开发注意事项

ArrayList<Object> objects = Lists.newArrayList();
HashMap<Object, Object> objectObjectHashMap = Maps.newHashMap();
HashSet<Object> objects1 = Sets.newHashSet();
Map<String, Object> map = new HashMap<>(16);
HashMap<Object, Object> objectObjectHashMap = Maps.newHashMapWithExpectedSize(16);
StringUtils  org.apache.commons.lang3
CollectionUtils  org.apache.commons.collections4.CollectionUtils
MapUtils  org.apache.commons.collections4.CollectionUtils
Collections.emptyList();
Collections.emptySet();
Collections.singletonList();
安全容器
List<SupplierTodoDTO> result = Collections.synchronizedList(new LinkedList<>());
CopyOnWriteArrayList<Object> objects = new CopyOnWriteArrayList<>();

@NotNull(message = "操作人misId不合法")  用于判断基础数据类 对象等
@NotBlank(message = "配置名称不能为空")  判断String
@NotEmpty(message = "配置列表不能为空") 集合类
@Length(min = 1, max = 100, message = "标题不合法") String类型长度
@Range(min = 0, max = 1, message = "force字段不合法")   int等的范围
@Valid
@NotNull(message = "分页信息不能为空")
private Page paging;

List<AnnouncementFirstListResponseVO> sortedUnRead = unReadList.stream().map(item -> Pair.of(item.getAnnouncementVO().getId(), item))
                .sorted(Comparator.comparing(Pair::getLeft))
                .map(Pair::getRight)
                .collect(Collectors.toList());
sortedSupplierTodoDTOList = sortedSupplierTodoDTOList.stream()
                    .filter(Objects::nonNull)
                    .sorted(Comparator.comparing(SupplierTodoDTO::getOrderId, Comparator.reverseOrder()).thenComparingInt(SupplierTodoDTO::getTaskId))
                    .collect(Collectors.toList());

@EnableAspectJAutoProxy(proxyTargetClass = true, exposeProxy = true)
((MessageSendServiceImpl)AopContext.currentProxy()).saveTaskAndDetail(batchTask, batchMessageDetails);
@Transactional(rollbackFor = Exception.class)
    public void saveTaskAndDetail(BatchTask batchTask, List<BatchMessageDetail> batchMessageDetails) {
        batchTaskService.createBatchTask(batchTask);
        batchMessageDetailRepository.add(batchMessageDetails);
    }

@EnableTransactionManagement(proxyTargetClass = true)
@EnableRetry
类上面的注解
@Retryable(backoff = @Backoff(delay = 100))

1.出入参加日志
2.重点：数据库：性能和sql的正确性
3.profile：线上线下哪里应该一致，哪里应该不同
4.新增文件看性能。修改原来的文件看影响 try catch
5.每一个文件，每一行代码都要过到
6.数据库修改 加代码，，出入对称（新增字段）
7.早判断，早结束。避免多层if else循环嵌套。一个if不通过，直接return，避免里面继续嵌套if else
8.if判断常量放前面
9.需要有默认值，默认值以default开头，StringUtils.defaultString(业务逻辑值可能为空,默认值)
10.但凡是状态，必须用枚举

类名，方法名，常量，异常处理
参数校验尽量提取能抽到一个方法抽取到一个方法中
方法和类上一定要有注释
清楚职能
a调b，b调c，c调d，d调f  特别糟糕
应该是有一个主方法：
a   调  b，c，d，f
提供代码质量：一开始进行类设计的时候没有梳理好，没有想清楚每个类和方法的职能，
就是一条线顺着写下去，a方法调b，b调c，c调d，光想着去实现功能。如何解决：想清楚类的职能，
先用一句话去给同事讲明白这个类要做什么，以及方法是干什么，然后再用三个英文单词做总结提炼。
方法的命名过长可以根据返回值和入参这些信息对命名做精简。想清楚这些，代码总体结构就会好很多。

ArrayList<Object> objects = Lists.newArrayList();
HashMap<Object, Object> objectObjectHashMap = Maps.newHashMap();
HashSet<Object> objects1 = Sets.newHashSet();
Map<String, Object> map = new HashMap<>(16);
HashMap<Object, Object> objectObjectHashMap = Maps.newHashMapWithExpectedSize(16);

如果选择insert 只设置了部分值，比如id，name，age  只设置name

insert into tb_user (id，name，age) value (null，"张三"，null);

选择insertSelective

insert into tb_user (id，name) value (null，"张三");  主键通常自增

如果age有默认值，设置为默认值，没有默认值允许为null，则为null，不允许为null，还没有设置报错

update user
    <set>
      <if test="name != null">
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="pwd != null">
        pwd = #{pwd,jdbcType=VARCHAR},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}

 update user
    set name = #{name,jdbcType=VARCHAR},
      pwd = #{pwd,jdbcType=VARCHAR}
    where id = #{id,jdbcType=INTEGER}

    <select id="countByParam" parameterType="com.meituan.groceryscm.sqm.notification.os.service.adapter.dal4vss.param.QueryAnnouncementListParam"
            resultType="java.lang.Integer">
        select count(*) from announcement_info a
        <where>
            <if test="creator !=null and creator !=''">
                AND a.creator =#{creator}
            </if>
            <if test="title !=null and title !='' ">
                AND a.title like concat(#{title},'%')
            </if>
            <if test="receivers !=null and receivers.size() > 0">
                AND a.receiver IN
                <foreach collection="receivers"  item="receiver" open="(" separator="," close=")">
                    #{receiver}
                </foreach>
            </if>
            <if test="beginTime != null and beginTime > 0 and endTime != null and endTime>0">
                and a.begin_time >= #{beginTime,jdbcType=BIGINT}
                and #{endTime,jdbcType=BIGINT} >= a.begin_time
            </if>
            <if test="announcementType != null and announcementType > 0">
                and a.announcement_type = #{announcementType,jdbcType=BIGINT}
            </if>
            <if test="tag != null and tag > 0">
                AND a.tag =#{tag}
            </if>
            AND valid = 1
        </where>
    </select>

        // 获取品退商家
        List<Long> refundSupplierByCalculateDateList;
        try {
            // 强制走主库
            ZebraForceMasterHelper.forceMasterInLocalContext();
            refundSupplierByCalculateDateList = refundSupplierRepository.searchRefundSupplierByCalculateDate(calculateDate, taskId);
            log.info("获取到品退商家：refundSupplierByCalculateDateList:{} size:{}", JsonTool.writeToString(refundSupplierByCalculateDateList), refundSupplierByCalculateDateList.size());
        } finally {
            ZebraForceMasterHelper.clearLocalContext();
        }