods inherited from class java.lang.Object

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

Constructor Details

RedisLockRegistry

public RedisLockRegistry(RedisConnectionFactory connectionFactory, String registryKey)

Constructs a lock registry with the default (60 second) lock expiration.

Parameters:

connectionFactory - The connection factory.

registryKey - The key prefix for locks.

RedisLockRegistry

public RedisLockRegistry(RedisConnectionFactory connectionFactory, String registryKey, long expireAfter)

Constructs a lock registry with the supplied lock expiration.

Parameters:

connectionFactory - The connection factory.

registryKey - The key prefix for locks.

expireAfter - The expiration in milliseconds.

Method Details

setExecutor

public void setExecutor(Executor executor)

Set the Executor, where is not provided then a default of cached thread pool Executor will be used.

Parameters:

executor - the executor service

Since:

5.0.5

setCacheCapacity

public void setCacheCapacity(int cacheCapacity)

Set the capacity of cached locks.

Parameters:

cacheCapacity - The capacity of cached lock, (default 100_000).

Since:

5.5.6

setRedisLockType

public void setRedisLockType(RedisLockRegistry.RedisLockType redisLockType)

Set RedisLockRegistry.RedisLockType mode to work in. By default, the RedisLockRegistry.RedisLockType.SPIN_LOCK is used - works in all the environment. The RedisLockRegistry.RedisLockType.PUB_SUB_LOCK is a preferred mode when not in Master/Replica connections - less network chatter. Set the type of unlockType, Select the lock method.

Parameters:

redisLockType - the RedisLockRegistry.RedisLockType to work in.

Since:

5.5.13

obtain

public Lock obtain(Object lockKey)

Description copied from interface: LockRegistry

Obtains the lock associated with the parameter object.

Specified by:

obtain in interface LockRegistry

Parameters:

lockKey - The object with which the lock is associated.

Returns:

The associated lock.

expireUnusedOlderThan

public void expireUnusedOlderThan(long age)

Description copied from interface: ExpirableLockRegistry

Remove locks last acquired more than 'age' ago that are not currently locked.

Specified by:

expireUnusedOlderThan in interface ExpirableLockRegistry

Parameters:

age - the time since the lock was last obtained.

destroy

public void destroy()

Specified by:

destroy in interface DisposableBean