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Add ServiceProviderAccessor to allow access to IServiceProvider
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16 changes: 16 additions & 0 deletions
16
src/Temporalio.Extensions.Hosting/IServiceProviderAccessor.cs
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using System; | ||
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namespace Temporalio.Extensions.Hosting | ||
{ | ||
/// <summary> | ||
/// Provides access to the current, scoped <see cref="IServiceProvider"/> if | ||
/// one is available. | ||
/// </summary> | ||
public interface IServiceProviderAccessor | ||
{ | ||
/// <summary> | ||
/// Gets or sets the current service provider. | ||
/// </summary> | ||
IServiceProvider? ServiceProvider { get; set; } | ||
} | ||
} |
42 changes: 42 additions & 0 deletions
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src/Temporalio.Extensions.Hosting/ServiceProviderAccessor.cs
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using System; | ||
using System.Threading; | ||
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namespace Temporalio.Extensions.Hosting | ||
{ | ||
/// <summary> | ||
/// Provides an implementation of <see cref="IServiceProvider" /> based on | ||
/// the current execution context. | ||
/// </summary> | ||
public class ServiceProviderAccessor : IServiceProviderAccessor | ||
{ | ||
private static readonly AsyncLocal<ServiceProviderHolder> ServiceProviderCurrent = new(); | ||
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/// <inheritdoc/> | ||
public IServiceProvider? ServiceProvider | ||
{ | ||
get => ServiceProviderCurrent.Value?.ServiceProvider; | ||
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set | ||
{ | ||
var holder = ServiceProviderCurrent.Value; | ||
if (holder != null) | ||
{ | ||
// Clear current IServiceProvider trapped in the AsyncLocals, as its done. | ||
holder.ServiceProvider = null; | ||
} | ||
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if (value != null) | ||
{ | ||
// Use an object indirection to hold the IServiceProvider in the AsyncLocal, | ||
// so it can be cleared in all ExecutionContexts when its cleared. | ||
ServiceProviderCurrent.Value = new ServiceProviderHolder { ServiceProvider = value }; | ||
} | ||
} | ||
} | ||
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private sealed class ServiceProviderHolder | ||
{ | ||
public IServiceProvider? ServiceProvider { get; set; } | ||
} | ||
} | ||
} |
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