基于grpc从零开始搭建一个准生产分布式应用(9) - Service业务逻辑层实现

本文主要是介绍基于grpc从零开始搭建一个准生产分布式应用(9) - Service业务逻辑层实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

开始前必读：​​基于grpc从零开始搭建一个准生产分布式应用(0) - quickStart​​ 

前面章节的GRPC内基本是一个空实现，本章就实现下service业务逻辑层代码，因例子比较简单代码量也不算大，本章代码任务：1、用spring实现服务层，熟悉各注解的使用；2、实现一个VO逻辑，巩固mapStruct框架的使用。

一、工程结构

本章只涉及【base-grpc-framework-core】工程的改动，需改动的代码如下图所示：

二、创建必要的实体类

2.1、MVC层VO类

package com.zd.baseframework.core.controller.core.vo;import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.annotation.JsonNaming;
import lombok.Data;import java.time.LocalDateTime;@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)
public class SystemLogVo {private Long id;private String bizId;private Long userId;private String trackUid;private String code;private String customCode;private Integer state;@JsonFormat(pattern = "yyyy-MM-dd HH:mm", timezone = "GMT+8")private LocalDateTime ctime;@JsonFormat(pattern = "yyyy-MM-dd HH:mm", timezone = "GMT+8")private LocalDateTime utime;
}

2.2、Service层BO类

package com.zd.baseframework.core.core.systemlog.model;import lombok.Data;
import java.time.LocalDateTime;@Data
public class SystemLogBo {private Long id;private String bizId;private Long userId;private String trackUid;private String code;private String customCode;private Integer state;private LocalDateTime ctime;private LocalDateTime utime;
}

package com.zd.baseframework.core.core.systemlog.model;import lombok.Data;@Data
public class SystemLogQueryBo {private String bizId;private Long userId;private String code;}

2.3、VO和BO的专换工具类

新增代码第16~20行，转换VO和BO

/*** @Title: com.zd.baseframework.core.controller.core.translator.SystemLogTranslator* @Description http层与grpc层对象转换工具* @author liudong* @date 2022/6/15 8:52 PM*/
@Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED,nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS,imports = {MapStructMapperUtil.class},uses = BaseMapStructMapper.class)
public interface SystemLogTranslator {SystemLogTranslator INSTANCE = Mappers.getMapper(SystemLogTranslator.class);/*查询请求参数转换*/ListSystemLogRequest toGrpcQueryReqObject(SystemLogQueryRequest var);/*查询返回结果转换，这两个是一组，其中在生成源码时toQueryResultVos会调用toQueryResultVo*/SystemLogVo toQueryResultVo(SystemLogDto var);List<SystemLogVo> toQueryResultVos(List<SystemLogDto> var);
}

/*** @Title: com.zd.baseframework.core.core.systemlog.api.SystemLogDtoTranslator* @Description grpc与service层对象转换工具类* @author liudong* @date 2022/6/15 8:59 PM*/
@Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED,nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS,imports = {MapStructMapperUtil.class},uses = BaseMapStructMapper.class)
public interface SystemLogDtoTranslator {SystemLogDtoTranslator INSTANCE = Mappers.getMapper(SystemLogDtoTranslator.class);/*查询请求参数转换*/SystemLogQueryBo toQueryBo(ListSystemLogRequest var);/*返回结果转换*/SystemLogDto toQueryResultDto(SystemLogBo var);List<SystemLogDto> toQueryResultDtos(List<SystemLogBo> var);
}

三、创建Service接口和实现

3.1、接口定义

package com.zd.baseframework.core.core.systemlog.service;public interface ISystemLogServcie {boolean createSystemLog(SystemLogBo systemLogBo);List<SystemLogBo> listByCondition(SystemLogQueryBo systemLogQueryBo);
}

3.2、接口实现

package com.zd.baseframework.core.core.systemlog.service.impl;@Service
@Slf4j
@Primary
public class SystemLogServcieImpl implements ISystemLogServcie {@Overridepublic boolean createSystemLog(SystemLogBo systemLogBo) {String trackLog = LogGenerator.trackLog();log.info(trackLog+ "createSystemLog=" + JSONUtil.toJsonStr(systemLogBo));try{return null;}catch(Exception e){throw e;}}@Overridepublic List<SystemLogBo> listByCondition(SystemLogQueryBo systemLogQueryBo) {String trackLog = LogGenerator.trackLog();try{return null;}catch(Exception e){throw e;}}
}

四、建立GRPC与SERVICE调用关系

4.1、Contoller集成VO

修改com.zd.baseframework.core.controller.core.SystemLogController类的如下方法，新增第5~8行。

@PostMapping("/v1/list_systemlog")public BaseResponse listSystemLog(@RequestBody SystemLogQueryRequest systemLogRequest){try{//构建查询参数ListSystemLogRequest listSystemLogRequest  = SystemLogTranslator.INSTANCE.toGrpcQueryReqObject(systemLogRequest);ListSystemLogResponse listSystemLogResponse = iSysRecordServiceBlockingStub.listSystemLogByCondition(listSystemLogRequest);List<SystemLogVo> vos = SystemLogTranslator.INSTANCE.toQueryResultVos(listSystemLogResponse.getDataList());return BaseResponse.success(vos);}catch(StatusRuntimeException e){log.error("ErrorCode : " + e.getStatus().getCode());return BaseResponse.error(e.getMessage());}catch(Exception e){e.printStackTrace();return BaseResponse.error(e.getMessage());}}

4.2、Grpc调用Service逻辑

修改com.zd.baseframework.core.core.systemlog.api.impl.SystemLogServiceApiImpl类，完整代码如下：

@GrpcService
@Slf4j
public class SystemLogServiceApiImpl extends ISystemLogServiceGrpc.ISystemLogServiceImplBase {@Autowiredprivate ISystemLogServcie iSystemLogServcie;@Overridepublic void createSystemLog(CreateSystemLogRequest request, StreamObserver<SystemLogOperatorResponse> responseObserver)  {String bizId = request.hasBizId()?request.getBizId().getValue():null;Long userId  = request.hasUserId()?request.getUserId().getValue():null;String code = request.hasCode()?request.getCode().getValue():null;String customCode = request.hasCustomCode()?request.getCustomCode().getValue():null;String trackLog = LogGenerator.trackLog();try{//打印原始入参log.info(trackLog+ " grpcReqParam=" + JsonFormat.printer().omittingInsignificantWhitespace().print(request));//入参验证if(StrUtil.isEmpty(bizId)|| null==userId|| StrUtil.isEmpty(code) ){throw new AppException("非法参数");}SystemLogBo systemLogBo = new SystemLogBo();systemLogBo.setCode(code);systemLogBo.setCustomCode(customCode);systemLogBo.setBizId(bizId);systemLogBo.setUserId(userId);systemLogBo.setTrackUid("10000");boolean result = iSystemLogServcie.createSystemLog(systemLogBo);if(result){SystemLogOperatorResponse response  = SystemLogOperatorResponse.newBuilder().setStatus(ResponseConst.SUCCESS).setMessage(ResponseConst.Msg.SUCCESS).build();responseObserver.onNext(response);}else{log.info(trackLog+ " grpcReqParam=" + JsonFormat.printer().omittingInsignificantWhitespace().print(request)+ " result=fail" );responseObserver.onError(Status.INVALID_ARGUMENT.asException());}responseObserver.onCompleted();}catch (AppException e) {log.error(e.getMessage());responseObserver.onError(Status.INVALID_ARGUMENT.withDescription(e.getMessage()).asException());}catch(Exception e){log.error(e.getMessage());responseObserver.onError(Status.INTERNAL.withDescription(e.getMessage()).asException());}}@Overridepublic void listSystemLogByCondition(ListSystemLogRequest request, StreamObserver<ListSystemLogResponse> responseObserver) {String trackLog = LogGenerator.trackLog();try{//打印原始入参log.info(trackLog+ " grpcReqParam=" + JsonFormat.printer().omittingInsignificantWhitespace().print(request));SystemLogQueryBo systemLogQueryBo = SystemLogDtoTranslator.INSTANCE.toQueryBo(request);List<SystemLogBo> systemLogBoList = iSystemLogServcie.listByCondition(systemLogQueryBo);log.info(trackLog+ " systemLogBoListSize=" + CollUtil.size(systemLogBoList));List<SystemLogDto> dtos = SystemLogDtoTranslator.INSTANCE.toQueryResultDtos(systemLogBoList);ListSystemLogResponse response = ListSystemLogResponse.newBuilder().addAllData(dtos).build();responseObserver.onNext(response);responseObserver.onCompleted();}catch (AppException e) {log.error(e.getMessage());responseObserver.onError(Status.INVALID_ARGUMENT.withDescription(e.getMessage()).asException());}catch(Exception e){log.error(e.getMessage());responseObserver.onError(Status.INTERNAL.withDescription(e.getMessage()).asException());}}
}

这篇关于基于grpc从零开始搭建一个准生产分布式应用(9) - Service业务逻辑层实现的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---