OptaPlanner恢复时间表生成输出错误解问题求助

问题详情 #

我用Java Spring Boot结合OptaPlanner开发了一个包含近20条约束的时间表生成系统。初始生成时一切正常，OptaPlanner日志显示的分数与所得解完全匹配。但从停止处恢复生成时，尽管求解流程从断点继续，最终得到的解却存在大量约束不满足的情况。

项目架构与流程 #

项目分为两个微服务：

• 微服务A：负责与UI交互，维护数据库
• 微服务B：接收启动/恢复生成请求，从微服务A获取数据，使用OptaPlanner生成时间表

流程：UI发送启动、恢复、停止、获取时间表请求 → 微服务A处理请求 → 通过WebClient调用微服务B的接口触发生成 → 微服务B先从微服务A获取数据，再执行OptaPlanner求解

微服务B关键代码 #

启动/恢复求解接口 #

@PostMapping("startSolver")
public ResponseEntity<?> startSolver(@PathVariable String organizationId) {
    try {
        SolverConfig solverConfig = SolverConfig.createFromXmlResource("solver/timeTableSolverConfig.xml");
        SolverFactory<TimeTable> solverFactory = new DefaultSolverFactory<>(solverConfig);
        this.solverManager = SolverManager.create(solverFactory);
        this.solverManager.solveAndListen(TimeTableService.SINGLETON_TIME_TABLE_ID,
                id -> timeTableService.findById(id, UUID.fromString(organizationId)),
                timeTable -> timeTableService.updateModifiedLessons(timeTable, organizationId));

        return new ResponseEntity<>("Solving has successfully started", HttpStatus.OK);
    } catch(OptaPlannerException exception) {
        System.out.println("OptaPlanner exception - " + exception.getMessage());
        return utils.generateResponse(exception.getMessage(), HttpStatus.CONFLICT);
    }
}

从微服务A获取求解数据方法 #

public TimeTable findById(Long id, UUID organizationId) {
    SolverDataDTO solverDataDTO = webClient.get()
            .uri("http://localhost:8080/smart-planner/org/{organizationId}/optaplanner-solver/getSolverData",
                    organizationId)
            .retrieve()
            .onStatus(HttpStatus::isError, error -> {
                        LOGGER.error(extractExceptionMessage("findById.fetchFails", "findById()"));
                        return Mono.error(new OptaPlannerException(
                                extractExceptionMessage("findById.fetchFails", "")));
                    })
            .bodyToMono(SolverDataDTO.class)
            .block();

    TimeTable timeTable = new TimeTable();

    // 将solverDataDTO中的数据填充到TimeTable的所有列表中
    ...

    return timeTable;
}

保存求解结果到微服务A方法 #

public void updateModifiedLessons(TimeTable timeTable, String organizationId) {
    List<ScheduleSlot> slots = new ArrayList<>(timeTable.getScheduleSlotList());
    List<SolverScheduleSlotDTO> solverScheduleSlotDTOs =
            scheduleSlotConverter.convertModelsToSolverDTOs(slots);

    String executionMessage = webClient.post()
            .uri("http://localhost:8080/smart-planner/org/{organizationId}/optaplanner-solver/saveTimeTable",
                    organizationId)
            .header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
            .body(Mono.just(solverScheduleSlotDTOs), SolverScheduleSlotDTO.class)
            .retrieve()
            .onStatus(HttpStatus::isError, error -> {
                        LOGGER.error(extractExceptionMessage("saveSlots.savingFails", "updateModifiedLessons()"));
                        return Mono.error(new OptaPlannerException(
                                extractExceptionMessage("saveSlots.savingFails", "")));
                    })
            .bodyToMono(String.class)
            .block();
}

内容的提问来源于stack exchange，提问作者kitty