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UK p&p Summit Day 3: Wojtek Kozaczynski talks about Shadowfax
Wojtek, Architect with the Platform Architecture Group at Microsoft, gave a presentation this morning on Shadowfax, a reference implementation (based around the use cases of a "Global Bank") and framework for building service-oriented systems.
Shadowfax consists of the Enterprise Development Application Framework (EDAF), which he spent much of the time discussing and dissecting, as well as a reference implementation that uses it, based around the use cases that a major bank, suffering from multiple acquisitions in the last year, might need to deal with. A single Shadowfax-based service fronts the legacy systems, providing a unified access point to clients. Each legacy system from the acquired partners then becomes a service behind the scenes.
The 4 goals Wojtek laid out for EDAF are to:
- "separate the service interface from the service implementation"
- "separate business logic from cross-cutting concerns such as logging, monitoring, or raising business events"
- "separate business logic from the underlying transport"
- "develop stable service interfaces to ensure the resiliency of deployed services"
The basic framework is one that appears over and over again, a pipeline of interceptors (Handlers) that work collectively to handle a particular request targeted at a particular Target. In many respects, this architecture is very similar to that of other pipeline-based systems before it, like ASP.NET or .NET Remoting. The framework listens for incoming requests (across any of the channels configured to listen for incoming requests), creates a Context object that contains the details of the message, identifies the request target, and fires it down the pipeline, handling any exceptions that occur as a result and marshaling the response back to the client.
As might be expected, Shadowfax comes "out of the box" with a number of Handlers already written to perform classic interception-style behaviors, such as
- ClientTrace: Returns a trace of request execution
- AuthorizationDatabase: Do custom authorization
- DuplicateHandling: Detect and handle retry requests to the same target
- AppInstrumentationExecutionTime: Track the time required to execute the request from "this" point forward
- AuthenticationIdentity: Trust user credentials and associate them with the current thread
- AuthenticationInfrastructure: Test the credentials passed in as part of the request
- AuthorizationInfrastructure: Do role-based tests
- Transaction: Start a new COM+ transaction
- And more
Readers from the www.theserverside.com (the Java portal) will recognize many of these issues, as well as the design used within the framework as a whole, as a familiar one: it's been reused many places, including JAX-RPC, CORBA, the JBoss application server, and so on. Similarly, .NET Remoting had a similar architecture, and COM+ works similarly (based on Interception).
Shadowfax is about ready for general 1.0 release; keep an eye on the Shadowfax GotDotNet project page for details.
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Message #126256
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Excited about Shadowfax
I am really looking forward to seeing Shadowfax, and the coverage that it will get.
As always, hopefully, people will pick apart the implementation and we will all learn from it.
We have to remember that this is a reference application though, so not to go too crazy!
Dion
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Message #126325
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Reading Patterns & Practices Summit
Just wanted to say that I really enjoyed the summit over the last three days. I feel like I took away alot of new ideas and approaches towards software development as a whole.
I am certainly going to make more of an effort to get involved in the online communities that have formed around .NET and Java software development.
Cheers guys
Dan
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Message #126440
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Excited about Shadowfax
The nice thing about this project all along has been its community-centric roots. Members of the workspace have followed along, posted feedback and been able to download, pick apart and customize the incremental alpha/beta drops all along the way. In fact, the Shadowfax owners have been very proactive in encouraging custom implementations and extensions of the work they've been doing in order to gain alternate sets of feedback from their community.
IMO - This community vetting process for a .NET project has been almost as significant as the project's work itself. I too look forward to the general release material.
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Message #127531
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Framework for SO Systems
Hi Ted -
I just wanted to make a slight correction to your introduction. Indigo will be Microsoft's framework for building serviced-oriented systems not the EDAF.
The EDAF is a framework that will make developers of enterprise class distributed applications more productive. Business logic is written independent of transports and cross cutting concerns.
You can of course SO style applications using this framework and the ASMX service interface - just as you can with ASMX. The difference is of course that hopefully you are able to build them in a more productive manner - with a consistent level of quality.
Thanks
Jason Hogg
Program Manager
patterns and practices
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