Java で高可用性と負荷分散システム アーキテクチャを実装する方法

public class CircuitBreaker {
    private boolean isOpen;

    public CircuitBreaker() {
        isOpen = false;
    }

    public void trip() {
        isOpen = true;
    }

    public void reset() {
        isOpen = false;
    }

    public boolean allowRequest() {
        return !isOpen;
    }
}

public class Service {
    private CircuitBreaker circuitBreaker;

    public Service(CircuitBreaker circuitBreaker) {
        this.circuitBreaker = circuitBreaker;
    }

    public void request() {
        if (circuitBreaker.allowRequest()) {
            // 发送请求
        } else {
            // 进行故障转移
        }
    }
}

public class ServiceNode {
    private boolean isPrimary;

    public ServiceNode(boolean isPrimary) {
        this.isPrimary = isPrimary;
    }

    public void processRequest() {
        if (isPrimary) {
            // 处理请求
        } else {
            // 转发请求给主节点
        }
    }
}

public class Cluster {
    private List nodes;

    public Cluster(int nodeCount) {
        nodes = new ArrayList<>();
        for (int i = 0; i < nodeCount; i++) {
            nodes.add(new ServiceNode(i == 0));
        }
    }

    public void processRequest() {
        for (ServiceNode node : nodes) {
            node.processRequest();
        }
    }
}

public class LoadBalancer {
    private List nodes;
    private int currentIndex;

    public LoadBalancer(List nodes) {
        this.nodes = nodes;
        currentIndex = 0;
    }

    public ServiceNode getNextNode() {
        ServiceNode node = nodes.get(currentIndex);
        currentIndex = (currentIndex + 1) % nodes.size();
        return node;
    }
}

public class Service {
    private LoadBalancer loadBalancer;

    public Service(LoadBalancer loadBalancer) {
        this.loadBalancer = loadBalancer;
    }

    public void request() {
        ServiceNode node = loadBalancer.getNextNode();
        // 发送请求给选定的节点
    }
}

public class LoadBalancer {
    private List nodes;

    public LoadBalancer(List nodes) {
        this.nodes = nodes;
    }

    public ServiceNode getNode(String requestKey) {
        int hash = Math.abs(requestKey.hashCode());
        int index = hash % nodes.size();
        return nodes.get(index);
    }
}

public class Service {
    private LoadBalancer loadBalancer;

    public Service(LoadBalancer loadBalancer) {
        this.loadBalancer = loadBalancer;
    }

    public void request(String requestKey) {
        ServiceNode node = loadBalancer.getNode(requestKey);
        // 发送请求给选定的节点
    }
}