Workflow Core ------------- [](#workflow-core) [](https://ci.appveyor.com/project/danielgerlag/workflow-core) 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 [](#announcements) #### New related project: Conductor [](#new-related-project-conductor) 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](https://github.com/danielgerlag/conductor) Documentation ------------- [](#documentation) See [Tutorial here.](https://workflow-core.readthedocs.io) Fluent API ---------- [](#fluent-api) Define your workflows with the fluent API. public class MyWorkflow : IWorkflow { public void Build(IWorkflowBuilder builder) { builder .StartWith() .Then() .Then(); } } JSON / YAML Workflow Definitions -------------------------------- [](#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 [](#sample-use-cases) * New user workflow 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 public class MyWorkflow : IWorkflow { public void Build(IWorkflowBuilder builder) { builder .StartWith() .Then() .OnError(WorkflowErrorHandling.Retry, TimeSpan.FromMinutes(10)) .Then() .OnError(WorkflowErrorHandling.Retry, TimeSpan.FromMinutes(10)); } } builder .StartWith() .Saga(saga \=> saga .StartWith() .CompensateWith() .Then() .CompensateWith() .Then() .CompensateWith() ) .OnError(Models.WorkflowErrorHandling.Retry, TimeSpan.FromMinutes(10)) .Then(); Persistence ----------- [](#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](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Persistence.MongoDB) * [Amazon DynamoDB](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Providers.AWS) * [SQL Server](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Persistence.SqlServer) * [PostgreSQL](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Persistence.PostgreSQL) * [Sqlite](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Persistence.Sqlite) * [MySQL](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Persistence.MySQL) * [Redis](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Providers.Redis) Search ------ [](#search) 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](https://github.com/pbros/workflow-core/blob/master/src/providers/WorkflowCore.Providers.Elasticsearch) Extensions ---------- [](#extensions) * [User (human) workflows](https://github.com/pbros/workflow-core/blob/master/src/extensions/WorkflowCore.Users) Samples ------- [](#samples) * [Hello World](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample01) * [Multiple outcomes](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample12) * [Passing Data](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample03) * [Parallel ForEach](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample09) * [While Loop](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample10) * [If Statement](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample11) * [Events](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample04) * [Parallel Tasks](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample13) * [Saga Transactions (with compensation)](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample17) * [Scheduled Background Tasks](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample16) * [Recurring Background Tasks](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample14) * [Dependency Injection](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample15) * [Deferred execution & re-entrant steps](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample05) * [Looping](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample02) * [Exposing a REST API](https://github.com/pbros/workflow-core/blob/master/src/samples/WebApiSample) * [Human(User) Workflow](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.Sample08) * [Testing](https://github.com/pbros/workflow-core/blob/master/src/samples/WorkflowCore.TestSample01) Contributors ------------ [](#contributors) * **Daniel Gerlag** - _Initial work_ * **Jackie Ja** * **Aaron Scribner** * **Roberto Paterlini** Related Projects ---------------- [](#related-projects) * [Conductor](https://github.com/danielgerlag/conductor) (Stand-alone workflow server built on Workflow Core) Ports ----- [](#ports) * [JWorkflow (Java)](https://github.com/danielgerlag/jworkflow) * [workflow-es (Node.js)](https://github.com/danielgerlag/workflow-es) * [liteflow (Python)](https://github.com/danielgerlag/liteflow) License ------- [](#license) This project is licensed under the MIT License - see the [LICENSE.md](https://github.com/pbros/workflow-core/blob/master/LICENSE.md) file for details

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