/// <summary>
/// Default implementation for the Workflow's Process method.
/// Get the current state
/// Invoke the corresponding action (with the data object passed in)
/// Add any results to the Item's SuggestionsList
/// Move to the next state and terminate the workflow if it is at the end
/// </summary>
/// <param name="instance">Workflow instance</param>
/// <param name="entity">Entity to process</param>
/// <param name="data">Extra data to pass to Activity</param>
/// <returns>true if completed, false if not</returns>
protected virtual WorkflowActivity.Status Process(WorkflowInstance instance, ServerEntity entity, object data)
{
try
{
// get current state and corresponding activity
TraceLog.TraceInfo(String.Format("Workflow {0} entering state {1}", instance.WorkflowType, instance.State));
WorkflowState state = States.Single(s => s.Name == instance.State);
//var activity = PrepareActivity(instance, state.Activity, UserContext, SuggestionsContext);
WorkflowActivity activity = null;
if (state.Activity != null)
{
activity = WorkflowActivity.CreateActivity(state.Activity);
}
else if (state.ActivityDefinition != null)
{
activity = WorkflowActivity.CreateActivity(state.ActivityDefinition, instance);
}
if (activity == null)
{
TraceLog.TraceError("Could not find or prepare Activity");
return(WorkflowActivity.Status.Error);
}
else
{
activity.UserContext = UserContext;
activity.SuggestionsContext = SuggestionsContext;
}
// invoke the activity
TraceLog.TraceInfo(String.Format("Workflow {0} invoking activity {1}", instance.WorkflowType, activity.Name));
var status = activity.Function.Invoke(instance, entity, data);
TraceLog.TraceInfo(String.Format("Workflow {0}: activity {1} returned status {2}", instance.WorkflowType, activity.Name, status.ToString()));
instance.LastModified = DateTime.Now;
// if the activity completed, advance the workflow state
if (status == WorkflowActivity.Status.Complete)
{
// store next state and terminate the workflow if next state is null
instance.State = state.NextState;
if (instance.State == null)
{
status = WorkflowActivity.Status.WorkflowDone;
TraceLog.TraceInfo(String.Format("Workflow {0} is done", instance.WorkflowType));
}
}
SuggestionsContext.SaveChanges();
return(status);
}
catch (Exception ex)
{
TraceLog.TraceException("Process failed", ex);
return(WorkflowActivity.Status.Error);
}
}