微服务的初始化

在service在服务下，创建商品微服务goods-service

启动类

/**  * 
启动商品微服务入口
  * 启动依赖组件/中间件： Redis   MySQL   Nacos   Kafka   Zipkin  * http://127.0.0.1:8001/ecommerce-goods-service/doc.html  */  @EnableJpaAuditing @EnableDiscoveryClient @SpringCloudApplication public class GoodsApplication {     public static void main(String[] args) {         SpringApplication.run(GoodsApplication.class, args);     } } 

pom

               e-commerce-service         com.taluohui.ecommerce         1.0-SNAPSHOT          4.0.0      e-commerce-goods-service     1.0-SNAPSHOT     jar           e-commerce-goods-service     商品服务                                     com.alibaba.cloud             spring-cloud-starter-alibaba-nacos-discovery                                        org.springframework.cloud             spring-cloud-starter-zipkin                               org.springframework.kafka             spring-kafka             2.5.0.RELEASE                                        org.springframework.boot             spring-boot-starter-data-redis                                        org.springframework.boot             spring-boot-starter-data-jpa                                        mysql             mysql-connector-java             8.0.12             runtime                                        org.springframework.boot             spring-boot-starter-aop                               com.taluohui.ecommerce             e-commerce-service-config             1.0-SNAPSHOT                               com.taluohui.ecommerce             e-commerce-service-sdk             1.0-SNAPSHOT                                  ${artifactId}                                       org.springframework.boot                 spring-boot-maven-plugin                                                                                            repackage                                                                                            

配置项

server:   port: 8001   servlet:     context-path: /ecommerce-goods-service  spring:   application:     name: e-commerce-goods-service # 也构成了应用名称 Nacos 配置管理 dataId 部分字段 (当 config.prefix 为空时)   cloud:     nacos:       # 发现服务注册       discovery:         enabled: rue # 如果不想使用 Nacos 进行服务注册和发现, 设置为 false 即可
        server-addr: 127.0.0.1:8848
        # server-addr: 127.0.0.1:8848,127.0.0.1:8849,127.0.0.1:8850 # Nacos 服务器地址
        namespace: 22d40198-8462-499d-a7fe-dbb2da958648
        metadata:
          management:
            context-path: ${server.servlet.context-path}/actuator
  kafka:
    bootstrap-servers: 1.15.247.9:9092
    producer:
      retries: 3
    consumer:
      auto-offset-reset: latest
  sleuth:
    sampler:
      # ProbabilityBasedSampler 抽样策略
      probability: 1.0  # 采样比例, 1.0 表示 100%, 默认是 0.1
      # RateLimitingSampler 抽样策略, 设置了限速采集, spring.sleuth.sampler.probability 属性值无效
      rate: 100  # 每秒间隔接受的 trace 量
  zipkin:
    sender:
      type: kafka # 默认是 web
    base-url: http://127.0.0.1:9411/
  jpa:
    show-sql: true
    hibernate:
      ddl-auto: none
    properties:
      hibernate.show_sql: true
      hibernate.format_sql: true
    open-in-view: false
  datasource:
    # 数据源
    url: jdbc:mysql://127.0.0.1:3306/ecommerce?autoReconnect=true&useUnicode=true&characterEncoding=utf8&useSSL=false
    username: root
    password: Cjw970404
    type: com.zaxxer.hikari.HikariDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    # 连接池
    hikari:
      maximum-pool-size: 8
      minimum-idle: 4
      idle-timeout: 30000
      connection-timeout: 30000
      max-lifetime: 45000
      auto-commit: true
      pool-name: ImoocEcommerceHikariCP

# 暴露端点
management:
  endpoints:
    web:
      exposure:
        include: '*'
  endpoint:
    health:
      show-details: always

枚举类和转换方法

枚举类示例，在文件夹constant下

/**
 * 
品牌分类
 * */
@Getter
@AllArgsConstructor
public enum BrandCategory {
    BRAND_A("20001", "品牌A"),
    BRAND_B("20002", "品牌B"),
    BRAND_C("20003", "品牌C"),
    BRAND_D("20004", "品牌D"),
    BRAND_E("20005", "品牌E"),
    ;

    /** 品牌分类编码 */
    private final String code;

    /** 品牌分类描述信息 */
    private final String description;

    /**
     * 
根据 code 获取到 BrandCategory
     * */
    public static BrandCategory of(String code) {

        Objects.requireNonNull(code);

        return Stream.of(values())
                .filter(bean -> bean.code.equals(code))
                .findAny()
                .orElseThrow(
                        () -> new IllegalArgumentException(code + " not exists")
                );
    }
}

转换方法，在文件夹converter下

/**
 * 
品牌分类枚举属性转换器
 * */
public class BrandCategoryConverter implements AttributeConverter {
    @Override
    public String convertToDatabaseColumn(BrandCategory brandCategory) {
        return brandCategory.getCode();
    }

    @Override
    public BrandCategory convertToEntityAttribute(String code) {
        return BrandCategory.of(code);
    }
}

再用以下方法创建两个枚举类和他们的转换方法

/**
 * 
商品类别
 * 电器 -> 手机、电脑
 * */
public enum GoodsCategory {
    DIAN_QI("10001", "电器"),
    JIA_JU("10002", "家具"),
    FU_SHI("10003", "服饰"),
    MY_YIN("10004", "母婴"),
    SHI_PIN("10005", "食品"),
    TU_SHU("10006", "图书"),
    ;
·······································
}

/**
 *
商品状态枚举类
 */
@Getter
@AllArgsConstructor
public enum GoodsStatus {
    ONLINE(101, "上线"),
    OFFLINE(102, "下线"),
    STOCK_OUT(103, "缺货"),
    ;
·····································
}

在mysql中创建商品表

-- 创建 t_ecommerce_goods 数据表
CREATE TABLE IF NOT EXISTS `ecommerce`.`t_ecommerce_goods` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '自增主键',
  `goods_category` varchar(64) NOT NULL DEFAULT '' COMMENT '商品类别',
  `brand_category` varchar(64) NOT NULL DEFAULT '' COMMENT '品牌分类',
  `goods_name` varchar(64) NOT NULL DEFAULT '' COMMENT '商品名称',
  `goods_pic` varchar(256) NOT NULL DEFAULT '' COMMENT '商品图片',
  `goods_description` varchar(512) NOT NULL DEFAULT '' COMMENT '商品描述信息',
  `goods_status` int(11) NOT NULL DEFAULT 0 COMMENT '商品状态',
  `price` int(11) NOT NULL DEFAULT 0 COMMENT '商品价格',
  `supply` bigint(20) NOT NULL DEFAULT 0 COMMENT '总供应量',
  `inventory` bigint(20) NOT NULL DEFAULT 0 COMMENT '库存',
  `goods_property` varchar(1024) NOT NULL DEFAULT '' COMMENT '商品属性',
  `create_time` datetime NOT NULL DEFAULT '0000-01-01 00:00:00' COMMENT '创建时间',
  `update_time` datetime NOT NULL DEFAULT '0000-01-01 00:00:00' COMMENT '更新时间',
  PRIMARY KEY (`id`),
  UNIQUE KEY `goods_category_brand_name` (`goods_category`, `brand_category`, `goods_name`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8 COMMENT='商品表';

在entity文件下，创建对应的类以及对应的转换方法，在vo文件夹下创建对应的展示类。在sdk通用模块下创建对应的通用类。

Dao

public interface EcommerceGoodsDao extends PagingAndSortingRepository {

    /**
     * 
根据查询条件查询商品表, 并限制返回结果
     * select * from t_ecommerce_goods where goods_category = ? and brand_category = ?
     * and goods_name = ? limit 1;
     * */
    Optional findFirst1ByGoodsCategoryAndBrandCategoryAndGoodsName(
            GoodsCategory goodsCategory, BrandCategory brandCategory,
            String goodsName
    );
}

Service接口

/**
 * 
商品微服务相关服务接口定义
 * */
public interface IGoodsService {

    /**
     * 
根据 TableId 查询商品详细信息
     * */
    List getGoodsInfoByTableId(TableId tableId);

    /**
     * 
获取分页的商品信息
     * */
    PageSimpleGoodsInfo getSimpleGoodsInfoByPage(int page);

    /**
     * 
根据 TableId 查询简单商品信息
     * */
    List getSimpleGoodsInfoByTableId(TableId tableId);

    /**
     * 
扣减商品库存
     * */
    Boolean deductGoodsInventory(List deductGoodsInventories);
}

使用异步的方式进行入库操作

异步类，在service文件夹下再创建async文件夹

/**
 * 
异步服务接口定义
 */
public interface IAsyncService {

    /**
     * 
异步将商品信息保存下来
     * */
    void asyncImportGoods(List goodsInfos, String taskId);
}

在vo文件夹下，创建用于异步管理的类

/**
 * 
异步任务执行信息
 * */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class AsyncTaskInfo {

    /** 异步任务 id */
    private String taskId;

    /** 异步任务开始时间 */
    private Date startTime;

    /** 异步任务结束时间 */
    private Date endTime;

    /** 异步任务总耗时 */
    private String totalTime;
}

在商品微服务下创建config文件夹，自定义异步任务线程池，异步任务异常捕获处理器

import org.apache.commons.lang3.time.StopWatch;

/**
 * 
自定义异步任务线程池，异步任务异常捕获处理器 
 */
@Slf4j
@EnableAsync     //开启Spring异步任务支持
@Configuration
public class AsyncPoolConfig implements AsyncConfigurer {

    /**
     * 
将自定义的线程池注入到 Spring 容器中
     * */
    @Bean
    @Override
    public Executor getAsyncExecutor() {

        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();

        executor.setCorePoolSize(10);
        executor.setMaxPoolSize(20);
        executor.setQueueCapacity(20);
        executor.setKeepAliveSeconds(60);
        executor.setThreadNamePrefix("Qinyi-Async-");   // 这个非常重要

        // 等待所有任务结果候再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        executor.setAwaitTerminationSeconds(60);
        // 定义拒绝策略
        executor.setRejectedExecutionHandler(
                new ThreadPoolExecutor.CallerRunsPolicy()
        );
        // 初始化线程池, 初始化 core 线程
        executor.initialize();
        return executor;
    }

    /**
     * 
指定系统中的异步任务在出现异常时使用到的处理器
     * */
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new AsyncExceptionHandler();
    }

    /**
     * 
异步任务异常捕获处理器
     * */
    @SuppressWarnings("all")
    class AsyncExceptionHandler implements AsyncUncaughtExceptionHandler {

        @Override
        public void handleUncaughtException(Throwable throwable, Method method,
                                            Object... objects) {

            throwable.printStackTrace();
            log.error("Async Error: [{}], Method: [{}], Param: [{}]",
                    throwable.getMessage(), method.getName(),
                    JSON.toJSONString(objects));

            // TODO 发送邮件或者是短信, 做进一步的报警处理
        }
    }
}

异步任务的实现，商品信息会同步到redis中

/**
 * 
异步服务接口实现
 * */
@Slf4j
@Service
@Transactional(rollbackFor = Exception.class)
public class AsyncServiceImpl implements IAsyncService {

    private final EcommerceGoodsDao ecommerceGoodsDao;
    private final StringRedisTemplate redisTemplate;

    public AsyncServiceImpl(EcommerceGoodsDao ecommerceGoodsDao,
                            StringRedisTemplate redisTemplate) {
        this.ecommerceGoodsDao = ecommerceGoodsDao;
        this.redisTemplate = redisTemplate;
    }

    /**
     * 
异步任务需要加上注解, 并指定使用的线程池
     * 异步任务处理两件事:
     *  1. 将商品信息保存到数据表
     *  2. 更新商品缓存
     * */
    @Async("getAsyncExecutor")
    @Override
    public void asyncImportGoods(List goodsInfos, String taskId) {
        log.info("async task running taskId: [{}]", taskId);

        StopWatch watch = StopWatch.createStarted();

        // 1. 如果是 goodsInfo 中存在重复的商品, 不保存; 直接返回, 记录错误日志
        // 请求数据是否合法的标记
        boolean isIllegal = false;

        // 将商品信息字段 joint 在一起, 用来判断是否存在重复
        Set goodsJointInfos = new HashSet<>(goodsInfos.size());
        // 过滤出来的, 可以入库的商品信息(规则按照自己的业务需求自定义即可)
        List filteredGoodsInfo = new ArrayList<>(goodsInfos.size());

        // 走一遍循环, 过滤非法参数与判定当前请求是否合法
        for (GoodsInfo goods : goodsInfos) {

            // 基本条件不满足的, 直接过滤器
            if (goods.getPrice() <= 0 || goods.getSupply() <= 0) {
                log.info("goods info is invalid: [{}]", JSON.toJSONString(goods));
                continue;
            }

            // 组合商品信息
            String jointInfo = String.format(
                    "%s,%s,%s",
                    goods.getGoodsCategory(), goods.getBrandCategory(),
                    goods.getGoodsName()
            );
            if (goodsJointInfos.contains(jointInfo)) {
                isIllegal = true;
            }

            // 加入到两个容器中
            goodsJointInfos.add(jointInfo);
            filteredGoodsInfo.add(goods);
        }

        // 如果存在重复商品或者是没有需要入库的商品, 直接打印日志返回
        if (isIllegal || CollectionUtils.isEmpty(filteredGoodsInfo)) {
            watch.stop();
            log.warn("import nothing: [{}]", JSON.toJSONString(filteredGoodsInfo));
            log.info("check and import goods done: [{}ms]",
                    watch.getTime(TimeUnit.MILLISECONDS));
            return;
        }

        List ecommerceGoods = filteredGoodsInfo.stream()
                .map(EcommerceGoods::to)
                .collect(Collectors.toList());
        List targetGoods = new ArrayList<>(ecommerceGoods.size());

        // 2. 保存 goodsInfo 之前先判断下是否存在重复商品
        ecommerceGoods.forEach(g -> {

            // limit 1
            if (null != ecommerceGoodsDao
                    .findFirst1ByGoodsCategoryAndBrandCategoryAndGoodsName(
                            g.getGoodsCategory(), g.getBrandCategory(),
                            g.getGoodsName()
                    ).orElse(null)) {
                return;
            }

            targetGoods.add(g);
        });

        // 商品信息入库
        List savedGoods = IterableUtils.toList(
                ecommerceGoodsDao.saveAll(targetGoods)
        );
        // 将入库商品信息同步到 Redis 中
        saveNewGoodsInfoToRedis(savedGoods);

        log.info("save goods info to db and redis: [{}]", savedGoods.size());

        watch.stop();
        log.info("check and import goods success: [{}ms]",
                watch.getTime(TimeUnit.MILLISECONDS));
    }


    /**
     * 
将保存到数据表中的数据缓存到 Redis 中
     * dict: key -> 
     * */
    private void saveNewGoodsInfoToRedis(List savedGoods) {

        // 由于 Redis 是内存存储, 只存储简单商品信息
        List simpleGoodsInfos = savedGoods.stream()
                .map(EcommerceGoods::toSimple)
                .collect(Collectors.toList());

        Map id2JsonObject = new HashMap<>(simpleGoodsInfos.size());
        simpleGoodsInfos.forEach(
                g -> id2JsonObject.put(g.getId().toString(), JSON.toJSONString(g))
        );

        // 保存到 Redis 中
        redisTemplate.opsForHash().putAll(
                GoodsConstant.ECOMMERCE_GOODS_DICT_KEY,
                id2JsonObject
        );
    }
}

redis的Key值，定义到常量中

/**
 * 
商品常量信息
 * */
public class GoodsConstant {

    /** redis key */
    public static final String ECOMMERCE_GOODS_DICT_KEY =
            "ecommerce:goods:dict:20220308";
}

异步任务的管理

定义枚举类

/**
 * 
异步任务状态枚举
 * */
@Getter
@AllArgsConstructor
public enum AsyncTaskStatusEnum {

    STARTED(0, "已经启动"),
    RUNNING(1, "正在运行"),
    SUCCESS(2, "执行成功"),
    FAILED(3, "执行失败"),
    ;

    /** 执行状态编码 */
    private final int state;

    /** 执行状态描述 */
    private final String stateInfo;
}

异步任务执行管理器

我们并不直接调用service中的方法，通过多方法的包装，我们可以实现对任务的监控。

/**
 * 
异步任务执行管理器
 * 对异步任务进行包装管理, 记录并塞入异步任务执行信息
 * */
@Slf4j
@Component
public class AsyncTaskManager {
    /** 异步任务执行信息容器，这里作为演示，使用的map，可以使用mysql之类的做持久化 */
    private final Map taskContainer =
            new HashMap<>(16);

    private final IAsyncService asyncService;

    public AsyncTaskManager(IAsyncService asyncService) {
        this.asyncService = asyncService;
    }

    /**
     * 
初始化异步任务
     * */
    public AsyncTaskInfo initTask() {

        AsyncTaskInfo taskInfo = new AsyncTaskInfo();
        // 设置一个唯一的异步任务 id, 只要唯一即可
        taskInfo.setTaskId(UUID.randomUUID().toString());
        taskInfo.setStatus(AsyncTaskStatusEnum.STARTED);
        taskInfo.setStartTime(new Date());

        // 初始化的时候就要把异步任务执行信息放入到存储容器中
        taskContainer.put(taskInfo.getTaskId(), taskInfo);
        return taskInfo;
    }

    /**
     * 
提交异步任务
     * */
    public AsyncTaskInfo submit(List goodsInfos) {

        // 初始化一个异步任务的监控信息
        AsyncTaskInfo taskInfo = initTask();
        asyncService.asyncImportGoods(goodsInfos, taskInfo.getTaskId());
        return taskInfo;
    }

    /**
     * 
设置异步任务执行状态信息
     * */
    public void setTaskInfo(AsyncTaskInfo taskInfo) {
        taskContainer.put(taskInfo.getTaskId(), taskInfo);
    }

    /**
     * 
获取异步任务执行状态信息
     * */
    public AsyncTaskInfo getTaskInfo(String taskId) {
        return taskContainer.get(taskId);
    }
}

使用AOP实现对异步任务的监控，以及状态的修改

/**
 * 
异步任务执行监控切面
 * */
@Slf4j
@Aspect
@Component
public class AsyncTaskMonitor {
    /** 注入异步任务管理器 */
    private final AsyncTaskManager asyncTaskManager;

    public AsyncTaskMonitor(AsyncTaskManager asyncTaskManager) {
        this.asyncTaskManager = asyncTaskManager;
    }

    /**
     * 
异步任务执行的环绕切面
     * 环绕切面让我们可以在方法执行之前和执行之后做一些 "额外" 的操作
     * */
    @Around("execution(* com.taluohui.ecommerce.service.async.AsyncServiceImpl.*(..))")
    public Object taskHandle(ProceedingJoinPoint proceedingJoinPoint) {

        // 获取 taskId, 调用异步任务传入的第二个参数
        String taskId = proceedingJoinPoint.getArgs()[1].toString();

        // 获取任务信息, 在提交任务的时候就已经放入到容器中了
        AsyncTaskInfo taskInfo = asyncTaskManager.getTaskInfo(taskId);
        log.info("AsyncTaskMonitor is monitoring async task: [{}]", taskId);

        taskInfo.setStatus(AsyncTaskStatusEnum.RUNNING);
        asyncTaskManager.setTaskInfo(taskInfo); // 设置为运行状态, 并重新放入容器

        AsyncTaskStatusEnum status;
        Object result;

        try {
            // 执行异步任务
            result = proceedingJoinPoint.proceed();
            status = AsyncTaskStatusEnum.SUCCESS;
        } catch (Throwable ex) {
            // 异步任务出现了异常
            result = null;
            status = AsyncTaskStatusEnum.FAILED;
            log.error("AsyncTaskMonitor: async task [{}] is failed, Error Info: [{}]",
                    taskId, ex.getMessage(), ex);
        }

        // 设置异步任务其他的信息, 再次重新放入到容器中
        taskInfo.setEndTime(new Date());
        taskInfo.setStatus(status);
        taskInfo.setTotalTime(String.valueOf(
                taskInfo.getEndTime().getTime() - taskInfo.getStartTime().getTime()
        ));
        asyncTaskManager.setTaskInfo(taskInfo);

        return result;
    }
}

异步服务对外接口接口

/**
 * 
异步任务服务对外提供的 API
 * */
@Api(tags = "商品异步入库服务")
@Slf4j
@RestController
@RequestMapping("/async-goods")
public class AsyncGoodsController {
    private final AsyncTaskManager asyncTaskManager;

    public AsyncGoodsController(AsyncTaskManager asyncTaskManager) {
        this.asyncTaskManager = asyncTaskManager;
    }

    @ApiOperation(value = "导入商品", notes = "导入商品进入到商品表", httpMethod = "POST")
    @PostMapping("/import-goods")
    public AsyncTaskInfo importGoods(@RequestBody List goodsInfos) {
        return asyncTaskManager.submit(goodsInfos);
    }

    @ApiOperation(value = "查询状态", notes = "查询异步任务的执行状态", httpMethod = "GET")
    @GetMapping("/task-info")
    public AsyncTaskInfo getTaskInfo(@RequestParam String taskId) {
        return asyncTaskManager.getTaskInfo(taskId);
    }
}

创建Http文件，验证接口的可用性

###导入商品
POST http://localhost:9001/shuai/ecommerce-goods-service/async-goods/import-goods
Content-Type: application/json
e-commerce-user: eyJhbGciOiJSUzI1NiJ9.eyJlLWNvbW1lcmNlLXVzZXIiOiJ7XCJpZFwiOjEwLFwidXNlcm5hbWVcIjpcInNodWFpemhhbGVcIn0iLCJqdGkiOiIzNjcxM2Y5NC03YjE2LTRkOTUtOTlkOS1lMzU0NWNhNGIwMGQiLCJleHAiOjE2NDc1MzI4MDB9.HuNiwCyukpsfRoWnvQMeYmOsBqOuCFZOFhd6p8M3dx-mc12uWT5Jv6LnyMN0hpewqHre5uST4gBumlNMmN53z0jARcSJPZvYYxnrL5XnIS5iTzAat_ZFwkc0T_t7aBjMBmjcAjbjBT-xaSB7jBKSKZIfCwBE5ZL4UYqsXF39BE6SwEgLgSpakCVPG_AFj8sCW2jIVjuM4uVOqa0LwOJtTIaOnsNu2VQjYdw3Lp08Dkg8O-DQ91h5IIg1M-OL8u2mxGcxam9zAKLTZH-m4_e9nRBHKIyM3GUiQTWMAnSa93q6201lvAxd1ItWGDDjHaP6L5AuwDVHDuQXOI_ArDq5KQ

[
{
  "goodsCategory":  "10001",
  "brandCategory":  "20001",
  "goodsName": "iphone 11",
  "goodsPic": "",
  "goodsDescription": "苹果手机",
  "price": 10000,
  "supply": 200000,
  "goodsProperty": {
    "size": "12cm * 6.5cm",
    "color": "绿色",
    "material": "金属机身",
    "pattern": "纯色"
  }
}
]

### 查询导入商品状态
GET http://127.0.0.1:9001/shuai/ecommerce-goods-service/async-goods/task-info?taskId=f5c1c6ff-4efb-45e5-a8c9-9f3d4515228a
Accept: application/json
e-commerce-user: eyJhbGciOiJSUzI1NiJ9.eyJlLWNvbW1lcmNlLXVzZXIiOiJ7XCJpZFwiOjEwLFwidXNlcm5hbWVcIjpcIlFpbnlpQGltb29jLmNvbVwifSIsImp0aSI6IjAyYTRiZDcxLWUyMTgtNGZmYS1hYzQ3LWE5MGQxNWIzYmEwYSIsImV4cCI6MTYyNDgwOTYwMH0.UWbvqkIq5b5bb-WomLziZyCmjqCqsdeU1EZ0TfWrloRoY7WwqmYGDsf2GnE7JBgVLM0DibhSkkrkXu-wdjzWnqtxLkQ5UgON9BdPm1ZYLvllLcbAMv8KAdbXiC1_FiZ9q1tM6vGXlKU4-G1t88cUUP1_xXOGY9PvC5yGr31lQXCc0Nni4Ds4WwDPHvOq9YBVILdaWYeFsxIWi0pTGwcAxaCkp3BdsvPkJ3uXmrmzuLgkorkfITsmJqdaBuiSCD74LK0F-CvvCv09qizij627O3RuTrpbBfdFjDXT5xyRcKXxAR-n6oFGZdG-JUqh3iXWv_JdsyW-d8wPk3-DZ5zufA

商品普通接口的编写

/**
 * 
商品微服务相关服务功能实现
 * */
@Slf4j
@Service
@Transactional(rollbackFor = Exception.class)
public class GoodsServiceImpl implements IGoodsService {

    private final StringRedisTemplate redisTemplate;
    private final EcommerceGoodsDao ecommerceGoodsDao;

    public GoodsServiceImpl(StringRedisTemplate redisTemplate,
                            EcommerceGoodsDao ecommerceGoodsDao) {
        this.redisTemplate = redisTemplate;
        this.ecommerceGoodsDao = ecommerceGoodsDao;
    }

    @Override
    public List getGoodsInfoByTableId(TableId tableId) {
        // 详细的商品信息, 不能从 redis cache 中去拿
        List ids = tableId.getIds().stream()
                .map(TableId.Id::getId)
                .collect(Collectors.toList());
        log.info("get goods info by ids: [{}]", JSON.toJSONString(ids));

        List ecommerceGoods = IterableUtils.toList(
                ecommerceGoodsDao.findAllById(ids)
        );

        return ecommerceGoods.stream()
                .map(EcommerceGoods::toGoodsInfo).collect(Collectors.toList());
    }

    @Override
    public PageSimpleGoodsInfo getSimpleGoodsInfoByPage(int page) {
        // 分页不能从 redis cache 中去拿
        if (page <= 1) {
            page = 1;   // 默认是第一页
        }

        // 这里分页的规则(你可以自由修改): 1页10调数据, 按照 id 倒序排列
        Pageable pageable = PageRequest.of(
                page - 1, 10, Sort.by("id").descending()
        );
        Page orderPage = ecommerceGoodsDao.findAll(pageable);

        // 是否还有更多页: 总页数是否大于当前给定的页
        boolean hasMore = orderPage.getTotalPages() > page;

        return new PageSimpleGoodsInfo(
                orderPage.getContent().stream()
                        .map(EcommerceGoods::toSimple).collect(Collectors.toList()),
                hasMore
        );
    }

    @Override
    public List getSimpleGoodsInfoByTableId(TableId tableId) {
        // 获取商品的简单信息, 可以从 redis cache 中去拿, 拿不到需要从 DB 中获取并保存到 Redis 里面
        // Redis 中的 KV 都是字符串类型
        List