redis分布式锁的实现示例
小编给大家分享一下redis分布式锁的实现示例，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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Redisson
redisson和下列一下自行封装两种方式的区别（场景）：
redisson未获取到锁的会进入等待，直到获取到锁。
另外两种方式如果未获取到锁，会放弃，不会执行业务代码。
org.redisson redisson-spring-boot-starter 3.13.6
@Autowiredprivate Redisson redisson;@GetMapping("/redissonLock")public String redissonLock() {
log.info("进入了方法");
RLock lock = redisson.getLock("redissonLock");
try {
lock.lock(30, TimeUnit.SECONDS);
Thread.sleep(10000);
System.out.println("我是你大哥");
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
// 如果不释放，不会唤起其他线程，则其他线程会超时过期自动唤醒，不会执行业务代码
lock.unlock();
}
return "运行结束";}RedisTemplate封装redis锁（1）
org.springframework.boot spring-boot-starter-data-redis
package com.util;import org.springframework.dao.DataAccessException;import org.springframework.data.redis.connection.RedisConnection;import org.springframework.data.redis.connection.RedisStringCommands;import org.springframework.data.redis.core.RedisCallback;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.script.RedisScript;import org.springframework.data.redis.core.types.Expiration;import org.springframework.stereotype.Component;import java.util.Arrays;@Componentpublic class RedisLock {
private static RedisTemplate redisTemplate;
private static String script = "if redis.call(\"get\",KEYS[1]) == ARGV[1] then\n" +
"\treturn redis.call(\"del\",KEYS[1])\n" +
"else\n" +
" \treturn 0\t\n" +
"end ";
public RedisLock(RedisTemplate redisTemplate) {
RedisLock.redisTemplate = redisTemplate;
}
public static Boolean getLock(String key, String value, Long expireTime) {
RedisStringCommands.SetOption setOption = RedisStringCommands.SetOption.ifAbsent();
Expiration expiration = Expiration.seconds(expireTime);
RedisCallback booleanRedisCallback = new RedisCallback() {
@Override
public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
return connection.set(redisTemplate.getKeySerializer().serialize(key), redisTemplate.getValueSerializer().serialize(value), expiration, setOption);
}
};
return (Boolean) redisTemplate.execute(booleanRedisCallback);
}
public static Boolean unLock(String key, String value) {
RedisScript redisScript = RedisScript.of(script, Boolean.class);
return (Boolean) redisTemplate.execute(redisScript, Arrays.asList(key), value);
}} @GetMapping("/redisLock")public String redisLock() {
log.info("进入了方法");
String key = "redisLock";
String uuid = UUID.randomUUID().toString();
try {
if (RedisLock.getLock(key, uuid, 30L)) {
log.info("进入了锁");
Thread.sleep(10000);
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
RedisLock.unLock(key, uuid);
}
log.info("方法执行完成");
return "程序结束";}RedisTemplate封装redis锁（2）
package com.util;import lombok.extern.slf4j.Slf4j;import org.springframework.dao.DataAccessException;import org.springframework.data.redis.connection.RedisConnection;import org.springframework.data.redis.connection.RedisStringCommands;import org.springframework.data.redis.core.RedisCallback;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.script.RedisScript;import org.springframework.data.redis.core.types.Expiration;import java.util.Arrays;import java.util.UUID;@Slf4jpublic class HighRedisLock implements AutoCloseable{
private RedisTemplate redisTemplate;
private String key;
private String value;
private Long expireTime;
private static String script = "if redis.call(\"get\",KEYS[1]) == ARGV[1] then\n" +
"\treturn redis.call(\"del\",KEYS[1])\n" +
"else\n" +
" \treturn 0\t\n" +
"end ";
public HighRedisLock(RedisTemplate redisTemplate, String key, Long expireTime) {
this.redisTemplate = redisTemplate;
this.key = key;
this.value = UUID.randomUUID().toString();
this.expireTime = expireTime;
}
public Boolean getLock() {
RedisStringCommands.SetOption setOption = RedisStringCommands.SetOption.ifAbsent();
Expiration expiration = Expiration.seconds(expireTime);
RedisCallback booleanRedisCallback = new RedisCallback() {
@Override
public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
return connection.set(redisTemplate.getKeySerializer().serialize(key), redisTemplate.getValueSerializer().serialize(value), expiration, setOption);
}
};
return (Boolean) redisTemplate.execute(booleanRedisCallback);
}
public Boolean unLock() {
RedisScript redisScript = RedisScript.of(script, Boolean.class);
return (Boolean) redisTemplate.execute(redisScript, Arrays.asList(key), value);
}
@Override
public void close() throws Exception {
unLock();
}} @Autowiredprivate RedisTemplate redisTemplate;@GetMapping("/highRedisLock")public String highRedisLock() {
log.info("进入了方法");
try (HighRedisLock redisLock = new HighRedisLock(redisTemplate, "highRedisLock", 30L)) {
if (redisLock.getLock()) {
log.info("进入了锁");
Thread.sleep(10000);
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
log.info("方法执行完成");
return "程序结束";}以上是“redis分布式锁的实现示例”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！
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