// Save the workflow instance state at the point of persistence with option of locking the instance state if it is shared
// across multiple runtimes or multiple phase instance updates
protected override void SaveWorkflowInstanceState(Activity rootActivity, bool unlock)
{
// Save the workflow
Guid contextGuid = (Guid)rootActivity.GetValue(Activity.ActivityContextGuidProperty);
Console.WriteLine("Saving instance: {0}\n", contextGuid);
SerializeToFile(
WorkflowPersistenceService.GetDefaultSerializedForm(rootActivity), contextGuid);
// See when the next timer (Delay activity) for this workflow will expire
TimerEventSubscriptionCollection timers = (TimerEventSubscriptionCollection)rootActivity.GetValue(TimerEventSubscriptionCollection.TimerCollectionProperty);
TimerEventSubscription subscription = timers.Peek();
if (subscription != null)
{
// Set a system timer to automatically reload this workflow when its next timer expires
TimerCallback callback = new TimerCallback(ReloadWorkflow);
TimeSpan timeDifference = subscription.ExpiresAt - DateTime.UtcNow;
// check to make sure timeDifference is in legal range
if (timeDifference > FilePersistenceService.MaxInterval)
{
timeDifference = FilePersistenceService.MaxInterval;
}
else if (timeDifference < TimeSpan.Zero)
{
timeDifference = TimeSpan.Zero;
}
this.instanceTimers.Add(contextGuid, new System.Threading.Timer(
callback,
subscription.WorkflowInstanceId,
timeDifference,
new TimeSpan(-1)));
}
}
