SpringBoot+Redisson实现分布式锁

目录

  • 项目结构
    • pom.xml
    • application.yml
    • RedissonProperties
    • RedissonAutoConfiguration
    • DistributedLocker
    • RedissonDistributedLocker
    • RedissonLockUtil
    • RedissonLockApplication
    • TestController
  • 测试结果
  • Redisson分布式锁原理



源码见gitee
链接: https://gitee.com/qiu_yunzhao/distributed_lock.

项目结构

SpringBoot+Redisson实现分布式锁_第1张图片

pom.xml

依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.haoqian</groupId>
    <artifactId>redission_lock</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redission_lock</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

配置文件

redisson:
  # 单机
  address: 127.0.0.1:6931
  password: aaaaaa
  database: 10

#  # 哨兵集群
#  master-name: mymaster
#  password: aaaaaa
#  sentinel-addresses:
#    - 10.47.91.83:26379
#    - 10.47.91.83:26380
#    - 10.47.91.83:26381

RedissonProperties

redisson配置文件的装配类

package com.haoqian.redission_lock.config;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "redisson")
public class RedissonProperties {

    private int timeout = 3000; // 连接超时时间

    private String address;     // 单机redis地址

    private String password;    // redis密码

    private int database = 0;   // 使用的redis库号

    private int connectionPoolSize = 64;  // 连接池大小

    private int connectionMinimumIdleSize = 10; // 连接池中的最小空闲连接

    private int slaveConnectionPoolSize = 250;  // 从节点连接池大小

    private int masterConnectionPoolSize = 250; // 主节点连接池大小

    private String masterName; // 主节点名称

    private String[] sentinelAddresses; // 集群地址

    public int getTimeout() {
        return timeout;
    }

    public void setTimeout(int timeout) {
        this.timeout = timeout;
    }

    public int getSlaveConnectionPoolSize() {
        return slaveConnectionPoolSize;
    }

    public void setSlaveConnectionPoolSize(int slaveConnectionPoolSize) {
        this.slaveConnectionPoolSize = slaveConnectionPoolSize;
    }

    public int getMasterConnectionPoolSize() {
        return masterConnectionPoolSize;
    }

    public void setMasterConnectionPoolSize(int masterConnectionPoolSize) {
        this.masterConnectionPoolSize = masterConnectionPoolSize;
    }

    public String[] getSentinelAddresses() {
        return sentinelAddresses;
    }

    public void setSentinelAddresses(String[] sentinelAddresses) {
        this.sentinelAddresses = sentinelAddresses;
    }

    public String getMasterName() {
        return masterName;
    }

    public void setMasterName(String masterName) {
        this.masterName = masterName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getDatabase() {
        return this.database;
    }

    public void setDatabase(int database) {
        this.database = database;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public int getConnectionPoolSize() {
        return connectionPoolSize;
    }

    public void setConnectionPoolSize(int connectionPoolSize) {
        this.connectionPoolSize = connectionPoolSize;
    }

    public int getConnectionMinimumIdleSize() {
        return connectionMinimumIdleSize;
    }

    public void setConnectionMinimumIdleSize(int connectionMinimumIdleSize) {
        this.connectionMinimumIdleSize = connectionMinimumIdleSize;
    }
}

RedissonAutoConfiguration

启动springboot是 RedissonClient 注入到spring容器,并装配工具类RedissonLockUtil

package com.haoqian.redission_lock.config;

import com.haoqian.redission_lock.distributedLock.DistributedLocker;
import com.haoqian.redission_lock.distributedLock.RedissonDistributedLocker;
import com.haoqian.redission_lock.Utils.RedissonLockUtil;
import io.micrometer.core.instrument.util.StringUtils;
import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.redisson.config.SentinelServersConfig;
import org.redisson.config.SingleServerConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
@ConditionalOnClass(Config.class) // org.redisson.config.Config
@EnableConfigurationProperties(RedissonProperties.class) // 自定义redisson配置类
public class RedissonAutoConfiguration {

    @Autowired
    private RedissonProperties redissonProperties;

    /**
     * 哨兵模式自动装配
     *
     * @return
     */
    @Bean
    @ConditionalOnProperty(name = "redisson.master-name")
    RedissonClient redissonSentinelClient() {
        Config config = new Config();
        SentinelServersConfig serverConfig = config.useSentinelServers()
                .addSentinelAddress(redissonProperties.getSentinelAddresses())
                .setMasterName(redissonProperties.getMasterName())
                .setTimeout(redissonProperties.getTimeout())
                .setMasterConnectionPoolSize(redissonProperties.getMasterConnectionPoolSize())
                .setSlaveConnectionPoolSize(redissonProperties.getSlaveConnectionPoolSize())
                .setDatabase(redissonProperties.getDatabase());

        if (StringUtils.isNotBlank(redissonProperties.getPassword())) {
            serverConfig.setPassword(redissonProperties.getPassword());
        }
        return Redisson.create(config);
    }

    /**
     * 单机模式自动装配
     *
     * @return
     */
    @Bean
    @ConditionalOnProperty(name = "redisson.address")
    RedissonClient redissonSingleClient() {
        Config config = new Config();
        SingleServerConfig serverConfig = config.useSingleServer()
                .setAddress("redis://" + redissonProperties.getAddress())
                .setTimeout(redissonProperties.getTimeout())
                .setConnectionPoolSize(redissonProperties.getConnectionPoolSize())
                .setConnectionMinimumIdleSize(redissonProperties.getConnectionMinimumIdleSize())
                .setDatabase(redissonProperties.getDatabase());

        if (StringUtils.isNotBlank(redissonProperties.getPassword())) {
            serverConfig.setPassword(redissonProperties.getPassword());
        }

        return Redisson.create(config);
    }

    /**
     * 装配locker类,并将实例注入到 RedissLockUtil 中
     *
     * @return
     */
    @Bean
    DistributedLocker distributedLocker(RedissonClient redissonClient) {
        RedissonDistributedLocker locker = new RedissonDistributedLocker(redissonClient);
        RedissonLockUtil.setLocker(locker);
        return locker;
    }

}

DistributedLocker

自定义封装Redisson分布式锁的lock接口

package com.haoqian.redission_lock.distributedLock;

import java.util.concurrent.TimeUnit;

/**
 * 分布式锁接口
 */
public interface DistributedLocker {

    /**
     * 获取锁,如果锁不可用,则当前线程处于休眠状态,直到获得锁为止。
     *
     * @param lockKey
     */
    void lock(String lockKey);

    /**
     * 获取锁,如果锁不可用,则当前线程处于休眠状态,直到获得锁为止。
     * 如果获取到锁后,执行结束后调用 unlock(String lockKey) 解锁或达到超时时间后会自动释放锁
     * 默认时间单位是 TimeUnit.SECONDS
     *
     * @param lockKey
     * @param leaseTime
     */
    void lock(String lockKey, int leaseTime);

    /**
     * 获取锁,如果锁不可用,则当前线程处于休眠状态,直到获得锁为止。
     * 如果获取到锁后,执行结束后调用 unlock(String lockKey) 解锁或达到超时时间后会自动释放锁
     *
     * @param lockKey   // 锁唯一名称
     * @param leaseTime // 持有锁的时间
     * @param unit      // 指定 leaseTime 的时间单位
     */
    void lock(String lockKey, int leaseTime, TimeUnit unit);

    /**
     * 尝试获取锁,获取到立即返回true,未获取到立即返回false
     *
     * @param lockKey
     * @return
     */
    boolean tryLock(String lockKey);

    /**
     * 尝试获取锁,在等待时间内获取到锁则返回true,否则返回false,
     * 如果获取到锁,执行完后程序调用 unlock(String lockKey) 释放锁或在给定的超时时间leaseTime后释放锁
     *
     * @param lockKey
     * @param waitTime  // 尝试获取锁的等待时间
     * @param leaseTime // 持有锁的时间
     * @param unit      // 指定 leaseTime 的时间单位
     * @return
     */
    boolean tryLock(String lockKey, long waitTime, long leaseTime, TimeUnit unit) throws InterruptedException;

    /**
     * 锁是否被任意一个线程锁持有
     *
     * @param lockKey
     * @return
     */
    boolean isLocked(String lockKey);

    /**
     * 释放锁
     *
     * @param lockKey
     */
    void unlock(String lockKey);
}

RedissonDistributedLocker

自定义封装Redisson分布式锁的lock接口实现类

package com.haoqian.redission_lock.distributedLock;

import com.haoqian.redission_lock.distributedLock.DistributedLocker;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;

import java.util.concurrent.TimeUnit;

public class RedissonDistributedLocker implements DistributedLocker {

    private RedissonClient redissonClient;

    public RedissonDistributedLocker() {
    }

    public RedissonDistributedLocker(RedissonClient redissonClient) {
        this.redissonClient = redissonClient;
    }

    @Override
    public void lock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock();
    }

    @Override
    public void lock(String lockKey, int leaseTime) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(leaseTime, TimeUnit.SECONDS);
    }

    @Override
    public void lock(String lockKey, int leaseTime, TimeUnit unit) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(leaseTime, unit);
    }

    @Override
    public boolean tryLock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        return lock.tryLock();
    }

    @Override
    public boolean tryLock(String lockKey, long waitTime, long leaseTime, TimeUnit unit) throws InterruptedException {
        RLock lock = redissonClient.getLock(lockKey);
        return lock.tryLock(waitTime, leaseTime, unit);
    }

    @Override
    public boolean isLocked(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        return  lock.isLocked();
    }

    @Override
    public void unlock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.unlock();
    }

}

RedissonLockUtil

redis分布式锁工具类

package com.haoqian.redission_lock.Utils;

import com.haoqian.redission_lock.distributedLock.DistributedLocker;

import java.util.concurrent.TimeUnit;


/**
 * redisson 分布式锁帮助类
 */
public class RedissonLockUtil {
    private static DistributedLocker redissonLocker;

    public static void setLocker(DistributedLocker locker) {
        redissonLocker = locker;
    }

    /**
     * 获取锁
     *
     * @param lockKey
     */
    public static void lock(String lockKey) {
        redissonLocker.lock(lockKey);
    }


    /**
     * 获取锁,超时释放
     *
     * @param lockKey
     * @param leaseTime 持有锁的时间(单位:秒)
     */
    public static void lock(String lockKey, int leaseTime) {
        redissonLocker.lock(lockKey, leaseTime);
    }

    /**
     * 获取锁,超时释放,指定时间单位
     *
     * @param lockKey
     * @param leaseTime 持有锁的时间
     * @param unit      leaseTime的单位
     */
    public static void lock(String lockKey, int leaseTime, TimeUnit unit) {
        redissonLocker.lock(lockKey, leaseTime, unit);
    }

    /**
     * 尝试获取锁,获取到立即返回true,获取失败立即返回false
     *
     * @param lockKey
     * @return
     */
    public static boolean tryLock(String lockKey) {
        return redissonLocker.tryLock(lockKey);
    }

    /**
     * 尝试获取锁,在给定的waitTime时间内尝试,获取到返回true,获取失败返回false,获取到后再给定的leaseTime时间超时释放
     *
     * @param lockKey
     * @param waitTime
     * @param leaseTime
     * @param unit
     * @return
     * @throws InterruptedException
     */
    public static boolean tryLock(String lockKey, long waitTime, long leaseTime, TimeUnit unit) throws InterruptedException {
        return redissonLocker.tryLock(lockKey, waitTime, leaseTime, unit);
    }

    /**
     * 锁是否被任意一个线程锁持有
     *
     * @param lockKey
     * @return
     */
    public static boolean isLocked(String lockKey) {
        return redissonLocker.isLocked(lockKey);
    }

    /**
     * 解锁
     *
     * @param lockKey
     */
    public static void unlock(String lockKey) {
        redissonLocker.unlock(lockKey);
    }
}

RedissonLockApplication

主启动类

package com.haoqian.redission_lock;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class RedissonLockApplication {

    public static void main(String[] args) {
        SpringApplication.run(RedissonLockApplication.class, args);
    }

}

TestController

测试类

package com.haoqian.redission_lock.controller;

import com.haoqian.redission_lock.Utils.RedissonLockUtil;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.TimeUnit;

@RestController
public class TestController {

    /**
     * lock 会阻塞知道获取到锁
     */
    @GetMapping("/testLock1")
    public void testLock1() {
        for (int i = 0; i < 5; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {

                    try {
                        RedissonLockUtil.lock("RedissonLock");
                        System.out.println(Thread.currentThread().getName() + "获取到锁");
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        RedissonLockUtil.unlock("RedissonLock");
                        System.out.println(Thread.currentThread().getName() + "释放锁");
                    }

                }
            }).start();
        }
    }

    /**
     * tryLock
     * 1. 获取到锁后超过leaseTime会自动释放锁
     * 2. 超过waitTime未获取到锁会返回false放弃获取锁
     */
    @GetMapping("/testLock2")
    public void testLock2() {
        for (int i = 0; i < 5; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {

                    try {
                        boolean result = RedissonLockUtil.tryLock("Lock:lock2", 3, 2, TimeUnit.SECONDS);
                        System.out.println(Thread.currentThread().getName() + "是否获取到锁" + result);
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                    }

                }
            }).start();
        }
    }

    /**
     * 获取几次要释放几次,否则会阻塞
     */
    @GetMapping("/testLock3")
    public void testLock3() {
        for (int i = 0; i < 5; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {

                    try {
                        RedissonLockUtil.lock("RedissonLock");
                        RedissonLockUtil.lock("RedissonLock");
                        System.out.println(Thread.currentThread().getName() + "获取到锁");
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        RedissonLockUtil.unlock("RedissonLock");
                        // RedissonLockUtil.unlock("RedissonLock");
                        System.out.println(Thread.currentThread().getName() + "释放锁");
                    }

                }
            }).start();
        }
    }

}

测试结果

http://localhost:8080/testLock1 接口测试结果:
SpringBoot+Redisson实现分布式锁_第2张图片
http://localhost:8080/testLock2 接口测试结果:
SpringBoot+Redisson实现分布式锁_第3张图片
http://localhost:8080/testLock3 接口测试结果:
SpringBoot+Redisson实现分布式锁_第4张图片

Redisson分布式锁原理

获取锁的过程就是向redis中插入指定的key;
SpringBoot+Redisson实现分布式锁_第5张图片

释放锁的过程就是清除redis中已经插入的指定的key
SpringBoot+Redisson实现分布式锁_第6张图片

如果获取锁的时候redis中已经存在相同的key说明有线程已经获取了锁,不能对资源进行操作;

如果获取锁的时候redis中不存在相同的key说明没有线程获取到锁,可以对资源进行操作;




如果对redisson的原理感兴趣,可以参考我写的另一篇文章
链接: https://blog.csdn.net/QiuHaoqian/article/details/114311189.

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