Redis lock uses the Redis database to implement a mutex lock: set the key atomically through the SETNX command, and do not operate if the key exists. Use the EXPIRE command to set the key expiration time. Delete the key after acquiring the lock to release the lock.
Redis lock is a mechanism that uses the Redis database in a distributed system to implement a mutual exclusion lock. The core principle is:
Based on these two commands, the steps to implement the Redis lock are as follows:
SETNX
command to try Set a key. If the setting is successful, it means acquiring the lock. EXPIRE
command to set an expiration time for the lock key to ensure that the lock will not be held permanently. Specific implementation code (pseudocode):
<code>def acquire_lock(key, value, expire_time): if redis.setnx(key, value): redis.expire(key, expire_time) return True else: return False def release_lock(key): redis.delete(key)</code>
Advantages:
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