#微服务模式

flowchart TB
    subgraph Client["客户端"]
        Mobile[移动端]
        Web[Web 端]
    end

    subgraph Gateway["API 网关层"]
        GW[Spring Cloud Gateway]
    end

    subgraph Discovery["服务注册与发现"]
        Registry[Nacos / Consul]
    end

    subgraph Services["业务服务层"]
        Order[订单服务]
        Inventory[库存服务]
        Payment[支付服务]
        User[用户服务]
    end

    subgraph Resilience["弹性与容错"]
        CB[断路器]
        Retry[重试]
        Bulkhead[隔板]
    end

    subgraph Config["配置中心"]
        ConfigCenter[配置中心]
    end

    subgraph Observability["可观测性"]
        Tracing[链路追踪]
        Metrics[指标监控]
        Logging[日志中心]
    end

    Mobile & Web --> GW
    GW --> CB
    CB --> Retry
    Retry --> Services

    Services --> Bulkhead
    Bulkhead --> Inventory

    Services --> Registry
    Registry --> Services
    ConfigCenter --> Services

    Services --> Tracing
    Tracing --> Metrics
    Metrics --> Logging

flowchart LR
    subgraph Phase1["阶段一：单体"]
        M[单体应用]
        DB[(数据库)]
        M --> DB
    end

    subgraph Phase2["阶段二：前后端分离 + 网关"]
        FE[前端]
        GW[API 网关]
        M2[单体应用]
        M2 --> DB
        FE --> GW
        GW --> M2
    end

    subgraph Phase3["阶段三：服务拆分"]
        GW2[API 网关]
        S1[服务 A]
        S2[服务 B]
        S3[服务 C]
        Registry2[注册中心]
        Config2[配置中心]
        GW2 --> Registry2
        Registry2 --> S1 & S2 & S3
        S1 & S2 & S3 --> Config2
        S1 & S2 & S3 --> DB
    end

    subgraph Phase4["阶段四：完整微服务"]
        GW3[API 网关]
        CB3[断路器]
        Retry3[重试]
        S4A[服务 A]
        S4B[服务 B]
        S4C[服务 C]
        Registry3[注册中心]
        Config3[配置中心]
        Tracing3[链路追踪]
        Metrics3[指标监控]

        FE3[前端] --> GW3
        GW3 --> CB3
        CB3 --> Retry3
        Retry3 --> Registry3
        Registry3 --> S4A & S4B & S4C
        S4A & S4B & S4C --> Config3
        S4A & S4B & S4C --> Tracing3
        Tracing3 --> Metrics3
    end

    Phase1 --> Phase2 --> Phase3 --> Phase4