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Building Workflow Driven .NET Applications With Elsa 2 - Part 5
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| using System.Threading; | |
| using System.Threading.Tasks; | |
| using DocumentManagement.Core.Events; | |
| using Elsa.Models; | |
| using Elsa.Services; | |
| using MediatR; | |
| namespace DocumentManagement.Workflows.Handlers | |
| { | |
| /// <summary> | |
| /// Handles the <see cref="NewDocumentReceived"/> event by starting the HelloFile workflow. | |
| /// </summary> | |
| public class StartHelloFileWorkflow : INotificationHandler<NewDocumentReceived> | |
| { | |
| private readonly IWorkflowRegistry _workflowRegistry; | |
| private readonly IWorkflowDefinitionDispatcher _workflowDispatcher; | |
| public StartHelloFileWorkflow(IWorkflowRegistry workflowRegistry, IWorkflowDefinitionDispatcher workflowDispatcher) | |
| { | |
| _workflowRegistry = workflowRegistry; | |
| _workflowDispatcher = workflowDispatcher; | |
| } | |
| public async Task Handle(NewDocumentReceived notification, CancellationToken cancellationToken) | |
| { | |
| var document = notification.Document; | |
| // Get our HelloFile workflow. | |
| var workflow = | |
| await _workflowRegistry.GetAsync("HelloFile", default, VersionOptions.Published, cancellationToken); | |
| if (workflow == null) | |
| return; // Do nothing. | |
| // Dispatch the workflow. | |
| await _workflowDispatcher.DispatchAsync(new ExecuteWorkflowDefinitionRequest(workflow!.Id, Input: new WorkflowInput(document.Id)), cancellationToken); | |
| } | |
| } | |
| } |
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