60767c4724
* Isolate background workflow dispatches from caller's cancellation token When dispatching multiple child workflows, early child completions cancel the parent activity's token while dispatches are still in progress. This creates a race condition where remaining dispatches fail with OperationCanceledException. * Make BackgroundWorkflowDispatcher & BackgroundStimulusDispatcher caller Cts-independent
31 lines
1.1 KiB
C#
31 lines
1.1 KiB
C#
using Elsa.Common.Multitenancy;
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using Elsa.Mediator;
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using Elsa.Mediator.Contracts;
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using Elsa.Tenants.Mediator;
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using Elsa.Workflows.Runtime.Commands;
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using Elsa.Workflows.Runtime.Requests;
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using Elsa.Workflows.Runtime.Responses;
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namespace Elsa.Workflows.Runtime;
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/// <summary>
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/// A simple implementation that queues the specified request for delivering stimuli on a non-durable background worker.
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/// </summary>
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public class BackgroundStimulusDispatcher(ICommandSender commandSender, ITenantAccessor tenantAccessor) : IStimulusDispatcher
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{
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/// <inheritdoc />
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public async Task<DispatchStimulusResponse> SendAsync(DispatchStimulusRequest request, CancellationToken cancellationToken = default)
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{
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var command = new DispatchStimulusCommand(request);
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// Background commands run independently of caller's lifecycle.
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await commandSender.SendAsync(command, CommandStrategy.Background, CreateHeaders(), CancellationToken.None);
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return DispatchStimulusResponse.Empty;
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}
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private IDictionary<object, object> CreateHeaders()
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{
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return TenantHeaders.CreateHeaders(tenantAccessor.Tenant?.Id);
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}
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}
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