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feat: 分布式示例
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‎codes/java-distributed/java-distributed-id/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.github.dunwu.distributed</groupId>
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<artifactId>java-distributed</artifactId>
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<version>1.0.0</version>
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</parent>
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<groupId>io.github.dunwu.javatech</groupId>
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<artifactId>java-distributed-id</artifactId>
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<version>1.0.0</version>
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<packaging>jar</packaging>
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<name>${project.artifactId}</name>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<java.version>1.8</java.version>
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<maven.compiler.source>${java.version}</maven.compiler.source>
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<maven.compiler.target>${java.version}</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.apache.zookeeper</groupId>
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<artifactId>zookeeper</artifactId>
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</dependency>
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<dependency>
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<groupId>org.apache.curator</groupId>
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<artifactId>curator-recipes</artifactId>
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</dependency>
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<dependency>
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<groupId>redis.clients</groupId>
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<artifactId>jedis</artifactId>
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</dependency>
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<dependency>
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<groupId>cn.hutool</groupId>
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<artifactId>hutool-all</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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<optional>true</optional>
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</dependency>
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</dependencies>
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</project>

‎codes/java-distributed/java-distributed-id/src/main/java/io/github/dunwu/distributed/id/ZookeeperDistributedId.java

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package io.github.dunwu.distributed.id;
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import cn.hutool.core.collection.CollectionUtil;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.curator.RetryPolicy;
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import org.apache.curator.framework.CuratorFramework;
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import org.apache.curator.framework.CuratorFrameworkFactory;
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import org.apache.curator.retry.ExponentialBackoffRetry;
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import org.apache.zookeeper.CreateMode;
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import java.util.List;
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/**
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* ZK 分布式 ID
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*
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* @author <a href="mailto:forbreak@163.com">Zhang Peng</a>
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* @date 2024-12-20
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*/
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@Slf4j
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public class ZookeeperDistributedId {
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public static void main(String[] args) throws Exception {
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// 获取客户端
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RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
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CuratorFramework client = CuratorFrameworkFactory.newClient("127.0.0.1:2181", retryPolicy);
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// 开启会话
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client.start();
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String id1 = client.create()
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.creatingParentsIfNeeded()
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.withMode(CreateMode.PERSISTENT_SEQUENTIAL)
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.forPath("/zkid/id_");
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log.info("id: {}", id1);
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String id2 = client.create()
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.creatingParentsIfNeeded()
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.withMode(CreateMode.PERSISTENT_SEQUENTIAL)
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.forPath("/zkid/id_");
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log.info("id: {}", id2);
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List<String> children = client.getChildren().forPath("/zkid");
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if (CollectionUtil.isNotEmpty(children)) {
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for (String child : children) {
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client.delete().forPath("/zkid/" + child);
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}
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}
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client.delete().forPath("/zkid");
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// 关闭客户端
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client.close();
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}
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}

‎codes/java-distributed/java-distributed-id/src/main/java/io/github/dunwu/distributed/id/ZookeeperDistributedId2.java

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package io.github.dunwu.distributed.id;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.curator.RetryPolicy;
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import org.apache.curator.framework.CuratorFramework;
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import org.apache.curator.framework.CuratorFrameworkFactory;
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import org.apache.curator.framework.recipes.atomic.AtomicValue;
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import org.apache.curator.framework.recipes.atomic.DistributedAtomicLong;
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import org.apache.curator.retry.ExponentialBackoffRetry;
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/**
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* ZK 分布式 ID
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* <p>
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* 基于原子计数器生成 ID
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*
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* @author <a href="mailto:forbreak@163.com">Zhang Peng</a>
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* @date 2024-12-20
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*/
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@Slf4j
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public class ZookeeperDistributedId2 {
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public static void main(String[] args) throws Exception {
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// 获取客户端
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RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
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CuratorFramework client = CuratorFrameworkFactory.newClient("127.0.0.1:2181", retryPolicy);
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DistributedAtomicLong atomicLong = new DistributedAtomicLong(client, "/zkid", retryPolicy);
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// 开启会话
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client.start();
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// 基于原子计数器生成 ID
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AtomicValue<Long> id1 = atomicLong.increment();
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log.info("id: {}", id1.postValue());
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AtomicValue<Long> id2 = atomicLong.increment();
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log.info("id: {}", id2.postValue());
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// 清理节点
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client.delete().forPath("/zkid");
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// 关闭客户端
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client.close();
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}
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}

‎codes/java-distributed/java-distributed-id/src/main/resources/scripts/fixed_window_rate_limit.lua

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-- 缓存 Key
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local key = KEYS[1]
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-- 访问请求数
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local permits = tonumber(ARGV[1])
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-- 过期时间
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local seconds = tonumber(ARGV[2])
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-- 限流阈值
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local limit = tonumber(ARGV[3])
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-- 获取统计值
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local count = tonumber(redis.call('GET', key) or "0")
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if count + permits > limit then
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-- 请求拒绝
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return -1
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else
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-- 请求通过
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redis.call('INCRBY', key, permits)
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redis.call('EXPIRE', key, seconds)
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return count + permits
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end

‎codes/java-distributed/java-distributed-id/src/main/resources/scripts/token_bucket_rate_limit.lua

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local tokenKey = KEYS[1]
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local timeKey = KEYS[2]
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-- 申请令牌数
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local permits = tonumber(ARGV[1])
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-- QPS
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local qps = tonumber(ARGV[2])
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-- 桶的容量
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local capacity = tonumber(ARGV[3])
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-- 当前时间（单位：毫秒）
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local nowMillis = tonumber(ARGV[4])
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-- 填满令牌桶所需要的时间
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local fillTime = capacity / qps
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local ttl = math.min(capacity, math.floor(fillTime * 2))
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local currentTokenNum = tonumber(redis.call("GET", tokenKey))
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if currentTokenNum == nil then
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currentTokenNum = capacity
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end
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local endTimeMillis = tonumber(redis.call("GET", timeKey))
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if endTimeMillis == nil then
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endTimeMillis = 0
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end
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local gap = nowMillis - endTimeMillis
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local newTokenNum = math.max(0, gap * qps / 1000)
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local currentTokenNum = math.min(capacity, currentTokenNum + newTokenNum)
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if currentTokenNum < permits then
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-- 请求拒绝
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return -1
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else
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-- 请求通过
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local finalTokenNum = currentTokenNum - permits
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redis.call("SETEX", tokenKey, ttl, finalTokenNum)
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redis.call("SETEX", timeKey, ttl, nowMillis)
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return finalTokenNum
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end

‎codes/java-distributed/java-load-balance/pom.xml

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<artifactId>java-load-balance</artifactId>
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<version>1.0.0</version>
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<packaging>jar</packaging>
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<name>${project.artifactId}</name>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

‎codes/java-distributed/java-rate-limit/pom.xml

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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.github.dunwu.javatech</groupId>
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<groupId>io.github.dunwu.distributed</groupId>
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<artifactId>java-rate-limit</artifactId>
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<version>1.0.0</version>
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<packaging>jar</packaging>
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<name>${project.artifactId}</name>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

‎codes/java-distributed/java-task/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.github.dunwu.distributed</groupId>
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<artifactId>java-distributed</artifactId>
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<version>1.0.0</version>
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</parent>
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<groupId>io.github.dunwu.distributed</groupId>
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<artifactId>java-task</artifactId>
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<version>1.0.0</version>
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<packaging>jar</packaging>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<java.version>1.8</java.version>
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<maven.compiler.source>${java.version}</maven.compiler.source>
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<maven.compiler.target>${java.version}</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>cn.hutool</groupId>
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<artifactId>hutool-all</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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<version>1.2.3</version>
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<optional>true</optional>
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</dependency>
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</dependencies>
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</project>

‎codes/java-distributed/java-task/src/main/java/io/github/dunwu/local/task/DelayQueueExample.java

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package io.github.dunwu.local.task;
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import cn.hutool.core.date.DateUtil;
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import lombok.extern.slf4j.Slf4j;
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import java.util.Date;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.DelayQueue;
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import java.util.concurrent.Delayed;
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import java.util.concurrent.TimeUnit;
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@Slf4j
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public class DelayQueueExample {
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public static void main(String[] args) throws InterruptedException {
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BlockingQueue<SampleTask> delayQueue = new DelayQueue<>();
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long now = System.currentTimeMillis();
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delayQueue.put(new SampleTask(now + 1000));
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delayQueue.put(new SampleTask(now + 2000));
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delayQueue.put(new SampleTask(now + 3000));
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for (int i = 0; i < 3; i++) {
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log.info("task 执行时间：{}", DateUtil.format(new Date(delayQueue.take().getTime()), "yyyy-MM-dd HH:mm:ss"));
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}
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}
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static class SampleTask implements Delayed {
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long time;
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public SampleTask(long time) {
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this.time = time;
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}
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public long getTime() {
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return time;
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}
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@Override
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public int compareTo(Delayed o) {
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return Long.compare(this.getDelay(TimeUnit.MILLISECONDS), o.getDelay(TimeUnit.MILLISECONDS));
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}
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@Override
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public long getDelay(TimeUnit unit) {
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return unit.convert(time - System.currentTimeMillis(), TimeUnit.MILLISECONDS);
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}
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}
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}
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‎codes/java-distributed/java-task/src/main/java/io/github/dunwu/local/task/ScheduledExecutorServiceExample.java

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package io.github.dunwu.local.task;
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import cn.hutool.core.date.DateUtil;
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import lombok.extern.slf4j.Slf4j;
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import java.util.Date;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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@Slf4j
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public class ScheduledExecutorServiceExample {
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public static void main(String[] args) {
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// 创建一个 ScheduledExecutorService 对象，它将使用一个线程池来执行任务
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ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
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// 创建一个 Runnable 对象，这个任务将在 2 秒后执行，并且每 1 秒重复执行一次
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Runnable task = () -> {
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log.info("task 执行时间：{}", DateUtil.format(new Date(), "yyyy-MM-dd HH:mm:ss"));
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};
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// 安排任务在 2 秒后执行，并且每 1 秒重复执行一次
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executor.scheduleAtFixedRate(task, 2, 1, TimeUnit.SECONDS);
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// 主线程等待 10 秒后结束
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try {
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Thread.sleep(10000);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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// 关闭 executor，这将停止所有正在执行的任务，并拒绝新任务的提交
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executor.shutdown();
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}
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}

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