Redis分布式锁加时效和不加时效两种方案的最全代码实现
2023-09-14 09:02:04 时间
锁住3秒:
@Autowired
private RedisTemplate redisTemplate;
String withdrawals_apply_key = WITHDRAWALS_REDIS_KEY+driver.getId();
boolean flag = redisTemplate.opsForValue().setIfAbsent(withdrawals_apply_key,WITHDRAWALS_LOCK);
log.info("任务是否获取到锁:" + flag);
if (flag) {
redisTemplate.expire(withdrawals_apply_key,3,TimeUnit.SECONDS);
//要锁住的代码
。。。。。。
}else{
log.info("任务没有获取到锁,不执行!");
return;
}
锁不设置时效:
@Autowired
private RedisTemplate redisTemplate;
boolean flag = false;
try{
flag = redisTemplate.opsForValue().setIfAbsent(REDIS_KEY, LOCK);
log.info("是否获取到锁:" + flag);
if (flag){
//要锁住的代码
。。。。。。
}else {
log.info("没有获取到锁,不执行定时任务!");
return;
}
}finally {
if (flag) {
redisTemplate.delete(REDIS_KEY);
log.info("任务结束,释放锁!");
} else {
log.info("没有获取到锁,无需释放锁!");
}
}
redis的配置类(springboot):
import com.fengyuncx.common.utils.json.FastJsonRedisSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCacheWriter;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisPassword;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.jedis.JedisClientConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.*;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import redis.clients.jedis.JedisPoolConfig;
import java.time.Duration;
@Configuration
@EnableCaching
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig {
@Value("${spring.driverRedis.host}")
private String host;
@Value("${spring.driverRedis.port}")
private int port;
@Value("${spring.driverRedis.password}")
private String password;
@Value("${spring.driverRedis.maxTotal}")
private Integer maxTotal;
@Value("${spring.driverRedis.maxIdle}")
private Integer maxIdle;
@Value("${spring.driverRedis.maxWaitMillis}")
private Integer maxWaitMillis;
@Value("${spring.driverRedis.timeout}")
private int timeout;
@Value("${spring.driverRedis.database}")
private int database;
@Primary
@Bean
public RedisConnectionFactory cacheBusinessRedisConnectionFactory() {
JedisPoolConfig poolConfig = new JedisPoolConfig();
poolConfig.setMaxTotal(maxTotal);
poolConfig.setMaxIdle(maxIdle);
poolConfig.setMaxWaitMillis(maxWaitMillis);
poolConfig.setTestOnBorrow(true);
poolConfig.setTestOnReturn(false);
poolConfig.setTestWhileIdle(true);
JedisClientConfiguration clientConfig = JedisClientConfiguration.builder()
.usePooling().poolConfig(poolConfig).and().readTimeout(Duration.ofMillis(timeout)).build();
// 单点redis
RedisStandaloneConfiguration redisConfig = new RedisStandaloneConfiguration();
// 哨兵redis
// RedisSentinelConfiguration redisConfig = new RedisSentinelConfiguration();
// 集群redis
// RedisClusterConfiguration redisConfig = new RedisClusterConfiguration();
redisConfig.setHostName(host);
redisConfig.setPassword(RedisPassword.of(password));
redisConfig.setPort(port);
redisConfig.setDatabase(database);
return new JedisConnectionFactory(redisConfig, clientConfig);
}
/**
* 管理缓存 springboot2
*
* @param redisTemplate
* @return
*/
@Bean
public RedisCacheManager redisCacheManager(RedisTemplate redisTemplate) {
//初始化一个RedisCacheWriter
RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisTemplate.getConnectionFactory());
RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(redisTemplate.getValueSerializer()));//设置序列化
//设置默认超过期时间是30秒
redisCacheConfiguration.entryTtl(Duration.ofSeconds(30));
//初始化RedisCacheManager
RedisCacheManager cacheManager = new RedisCacheManager(redisCacheWriter, redisCacheConfiguration);
return cacheManager;
}
@Bean
public RedisTemplate<String, Object> redisTemplate() {
RedisTemplate<String, Object> template = new RedisTemplate<>();
// Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
// template.setValueSerializer(jackson2JsonRedisSerializer);
// template.setHashValueSerializer(jackson2JsonRedisSerializer);
//使用fastjson序列化
FastJsonRedisSerializer fastJsonRedisSerializer = new FastJsonRedisSerializer(Object.class);
// value值的序列化采用fastJsonRedisSerializer
template.setValueSerializer(fastJsonRedisSerializer);
template.setHashValueSerializer(fastJsonRedisSerializer);
// key的序列化采用StringRedisSerializer
template.setKeySerializer(new StringRedisSerializer());
template.setHashKeySerializer(new StringRedisSerializer());
//
template.setConnectionFactory(cacheBusinessRedisConnectionFactory());
return template;
}
/**
* 对hash类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public HashOperations<String, String, Object> hashOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForHash();
}
/**
* 对redis字符串类型数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public ValueOperations<String, Object> valueOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForValue();
}
/**
* 对链表类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public ListOperations<String, Object> listOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForList();
}
/**
* 对无序集合类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public SetOperations<String, Object> setOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForSet();
}
/**
* 对有序集合类型的数据操作
*
* @param redisTemplate
* @return
*/
@Bean
public ZSetOperations<String, Object> zSetOperations(RedisTemplate<String, Object> redisTemplate) {
return redisTemplate.opsForZSet();
}
}
application.yml配置内容:
spring:
driverRedis:
host: 192.168.101.100
port: 6379
password: 123456
maxIdle: 300
maxTotal: 600
maxWaitMillis: 1000
timeout: 3000
database: 4
dictRedis:
host: 192.168.101.100
port: 6379
password: 123456
maxIdle: 300
maxTotal: 600
maxWaitMillis: 1000
timeout: 3000
database: 0
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