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+# OrderConsumer 业务流程图
+
+## 概览
+
+OrderConsumer 是订单消息的消费者，负责从 `orders.queue` 接收消息，解析并持久化订单数据到数据库。它实现了自动重试机制，失败的消息会自动重试，超过重试次数的消息会被发送到错误队列等待人工处理。
+
+---
+
+## 完整流程图
+
+```mermaid
+flowchart TD
+    Start([消息到达 orders.queue]) --> CheckDebug{是否开启调试延迟?}
+    CheckDebug -->|是| Sleep[休眠 N 秒]
+    CheckDebug -->|否| GetRetry[获取重试次数]
+    Sleep --> GetRetry
+
+    GetRetry --> ParseRetry{检查 application_headers}
+
+    ParseRetry -->|不存在| FirstTime[首次处理 retryCount=0]
+    ParseRetry -->|存在| ReadXDeath[读取 x-death count]
+    ReadXDeath --> RetryCount[retryCount = count]
+
+    FirstTime --> LogRetry[记录重试次数]
+    RetryCount --> LogRetry
+
+    LogRetry --> TryBlock[开始处理消息]
+
+    TryBlock --> CreateParser[创建 Parser]
+    CreateParser --> ExtractMeta[提取 metadata]
+    ExtractMeta --> EntityMatch[匹配实体对象]
+    EntityMatch --> EntityMap[转换 raw_data]
+    EntityMap --> BeginTx[开始事务]
+
+    BeginTx --> LoopSave[保存实体]
+    LoopSave --> Commit[提交事务]
+    Commit --> ReturnACK[返回 ACK]
+    ReturnACK --> End([处理完成])
+
+    TryBlock -->|异常| CatchError[捕获异常]
+    CatchError --> Rollback[回滚事务]
+    Rollback --> LogError[记录错误]
+    LogError --> CheckMaxRetry{超过重试次数?}
+
+    CheckMaxRetry -->|是| ExceededLog[超过重试次数]
+    CheckMaxRetry -->|否| NotExceededLog[未超过次数]
+
+    ExceededLog --> SendError[发送到错误队列]
+    SendError --> BuildErrorMsg[构建错误消息]
+    BuildErrorMsg --> ProduceError[发送到 errors.exchange]
+    ProduceError --> TrySend{发送成功?}
+
+    TrySend -->|成功| SuccessLog[记录成功日志]
+    TrySend -->|失败| FailLog[记录失败日志]
+
+    SuccessLog --> AckAfterError[返回 ACK]
+    FailLog --> AckAfterError
+    AckAfterError --> EndError([已发送到错误队列])
+
+    NotExceededLog --> ReturnNACK[返回 NACK]
+    ReturnNACK --> ToDLX([进入 DLX])
+    ToDLX --> ToRetryQueue[进入重试队列]
+    ToRetryQueue --> WaitTTL[等待 5 秒]
+    WaitTTL --> BackToMain[TTL到期回流]
+    BackToMain --> BackToQueue[回到 orders.queue]
+    BackToQueue --> Start
+
+    style Start fill:#e1f5e1
+    style End fill:#e1f5e1
+    style EndError fill:#ffe1e1
+    style ReturnACK fill:#90EE90
+    style AckAfterError fill:#FFB6C1
+    style ReturnNACK fill:#FFD700
+    style SendError fill:#FF6B6B
+    style Commit fill:#4CAF50
+    style Rollback fill:#F44336
+```
+
+---
+
+## 消息流转状态图
+
+```mermaid
+stateDiagram-v2
+    [*] --> OrdersQueue: 新消息到达
+
+    OrdersQueue --> Processing: Consumer 消费
+
+    Processing --> Success: 处理成功
+    Processing --> FirstFailure: 首次失败 count=0
+    Processing --> SecondFailure: 第2次失败 count=1
+    Processing --> ThirdFailure: 第3次失败 count=2
+    Processing --> MaxRetryExceeded: 超过重试次数
+
+    Success --> [*]: ACK
+
+    FirstFailure --> DLX: NACK requeue=false
+    SecondFailure --> DLX: NACK requeue=false
+    ThirdFailure --> DLX: NACK requeue=false
+
+    DLX --> RetryQueue: routing_key retry
+
+    RetryQueue --> RetryQueue: 等待 TTL 5秒
+    RetryQueue --> MainExchange: TTL到期自动死信
+
+    MainExchange --> OrdersQueue: routing_key order.retry
+
+    MaxRetryExceeded --> ErrorsExchange: sendToErrorQueue
+    ErrorsExchange --> ErrorsQueue: routing_key error
+    ErrorsQueue --> [*]: 等待人工处理
+```
+
+---
+
+## 重试计数机制
+
+```mermaid
+graph LR
+    M1[消息 首次处理] --> H1{有 headers?}
+    H1 -->|否| C0[count = 0]
+
+    C0 -->|NACK| M2[消息 第1次重试]
+    M2 --> H2{有 headers?}
+    H2 -->|是| XD2[读取 x-death]
+    XD2 --> C1[count = 1]
+
+    C1 -->|NACK| M3[消息 第2次重试]
+    M3 --> H3{有 headers?}
+    H3 -->|是| XD3[读取 x-death]
+    XD3 --> C2[count = 2]
+
+    C2 -->|NACK| M4[消息 第3次重试]
+    M4 --> H4{有 headers?}
+    H4 -->|是| XD4[读取 x-death]
+    XD4 --> C3[count = 3]
+
+    C3 --> ERROR[发送到错误队列]
+
+    style C0 fill:#90EE90
+    style C1 fill:#FFD700
+    style C2 fill:#FFA500
+    style C3 fill:#FF6B6B
+    style ERROR fill:#DC143C,color:#fff
+```
+
+---
+
+## 关键代码逻辑
+
+### 1. getRetryCount() - 获取重试次数
+
+```php
+protected function getRetryCount(AMQPMessage $message): int
+{
+    // ⚠️ 关键：首次消息没有 application_headers，必须先检查
+    if (!$message->has('application_headers')) {
+        return 0;  // 首次处理
+    }
+
+    $headers = $message->get('application_headers');
+    if (!$headers) {
+        return 0;
+    }
+
+    $headerData = $headers->getNativeData();
+    $xDeath = $headerData['x-death'] ?? [];
+
+    if (empty($xDeath)) {
+        return 0;
+    }
+
+    // RabbitMQ 自动维护的重试次数
+    return $xDeath[0]['count'] ?? 0;
+}
+```
+
+**x-death 结构示例**:
+```php
+[
+    'x-death' => [
+        0 => [
+            'count' => 2,                    // 重试次数
+            'reason' => 'rejected',          // 死信原因
+            'queue' => 'orders.queue',       // 原队列
+            'time' => 1701234567,           // 时间戳
+            'exchange' => 'dlx.orders',      // DLX 名称
+            'routing-keys' => ['retry']
+        ]
+    ]
+]
+```
+
+### 2. sendToErrorQueue() - 发送到错误队列
+
+```php
+protected function sendToErrorQueue(AMQPMessage $message, Throwable $error): void
+{
+    $originalData = json_decode($message->getBody(), true);
+
+    // 构建详细的错误消息
+    $errorMessage = [
+        'error_id' => uniqid('err_', true),
+        'original_message' => $originalData,
+        'error' => [
+            'type' => get_class($error),
+            'message' => $error->getMessage(),
+            'trace' => $error->getTraceAsString(),
+            'timestamp' => date('c'),
+        ],
+        'metadata' => [
+            'platform' => $originalData['platform'] ?? 'unknown',
+            'platform_id' => $originalData['meta']['platform_id'] ?? null,
+            'company_id' => $originalData['meta']['company_id'] ?? null,
+            'store_id' => $originalData['meta']['store_id'] ?? null,
+            'data_type' => $originalData['data_type'] ?? 'unknown',
+            'failed_at' => date('c'),
+            'retry_count' => $this->getRetryCount($message),
+        ],
+    ];
+
+    // 使用 errors.exchange 发送（不是默认 exchange）
+    $producer = ApplicationContext::getContainer()->get(Producer::class);
+    $producer->produce(
+        new class($errorMessage) extends \Hyperf\Amqp\Message\ProducerMessage {
+            protected string $exchange = 'errors.exchange';      // ✅ 通用错误交换机
+            protected string|array $routingKey = 'error';
+            protected string $poolName = 'default_consumer';
+            protected array $properties = [
+                'delivery_mode' => 2,  // 持久化
+            ];
+
+            public function __construct(array $data) {
+                $this->payload = $data;
+            }
+        }
+    );
+}
+```
+
+---
+
+## 时序图：完整的重试流程
+
+```mermaid
+sequenceDiagram
+    participant P as Producer
+    participant MQ as orders.queue
+    participant C as OrderConsumer
+    participant DLX as dlx.orders
+    participant RQ as orders.retry.queue
+    participant ME as main.exchange
+    participant EX as errors.exchange
+    participant EQ as errors.queue
+    participant DB as Database
+
+    Note over P,MQ: 1. 首次消息
+    P->>MQ: 发送订单消息
+    MQ->>C: 消费消息 (count=0)
+    C->>C: getRetryCount() → 0
+    C->>DB: 尝试保存数据
+    DB-->>C: 失败 (异常)
+    C->>C: count(0) < MAX(3)
+    C->>MQ: NACK(requeue=false)
+    MQ->>DLX: 死信到 DLX
+    Note over DLX: x-death count=1
+    DLX->>RQ: routing_key: retry
+
+    Note over RQ: 2. 第1次重试
+    RQ->>RQ: 等待 TTL 5秒
+    RQ->>ME: TTL到期，自动死信
+    ME->>MQ: routing_key: order.retry
+    MQ->>C: 消费消息 (count=1)
+    C->>C: getRetryCount() → 1
+    C->>DB: 尝试保存数据
+    DB-->>C: 失败 (异常)
+    C->>C: count(1) < MAX(3)
+    C->>MQ: NACK(requeue=false)
+    MQ->>DLX: 死信到 DLX
+    Note over DLX: x-death count=2
+    DLX->>RQ: routing_key: retry
+
+    Note over RQ: 3. 第2次重试
+    RQ->>RQ: 等待 TTL 5秒
+    RQ->>ME: TTL到期，自动死信
+    ME->>MQ: routing_key: order.retry
+    MQ->>C: 消费消息 (count=2)
+    C->>C: getRetryCount() → 2
+    C->>DB: 尝试保存数据
+    DB-->>C: 失败 (异常)
+    C->>C: count(2) < MAX(3)
+    C->>MQ: NACK(requeue=false)
+    MQ->>DLX: 死信到 DLX
+    Note over DLX: x-death count=3
+    DLX->>RQ: routing_key: retry
+
+    Note over RQ,EQ: 4. 超过重试次数
+    RQ->>RQ: 等待 TTL 5秒
+    RQ->>ME: TTL到期，自动死信
+    ME->>MQ: routing_key: order.retry
+    MQ->>C: 消费消息 (count=3)
+    C->>C: getRetryCount() → 3
+    C->>DB: 尝试保存数据
+    DB-->>C: 失败 (异常)
+    C->>C: count(3) >= MAX(3) ✓
+    C->>EX: sendToErrorQueue()
+    EX->>EQ: 消息进入错误队列
+    C->>MQ: ACK (防止再次重试)
+    Note over EQ: 等待人工处理
+```
+
+---
+
+## 配置参数
+
+### 环境变量 (.env)
+
+```bash
+# 最大重试次数（默认3次）
+AMQP_MAX_RETRIES=3
+
+# 调试延迟（秒），便于在 mq:status 中观察消息流转
+# 生产环境设置为 0，开发环境可设置为 2
+AMQP_CONSUMER_DEBUG_DELAY=0
+```
+
+### Consumer 配置
+
+```php
+#[Consumer(
+    exchange: "main.exchange",
+    routingKey: "order.#",
+    queue: "orders.queue",
+    pool: "default_consumer",
+    nums: 1,
+    enable: true
+)]
+class OrderConsumer extends ConsumerMessage
+{
+    // ⚠️ 关键：必须设置为 false，否则会无限循环重试
+    protected bool $requeue = false;
+
+    protected ?array $qos = [
+        'prefetch_size' => 0,
+        'prefetch_count' => 1,  // 开发环境建议设置为1，生产环境可设置为10-100
+        'global' => false,
+    ];
+}
+```
+
+### 队列配置 (rabbitmq.sh)
+
+**orders.queue**:
+- `x-dead-letter-exchange`: `dlx.orders` - 失败时发送到的 DLX
+- `x-dead-letter-routing-key`: `retry` - DLX 路由键
+- `x-message-ttl`: 86400000 (24小时) - 消息最长存活时间
+
+**orders.retry.queue**:
+- `x-message-ttl`: 5000 (5秒) - 重试延迟时间
+- `x-dead-letter-exchange`: `main.exchange` - TTL到期后回流的 exchange
+- `x-dead-letter-routing-key`: `order.retry` - 回流时的 routing key
+
+**errors.queue**:
+- `x-message-ttl`: 604800000 (7天) - 错误消息保留时间
+
+---
+
+## 监控和调试
+
+### 查看队列状态
+
+```bash
+php bin/hyperf.php app:mq:status
+```
+
+输出示例:
+```
+=== Business Queues ===
++-----------+---------+----------+---------+-----------+
+| Metric    | orders  | products | refunds | inventory |
++-----------+---------+----------+---------+-----------+
+| Messages  | 0       | 0        | 0       | 0         |
+| Consumers | 1       | 0        | 0       | 0         |
+| Status    | ✓ Empty | ✓ Empty  | ✓ Empty | ✓ Empty   |
++-----------+---------+----------+---------+-----------+
+
+=== Dead Letter Queues (Retry Queues) ===
++-----------+--------------+----------------+---------------+-----------------+
+| Metric    | orders.retry | products.retry | refunds.retry | inventory.retry |
++-----------+--------------+----------------+---------------+-----------------+
+| Messages  | 0            | 0              | 0             | 0               |
+| Consumers | 0            | 0              | 0             | 0               |
+| Status    | ✓ Empty      | ✓ Empty        | ✓ Empty       | ✓ Empty         |
++-----------+--------------+----------------+---------------+-----------------+
+
+=== Shared Queues ===
++-----------+----------+
+| Metric    | errors   |
++-----------+----------+
+| Messages  | 5        |
+| Consumers | 0        |
+| Status    | ✓ Active |
++-----------+----------+
+```
+
+### 开启调试模式观察流程
+
+```bash
+# 1. 设置调试延迟
+echo "AMQP_CONSUMER_DEBUG_DELAY=2" >> .env
+
+# 2. 启动消费者
+php bin/hyperf.php start
+
+# 3. 发送测试消息
+php bin/hyperf.php app:mq-push:tmall
+
+# 4. 观察日志输出
+tail -f runtime/logs/hyperf.log
+```
+
+你将看到：
+```
+>>> No application_headers, first time processing
+Retry count: 0/3
+=== Error Caught ===
+Error: Cannot find parser for platform 'tmall' and entity 'order'
+>>> Retry not exceeded, sending to DLX (NACK)
+
+[5秒后]
+>>> Extracted count from x-death: 1
+Retry count: 1/3
+>>> Retry not exceeded, sending to DLX (NACK)
+
+[5秒后]
+>>> Extracted count from x-death: 2
+Retry count: 2/3
+>>> Retry not exceeded, sending to DLX (NACK)
+
+[5秒后]
+>>> Extracted count from x-death: 3
+Retry count: 3/3
+>>> MAX RETRIES EXCEEDED! Sending to error queue...
+>>> Successfully sent to error queue!
+>>> Returning ACK to prevent further retries
+```
+
+---
+
+## 常见问题排查
+
+### 问题1: 消息无限循环，队列始终显示空
+
+**原因**: `requeue` 没有设置为 `false`
+
+**解决**:
+```php
+protected bool $requeue = false;  // ⚠️ 必须设置
+```
+
+### 问题2: OutOfBoundsException - No "application_headers"
+
+**原因**: 首次处理的消息没有 `application_headers` 属性
+
+**解决**: 使用 `has()` 检查
+```php
+if (!$message->has('application_headers')) {
+    return 0;
+}
+```
+
+### 问题3: 消息不进入错误队列
+
+**原因**:
+1. Consumer 没有 `errors.exchange` 的写权限
+2. 使用了默认 exchange (空字符串) 而非 `errors.exchange`
+
+**解决**:
+1. 确保 rabbitmq.sh 中 consumer 权限包含 `errors.exchange`
+2. 使用 `errors.exchange` 而非空 exchange:
+```php
+protected string $exchange = 'errors.exchange';  // ✅ 正确
+protected string $exchange = '';                 // ❌ 错误
+```
+
+### 问题4: 重试次数始终是 0
+
+**原因**:
+1. 重试队列没有正确配置 `x-dead-letter-routing-key`
+2. 消息没有回流到主队列
+
+**解决**: 确保 rabbitmq.sh 中重试队列配置：
+```bash
+--arguments '{"x-message-ttl":5000,"x-dead-letter-exchange":"main.exchange","x-dead-letter-routing-key":"order.retry"}'
+```
+
+---
+
+## 相关文档
+
+- [RabbitMQ.md](RabbitMQ.md) - RabbitMQ 架构和配置详解
+- [HyperfAmqp.md](HyperfAmqp.md) - Hyperf AMQP 使用指南和重试机制详解
+- [EntityParseFactory完整使用指南.md](EntityParseFactory完整使用指南.md) - 实体解析工厂使用
+
+
+
+## 注意事项
+
+EntityParse 为数据处理的核心业务，会影响后续连续聚合物化视图的结果
+
+backend/app/Platform/[Platform]/EntityParse/Order.php
+backend/app/Platform/Tmall/EntityParse/Order.php
\ No newline at end of file