57 lines
1.7 KiB
C#
57 lines
1.7 KiB
C#
using MilliSim.Services.Infrastructure;
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namespace MilliSim.Services;
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/// <summary>
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/// 后台定时任务：垃圾资源清理。
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/// 每 6 小时扫描 PendingUploads 表，清理 24 小时前上传但未被消费（未保存到实体）的孤立文件。
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/// 应对浏览器关闭、刷新等极端情况下前端无法触发清理的场景。
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/// </summary>
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public class UploadCleanupJob : IHostedService, IDisposable
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{
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private readonly IServiceProvider _serviceProvider;
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private Timer? _timer;
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// 检查间隔：6 小时
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private static readonly TimeSpan CheckInterval = TimeSpan.FromHours(6);
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// 过期时间：24 小时未消费则清理
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private const int ExpireHours = 24;
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public UploadCleanupJob(IServiceProvider serviceProvider)
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{
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_serviceProvider = serviceProvider;
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}
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public Task StartAsync(CancellationToken cancellationToken)
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{
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// 启动后 5 分钟执行第一次（避免启动时并发），之后每 6 小时一次
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_timer = new Timer(DoWork, null, TimeSpan.FromMinutes(5), CheckInterval);
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return Task.CompletedTask;
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}
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public Task StopAsync(CancellationToken cancellationToken)
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{
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_timer?.Change(Timeout.Infinite, 0);
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return Task.CompletedTask;
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}
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public void Dispose()
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{
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_timer?.Dispose();
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}
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private async void DoWork(object? state)
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{
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try
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{
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using var scope = _serviceProvider.CreateScope();
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var uploadTracking = scope.ServiceProvider.GetRequiredService<IUploadTrackingService>();
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await uploadTracking.CleanupExpiredAsync(ExpireHours);
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}
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catch
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{
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// 后台任务异常不应影响应用运行
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}
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}
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}
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