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The documentation is published here.

Jasper is a next generation application development framework for distributed server side development in .Net. At the moment, Jasper can be used as:

  1. An in-memory command runner
  2. A robust, but lightweight asynchronous messaging framework (call it a service bus if you have to, but know that there's no centralized broker)
  3. An alternative for authoring HTTP services within ASP.Net Core
  4. A dessert topping (just kidding)

In all cases, Jasper can be used by itself or as an addon to an ASP.Net Core application. As much as possible, Jasper tries to leverage existing ASP.Net Core infrastructure.

Working with the Code

The official build script for Jasper uses Rake, but you're perfectly able to just fire up Visual Studio.Net, Rider, or VS Code and start working. In its current form, all the integration tests, including the Storyteller specifications, require Docker to be running on your developement machine.

To run the rake script, you'll need to have Ruby installed and Docker running on your application. Assuming you have that, go to the command line and type:

  1. bundle install (only the first time)
  2. rake or if you have version conflicts with other projects on your machine (boo), use bundle exec rake

This script will build the client side Javascript assets, restore .Net dependencies, execute the xUnit tests, and run the Storyteller specifications.

Unit Test Organization

The unit tests for the main Jasper library are actually broken up into three separate projects:

  1. CoreTests for any common functionality, mostly related to bootstrapping and IoC registrations
  2. HttpTests for any functionality related to the HTTP API support
  3. MessagingTests for any functionality specific to the asynchronous messaging or using Jasper as an in-memory service bus

Working with the Integration Tests

If you use the Rake script, you can execute the tests for all the persistence extensions and Rabbit MQ directly by using:

rake integrationtests

If you don't want to use Rake, from a command line you need to run this at least once before executing any of the testing libraries that depend on Postgresql, Sql Server, or Rabbit MQ:

docker-compose up -d

Working with the Storyteller Specifications

See the section on Integration Tests above for directions on using Docker.

If you're okay using the rake script, just use the rake open_st task to start and launch the Storyteller specification editor. rake storyteller will run the specifications from a command line if you only need to see results. The command rake storyteller will likewise run the specification suite from the command line.

If you don't want to use rake, go to the src/StorytellerSpecs folder at the command line and type dotnet storyteller.


The documentation is built and published with dotnet stdocs. The actual content is in this repository in the "/documentation" folder, but the finished HTML docs will be published to gh-pages in the repository.

To run the documentation website for the Jasper docs, use the rake docs task, or if you're not a Ruby fan, from the root directory of the repository, do dotnet restore && dotnet stdocs run.

To publish the documentation, there is a separate rake publish task that exports the compiled HTML code and pushes that to the Github repository for Jasper. Note that you will have to have push rights to the repository.

Running Benchmarks

There is some rudimentary benchmarks exposed through BenchmarkDotNet in the src/benchmarks project. To run the benchmarks, go to the command line at the src/benchmarks folder and just run dotnet run -c Release to execute all of the benchmarks.

What's with the name?

I think that FubuMVC turned some people off by its name ("for us, by us"). This time around I was going for an unassuming name that was easy to remember and just named it after my (Jeremy) hometown (Jasper, MO).

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