78 lines
2.8 KiB
C#
78 lines
2.8 KiB
C#
using MediatR;
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using TakeoutSaaS.Application.App.Tenants.Commands;
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using TakeoutSaaS.Application.App.Tenants.Dto;
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using TakeoutSaaS.Application.Messaging.Abstractions;
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using TakeoutSaaS.Domain.Tenants.Enums;
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using TakeoutSaaS.Domain.Tenants.Events;
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using TakeoutSaaS.Domain.Tenants.Repositories;
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using TakeoutSaaS.Shared.Abstractions.Constants;
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using TakeoutSaaS.Shared.Abstractions.Exceptions;
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using TakeoutSaaS.Shared.Abstractions.Tenancy;
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namespace TakeoutSaaS.Application.App.Tenants.Handlers;
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/// <summary>
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/// 撤销公告处理器。
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/// </summary>
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public sealed class RevokeAnnouncementCommandHandler(
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ITenantAnnouncementRepository announcementRepository,
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ITenantProvider tenantProvider,
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IEventPublisher eventPublisher)
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: IRequestHandler<RevokeAnnouncementCommand, TenantAnnouncementDto?>
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{
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/// <inheritdoc />
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public async Task<TenantAnnouncementDto?> Handle(RevokeAnnouncementCommand request, CancellationToken cancellationToken)
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{
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if (request.RowVersion == null || request.RowVersion.Length == 0)
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{
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throw new BusinessException(ErrorCodes.ValidationFailed, "RowVersion 不能为空");
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}
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// 1. 查询公告
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var tenantId = tenantProvider.GetCurrentTenantId();
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var announcement = await announcementRepository.FindByIdAsync(tenantId, request.AnnouncementId, cancellationToken);
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if (announcement == null)
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{
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return null;
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}
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// 2. 校验状态
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if (announcement.Status != AnnouncementStatus.Published)
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{
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if (announcement.Status == AnnouncementStatus.Revoked)
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{
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throw new BusinessException(ErrorCodes.Conflict, "公告已撤销");
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}
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throw new BusinessException(ErrorCodes.Conflict, "仅已发布公告允许撤销");
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}
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// 3. 撤销公告
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announcement.Status = AnnouncementStatus.Revoked;
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announcement.RevokedAt = DateTime.UtcNow;
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announcement.RowVersion = request.RowVersion;
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try
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{
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await announcementRepository.UpdateAsync(announcement, cancellationToken);
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await announcementRepository.SaveChangesAsync(cancellationToken);
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}
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catch (Exception exception) when (exception.GetType().Name == "DbUpdateConcurrencyException")
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{
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throw new BusinessException(ErrorCodes.Conflict, "公告已被修改，请刷新后重试");
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}
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// 4. 发布领域事件
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await eventPublisher.PublishAsync(
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"tenant-announcement.revoked",
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new AnnouncementRevoked
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{
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AnnouncementId = announcement.Id,
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RevokedAt = announcement.RevokedAt ?? DateTime.UtcNow
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},
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cancellationToken);
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return announcement.ToDto(false, null);
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}
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}
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