Workflow Core

Workflow Core is a light weight 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.

Documentation

See Tutorial here.

Fluent API

Define your workflows with the fluent API.

publicclassMyWorkflow:IWorkflow{publicvoidBuild(IWorkflowBuilder<MyData>builder){builder.StartWith<Task1>().Then<Task2>().Then<Task3>;}}

Sample use cases

• New user workflow

publicclassMyData{publicstringEmail{get;set;}publicstringPassword{get;set;}publicstringUserId{get;set;}}publicclassMyWorkflow:IWorkflow{publicvoidBuild(IWorkflowBuilder<MyData>builder){builder.StartWith<CreateUser>().Input(step =>step.Email, data =>data.Email).Input(step =>step.Password, data =>data.Password).Output(data =>data.UserId, step =>step.UserId);.Then<SendConfirmationEmail>().WaitFor("confirmation", data =>data.UserId).Then<UpdateUser>().Input(step =>step.UserId, data =>data.UserId);}}

• Resilient service orchestration

publicclassMyWorkflow:IWorkflow{publicvoidBuild(IWorkflowBuilder<MyData>builder){builder.StartWith<CreateCustomer>().Then<PushToSalesforce>().OnError(WorkflowErrorHandling.Retry,TimeSpan.FromMinutes(10)).Then<PushToERP>().OnError(WorkflowErrorHandling.Retry,TimeSpan.FromMinutes(10));}}

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
• SQL Server
• PostgreSQL
• Sqlite
• Redis (coming soon...)

Extensions

• User (human) workflows
• HTTP wrapper for Workflow Host Service

Samples

• Hello World

• Multiple outcomes

• Passing Data

• Parallel ForEach

• While Loop

• If Statement

• Events

• Parallel Tasks

• Dependency Injection

• Deferred execution & re-entrant steps

• Looping

• Exposing a REST API

• Human(User) Workflow

• Testing

Authors

• Daniel Gerlag - Initial work

Ports

• JWorkflow (Java)
• workflow-es (Node.js)
• workflow_rb (Ruby)

License

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