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binbin.hou
2020-09-10 11:19:54 +08:00
parent 0509780502
commit 3a8c68a19d
17 changed files with 318 additions and 145 deletions
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29
lock-redis/pom.xml
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<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>lock</artifactId>
<groupId>com.github.houbb</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>lock-redis</artifactId>
<description>The lock depends on redis.</description>
<dependencies>
<!--============================== SELF ==============================-->
<dependency>
<groupId>com.github.houbb</groupId>
<artifactId>lock-api</artifactId>
</dependency>
<!--============================== OTHER ==============================-->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
</dependencies>
</project>

9
lock-redis/src/main/java/com/github/houbb/lock/redis/bs/LockRedisBs.java
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package com.github.houbb.lock.redis.bs;
/**
* 引导类
* @author binbin.hou
* @since 1.0.0
*/
public class LockRedisBs {
}

50
lock-redis/src/main/java/com/github/houbb/lock/redis/constant/LockRedisConst.java
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package com.github.houbb.lock.redis.constant;
/**
* redis 锁常量
*
* @author binbin.hou
* @since 0.0.1
*/
public final class LockRedisConst {
private LockRedisConst() {
}
/**
* 加锁成功
* @since 0.0.1
*/
public static final String LOCK_SUCCESS = "OK";
/**
* 如果不存在则设置值
* @since 0.0.1
*/
public static final String SET_IF_NOT_EXIST = "NX";
/**
* 设置过期时间
*
* 单位：milliseconds
* @since 0.0.1
*/
public static final String SET_WITH_EXPIRE_TIME = "PX";
/**
* 解锁成功
*
* @since 0.0.1
*/
public static final Long RELEASE_SUCCESS = 1L;
/**
* 默认的失效时间
*
* 暂时定为 30min
* @since 0.0.1
*/
public static final long DEFAULT_EXPIRE_MILLS = 1000 * 60 * 30L;
}

44
lock-redis/src/main/java/com/github/houbb/lock/redis/core/AbstractLockRedis.java
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package com.github.houbb.lock.redis.core;
import com.github.houbb.lock.api.core.ILock;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
/**
* 抽象实现
* @author binbin.hou
* @since 0.0.1
*/
public class AbstractLockRedis implements ILock {
@Override
public void lock() {
throw new UnsupportedOperationException();
}
@Override
public void lockInterruptibly() throws InterruptedException {
throw new UnsupportedOperationException();
}
@Override
public boolean tryLock() {
return false;
}
@Override
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
return false;
}
@Override
public void unlock() {
}
@Override
public Condition newCondition() {
throw new UnsupportedOperationException();
}
}

43
lock-redis/src/main/java/com/github/houbb/lock/redis/core/LockRedis.java
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package com.github.houbb.lock.redis.core;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
/**
* @author binbin.hou
* @since 1.0.0
*/
public class LockRedis extends AbstractLockRedis {
@Override
public void lock() {
}
@Override
public void lockInterruptibly() throws InterruptedException {
}
@Override
public boolean tryLock() {
return false;
}
@Override
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
final long timeMills = unit.toMillis(time);
return false;
}
@Override
public void unlock() {
}
@Override
public Condition newCondition() {
return null;
}
}

1
lock-redis/src/main/java/com/github/houbb/lock/redis/package-info.java
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package com.github.houbb.lock.redis;

15
lock-redis/src/main/java/com/github/houbb/lock/redis/support/id/IId.java
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package com.github.houbb.lock.redis.support.id;
/**
* @author binbin.hou
* @since 1.0.0
*/
public interface IId {
/**
* 返回唯一标识
* @return 唯一标识
*/
String id();
}

23
lock-redis/src/main/java/com/github/houbb/lock/redis/support/id/impl/IdUUID.java
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package com.github.houbb.lock.redis.support.id.impl;
import com.github.houbb.lock.redis.support.id.IId;
import java.util.UUID;
/**
* @author binbin.hou
* @since 1.0.0
*/
public class IdUUID implements IId {
/**
* 返回唯一标识
*
* @return 唯一标识
*/
@Override
public String id() {
return UUID.randomUUID().toString().replace("-","");
}
}

1
lock-redis/src/main/java/com/github/houbb/lock/redis/support/package-info.java
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package com.github.houbb.lock.redis.support;

29
lock-redis/src/main/java/com/github/houbb/lock/redis/support/redis/IRedisOperator.java
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package com.github.houbb.lock.redis.support.redis;
/**
* Redis 客户端
* @author binbin.hou
* @since 1.0.0
*/
public interface IRedisOperator {
/**
* 尝试获取分布式锁
*
* @param lockKey 锁
* @param requestId 请求标识
* @param expireTimeMills 超期时间
* @return 是否获取成功
*/
boolean tryLock(String lockKey, String requestId, int expireTimeMills);
/**
* 解锁
* @param lockKey 锁 key
* @param requestId 请求标识
* @return 结果
* @since 0.0.1
*/
boolean unlock(String lockKey, String requestId);
}

63
lock-redis/src/main/java/com/github/houbb/lock/redis/support/redis/impl/JedisOperator.java
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package com.github.houbb.lock.redis.support.redis.impl;
import com.github.houbb.lock.redis.constant.LockRedisConst;
import com.github.houbb.lock.redis.support.redis.IRedisOperator;
import redis.clients.jedis.Jedis;
import java.util.Collections;
/**
* Redis 客户端
* @author binbin.hou
* @since 0.0.1
*/
public class JedisOperator implements IRedisOperator {
/**
* jedis 客户端
* @since 0.0.1
*/
private final Jedis jedis;
public JedisOperator(Jedis jedis) {
this.jedis = jedis;
}
/**
* 尝试获取分布式锁
*
* expireTimeMills 保证当前进程挂掉，也能释放锁
*
* requestId 保证解锁的是当前进程（锁的持有者）
*
* @param lockKey 锁
* @param requestId 请求标识
* @param expireTimeMills 超期时间
* @return 是否获取成功
* @since 0.0.1
*/
@Override
public boolean tryLock(String lockKey, String requestId, int expireTimeMills) {
String result = jedis.set(lockKey, requestId, LockRedisConst.SET_IF_NOT_EXIST, LockRedisConst.SET_WITH_EXPIRE_TIME, expireTimeMills);
return LockRedisConst.LOCK_SUCCESS.equals(result);
}
/**
* 解锁
*
* （1）使用 requestId，保证为当前锁的持有者
* （2）使用 lua 脚本，保证执行的原子性。
*
* @param lockKey 锁 key
* @param requestId 请求标识
* @return 结果
* @since 0.0.1
*/
@Override
public boolean unlock(String lockKey, String requestId) {
String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
Object result = jedis.eval(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));
return LockRedisConst.RELEASE_SUCCESS.equals(result);
}
}