public void Start(IWorkflowInstance workflowInstance)
{
if (workflowInstance.Started)
{
LogAndThrow(new WorkflowInstanceAlreadyStartedException(string.Format("Workflow instance '{0}' has already been started", workflowInstance.Id)));
}
workflowInstance.Started = true;
var startTasks = workflowInstance.Tasks.Where(task => task.IsStartTask).ToList();
if (startTasks.Count == 0)
{
LogAndThrow(new WorkflowInstanceHasNoStartTaskException(string.Format("Workflow instance '{0}' does not have a start task", workflowInstance.Id)));
}
if (startTasks.Count > 1)
{
LogAndThrow(new WorkflowInstanceHasTooManyStartTasksException(string.Format("Workflow instance '{0}' has more than one start task", workflowInstance.Id)));
}
workflowInstance.StartTime = DateTime.Now;
workflowInstance.CurrentTask = startTasks[0];
if (workflowInstance.CurrentTask is IDelayWorkflowTask)
{
((IDelayWorkflowTask)workflowInstance.CurrentTask).StartTime = DateTime.Now;
}
TheWorkflowInstanceRepository.Update(workflowInstance);
}
private bool Run()
{
var workflowInstances = TheWorkflowInstanceRepository.List();
var actions = 0;
foreach (var workflowInstance in workflowInstances)
{
var hydratedInstance = TheWorkflowInstanceRepository.RestoreState(workflowInstance);
if (hydratedInstance.Ended)
{
Log.Debug(string.Format("Ending workflow '{0}' and removing from runtime.", hydratedInstance.Id.ToString(CultureInfo.InvariantCulture)));
TheWorkflowInstanceRepository.Delete(hydratedInstance);
}
var task = hydratedInstance.CurrentTask;
if (task == null)
{
continue;
}
Log.Debug(string.Format("Checking task '{0}' for runnable", task.Name));
if (task is IRunnableWorkflowTask)
{
try
{
((IRunnableWorkflowTask)task).Run(hydratedInstance, this);
actions++;
}
catch (System.Exception ex)
{
Log.Error("An error occured during a runnable task (workflow will terminate) - " + task.GetType().FullName, ex);
Log.Error(ex.StackTrace);
EndWorkflow(hydratedInstance);
TheWorkflowInstanceRepository.Update(hydratedInstance);
actions++;
}
}
else if (task is IDelayWorkflowTask)
{
if (((IDelayWorkflowTask)task).IsComplete())
{
Log.Debug("Delay task completed");
Transition(hydratedInstance, task, task.AvailableTransitions[0]);
actions++;
}
}
else if (task is EndWorkflowTask || typeof(EndWorkflowTask) == task.GetType())
{
Log.Debug(string.Format("Workflow {0} will end as it entered an end task", hydratedInstance.Id));
EndWorkflow(hydratedInstance);
TheWorkflowInstanceRepository.Update(hydratedInstance);
actions++;
}
}
return(actions > 0);
}
public IWorkflowInstance Instantiate(int workflowConfigurationId, string comment)
{
var workflowInstance = Instantiate(workflowConfigurationId);
workflowInstance.Comment = comment;
Log.Info(string.Format("Instantiation comment for '{0}' '{1}' -> '{2}'", workflowInstance.Name, workflowInstance.Id, comment));
TheWorkflowInstanceRepository.Update(workflowInstance);
return(workflowInstance);
}
public void Transition(IWorkflowInstance workflowInstance, IWorkflowTask workflowTask, string transitionName, string comment)
{
if (workflowTask.Transitions.Values.Count == 0)
{
Log.Warn(string.Format("Ending workflow '{0}' as it has no transitions.", workflowInstance.Id));
EndWorkflow(workflowInstance);
TheWorkflowInstanceRepository.Update(workflowInstance);
return;
}
if (!workflowTask.Transitions.ContainsKey(transitionName))
{
LogAndThrow(new WorkflowTaskInvalidTransitionException(string.Format("Inavlid transition '{0}' for task '{1}'", transitionName, workflowTask.Name)));
}
var transitionGuid = workflowTask.Transitions[transitionName];
var transitionTask = workflowInstance.Tasks.SingleOrDefault(task => task.Id == transitionGuid);
if (transitionTask == null)
{
LogAndThrow(new WorkflowTaskInvalidTransitionException(string.Format("Can't transition to task '{0}' in workflow '{1}' as it is not found", transitionGuid.ToString(), workflowInstance.Id)));
}
Log.Info(string.Format("Transitioning workflow '{0}' - '{1}' from '{2}' to '{3}' using transition '{4}'", workflowInstance.Name, workflowInstance.Id, workflowInstance.CurrentTask.Name, transitionTask.Name, transitionName));
workflowInstance.TransitionHistory.Add(string.Format("{0} - Transition '{1}' - '{2}' -> '{3}' {4}", DateTime.Now, transitionName, workflowInstance.CurrentTask.Name, transitionTask.Name, comment));
workflowInstance.CurrentTask = transitionTask;
if (workflowInstance.CurrentTask is IDelayWorkflowTask)
{
((IDelayWorkflowTask)workflowInstance.CurrentTask).StartTime = DateTime.Now;
}
TheWorkflowInstanceRepository.Update(workflowInstance);
}
public void Update(IWorkflowInstance workflowInstance)
{
TheWorkflowInstanceRepository.Update(workflowInstance);
}