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Transformation routines finished

Posted by Philipp Liegl on July 2, 2010 in Uncategorized

News from the engine room:

We are happy to announce that the transformer for deriving Microsoft Windows Workflow artifacts from local choreographies is finished. We are currently integrating the transformation routines in the BSopt designer.

New BSopt tool project available!

Posted by Thomas Motal on April 29, 2010 in BSopt Designer

The BSopt Designer is a graphical modeling tool supporting the BSopt (Business Semantics on top of Process Technology) methodology. It offers an integrated guidance approach starting from business models over business process models down to executable deployment artifacts for a SOA (service-oriented architecture).

It has recently been published as an open-source project and is hosted on Google Code. The project website acts as a central information repository where you can find current information about the BSopt modeling tool. For more information visit the BSopt Designer website.

How to debug an isolated shell

Posted by Thomas Motal on April 15, 2010 in BSopt Designer

When debugging an isolated shell be aware of the debugging configuration of your shell project. The default configuration do not allow to load managed packages (only native symbols are loaded). To enable debugging the configuration has to be changed to “Mixed” (instead of “Auto”) [1].

Steps to accomplish:

  1. Open the properties for your shell project
  2. Go to Configuration Properties -> Debugging Option
  3. Change the Debugger Type property to “Mixed”

This should solve the issue!

References:

BSopt Designer using Isolated Shell and Wizards

Posted by Dieter Mayrhofer on April 6, 2010 in BSopt Designer

In order to create our BSopt Designer we decided to build upon the Microsoft Visual Studio 2008 Isolated Shell and integrated wizards. The Isolated Shell represents the core of the Visual Studio IDE and can be extended with various packages to add additional functionality and features. It can then be distributed as a stand-alone application. The user only has to install the application as well as the Visual Studio 2008 Shell (isolated mode) with Service Pack 1 Redistributable Package. The 132 MB big Redistributable Package can be downloaded for free from the Microsoft homepage and includes the core functionality of the IDE.

The BSopt Designer itself can be installed with a simple Windows Installer and includes all the additional features for the BSopt approach. These features include various model Languages (Domain Specific Languages - DSL) and several wizards helping the user to create his models.

The following figure shows the BSopt Designer:

A big advantage of the Isolated Shell approach is, that we do not have to implement basic features like adding new files or copy/paste functionality and that we do not have to install each DSL separately. They are all included in the installation package.

In order to guide the user through the modeling process we provide several wizards to create models and deployment artifacts. These Wizards can be called by right-clicking on an appropriate Item in the file list. Following you can see the Wizard for generating Entities and there states based on the e3-value models:

These wizards help the user to generate models out of the related parent models and serve as a basis for refining them. As for the development of the Wizards we used a powerful wizard framework for .Net 2.0 called WizardControl.

A great tutorial showing how to extend an Isolated Shell with DSLs and custom commands can be found at Christian Baekdorf’s Blog.

Self hosting workflows again with Workflow Foundation 4 Beta 1

Posted by mtopf on August 8, 2009 in Uncategorized

Hi, my name is Mario and one of my responsibilities in the Bsopt project is to generate workflows out of a global choreography handed down to me from other layers of the system. Just recently Microsoft has released the first public beta of the upcoming Dot Net Framework 4 and one of the many new features in it is the reintroduction of the Windows Workflow Foundation (”WF”) which basically is a complete rewrite residing in new dedicated assemblies and namespaces. Of course I had a look into the new technology and into the possibilities for our project! This post will be about a very specific problem you might face when creating applications with “self hosted workflows” – executables which are listening on one or more endpoints for incoming messages and might create new workflow instances for specific messages received. Self hosting a workflow by itself is quite a straightforward task as the creators of the Dot Net Framework 3.5 started including a WorkflowServiceHost class to manage all the gritty details for you. Be aware though: Workflow Foundation Versions 3.5 and 4 each got their own WorkflowServiceHost class which must not be confused with each other:

class WorkflowServiceHost

WF 3.5

WF 4

Namespace:

System.ServiceModel

System.ServiceModel.Activities

Assembly:

System.WorkflowServices (in System.WorkflowServices.dll)

System.ServiceModel.Activities (in System.ServiceModel.Activities.dll)

In both versions the code for self hosting workflows which will be created when receiving an incoming message is straight forward:

using (WorkflowServiceHost sh = new
WorkflowServiceHost(workflowType))
{
sh.Open();
WriteLine(ConsoleColor.Cyan, “Now selfhosting a workflow service. Press enter to quit.”);
Console.ReadLine();
sh.Close();
}

There might be occasions when this approach is not enough though. The above code example would only work if the workflow used here would start with a Receive activity. If workflows need to do something else before listening for incoming messages we have to start instances ourselves. In WF 3.5 it was done this way:

AutoResetEvent are = new
AutoResetEvent(false);

using (WorkflowServiceHost sh = new
WorkflowServiceHost(workflowType))
{
WorkflowRuntimeBehavior wfBehavior = sh.Description.Behaviors.Find<System.ServiceModel.Description.WorkflowRuntimeBehavior>();
WorkflowRuntime runtime = wfBehavior.WorkflowRuntime;
sh.Open();
WorkflowInstance instance = runtime.CreateWorkflow(workflowType);
runtime.WorkflowCompleted += (sender, e) => { WriteLine(ConsoleColor.Cyan, “Workflow completed.”);are.Set();};
runtime.WorkflowAborted += (sender, e) => { WriteLine(ConsoleColor.Red, “Workflow aborted.”); are.Set(); };
instance.Start();
WriteLine(ConsoleColor.Cyan, “Now hosting sender service.”);
are.WaitOne();
sh.Close();
}

The WorkflowServiceHost itself was not exposing the WorkflowRuntime class. Fortunately we were able to retrieve a WorkflowRuntimeBehavior instance from the service host’s Description property. Using this instance we were able to retrieve the actual WorkflowRuntime used by the service host and finally create and start a new WorkflowInstance for our workflow. Note that this is also a nice way to manipulate the services exposed by the WorkflowRuntime but it can also be done declaratively. So with WF4 and its dedicated WorkflowServiceHost can we do just the same? Unfortunately it’s not that easy. The problem is, that in Workflow Foundation 4 there no longer is a central runtime instance and we’re not given any workflow runtime behavior. Thus for quite some time I didn’t know how to reproduce the WF 3.5 behavior with WF 4. Then when reading through the very recommended WF 4 Migration Guidance documents, especially the file “WF4 Workflow Services Guidance.docx” I noticed how to regain control again:

We use the notion of a control endpoint: a web service endpoint that we add to WorkflowServiceHost, which can control the execution of the underlying workflow instance. This is a regular endpoint that can receive messages from external callers, or can be called locally by the client itself. The following code snippet shows how this is done. The code relies on the IWorkflowControlService interface, which is available in the Conversations solution which accompanies this paper.

System.ServiceModel.Activities.WorkflowServiceHost host = new System.ServiceModel.Activities.WorkflowServiceHost( /* omitted for brevity */);

// Add control endpoint to start client WorkflowControlEndpoint localEndpoint = new WorkflowControlEndpoint(); host.AddServiceEndpoint(localEndpoint);

host.Open(); IWorkflowControlService client = new ChannelFactory<IWorkflowControlService>(localEndpoint.Binding, localEndpoint.Address).CreateChannel();

client.Run(client.Create(null));

That’s it! The dedicated WorkflowControlEndpoint exposes functionality for us to create new workflows, run those and actually much more. Unfortunately the IWorkflowControlService interface is not publicly exposed in the Dot Net Framework and the Conversations solution has not - at time of this writing - been released to the public. Fortunately we’re not dependent on this source code as we can just generate this interface ourselves! As a Dot Net Reflector instance was opened at the time I was reading this I just looked at the WorkflowServiceHost class to see which functionality it was exposing.
Easy enough I found out that the default base URI for this endpoint is “net.local://workflowControlServiceEndpoint” and that the interface I was looking for basically was internal interface System.ServiceModel.Activities.IWorkflowControlServiceInternal. By copy pasting this data into my code I had just what I wanted and I finally was able to start self hosted workflows again in WF4!
Note that in my opinion the proper way to do this would be to declare the WorkflowControlEndpoint with a known local endpoint address, make sure to publish metadata for the exposed service and infer the interface e.g. using Visual Studio’s Add Service Reference functionality but I didn’t try this approach myself after what I got was working out.

To spare you the work of inferring the workflow control interface I’ll end my post by pasting the code for you to use in your own self hosted WF4 services!

[ServiceContract(Name = “IWorkflowControlService”, Namespace = “http://schemas.datacontract.org/2008/10/WorkflowServices”),

System.ServiceModel.Activities.Description.WorkflowContractBehavior]

internal
interface
IWorkflowControlService

{


// Methods

[OperationContract(Name = “Abandon”)]


void Abandon(Guid instanceId, string reason);

[OperationContract(Name = “Abandon”, AsyncPattern = true)]


IAsyncResult BeginAbandon(Guid instanceId, string reason, AsyncCallback callback, object state);

[OperationContract(Name = “Cancel”, AsyncPattern = true)]


IAsyncResult BeginCancel(Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “Create”, AsyncPattern = true)]


IAsyncResult BeginCreate(IDictionary<string, object> inputs, AsyncCallback callback, object state);

[OperationContract(Name = “CreateWithInstanceId”, AsyncPattern = true)]


IAsyncResult BeginCreateWithInstanceId(IDictionary<string, object> inputs, Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “Run”, AsyncPattern = true)]


IAsyncResult BeginRun(Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “Suspend”, AsyncPattern = true)]


IAsyncResult BeginSuspend(Guid instanceId, string reason, AsyncCallback callback, object state);

[OperationContract(Name = “Terminate”, AsyncPattern = true)]


IAsyncResult BeginTerminate(Guid instanceId, string reason, AsyncCallback callback, object state);

[OperationContract(Name = “TransactedCancel”, AsyncPattern = true)]


IAsyncResult BeginTransactedCancel(Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “TransactedCreate”, AsyncPattern = true)]


IAsyncResult BeginTransactedCreate(IDictionary<string, object> inputs, AsyncCallback callback, object state);

[OperationContract(Name = “TransactedCreateWithInstanceId”, AsyncPattern = true)]


IAsyncResult BeginTransactedCreateWithInstanceId(IDictionary<string, object> inputs, Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “TransactedRun”, AsyncPattern = true)]


IAsyncResult BeginTransactedRun(Guid instanceId, AsyncCallback callback, object state);

[OperationContract(AsyncPattern = true, Name = “TransactedSuspend”)]


IAsyncResult BeginTransactedSuspend(Guid instanceId, string reason, AsyncCallback callback, object state);

[OperationContract(AsyncPattern = true, Name = “TransactedTerminate”)]


IAsyncResult BeginTransactedTerminate(Guid instanceId, string reason, AsyncCallback callback, object state);

[OperationContract(AsyncPattern = true, Name = “TransactedUnsuspend”)]


IAsyncResult BeginTransactedUnsuspend(Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “Unsuspend”, AsyncPattern = true)]


IAsyncResult BeginUnsuspend(Guid instanceId, AsyncCallback callback, object state);

[OperationContract(Name = “Cancel”)]


void Cancel(Guid instanceId);

[OperationContract(Name = “Create”)]


Guid Create(IDictionary<string, object> inputs);

[OperationContract(Name = “CreateWithInstanceId”)]


void CreateWithInstanceId(IDictionary<string, object> inputs, Guid instanceId);


void EndAbandon(IAsyncResult result);


void EndCancel(IAsyncResult result);


Guid EndCreate(IAsyncResult result);


void EndCreateWithInstanceId(IAsyncResult result);


void EndRun(IAsyncResult result);


void EndSuspend(IAsyncResult result);


void EndTerminate(IAsyncResult result);


void EndTransactedCancel(IAsyncResult result);


Guid EndTransactedCreate(IAsyncResult result);


void EndTransactedCreateWithInstanceId(IAsyncResult result);


void EndTransactedRun(IAsyncResult result);


void EndTransactedSuspend(IAsyncResult result);


void EndTransactedTerminate(IAsyncResult result);


void EndTransactedUnsuspend(IAsyncResult result);


void EndUnsuspend(IAsyncResult result);

[OperationContract(Name = “Run”)]


void Run(Guid instanceId);

[OperationContract(Name = “Suspend”)]


void Suspend(Guid instanceId, string reason);

[OperationContract(Name = “Terminate”)]


void Terminate(Guid instanceId, string reason);

[TransactionFlow(TransactionFlowOption.Allowed), OperationContract(Name = “TransactedCancel”)]


void TransactedCancel(Guid instanceId);

[TransactionFlow(TransactionFlowOption.Allowed), OperationContract(Name = “TransactedCreate”)]


Guid TransactedCreate(IDictionary<string, object> inputs);

[TransactionFlow(TransactionFlowOption.Allowed), OperationContract(Name = “TransactedCreateWithInstanceId”)]


void TransactedCreateWithInstanceId(IDictionary<string, object> inputs, Guid instanceId);

[OperationContract(Name = “TransactedRun”), TransactionFlow(TransactionFlowOption.Allowed)]


void TransactedRun(Guid instanceId);

[TransactionFlow(TransactionFlowOption.Allowed), OperationContract(Name = “TransactedSuspend”)]


void TransactedSuspend(Guid instanceId, string reason);

[OperationContract(Name = “TransactedTerminate”), TransactionFlow(TransactionFlowOption.Allowed)]


void TransactedTerminate(Guid instanceId, string reason);

[TransactionFlow(TransactionFlowOption.Allowed), OperationContract(Name = “TransactedUnsuspend”)]


void TransactedUnsuspend(Guid instanceId);

[OperationContract(Name = “Unsuspend”)]


void Unsuspend(Guid instanceId);

}

New master’s theses topics

Posted by Philipp Liegl on March 3, 2009 in Uncategorized

For students interested in writing their master’s thesis in the context of the BSopt project we have assembled a list of possible topcis.

Academic papers added

Posted by Philipp Liegl on August 24, 2008 in Uncategorized

New academic papers related to the research work conducted in the BSopt project have been added.

List of books available

Posted by Philipp Liegl on May 12, 2008 in Resources

As list of interesting books around the research questions of the BSopt project is available in the resource section.

Kick-Off meeting held in Halbturn

Posted by Philipp Liegl on April 15, 2008 in General

The BSopt Kick-Off meeting was held at the Kummer-Schuster vinery in Halbturn, Burgenland. All project participants attended the meeting and the first action items for the BSopt project were defined.

First price at the FIT-IT award for BSopt!

Posted by Thomas Motal on April 10, 2008 in General

The BSopt project proposal was awarded with the first price in the category Semantic Systems for the best project proposal submission in 2008.

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