# CLAUDE.md — system-admin

Backend module: Spring Boot 3.5 admin application (port 8080, context `/system-admin`).

---

## Build & Run

```bash
mvn clean install -DskipTests           # full build (tests skipped by default)
mvn clean install -DskipTests=false     # build with tests
mvn -pl system-admin -DskipTests=false -Dtest=YourTestClass test  # single test
```

Tests use **JUnit 4** (`@RunWith(SpringRunner.class)`), not JUnit 5. Only 2 test files exist (Redis, dynamic datasource). No Maven wrapper (`mvnw`). Maven remote repository: Aliyun mirror.

Launch from IntelliJ:
- `AdminApplication` (`system-admin/`) → port 8080, context `/system-admin`
- `GeneratorApplication` (`renren-generator/`) — commented out of build

## Service layer pattern

Two base classes in `system-common`:

| Base | Purpose |
|---|---|
| `CrudService<Dao, Entity, DTO>` | Generic CRUD: `page()`, `get()`, `save()`, `update()`, `delete()` |
| `BaseService<Dao>` | Lighter base without DTO generic |

Module convention:
```
modules/<name>/
├── controller/  → @RestController, returns Result
├── dao/         → extends BaseMapper<Entity> (MyBatis-Plus)
├── dto/         → request/query DTOs (often extends BaseEntity)
├── entity/      → @TableName JPA entity
├── service/     → interface extends CrudService/BaseService
│   └── impl/    → @Service implementation
├── excel/       → EasyExcel VO classes (optional)
└── vo/          → response VO classes (optional)
```

Mapper XMLs: `src/main/resources/mapper/<domain>/**/*.xml`

### Conventions

- Lombok used throughout: `@Data`, `@AllArgsConstructor`, `@Slf4j` are standard on entity/service classes.
- DTO/Entity/VO separation per module — request DTOs often extend `BaseEntity`.

## PK & Auth

- PK: `ASSIGN_ID` (Snowflake) via `IdUtil.getSnowflakeNextId()`. All entities extend `BaseEntity`. Exception: `WeatherStationEntity` uses `AUTO_INCREMENT`.
- Auth: Apache Shiro 1.12 (**Jakarta classifier**) + OAuth2 token. Login → `token` header.
- **Do not introduce Spring Security** — the project uses Shiro exclusively.

## Key cross-cutting mechanisms

| Mechanism | How |
|---|---|
| **Data permissions** | `@DataFilter` on controller → `DataFilterAspect` → MyBatis interceptor injects dept-based SQL |
| **Auto-fill** | `FieldMetaObjectHandler` fills creator/date via MyBatis-Plus. **Only works with `insert()`/`updateById()`** — batch inserts (e.g. `insertBatchMultiRow`) bypass auto-fill; fields must be set manually. |
| **Scheduled jobs** | Quartz. `schedule_job` table, implements `ITask`, `@Component("beanName")`. Jobs auto-register at startup via `JobCommandLineRunner`. Seed data: `testTask` (paused, every 30 min), `fileScanTask` (paused, every 5 min), `weatherSummarizeCacheTask` (**active**, daily 1 AM). |
| **File scanning** | `WatchService` (primary, background thread) + Quartz fallback (`FileScanTask`) + startup runner (`FileScanStartupRunner`). Files identified by MD5 hash. |
| **Excel import** | EasyExcel + async dual-pass via `WeatherDataImportManager`. Progress tracked in-memory (`ConcurrentHashMap`), lost on restart. |
| **API responses** | Always wrapped in `Result`. Frontend expects `code === 0` for success. |
| **Validation** | Hibernate Validator. XSS filter via `XssFilter`. i18n messages in `system-common/src/main/resources/i18n/validation.properties`. |

## Exception handling

Single `@RestControllerAdvice` handler in the admin module:

| Handler | Catches | Persists errors? |
|---|---|---|
| `CustomExceptionHandler` | `CommonException`, `DuplicateKeyException`, `UnauthorizedException`, generic `Exception` | **Yes** — saves to `SysLogErrorService` (IP, user-agent, URI, params, stack trace) |

Both return a generic error for caught `Exception` (not the exception message). `CommonException` uses i18n message lookup via `MessageUtils.getMessage(code)`. Error codes follow `int` scheme: 5 digits, first 2 = module, last 3 = business (e.g. `10001`-`10029`).

## Logging

- Logback-spring config in `system-admin/src/main/resources/logback-spring.xml`. Logger names use `io.renren` (fork legacy), **not** `com.weather`.
- Admin dev profile enables MyBatis SQL stdout logging (`StdOutImpl`).
- When adding `@Slf4j` to `com.weather.*` classes, add a `com.weather` level override or change the existing `io.renren` logger scope.

## Redis & Docs

- Redis: `project-options.redis.open: true` in dev YAML controls whether `RedisAspect` intercepts Redis calls (default `false` — Redis operations silently skipped when disabled).
- Knife4j: disabled by default (`knife4j.enable: false`). Docs at `/doc.html` when enabled.
- `RedisAspect` wraps `@RedisCache` annotations with channel publish for cache invalidation.

## MyBatis-Plus gotchas

- **Batch inserts bypass auto-fill** — `FieldMetaObjectHandler` only fires on `insert()`/`updateById()`. Custom batch methods must manually set `creator`, `createDate`, `updater`, `updateDate`, `deptId`.
- Column names with special characters (e.g. `rain_20_20`) require explicit `@TableField` annotations — MyBatis-Plus cannot auto-map them from camelCase.
- `typeAliasesPackage: com.weather.modules.*.entity` — all entity classes must reside under a `modules` sub-package.

## Weather domain

Three sub-modules under `system-admin/.../modules/weather/`:

| Module | Purpose |
|---|---|
| `dailydata/` | Daily observations, Excel batch import (async dual-pass), EasyExcel listener, summary export |
| `station/` | Weather station CRUD, linked to dept via `dept_id` |
| `filescan/` | File monitoring + serving. Format: `<地区>地区-<指标>.png` / `<地区>地区631信息.txt` |

### Weather data import flow

1. **First pass**: `AnalysisEventListener` counts total rows.
2. **Second pass**: `WeatherDataListener` processes with batch insert (2000 records/batch).
3. Progress tracked in-memory via `ConcurrentHashMap<String, ImportProgress>` (`volatile` fields + `AtomicInteger`).
4. Runs on `CompletableFuture` with manual `UserContextHolder` propagation for security context. (Note: `UserContextHolder` is in `system-admin/.../security/user/`, not the empty `system-common/.../holder/` package.)
5. On completion, clears Redis summary cache (`weather:summarize:*`).

### Weather summarize cache

`WeatherSummarizeCacheTask` (Quartz job) pre-computes daily historical summaries into Redis. Uses **MySQL-specific** SQL functions (`MONTH()`, `DAY()` on `observe_date`). Cache key: `weather:summarize:{month}:{day}`, non-expiring. Service checks cache first for queries spanning same month/day across years.

### Station priority ordering

`WeatherDailyDataServiceImpl.page()` uses custom `CASE WHEN` SQL to order stations belonging to the user's department + sub-departments first.

## System alert module

CRUD + polling notification system under `modules/sys/`:

| Layer | File |
|---|---|
| Entity | `entity/SysAlertEntity.java` — `sys_alert` table, Snowflake PK |
| DAO | `dao/SysAlertDao.java` + `mapper/sys/SysAlertDao.xml` — `selectActiveAlerts`, `selectActiveAlertsSince`, `countBySource` |
| DTO | `dto/SysAlertDTO.java` — `publishTime`/`createDate`/`updateDate` read-only |
| VO | `vo/SysAlertVO.java` — `id` as String (mapped from Long) |
| Service | `service/SysAlertService.java` + `impl/` — `publishIfNotExists` (dedup by source), `withdraw` (soft), CRUD |
| Controller | `controller/SysAlertController.java` — polling: `GET active`, `GET active/since` (no auth); CRUD: `page`/`get`/`save`/`update`/`delete`/`withdraw` (Shiro permissions) |
| Enums | `enums/AlertLevelEnum.java` (info/warning/danger), `enums/AlertSourceTypeEnum.java` (manual/import/schedule/datasource) |

### Data source extension

| File | Role |
|---|---|
| `alert/AlertSource.java` | SPI interface: `getName()`, `check()` returning `AlertMessage` records |
| `alert/AlertSourceCollector.java` | `@Autowired(required=false) List<AlertSource>` auto-discovery, calls `publishIfNotExists` for each |
| `alert/task/AlertSourcePollingTask.java` | Quartz job (`alertSourcePollingTask`), default paused in `schedule_job` |

To add a new alert source: implement `AlertSource`, register as `@Component`, enable the polling task.