/// <summary>
///
/// </summary>
/// <param name="engine"></param>
/// <param name="WorkflowFilePath"></param>
/// <param name="XsdPath"></param>
/// <returns></returns>
public Workflow CheckAndLoadWorkflow(CWFEngine engine, string WorkflowFilePath, string XsdPath)
{
_workflowMemento = new WorkflowMemento();
_workflowMemento.WorkflowFilePath = WorkflowFilePath;
_XsdPath = XsdPath;
Check();
var wf = Load(engine);
foreach (var activity in wf.Activities)
{
activity.Finished += wf.Activity_Finished;
}
return(wf);
}
public Workflow(CWFEngine cwfEngine, Parser.WorkflowMemento memento)
{
Description = memento.Description;
Id = memento.Id;
IsEnabled = memento.IsEnabled;
LaunchType = memento.LaunchType;
Name = memento.Name;
Period = memento.Period;
StateToken = memento.StateToken as INotifyPropertyChanged;
WorkflowFilePath = memento.WorkflowFilePath;
XmlNamespaceManager = memento.XmlNamespaceManager;
StateToken.PropertyChanged += StateToken_PropertyChanged;
Engine = cwfEngine;
_runningActivities = new ConcurrentDictionary <int, Task>();
_incomingTransitionsOfActivities = new ConcurrentDictionary <int, List <int> >();
_cancelationToken = CancellationSource.Token;
}
/// <summary>
///
/// </summary>
/// <param name="engine"></param>
/// <returns></returns>
Workflow Load(CWFEngine engine)
{
using (var xmlReader = XmlReader.Create(_workflowMemento.WorkflowFilePath))
{
var xmlNameTable = xmlReader.NameTable;
if (xmlNameTable != null)
{
_workflowMemento.XmlNamespaceManager = new XmlNamespaceManager(xmlNameTable);
_workflowMemento.XmlNamespaceManager.AddNamespace("wf", "urn:cwf-schema");
}
else
{
throw new Exception("xmlNameTable of " + _workflowMemento.WorkflowFilePath + " is null");
}
// Loading settings
var xdoc = XDocument.Load(_workflowMemento.WorkflowFilePath);
XDocument XDoc = xdoc;
XNamespaceWf = "urn:cwf-schema";
_workflowMemento.Id = int.Parse(GetWorkflowAttribute(xdoc, "id"));
_workflowMemento.Name = GetWorkflowAttribute(xdoc, "name");
_workflowMemento.Description = GetWorkflowAttribute(xdoc, "description");
_workflowMemento.LaunchType = (LaunchType)Enum.Parse(typeof(LaunchType), GetWorkflowSetting(xdoc, "launchType"), true);
if (_workflowMemento.LaunchType == LaunchType.Periodic)
{
_workflowMemento.Period = TimeSpan.Parse(GetWorkflowSetting(xdoc, "period"));
}
_workflowMemento.IsEnabled = bool.Parse(GetWorkflowSetting(xdoc, "enabled"));
//create state token
try
{
var typename = GetWorkflowSetting(xdoc, "statemachinetype");
_workflowMemento.StateToken = CreateStateToken(typename);
InitializeTransitionDefinitionBuilder(xdoc);
Logger.Info($"Instantiated State token");
}
catch (FileNotFoundException fnfe)
{
Logger.Error($"A required library was not found: {fnfe.FileName}");
}
catch (Exception e)
{
Logger.Error($"Exception on creating state machine token: {e.ToString()}");
return(null);
}
if (xdoc.Root != null)
{
var xExecutionGraph = xdoc.Root.Element(XNamespaceWf + Sym.ACTIVITY_SETUP);
IsExecutionGraphEmpty = xExecutionGraph == null || !xExecutionGraph.Elements().Any();
}
var wf = new Workflow(engine, _workflowMemento);
// Loading tasks
var activities = new List <Activity>();
foreach (var xTaskElement in xdoc.XPathSelectElements("/wf:Workflow/wf:Activities/wf:Activity", _workflowMemento.XmlNamespaceManager))
{
var xAttribute = xTaskElement.Attribute("name");
if (xAttribute != null)
{
var name = xAttribute.Value;
ActivityMemento activityMemento = ParseActivity(xTaskElement, wf);
Activity activity = LoadActivityInstance(name, activityMemento);
activities.Add(activity);
}
else
{
throw new Exception("Name attribute of the task " + xTaskElement + " does not exist.");
}
}
wf.Activities = activities.ToArray();
//read all transition definitions
var transitionList = new List <Transition>();
foreach (var xTaskElement in xdoc.XPathSelectElements("/wf:Workflow/wf:Transitions/wf:Transition", _workflowMemento.XmlNamespaceManager))
{
var xAttributeId = xTaskElement.Attribute("id");
var xAttributeFrom = xTaskElement.Attribute("from");
var xAttributeTo = xTaskElement.Attribute("to");
var xAttributeCondition = xTaskElement.Attribute("condition");
int id = int.Parse(xAttributeId.Value);
int from = int.Parse(xAttributeFrom.Value);
int to = int.Parse(xAttributeTo.Value);
string condition = xAttributeCondition?.Value;
var genericType = typeof(Transition <>).MakeGenericType(_stateType);
var transition = (Transition)Activator.CreateInstance(genericType, new object[] { id, from, to, condition });
OnTransitionDefinitionInXml(transition);
transitionList.Add(transition);
Logger.Info(transition.ToString());
}
wf.Transitions = transitionList.ToArray();
var d = CompileAndGetMethodInfos();
LinkTransitionsToCompiledConditions(wf.Transitions, d);
// Loading execution graph
var xExectionGraph = xdoc.XPathSelectElement("/wf:Workflow/wf:ActivitySetup", _workflowMemento.XmlNamespaceManager);
if (xExectionGraph != null)
{
var taskNodes = GetTaskNodes(xExectionGraph);
// Check startup node, parallel tasks and infinite loops
if (taskNodes.Any())
{
if (CheckStartupNode(taskNodes) == false)
{
Logger.Trace("Startup node with parentId=-1 not found in ExecutionGraph execution graph.");
throw new Exception();
}
}
if (CheckParallelTasks(taskNodes))
{
Logger.Trace("Parallel tasks execution detected in ExecutionGraph execution graph.");
}
CheckInfiniteLoop(taskNodes, "Infinite loop detected in ExecutionGraph execution graph.");
// OnSuccess
GraphEvent onSuccess = null;
var xOnSuccess = xExectionGraph.XPathSelectElement("wf:OnSuccess", _workflowMemento.XmlNamespaceManager);
if (xOnSuccess != null)
{
var onSuccessNodes = GetTaskNodes(xOnSuccess);
if (CheckStartupNode(onSuccessNodes) == false)
{
Logger.Trace("Startup node with parentId=-1 not found in OnSuccess execution graph.");
throw new Exception();
}
if (CheckParallelTasks(onSuccessNodes))
{
Logger.Trace("Parallel tasks execution detected in OnSuccess execution graph.");
}
CheckInfiniteLoop(onSuccessNodes, "Infinite loop detected in OnSuccess execution graph.");
onSuccess = new GraphEvent(onSuccessNodes);
}
// OnWarning
GraphEvent onWarning = null;
var xOnWarning = xExectionGraph.XPathSelectElement("wf:OnWarning", _workflowMemento.XmlNamespaceManager);
if (xOnWarning != null)
{
var onWarningNodes = GetTaskNodes(xOnWarning);
if (CheckStartupNode(onWarningNodes) == false)
{
Logger.Trace("Startup node with parentId=-1 not found in OnWarning execution graph.");
throw new Exception();
}
if (CheckParallelTasks(onWarningNodes))
{
Logger.Trace("Parallel tasks execution detected in OnSuccess execution graph.");
}
CheckInfiniteLoop(onWarningNodes, "Infinite loop detected in OnWarning execution graph.");
onWarning = new GraphEvent(onWarningNodes);
}
// OnError
GraphEvent onError = null;
var xOnError = xExectionGraph.XPathSelectElement("wf:OnError", _workflowMemento.XmlNamespaceManager);
if (xOnError != null)
{
var onErrorNodes = GetTaskNodes(xOnError);
if (CheckStartupNode(onErrorNodes) == false)
{
Logger.Trace("Startup node with parentId=-1 not found in OnError execution graph.");
return(null);
}
if (CheckParallelTasks(onErrorNodes))
{
Logger.Trace("Parallel tasks execution detected in OnError execution graph.");
}
CheckInfiniteLoop(onErrorNodes, "Infinite loop detected in OnError execution graph.");
onError = new GraphEvent(onErrorNodes);
}
wf.ActivitySetup = new Graph(taskNodes, onSuccess, onWarning, onError);
}
return(wf);
}
}
