public void Run()
{
wfHostTypeName = XName.Get("Version" + Guid.NewGuid().ToString(),
typeof(Workflow1).FullName);
this.instanceStore = SetupSqlpersistenceStore();
this.instanceHandle = CreateInstanceStoreOwnerHandle(
instanceStore, wfHostTypeName);
WorkflowApplication wfApp = CreateWorkflowApp();
wfApp.Run();
while (true)
{
this.waitHandler.WaitOne();
if (completed)
{
break;
}
WaitForRunnableInstance(this.instanceHandle);
wfApp = CreateWorkflowApp();
try
{
wfApp.LoadRunnableInstance();
waitHandler.Reset();
wfApp.Run();
}
catch (InstanceNotReadyException)
{
Console.WriteLine("Handled expected InstanceNotReadyException, retrying...");
}
}
Console.WriteLine("workflow completed.");
}
static void Main(string[] args)
{
SqlWorkflowInstanceStore store = new SqlWorkflowInstanceStore(persistenceConn);
// Create a unique name that is used to associate instances in the instance store hosts that can load them. This is needed to prevent a Workflow host from loading
// instances that have different implementations. The unique name should change whenever the implementation of the workflow changes to prevent workflow load exceptions.
// For the purposes of the demo we create a unique name every time the program is run.
XName wfHostTypeName = XName.Get("Version" + Guid.NewGuid().ToString(), typeof(Workflow1).FullName);
// Create an InstanceStore owner that is associated with the workflow type
InstanceHandle ownerHandle = CreateInstanceStoreOwner(store, wfHostTypeName);
// Create a WorkflowApplication instance to start a new workflow
WorkflowApplication wfApp = CreateWorkflowApplication(new Workflow1(), store, wfHostTypeName);
// This will create the workflow and execute it until the delay is executed, the workflow goes idle, and is unloaded
wfApp.Run();
// This loop handles re-loading workflows that have been unloaded due to durable timers
while (true)
{
// Wait for workflow to unload
workflowUnloadedEvent.WaitOne();
// Break the loop once the workflow has completed
if (workflowCompleted)
{
break;
}
// Wait for a timer registered by the delay to expire and the workflow instance to become "runnable" again
WaitForRunnableInstance(store, ownerHandle);
// Create a new WorkflowApplication instance to host the re-loaded workflow
wfApp = CreateWorkflowApplication(new Workflow1(), store, wfHostTypeName);
try
{
// Re-load the runnable workflow instance and run it
wfApp.LoadRunnableInstance();
workflowUnloadedEvent.Reset();
wfApp.Run();
}
catch (InstanceNotReadyException)
{
Console.WriteLine("Handled expected InstanceNotReadyException, retrying...");
}
}
Console.WriteLine("Sample finished, hit enter to close");
Console.ReadLine();
}
