internal override void Restore(WorkflowSnapshot snapshot)
{
if (snapshot != Context.CurrentSnapshot)
{
throw new InvalidOperationException("Can not restore paused engine with different snapshot. Create a new instance instead!");
}
}
internal void ExecutePause()
{
// Create snapshot with workplan name
var snapShot = new WorkflowSnapshot {
WorkplanName = ExecutedWorkflow.Workplan.Name
};
// Pause all places or transitions with tokens
foreach (var holder in GetAllHolders().Where(IsRelevantHolder))
{
holder.Pause();
}
// Await all transitions to finish up currently executed code
while (ExecutedWorkflow.Transitions.Any(transition => transition.Executing))
{
// This will force a context switch to give CPU time to the transitions
Thread.Sleep(1);
}
// Extract snapshot from holders
snapShot.Holders = (from holder in GetAllHolders()
let tokens = holder.Tokens.ToArray()
where tokens.Length > 0
select new HolderSnapshot
{
HolderId = holder.Id,
Tokens = tokens,
HolderState = holder.InternalState
}).ToArray();
CurrentSnapshot = snapShot;
}
/// <summary>
/// Restore the workflow state from a snapshot
/// </summary>
/// <param name="snapshot"></param>
public void Restore(WorkflowSnapshot snapshot)
{
State.Restore(snapshot);
}
/// <summary>
/// Restore the workflow from a snapshot
/// </summary>
internal virtual void Restore(WorkflowSnapshot snapshot)
{
InvalidState();
}