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Programming language: C#
Tags: Scheduling    
Latest version: v3.1.0

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README

Workflow Core

Build status

Workflow Core is a light weight embeddable workflow engine targeting .NET Standard. Think: long running processes with multiple tasks that need to track state. It supports pluggable persistence and concurrency providers to allow for multi-node clusters.

Announcements

Conductor is a stand-alone workflow server as opposed to a library that uses Workflow Core internally. It exposes an API that allows you to store workflow definitions, track running workflows, manage events and define custom steps and scripts for usage in your workflows.

https://github.com/danielgerlag/conductor

Documentation

See Tutorial here.

Fluent API

Define your workflows with the fluent API.

public class MyWorkflow : IWorkflow
{
    public void Build(IWorkflowBuilder<MyData> builder)
    {    
        builder
           .StartWith<Task1>()
           .Then<Task2>()
           .Then<Task3>();
    }
}

JSON / YAML Workflow Definitions

Define your workflows in JSON or YAML

{
  "Id": "HelloWorld",
  "Version": 1,
  "Steps": [
    {
      "Id": "Hello",
      "StepType": "MyApp.HelloWorld, MyApp",
      "NextStepId": "Bye"
    },        
    {
      "Id": "Bye",
      "StepType": "MyApp.GoodbyeWorld, MyApp"
    }
  ]
}
Id: HelloWorld
Version: 1
Steps:
- Id: Hello
  StepType: MyApp.HelloWorld, MyApp
  NextStepId: Bye
- Id: Bye
  StepType: MyApp.GoodbyeWorld, MyApp

Sample use cases

  • New user workflow ```c# public class MyData { public string Email { get; set; } public string Password { get; set; } public string UserId { get; set; } }

public class MyWorkflow : IWorkflow { public void Build(IWorkflowBuilder builder) {
builder .StartWith() .Input(step => step.Email, data => data.Email) .Input(step => step.Password, data => data.Password) .Output(data => data.UserId, step => step.UserId) .Then() .WaitFor("confirmation", data => data.UserId) .Then() .Input(step => step.UserId, data => data.UserId); } }


* Saga Transactions

```c#
public class MyWorkflow : IWorkflow
{
    public void Build(IWorkflowBuilder<MyData> builder)
    {    
        builder
            .StartWith<CreateCustomer>()
            .Then<PushToSalesforce>()
                .OnError(WorkflowErrorHandling.Retry, TimeSpan.FromMinutes(10))
            .Then<PushToERP>()
                .OnError(WorkflowErrorHandling.Retry, TimeSpan.FromMinutes(10));
    }
}
builder
    .StartWith<LogStart>()
    .Saga(saga => saga
        .StartWith<Task1>()
            .CompensateWith<UndoTask1>()
        .Then<Task2>()
            .CompensateWith<UndoTask2>()
        .Then<Task3>()
            .CompensateWith<UndoTask3>()
    )
    .OnError(Models.WorkflowErrorHandling.Retry, TimeSpan.FromMinutes(10))
    .Then<LogEnd>();

Persistence

Since workflows are typically long running processes, they will need to be persisted to storage between steps. There are several persistence providers available as separate Nuget packages.

  • MemoryPersistenceProvider (Default provider, for demo and testing purposes)
  • [MongoDB](src/providers/WorkflowCore.Persistence.MongoDB)
  • [Amazon DynamoDB](src/providers/WorkflowCore.Providers.AWS)
  • [SQL Server](src/providers/WorkflowCore.Persistence.SqlServer)
  • [PostgreSQL](src/providers/WorkflowCore.Persistence.PostgreSQL)
  • [Sqlite](src/providers/WorkflowCore.Persistence.Sqlite)
  • [MySQL](src/providers/WorkflowCore.Persistence.MySQL)
  • [Redis](src/providers/WorkflowCore.Providers.Redis)

A search index provider can be plugged in to Workflow Core, enabling you to index your workflows and search against the data and state of them. These are also available as separate Nuget packages.

  • [Elasticsearch](src/providers/WorkflowCore.Providers.Elasticsearch)

Extensions

  • [User (human) workflows](src/extensions/WorkflowCore.Users)

Samples

  • [Hello World](src/samples/WorkflowCore.Sample01)

  • [Multiple outcomes](src/samples/WorkflowCore.Sample12)

  • [Passing Data](src/samples/WorkflowCore.Sample03)

  • [Parallel ForEach](src/samples/WorkflowCore.Sample09)

  • [While Loop](src/samples/WorkflowCore.Sample10)

  • [If Statement](src/samples/WorkflowCore.Sample11)

  • [Events](src/samples/WorkflowCore.Sample04)

  • [Activity Workers](src/samples/WorkflowCore.Sample18)

  • [Parallel Tasks](src/samples/WorkflowCore.Sample13)

  • [Saga Transactions (with compensation)](src/samples/WorkflowCore.Sample17)

  • [Scheduled Background Tasks](src/samples/WorkflowCore.Sample16)

  • [Recurring Background Tasks](src/samples/WorkflowCore.Sample14)

  • [Dependency Injection](src/samples/WorkflowCore.Sample15)

  • [Deferred execution & re-entrant steps](src/samples/WorkflowCore.Sample05)

  • [Looping](src/samples/WorkflowCore.Sample02)

  • [Exposing a REST API](src/samples/WebApiSample)

  • [Human(User) Workflow](src/samples/WorkflowCore.Sample08)

  • [Testing](src/samples/WorkflowCore.TestSample01)

Contributors

  • Daniel Gerlag - Initial work
  • Jackie Ja
  • Aaron Scribner
  • Roberto Paterlini
  • Conductor (Stand-alone workflow server built on Workflow Core)

Ports

License

This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details


*Note that all licence references and agreements mentioned in the Workflow Core README section above are relevant to that project's source code only.