Java-Entwicklung: So führen Sie verteiltes Caching und Datensynchronisierung durch

// 引入Redis客户端库
import redis.clients.jedis.Jedis;

public class RedisCache {
    private Jedis jedis;

    public RedisCache(String host, int port) {
        jedis = new Jedis(host, port);
    }

    public void set(String key, String value) {
        jedis.set(key, value);
    }

    public String get(String key) {
        return jedis.get(key);
    }

    public void delete(String key) {
        jedis.del(key);
    }
}

// 使用示例
RedisCache cache = new RedisCache("localhost", 6379);
cache.set("key", "value");
String value = cache.get("key");
cache.delete("key");

// 发布者
import redis.clients.jedis.Jedis;

public class Publisher {
    private Jedis jedis;

    public Publisher(String host, int port) {
        jedis = new Jedis(host, port);
    }

    public void publish(String channel, String message) {
        jedis.publish(channel, message);
    }
}

// 订阅者
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPubSub;

public class Subscriber extends JedisPubSub {
    private Jedis jedis;

    public Subscriber(String host, int port) {
        jedis = new Jedis(host, port);
    }

    public void subscribe(String channel) {
        jedis.subscribe(this, channel);
    }

    @Override
    public void onMessage(String channel, String message) {
        // 处理接收到的消息
    }
}

// 使用示例
Publisher publisher = new Publisher("localhost", 6379);
publisher.publish("channel", "message");

Subscriber subscriber = new Subscriber("localhost", 6379);
subscriber.subscribe("channel");

// 引入ZooKeeper客户端库
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;

import java.io.IOException;

public class DistributedLock implements Watcher {
    private ZooKeeper zooKeeper;
    private String lockPath;

    public DistributedLock(String host, int port, String lockPath) throws IOException {
        zooKeeper = new ZooKeeper(host + ":" + port, 3000, this);
        this.lockPath = lockPath;
    }

    public void acquireLock() throws KeeperException, InterruptedException {
        // 创建锁节点
        zooKeeper.create(lockPath, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    }

    public void releaseLock() throws KeeperException, InterruptedException {
        // 删除锁节点
        zooKeeper.delete(lockPath, -1);
    }

    @Override
    public void process(WatchedEvent event) {

    }
}

// 使用示例
DistributedLock lock = new DistributedLock("localhost", 2181, "/lock");
lock.acquireLock();
// 修改共享数据
lock.releaseLock();