« Background task » : différence entre les versions
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Aucun résumé des modifications |
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(8 versions intermédiaires par le même utilisateur non affichées) | |||
Ligne 11 : | Ligne 11 : | ||
protected override async Task ExecuteAsync(CancellationToken stoppingToken) | protected override async Task ExecuteAsync(CancellationToken stoppingToken) | ||
{ | { | ||
using | using var scope = services.CreateScope(); | ||
var scopedService = scope.ServiceProvider.GetRequiredService<IMyScopedService>(); | |||
await scopedService.DoWork(stoppingToken); | |||
} | } | ||
Ligne 26 : | Ligne 24 : | ||
<filebox fn='Program.cs'> | <filebox fn='Program.cs'> | ||
builder.Services.AddHostedService<MyBackgroundService>(); | |||
builder.Services.AddScoped<IMyScopedService, MyScopedService>(); | |||
</filebox> | </filebox> | ||
= [https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?tabs=visual-studio#queued-background-tasks Queued background tasks] = | = [https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?tabs=visual-studio#queued-background-tasks Queued background tasks] = | ||
<filebox fn='ItemQueue'> | |||
public class ItemQueue<T> : IItemQueue | |||
{ | |||
private readonly ConcurrentQueue<T> queue = new(); | |||
public void Enqueue(T item) => queue.Enqueue(item); | |||
public bool TryDequeue(out T item) => queue.TryDequeue(out item); | |||
} | |||
public interface IItemQueue<T> | |||
{ | |||
void Enqueue(T item); | |||
bool TryDequeue(out T item); | |||
} | |||
</filebox> | |||
<filebox fn='QueuedHostedService.cs'> | <filebox fn='QueuedHostedService.cs'> | ||
public class QueuedHostedService( | public class QueuedHostedService(IItemQueue itemQueue) : BackgroundService | ||
{ | { | ||
public IItemQueue ItemQueue { get; } = itemQueue; | |||
protected override async Task ExecuteAsync(CancellationToken stoppingToken) | protected override async Task ExecuteAsync(CancellationToken stoppingToken) | ||
{ | { | ||
while (!stoppingToken.IsCancellationRequested) | while (!stoppingToken.IsCancellationRequested) | ||
{ | { | ||
await Task.Delay(1000, stoppingToken); | |||
if (ItemQueue.TryDequeueAsync(out var item)) | |||
{ | { | ||
await | await DoAsync(item); | ||
} | } | ||
} | } | ||
} | } | ||
Ligne 53 : | Ligne 67 : | ||
<filebox fn='Program.cs'> | <filebox fn='Program.cs'> | ||
services.AddHostedService<QueuedHostedService>(); | services.AddHostedService<QueuedHostedService>(); | ||
services.AddSingleton< | services.AddSingleton<IItemQueue<MyItem>, ItemQueue<MyItem>>(); | ||
</filebox> | </filebox> | ||
= [https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?tabs=visual-studio#timed-background-tasks Timed background tasks] = | = [https://learn.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services?tabs=visual-studio#timed-background-tasks Timed background tasks] = |
Dernière version du 18 septembre 2024 à 12:15
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Description
In ASP.NET Core, background tasks can be implemented as hosted services.
Consuming a scoped service in a background task
MyBackgroundService.cs |
public class MyBackgroundService(IServiceProvider services) : BackgroundService { protected override async Task ExecuteAsync(CancellationToken stoppingToken) { using var scope = services.CreateScope(); var scopedService = scope.ServiceProvider.GetRequiredService<IMyScopedService>(); await scopedService.DoWork(stoppingToken); } public override async Task StopAsync(CancellationToken stoppingToken) { await base.StopAsync(stoppingToken); } } |
Program.cs |
builder.Services.AddHostedService<MyBackgroundService>(); builder.Services.AddScoped<IMyScopedService, MyScopedService>(); |
Queued background tasks
ItemQueue |
public class ItemQueue<T> : IItemQueue { private readonly ConcurrentQueue<T> queue = new(); public void Enqueue(T item) => queue.Enqueue(item); public bool TryDequeue(out T item) => queue.TryDequeue(out item); } public interface IItemQueue<T> { void Enqueue(T item); bool TryDequeue(out T item); } |
QueuedHostedService.cs |
public class QueuedHostedService(IItemQueue itemQueue) : BackgroundService { public IItemQueue ItemQueue { get; } = itemQueue; protected override async Task ExecuteAsync(CancellationToken stoppingToken) { while (!stoppingToken.IsCancellationRequested) { await Task.Delay(1000, stoppingToken); if (ItemQueue.TryDequeueAsync(out var item)) { await DoAsync(item); } } } } |
Program.cs |
services.AddHostedService<QueuedHostedService>(); services.AddSingleton<IItemQueue<MyItem>, ItemQueue<MyItem>>(); |