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404 lines
17 KiB
404 lines
17 KiB
package com.mydreamjob.job;
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import com.mydreamjob.common.exception.BusinessException;
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import com.mydreamjob.common.exception.ErrorCode;
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import com.mydreamjob.company.Company;
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import com.mydreamjob.company.CompanyRepository;
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import com.mydreamjob.company.VerifiedCompanyGuard;
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import com.mydreamjob.job.dto.JobCreateRequest;
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import com.mydreamjob.job.dto.JobSearchItem;
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import com.mydreamjob.job.dto.JobStatusRequest;
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import com.mydreamjob.job.dto.JobUpdateRequest;
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import com.mydreamjob.job.dto.CompanyManagedJobItem;
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import jakarta.persistence.EntityManager;
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import jakarta.persistence.PersistenceContext;
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import jakarta.persistence.TypedQuery;
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import jakarta.persistence.criteria.*;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.PageImpl;
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import org.springframework.data.domain.PageRequest;
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import org.springframework.data.domain.Pageable;
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import org.springframework.data.domain.Sort;
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import org.springframework.data.jpa.domain.Specification;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import java.time.LocalDateTime;
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import java.util.*;
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import java.util.stream.Collectors;
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/**
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* 岗位管理 Service
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*/
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@Slf4j
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@Service
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@RequiredArgsConstructor
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public class JobService {
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private final JobRepository jobRepository;
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private final CompanyRepository companyRepository;
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@PersistenceContext
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private EntityManager entityManager;
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// ── 企业端接口 ──────────────────────────────────────────────
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/**
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* 创建岗位（默认 DRAFT）
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*/
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@Transactional
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public Job createJob(Long companyId, JobCreateRequest req) {
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Job job = Job.builder()
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.companyId(companyId)
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.title(req.getTitle())
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.description(req.getDescription())
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.requirements(req.getRequirements())
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.city(req.getCity())
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.employmentType(req.getEmploymentType())
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.salaryMin(req.getSalaryMin())
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.salaryMax(req.getSalaryMax())
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.status(JobStatus.DRAFT.name())
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.build();
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return jobRepository.save(job);
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}
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/**
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* 查询岗位详情（含非 PUBLISHED 状态）
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*/
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public Job getJob(Long jobId) {
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return jobRepository.findById(jobId)
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.orElseThrow(() -> new BusinessException(ErrorCode.JOB_NOT_FOUND));
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}
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/**
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* 更新岗位（仅岗位所属企业可操作，部分字段更新）
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*/
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@Transactional
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public Job updateJob(Long companyId, Long jobId, JobUpdateRequest req) {
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Job job = getCompanyJob(companyId, jobId);
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if (!JobStatus.DRAFT.name().equals(job.getStatus())) {
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requireVerifiedCompany(companyId);
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}
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if (req.getTitle() != null) job.setTitle(req.getTitle());
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if (req.getDescription() != null) job.setDescription(req.getDescription());
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if (req.getRequirements() != null) job.setRequirements(req.getRequirements());
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if (req.getCity() != null) job.setCity(req.getCity());
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if (req.getEmploymentType() != null) job.setEmploymentType(req.getEmploymentType());
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if (req.getSalaryMin() != null) job.setSalaryMin(req.getSalaryMin());
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if (req.getSalaryMax() != null) job.setSalaryMax(req.getSalaryMax());
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return jobRepository.save(job);
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}
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/**
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* 状态流转：DRAFT→PUBLISHED，PUBLISHED→CLOSED；禁止非法回退
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*/
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@Transactional
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public Job transitionStatus(Long companyId, Long jobId, JobStatusRequest req) {
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String target = req.getStatus();
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// 未认证企业的发布请求必须在按 jobId 查询前拒绝，避免通过 400/404 差异探测岗位。
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if (JobStatus.PUBLISHED.name().equals(target)) {
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requireVerifiedCompany(companyId);
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}
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Job job = getCompanyJob(companyId, jobId);
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String current = job.getStatus();
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// 校验状态流转合法性
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boolean valid = switch (current) {
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case "DRAFT" -> "PUBLISHED".equals(target);
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case "PUBLISHED" -> "CLOSED".equals(target);
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case "CLOSED" -> false; // CLOSED 不可再流转
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default -> false;
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};
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if (!valid) {
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throw new BusinessException(ErrorCode.INVALID_JOB_STATUS_TRANSITION);
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}
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job.setStatus(target);
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if ("PUBLISHED".equals(target)) {
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job.setPublishedAt(LocalDateTime.now());
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}
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return jobRepository.save(job);
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}
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/** 用企业主键解析权威认证状态，供岗位与投递服务在已确认归属后执行统一门禁。 */
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public Company requireVerifiedCompany(Long companyId) {
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return VerifiedCompanyGuard.requireVerified(
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companyRepository.findById(companyId).orElse(null));
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}
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/**
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* 读取当前企业自己的岗位；对外统一将其他企业资源与不存在资源表示为 JOB_NOT_FOUND，
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* 不向调用方泄露跨企业资源是否存在。
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*/
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public Job getCompanyJob(Long companyId, Long jobId) {
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return jobRepository.findByIdAndCompanyId(jobId, companyId)
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.orElseThrow(() -> new BusinessException(ErrorCode.JOB_NOT_FOUND));
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}
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/** 查询当前企业自己的全部岗位状态；不调用发布门禁，也不产生写入副作用。 */
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@Transactional(readOnly = true)
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public Page<CompanyManagedJobItem> listCompanyJobs(Long companyId, String status,
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String keyword, String city,
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int page, int size) {
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if (companyId == null || companyId <= 0 || page < 0 || size < 1 || size > 100) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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if (status != null) {
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try {
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JobStatus.valueOf(status);
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} catch (IllegalArgumentException exception) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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}
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String normalizedKeyword = normalizeFilter(keyword, 120);
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String normalizedCity = normalizeFilter(city, 80);
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Pageable pageable = PageRequest.of(page, size, Sort.by(
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Sort.Order.desc("createdAt"), Sort.Order.desc("id")));
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return jobRepository.findAll(CompanyJobManagementSpecification.forCompany(
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companyId, status, normalizedKeyword, normalizedCity), pageable)
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.map(CompanyManagedJobItem::from);
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}
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private String normalizeFilter(String value, int maxLength) {
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if (value == null || value.isBlank()) return null;
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String normalized = value.trim();
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if (normalized.length() > maxLength) throw new BusinessException(ErrorCode.BAD_REQUEST);
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return normalized;
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}
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// ── 公开接口 ────────────────────────────────────────────────
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/**
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* 公开岗位列表：仅返回 PUBLISHED，支持筛选和分页
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*
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* <p>DEF-01：关键词在此处规范化，使其与 {@code GET /jobs/search}
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* （{@code JobSearchSpecification} 的 {@code keyword.trim()} + {@code isBlank()} 判空）
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* 的输入语义一致 —— 只去两端空白，空串与纯空白等同「未传关键词」，
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* 不折叠中间空格、不改大小写，也不改变任何过滤/排序/分页语义。</p>
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*/
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public Page<Map<String, Object>> listPublishedJobs(String keyword, String city,
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String employmentType,
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Integer salaryMin, Integer salaryMax,
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int page, int size) {
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if (salaryMin != null && salaryMax != null && salaryMin > salaryMax) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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String normalizedKeyword = keyword == null || keyword.isBlank() ? null : keyword.trim();
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Pageable pageable = PageRequest.of(page, size, Sort.by(Sort.Direction.DESC, "createdAt"));
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Page<Job> result = jobRepository.findPublishedJobs(normalizedKeyword, city, employmentType,
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salaryMin, salaryMax, pageable);
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return result.map(this::toPublicView);
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}
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/**
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* 公开岗位详情：返回 PUBLISHED 岗位；CLOSED 岗位也允许查看但不可投递（本阶段不处理投递）
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*/
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public Map<String, Object> getPublicJob(Long jobId) {
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Job job = getJob(jobId);
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if (!"PUBLISHED".equals(job.getStatus()) && !"CLOSED".equals(job.getStatus())) {
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// DRAFT 岗位对公众不可见
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throw new BusinessException(ErrorCode.JOB_NOT_FOUND);
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}
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return toPublicView(job);
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}
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// ── 辅助方法 ────────────────────────────────────────────────
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public Job assertOwnerOrThrow(Long companyId, Long jobId) {
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Job job = getJob(jobId);
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if (!companyId.equals(job.getCompanyId())) {
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throw new BusinessException(ErrorCode.JOB_OWNER_MISMATCH);
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}
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return job;
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}
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/**
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* 企业端视图（含完整字段）
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*/
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public Map<String, Object> toView(Job job) {
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Map<String, Object> view = new HashMap<>();
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view.put("id", job.getId());
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view.put("companyId", job.getCompanyId());
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view.put("title", job.getTitle());
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view.put("description", job.getDescription());
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view.put("requirements", job.getRequirements());
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view.put("city", job.getCity());
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view.put("employmentType", job.getEmploymentType());
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view.put("salaryMin", job.getSalaryMin());
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view.put("salaryMax", job.getSalaryMax());
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view.put("status", job.getStatus());
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view.put("publishedAt", job.getPublishedAt());
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view.put("createdAt", job.getCreatedAt());
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view.put("updatedAt", job.getUpdatedAt());
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return view;
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}
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/**
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* 公开视图（精简字段）
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*/
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public Map<String, Object> toPublicView(Job job) {
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Map<String, Object> view = new HashMap<>();
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view.put("id", job.getId());
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view.put("companyId", job.getCompanyId());
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view.put("title", job.getTitle());
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view.put("description", job.getDescription());
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view.put("requirements", job.getRequirements());
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view.put("city", job.getCity());
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view.put("employmentType", job.getEmploymentType());
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view.put("salaryMin", job.getSalaryMin());
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view.put("salaryMax", job.getSalaryMax());
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view.put("status", job.getStatus());
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view.put("publishedAt", job.getPublishedAt());
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view.put("createdAt", job.getCreatedAt());
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return view;
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}
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// ── 高级搜索 ────────────────────────────────────────────────
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private static final Set<String> ALLOWED_SORTS = Set.of("latest", "salary", "relevance");
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private static final int MAX_PAGE_SIZE = 50;
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/**
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* 高级搜索：仅返回 PUBLISHED 岗位，支持多条件筛选、排序、分页。
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* 企业信息通过批量查询组装，避免 N+1。
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* sort=salary 时通过 CriteriaQuery 显式构建 CASE 排序，确保 salaryMax=NULL 排在最后。
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*/
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public Page<JobSearchItem> searchJobs(String keyword, String city, String employmentType,
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Integer salaryMin, Integer salaryMax, Long companyId,
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String sort, int page, int size) {
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// 参数校验
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if (salaryMin != null && salaryMax != null && salaryMin > salaryMax) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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if (sort != null && !ALLOWED_SORTS.contains(sort)) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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if (page < 0) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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if (size < 1 || size > MAX_PAGE_SIZE) {
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throw new BusinessException(ErrorCode.BAD_REQUEST);
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}
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var spec = JobSearchSpecification.searchJobs(keyword, city, employmentType,
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salaryMin, salaryMax, companyId);
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Page<Job> jobPage;
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if ("salary".equals(sort)) {
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// salary 排序：显式 CASE WHEN 确保 NULL 排在最后
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jobPage = findWithSalarySort(spec, page, size);
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} else {
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// latest 和 relevance 都按 latest 排序
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Sort sortObj = Sort.by(
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new Sort.Order(Sort.Direction.DESC, "createdAt"),
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new Sort.Order(Sort.Direction.DESC, "id"));
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Pageable pageable = PageRequest.of(page, size, sortObj);
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jobPage = jobRepository.findAll(spec, pageable);
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}
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// 批量查询企业信息
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Set<Long> companyIds = jobPage.getContent().stream()
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.map(Job::getCompanyId)
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.collect(Collectors.toSet());
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Map<Long, Company> companyMap = companyIds.isEmpty()
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? Map.of()
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: companyRepository.findAllById(companyIds).stream()
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.collect(Collectors.toMap(Company::getId, c -> c));
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return jobPage.map(job -> toSearchItem(job, companyMap.get(job.getCompanyId())));
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}
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/**
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* 使用 CriteriaQuery + CASE WHEN 实现 salaryMax DESC NULLS LAST。
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*/
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Page<Job> findWithSalarySort(Specification<Job> spec, int page, int size) {
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CriteriaBuilder cb = entityManager.getCriteriaBuilder();
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// 查询
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CriteriaQuery<Job> cq = cb.createQuery(Job.class);
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Root<Job> root = cq.from(Job.class);
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Predicate predicate = spec.toPredicate(root, cq, cb);
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if (predicate != null) {
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cq.where(predicate);
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}
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// CASE WHEN salaryMax IS NULL THEN 1 ELSE 0 END → NULL 排最后
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cq.orderBy(
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cb.asc(cb.selectCase()
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.when(cb.isNull(root.get("salaryMax")), 1)
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.otherwise(0)),
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cb.desc(root.get("salaryMax")),
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cb.desc(root.get("id"))
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);
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TypedQuery<Job> query = entityManager.createQuery(cq);
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query.setFirstResult(page * size);
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query.setMaxResults(size);
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List<Job> jobs = query.getResultList();
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// 计数
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CriteriaQuery<Long> countCq = cb.createQuery(Long.class);
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Root<Job> countRoot = countCq.from(Job.class);
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Predicate countPredicate = spec.toPredicate(countRoot, countCq, cb);
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if (countPredicate != null) {
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countCq.where(countPredicate);
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}
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countCq.select(cb.count(countRoot));
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Long total = entityManager.createQuery(countCq).getSingleResult();
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return new PageImpl<>(jobs, PageRequest.of(page, size), total);
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}
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private JobSearchItem toSearchItem(Job job, Company company) {
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JobSearchItem.CompanyInfo info = null;
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if (company != null) {
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info = JobSearchItem.CompanyInfo.builder()
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.id(company.getId())
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.name(company.getName())
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.logoUrl(company.getLogoUrl())
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.verified(company.getVerified())
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.build();
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}
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return JobSearchItem.builder()
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.id(job.getId())
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.title(job.getTitle())
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.description(job.getDescription())
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.requirements(job.getRequirements())
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.city(job.getCity())
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.employmentType(job.getEmploymentType())
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.salaryMin(job.getSalaryMin())
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.salaryMax(job.getSalaryMax())
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.status(job.getStatus())
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.publishedAt(job.getPublishedAt())
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.createdAt(job.getCreatedAt())
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.company(info)
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.build();
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}
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// ── 筛选选项 ────────────────────────────────────────────────
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/**
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* 获取筛选选项：仅基于 PUBLISHED 岗位，使用数据库聚合查询，不加载全部岗位到内存。
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*/
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public Map<String, Object> getFilterOptions() {
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List<String> cities = jobRepository.findDistinctCitiesPublished();
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List<String> employmentTypes = jobRepository.findDistinctEmploymentTypesPublished();
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Integer minSalary = jobRepository.findMinSalaryPublished();
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Integer maxSalary = jobRepository.findMaxSalaryPublished();
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Map<String, Object> salaryRange = new HashMap<>();
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salaryRange.put("min", minSalary);
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salaryRange.put("max", maxSalary);
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Map<String, Object> result = new HashMap<>();
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result.put("cities", cities != null ? cities : Collections.emptyList());
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result.put("employmentTypes", employmentTypes != null ? employmentTypes : Collections.emptyList());
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result.put("salaryRange", salaryRange);
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return result;
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}
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}
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