Redis并发控制及性能优化
Redis是一种高性能的Key-Value数据库,但是在高并发下会出现数据一致性问题,因此需要进行并发控制和性能优化。本文将讨论如何使用Redis进行并发控制和性能优化。
一、Redis并发控制
// Redis分布式锁
public boolean lock(String lockKey, String uniqueValue, long expireTime) {
Long result =
redisTemplate.execute(
(RedisCallback)
connection -> {
JedisCommands jedisCommands = (JedisCommands) connection.getNativeConnection();
return jedisCommands.setnx(lockKey, uniqueValue);
});
if (result == 1) {
// 设置过期时间
redisTemplate.expire(lockKey, expireTime, TimeUnit.MILLISECONDS);
return true;
} else {
return false;
}
}
public void unlock(String lockKey, String uniqueValue) {
redisTemplate.execute(
(RedisCallback)
connection -> {
JedisCommands jedisCommands = (JedisCommands) connection.getNativeConnection();
if (jedisCommands.get(lockKey) == uniqueValue) {
jedisCommands.del(lockKey);
}
return null;
});
} 二、Redis性能优化
1. 合理设置Redis内存大小
2. 采用Pipeline技术进行批量操作
3. 合理使用Redis的数据结构
// Redis Hash
public void addGoodsToCart(Long userId, Long goodsId) {
String key = "cart:" + userId;
redisTemplate.opsForHash().increment(key, goodsId.toString(), 1);
}
// Redis Set
public void follow(Long userId, Long followUserId) {
String key1 = "user_follow:" + userId;
String key2 = "user_fans:" + followUserId;
redisTemplate.execute(
(RedisCallback)
connection -> {
JedisCommands jedisCommands = (JedisCommands) connection.getNativeConnection();
jedisCommands.sadd(key1, followUserId.toString());
jedisCommands.sadd(key2, userId.toString());
return null;
});
}
// Redis Sorted Set
public void addRanking(String userId, long score) {
redisTemplate
.opsForZSet()
.incrementScore("ranking", userId, score);
} 以上是本文对Redis并发控制及性能优化的讨论。在开发中,需要结合具体业务场景进行调整和优化。