org.swisspush.gateleen.core.lock.impl

Class RedisBasedLock

java.lang.Object

org.swisspush.gateleen.core.lock.impl.RedisBasedLock

All Implemented Interfaces:

Lock

public class RedisBasedLock
extends Object
implements Lock

Implementation of the Lock interface based on a redis database.

Author:

https://github.com/mcweba [Marc-Andre Weber]

Field Summary

Fields

Modifier and Type	Field and Description
static String	STORAGE_PREFIX

Constructor Summary

Constructors

Constructor and Description
RedisBasedLock(io.vertx.redis.RedisClient redisClient)

Method Summary

Modifier and Type	Method and Description
io.vertx.core.Future<Boolean>	acquireLock(String lock, String token, long lockExpiryMs) Try to acquire a lock.
io.vertx.core.Future<Boolean>	releaseLock(String lock, String token) Try to release a lock.

Methods inherited from class java.lang.Object

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

Field Detail

STORAGE_PREFIX

public static final String STORAGE_PREFIX

See Also:

Constant Field Values

Constructor Detail

RedisBasedLock

public RedisBasedLock(io.vertx.redis.RedisClient redisClient)

Method Detail

acquireLock

public io.vertx.core.Future<Boolean> acquireLock(String lock,
                                                 String token,
                                                 long lockExpiryMs)

Description copied from interface: Lock

Try to acquire a lock. The token parameter value must be unique across all clients and all lock requests. The lockExpiryMs parameter defines the expiry of the lock. When not manually released, the lock will be released automatically when expired.

Specified by:

acquireLock in interface Lock

Parameters:

lock - The name of the lock to acquire

token - A unique token to define the owner of the lock

lockExpiryMs - The lock expiry in milliseconds

Returns:

Returns a Future holding a Boolean value whether the lock could be successfully acquired or not

releaseLock

public io.vertx.core.Future<Boolean> releaseLock(String lock,
                                                 String token)

Description copied from interface: Lock

Try to release a lock. The token parameter value is used to verify that only the owner of the lock can release it. The token parameter value also prevents the original owner of an already expired lock to release a lock which has been acquired by another client.

Specified by:

releaseLock in interface Lock

Parameters:

lock - The name of the lock to release

token - A unique token to verify if the owner of the lock tries to release the lock

Returns:

Returns a Future holding a Boolean value whether the lock could be sucsessfully released or not