记录注释、元数据和用户 ID - AWS X-Ray
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记录注释、元数据和用户 ID

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 对象记录到元数据块中。应用程序单独将游戏 ID 记录在注释中以用于筛选条件表达式

src/main/java/scorekeep/GameModel.java – 注释和元数据

import com.amazonaws.xray.AWSXRay; import com.amazonaws.xray.entities.Segment; import com.amazonaws.xray.entities.Subsegment; ... 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,应用程序将用户 IDsetUser 一起记录。用户 ID 记录在分段的单独字段中,并且不会为其编制索引以用于搜索。

src/main/java/scorekeep/MoveController.java – 用户 ID

import com.amazonaws.xray.AWSXRay; ... @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); }