34 lines
1.3 KiB
C#
34 lines
1.3 KiB
C#
using GroupService.Domain.Events;
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using GroupService.Infrastructure;
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using IM.Commons.IntegrationEvents;
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using MassTransit;
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using MediatR;
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namespace GroupService.WebApi.Application.EventHandler
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{
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public class GroupMemberJoinedHandler : INotificationHandler<GroupMemberJoinedDomainEvent>
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{
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private readonly IPublishEndpoint endpoint;
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private readonly GroupDbContext db;
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public GroupMemberJoinedHandler(IPublishEndpoint endpoint, GroupDbContext db)
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{
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this.endpoint = endpoint;
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this.db = db;
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}
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public async Task Handle(GroupMemberJoinedDomainEvent notification, CancellationToken cancellationToken)
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{
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var member = notification.Member;
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// 用 FindAsync 而非 FirstOrDefaultAsync：群可能刚创建尚未提交到数据库，FindAsync 先查内存跟踪器
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var group = await db.Set<Domain.Entities.Group>().FindAsync(member.GroupId);
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var groupName = group?.Name ?? "群聊";
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var groupAvatar = group?.Avatar;
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await endpoint.Publish(new GroupMemberJoinedEvent(member.Id,
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member.UserId, member.GroupId, member.GroupNickName, member.Avatar,
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member.Role.ToString(), groupName, groupAvatar), cancellationToken);
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}
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}
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}
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