Java で分散システム アーキテクチャ設計を実装する方法

// 服务注册
public class ServiceRegistry {
    private ZooKeeper zooKeeper;
    private String servicePath;

    public void register(String serviceName, String serviceAddress) {
        if (zooKeeper != null) {
            try {
                String serviceNode = servicePath + "/" + serviceName;
                zooKeeper.create(serviceNode, serviceAddress.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    // 初始化ZooKeeper连接
    public void init() {
        try {
            // 连接到ZooKeeper服务器
            zooKeeper = new ZooKeeper("localhost:2181", 5000, null);
            // 创建服务节点目录
            if (zooKeeper.exists(servicePath, false) == null) {
                zooKeeper.create(servicePath, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

// 服务发现
public class ServiceDiscovery {
    private ZooKeeper zooKeeper;
    private String servicePath;

    public List<String> discover(String serviceName) {
        List<String> serviceList = new ArrayList<>();
        if (zooKeeper != null) {
            try {
                String serviceNode = servicePath + "/" + serviceName;
                List<String> nodeList = zooKeeper.getChildren(serviceNode, false);
                for (String node : nodeList) {
                    String serviceAddress = new String(zooKeeper.getData(serviceNode + "/" + node, false, null));
                    serviceList.add(serviceAddress);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return serviceList;
    }

    // 初始化ZooKeeper连接
    public void init() {
        try {
            // 连接到ZooKeeper服务器
            zooKeeper = new ZooKeeper("localhost:2181", 5000, null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

// 任务生成者
public class TaskProducer {
    private Connection connection;
    private Channel channel;

    public void sendTask(String task) {
        try {
            channel.basicPublish("exchange.task", "task.routing.key", null, task.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // 初始化RabbitMQ连接
    public void init() {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        try {
            connection = factory.newConnection();
            channel = connection.createChannel();
            channel.exchangeDeclare("exchange.task", BuiltinExchangeType.DIRECT);
            channel.queueDeclare("queue.task", false, false, false, null);
            channel.queueBind("queue.task", "exchange.task", "task.routing.key");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

// 任务处理者
public class TaskConsumer {
    private Connection connection;
    private Channel channel;

    public void processTask() {
        try {
            channel.basicConsume("queue.task", true, (consumerTag, message) -> {
                String task = new String(message.getBody(), StandardCharsets.UTF_8);
                // 处理任务
                // ...
            }, consumerTag -> {});
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 初始化RabbitMQ连接
    public void init() {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        try {
            connection = factory.newConnection();
            channel = connection.createChannel();
            channel.exchangeDeclare("exchange.task", BuiltinExchangeType.DIRECT);
            channel.queueDeclare("queue.task", false, false, false, null);
            channel.queueBind("queue.task", "exchange.task", "task.routing.key");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

// 节点
public class Node {
    private String ip;
    private int port;
    // ...

    public Node(String ip, int port) {
        this.ip = ip;
        this.port = port;
    }
    
    // ...

    // 获取节点的哈希值
    public String getHash() {
        return DigestUtils.md5DigestAsHex((ip + ":" + port).getBytes());
    }
}

// 一致性哈希环
public class ConsistentHashRing {
    private TreeMap<Long, Node> ring;
    private List<Node> nodes;

    public Node getNode(String key) {
        long hash = hash(key);
        Long nodeHash = ring.ceilingKey(hash);
        if (nodeHash == null) {
            nodeHash = ring.firstKey();
        }
        return ring.get(nodeHash);
    }

    // 根据字符串计算哈希值
   private long hash(String key) {
        return DigestUtils.md5DigestAsHex(key.getBytes()).hashCode();
    }

    // 添加节点到哈希环
    public void addNode(Node node) {
        long hash = hash(node.getHash());
        ring.put(hash, node);
        nodes.add(node);
    }

    // 删除节点
    public void removeNode(Node node) {
        long hash = hash(node.getHash());
        ring.remove(hash);
        nodes.remove(node);
    }
}