redis分布式鎖

Redisson

redisson和下列一下自行封裝兩種方式的區別（場景）：

1. redisson未獲取到鎖的會進入等待，直到獲取到鎖，
2. 另外兩種方式如果未獲取到鎖，會放棄，不會執行業務代碼，

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson-spring-boot-starter</artifactId>
    <version>3.13.6</version>
</dependency>

@Autowired
private Redisson redisson;

@GetMapping("/redissonLock")
public String redissonLock() {
    log.info("進入了方法");
    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 {
        lock.unlock();
    }
    return "運行結束";
}    

RedisTemplate封裝redis鎖（1）

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

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;

@Component
public 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<Boolean> booleanRedisCallback = new RedisCallback<Boolean>() {
            @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<Boolean> redisScript = RedisScript.of(script, Boolean.class);
        return (Boolean) redisTemplate.execute(redisScript, Arrays.asList(key), value);
    }
}

@GetMapping("/redisLock")
public String redisLock() {
    log.info("進入了方法");
    String key = "redisLock";
    String uuid = UUID.randomUUID().toString();
    try {
        if (RedisLock.getLock(key, uuid, 30L)) {
            log.info("進入了鎖");
            Thread.sleep(10000);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    } finally {
        RedisLock.unLock(key, uuid);
    }
    log.info("方法執行完成");
    return "程式結束";
}

RedisTemplate封裝redis鎖（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;

@Slf4j
public 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<Boolean> booleanRedisCallback = new RedisCallback<Boolean>() {
            @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<Boolean> redisScript = RedisScript.of(script, Boolean.class);
        return (Boolean) redisTemplate.execute(redisScript, Arrays.asList(key), value);
    }

    @Override
    public void close() throws Exception {
        unLock();
    }
}

@Autowired
private RedisTemplate redisTemplate;

@GetMapping("/highRedisLock")
public String highRedisLock() {
    log.info("進入了方法");
    try (HighRedisLock redisLock = new HighRedisLock(redisTemplate, "highRedisLock", 30L)) {
        if (redisLock.getLock()) {
            log.info("進入了鎖");
            Thread.sleep(10000);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
    log.info("方法執行完成");
    return "程式結束";
}