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# 记录注释、元数据和用户 IDs
注释和元数据

**注意**  
X-Ray SDK/Daemon 维护通知 — 2026 年 2 月 25 日， Amazon X-Ray SDKs/Daemon 将进入维护模式，在该模式下，X-Ray SDK 和 Daemon 的发布 Amazon 将仅限于解决安全问题。有关支持时间表的更多信息，请参阅 [X-Ray SDK 和 Daemon Support 时间表](xray-sdk-daemon-timeline.md)。我们建议迁移到 OpenTelemetry。有关迁移到的更多信息 OpenTelemetry，请参阅[从 X-Ray 仪器迁移到 OpenTelemetry 仪器](https://docs.amazonaws.cn/xray/latest/devguide/xray-sdk-migration.html)。

在游戏模型类中，每当应用程序将游戏保存在 DynamoDB 中时，都会将 `Game` 对象记录到[元数据](xray-sdk-java-segment.md#xray-sdk-java-segment-metadata)块中。另外，该应用程序将游戏记录 IDs 在[注释](xray-sdk-java-segment.md#xray-sdk-java-segment-annotations)中，以便与[过滤器表达式](xray-console-filters.md)一起使用。

**Example [https://github.com/awslabs/eb-java-scorekeep/tree/xray/src/main/java/scorekeep/GameModel.java](https://github.com/awslabs/eb-java-scorekeep/tree/xray/src/main/java/scorekeep/GameModel.java) - 注释和元数据**  

```
import [com.amazonaws.xray.AWSXRay](https://docs.amazonaws.cn/xray-sdk-for-java/latest/javadoc/com/amazonaws/xray/AWSXRay.html);
import [com.amazonaws.xray.entities.Segment](https://docs.amazonaws.cn/xray-sdk-for-java/latest/javadoc/com/amazonaws/xray/entities/Segment.html);
import [com.amazonaws.xray.entities.Subsegment](https://docs.amazonaws.cn/xray-sdk-for-java/latest/javadoc/com/amazonaws/xray/entities/Subsegment.html);
...
  public void saveGame(Game game) throws SessionNotFoundException {
    // wrap in subsegment
    Subsegment subsegment = AWSXRay.beginSubsegment("## GameModel.saveGame");
    try {
      // check session
      String sessionId = game.getSession();
      if (sessionModel.loadSession(sessionId) == null ) {
        throw new SessionNotFoundException(sessionId);
      }
      Segment segment = AWSXRay.getCurrentSegment();
      subsegment.putMetadata("resources", "game", game);
      segment.putAnnotation("gameid", game.getId());
      mapper.save(game);
    } catch (Exception e) {
      subsegment.addException(e);
      throw e;
    } finally {
      AWSXRay.endSubsegment();
    }
  }
```

在移动控制器中，应用程序[ IDs使用记录用户](xray-sdk-java-segment.md#xray-sdk-java-segment-userid)`setUser`。用户 IDs被记录在区段的单独字段中，并编制索引以供搜索使用。

**Example [src/main/java/scorekeep/MoveController.java](https://github.com/awslabs/eb-java-scorekeep/tree/xray/src/main/java/scorekeep/MoveController.java) — 用户 ID**  

```
import [com.amazonaws.xray.AWSXRay](https://docs.amazonaws.cn/xray-sdk-for-java/latest/javadoc/com/amazonaws/xray/AWSXRay.html);
...
  @RequestMapping(value="/{userId}", method=RequestMethod.POST)
  public Move newMove(@PathVariable String sessionId, @PathVariable String gameId, @PathVariable String userId, @RequestBody String move) throws SessionNotFoundException, GameNotFoundException, StateNotFoundException, RulesException {
    AWSXRay.getCurrentSegment().setUser(userId);
    return moveFactory.newMove(sessionId, gameId, userId, move);
  }
```