Building Workflow Driven .NET Applications With Elsa 2 - Part 3

hello-world.json

{
  "$id": "1",
  "definitionId": "21c8e4c36dee486d8fca566881ea79b4",
  "versionId": "05f9f30ee43147b5b2edbb5f723f94d2",
  "name": "HelloWorld",
  "displayName": "Hello World",
  "version": 1,
  "variables": {
    "$id": "2",
    "data": {}
  },
  "customAttributes": {
    "$id": "3",
    "data": {}
  },
  "isSingleton": false,
  "persistenceBehavior": "WorkflowBurst",
  "deleteCompletedInstances": false,
  "isPublished": true,
  "isLatest": true,
  "activities": [
    {
      "$id": "4",
      "activityId": "06b927c7-be55-4958-97b5-ab84393eebc6",
      "type": "HttpEndpoint",
      "displayName": "HTTP Endpoint",
      "persistWorkflow": false,
      "loadWorkflowContext": false,
      "saveWorkflowContext": false,
      "properties": [
        {
          "$id": "5",
          "name": "Path",
          "expressions": {
            "$id": "6",
            "Literal": "/hello-world"
          }
        },
        {
          "$id": "7",
          "name": "Methods",
          "expressions": {
            "$id": "8",
            "Json": "[\"GET\"]"
          }
        },
        {
          "$id": "9",
          "name": "ReadContent",
          "expressions": {
            "$id": "10"
          }
        },
        {
          "$id": "11",
          "name": "TargetType",
          "expressions": {
            "$id": "12"
          }
        }
      ],
      "propertyStorageProviders": {}
    },
    {
      "$id": "13",
      "activityId": "bbca4608-e55f-4d81-a87d-f2c10b336f58",
      "type": "WriteHttpResponse",
      "displayName": "HTTP Response",
      "persistWorkflow": false,
      "loadWorkflowContext": false,
      "saveWorkflowContext": false,
      "properties": [
        {
          "$id": "14",
          "name": "Content",
          "expressions": {
            "$id": "15",
            "Literal": "Hello World"
          }
        },
        {
          "$id": "16",
          "name": "ContentType",
          "expressions": {
            "$id": "17"
          }
        },
        {
          "$id": "18",
          "name": "StatusCode",
          "expressions": {
            "$id": "19"
          }
        },
        {
          "$id": "20",
          "name": "CharSet",
          "expressions": {
            "$id": "21"
          }
        },
        {
          "$id": "22",
          "name": "ResponseHeaders",
          "expressions": {
            "$id": "23"
          }
        }
      ],
      "propertyStorageProviders": {}
    }
  ],
  "connections": [
    {
      "$id": "24",
      "sourceActivityId": "06b927c7-be55-4958-97b5-ab84393eebc6",
      "targetActivityId": "bbca4608-e55f-4d81-a87d-f2c10b336f58",
      "outcome": "Done"
    }
  ],
  "id": "05f9f30ee43147b5b2edbb5f723f94d2"
}

ServiceCollectionExtensions.cs

using System;
using System.IO;
using Elsa.Persistence.EntityFramework.Core.Extensions;
using Elsa.Providers.Workflows;
using Elsa.Server.Hangfire.Extensions;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Storage.Net;

namespace DocumentManagement.Workflows.Extensions
{
    public static class ServiceCollectionExtensions
    {
        public static IServiceCollection AddWorkflowServices(this IServiceCollection services, Action<DbContextOptionsBuilder> configureDb)
        {
            return services.AddElsa(configureDb);
        }

        private static IServiceCollection AddElsa(this IServiceCollection services, Action<DbContextOptionsBuilder> configureDb)
        {
            services
                .AddElsa(elsa => elsa

                    // Use EF Core's SQLite provider to store workflow instances and bookmarks.
                    .UseEntityFrameworkPersistence(configureDb)
                    
                    // Use Console activities for testing & demo purposes.
                    .AddConsoleActivities()

                    // Use Hangfire to dispatch workflows from.
                    .UseHangfireDispatchers()

                    // Configure Email activities.
                    .AddEmailActivities()

                    // Configure HTTP activities.
                    .AddHttpActivities()
                );
            
            // Get directory path to current assembly.
            var currentAssemblyPath = Path.GetDirectoryName(typeof(ServiceCollectionExtensions).Assembly.Location);

            // Configure Storage for BlobStorageWorkflowProvider with a directory on disk from where to load workflow definition JSON files from the local "Workflows" folder.
            services.Configure<BlobStorageWorkflowProviderOptions>(options => options.BlobStorageFactory = () => StorageFactory.Blobs.DirectoryFiles(Path.Combine(currentAssemblyPath, "Workflows")));
            
            return services;
        }
    }
}