void IDisposable.Dispose()
{
if (this.currentActivity != null)
{
if (this.contextManager != null)
{
this.contextManager.Dispose();
this.contextManager = null;
}
this.currentActivity = null;
}
}
private static void CollectCompensatableCompletedContexts(ActivityExecutionContext context, Activity targetActivity, SortedDictionary <int, CompensationInfo> sortedListOfCompensatableTargets, bool immediateCompensation)
{
ActivityExecutionContextManager executionContextManager = context.ExecutionContextManager;
for (int i = executionContextManager.CompletedExecutionContexts.Count - 1; i >= 0; i--)
{
ActivityExecutionContextInfo targetExecutionInfo = executionContextManager.CompletedExecutionContexts[i];
if (((byte)(targetExecutionInfo.Flags & PersistFlags.NeedsCompensation)) != 0)
{
Activity activityByName = targetActivity.GetActivityByName(targetExecutionInfo.ActivityQualifiedName, true);
if ((activityByName != null) && (!immediateCompensation || !IsActivityInBackWorkBranch(targetActivity, activityByName)))
{
sortedListOfCompensatableTargets.Add(targetExecutionInfo.CompletedOrderId, new CompensationInfo(targetExecutionInfo, executionContextManager));
}
}
}
}
private ActivityExecutionStatus CompensateTargetActivity(ActivityExecutionContext context)
{
Activity activityByName = null;
Activity activity2 = context.Activity;
do
{
activityByName = activity2.Parent.GetActivityByName(this.TargetActivityName, true);
}while (activityByName == null);
if (((activityByName is ICompensatableActivity) && (activityByName.ExecutionStatus == ActivityExecutionStatus.Closed)) && (activityByName.ExecutionResult == ActivityExecutionResult.Succeeded))
{
activityByName.RegisterForStatusChange(Activity.ClosedEvent, this);
context.CompensateActivity(activityByName);
return(context.Activity.ExecutionStatus);
}
if (activityByName.ExecutionStatus == ActivityExecutionStatus.Initialized)
{
ActivityExecutionContextManager executionContextManager = context.ExecutionContextManager;
foreach (ActivityExecutionContext context2 in executionContextManager.ExecutionContexts)
{
if ((activityByName.GetActivityByName(context2.Activity.QualifiedName, true) != null) && (((context2.Activity.ExecutionStatus == ActivityExecutionStatus.Compensating) || (context2.Activity.ExecutionStatus == ActivityExecutionStatus.Faulting)) || (context2.Activity.ExecutionStatus == ActivityExecutionStatus.Canceling)))
{
return(context.Activity.ExecutionStatus);
}
}
for (int i = executionContextManager.CompletedExecutionContexts.Count - 1; i >= 0; i--)
{
ActivityExecutionContextInfo contextInfo = executionContextManager.CompletedExecutionContexts[i];
if (((byte)(contextInfo.Flags & PersistFlags.NeedsCompensation)) != 0)
{
ActivityExecutionContext context3 = executionContextManager.DiscardPersistedExecutionContext(contextInfo);
if (context3.Activity is ICompensatableActivity)
{
context3.Activity.RegisterForStatusChange(Activity.ClosedEvent, this);
context3.CompensateActivity(context3.Activity);
}
return(context.Activity.ExecutionStatus);
}
}
}
else if (CompensationUtils.TryCompensateLastCompletedChildActivity(context, activityByName, this))
{
return(context.Activity.ExecutionStatus);
}
return(ActivityExecutionStatus.Closed);
}
// walk through active contexts that contain compensatable child, add them in the sorted order of the completion
// this also, walks through the completed contexts which are compensatable and are nested directly within the active contexts and adds them in the order of their completion
// bail out if any activity is currently compensating/faulting or cancelling
private static bool CollectCompensatableActiveContexts(ActivityExecutionContext context, Activity targetActivity, SortedDictionary <int, CompensationInfo> sortedListOfCompensatableTargets, bool immediateCompensation)
{
ActivityExecutionContextManager contextManager = context.ExecutionContextManager;
foreach (ActivityExecutionContext activeContext in contextManager.ExecutionContexts)
{
if (targetActivity.GetActivityByName(activeContext.Activity.QualifiedName, true) != null)
{
//Dont walk context which are part of reverse work.
if (immediateCompensation && IsActivityInBackWorkBranch(targetActivity, activeContext.Activity))
{
continue;
}
if (activeContext.Activity is ICompensatableActivity && (activeContext.Activity.ExecutionStatus == ActivityExecutionStatus.Compensating || activeContext.Activity.ExecutionStatus == ActivityExecutionStatus.Faulting || activeContext.Activity.ExecutionStatus == ActivityExecutionStatus.Canceling))
{
return(true);
}
else if (activeContext.Activity is CompositeActivity)
{
Activity[] activities = GetCompensatableChildren(activeContext.Activity as CompositeActivity);
if (activities != null)
{
int lastcompletedContextOrderId = 0;
foreach (Activity childActivity in activities)
{
int completedOrderId = (int)childActivity.GetValue(Activity.CompletedOrderIdProperty);
if (lastcompletedContextOrderId < completedOrderId)
{
lastcompletedContextOrderId = completedOrderId;
}
}
if (lastcompletedContextOrderId != 0)
{
sortedListOfCompensatableTargets.Add(lastcompletedContextOrderId, new CompensationInfo(activeContext));
}
}
CollectCompensatableActiveContexts(activeContext, targetActivity, sortedListOfCompensatableTargets, immediateCompensation);
CollectCompensatableCompletedContexts(activeContext, targetActivity, sortedListOfCompensatableTargets, immediateCompensation);
}
}
}
return(false);
}
// walk through all completed execution contexts which are compensatable and are directly nested under the target activity,
//and add them to our sorted list
private static void CollectCompensatableCompletedContexts(ActivityExecutionContext context, Activity targetActivity, SortedDictionary <int, CompensationInfo> sortedListOfCompensatableTargets, bool immediateCompensation)
{
// walk through all completed execution contexts, add them to our sorted list
ActivityExecutionContextManager contextManager = context.ExecutionContextManager;
for (int index = contextManager.CompletedExecutionContexts.Count - 1; index >= 0; index--)
{
//if the context does not have any compensatable children, continue
ActivityExecutionContextInfo completedActivityInfo = contextManager.CompletedExecutionContexts[index];
if ((completedActivityInfo.Flags & PersistFlags.NeedsCompensation) == 0)
{
continue;
}
//ok, found a compensatable child.
Activity completedActivity = targetActivity.GetActivityByName(completedActivityInfo.ActivityQualifiedName, true);
if (completedActivity != null && !(immediateCompensation && IsActivityInBackWorkBranch(targetActivity, completedActivity)))
{
sortedListOfCompensatableTargets.Add(completedActivityInfo.CompletedOrderId, new CompensationInfo(completedActivityInfo, contextManager));
}
}
}
internal ActivityExecutionContext(ActivityExecutionContextManager manager, Activity activity)
{
this.activity = activity;
this.manager = manager;
guid = Guid.NewGuid();
}
internal CompensationInfo(ActivityExecutionContextInfo targetExecutionInfo, ActivityExecutionContextManager targetExecutionContextManager)
{
this.targetExecutionInfo = targetExecutionInfo;
this.targetExecutionContextManager = targetExecutionContextManager;
}
internal CompensationInfo(ActivityExecutionContextInfo targetExecutionInfo, ActivityExecutionContextManager targetExecutionContextManager)
{
this.targetExecutionInfo = targetExecutionInfo;
this.targetExecutionContextManager = targetExecutionContextManager;
}
public void Start ()
{
WorkflowSchedulerService sheduler;
// init all activities
ActivityExecutionContextManager manager = new ActivityExecutionContextManager (this);
ActivityExecutionContext context = manager.CreateExecutionContext (GetWorkflowDefinition ());
GetWorkflowDefinition ().InitializeInternal (context);
sheduler = (WorkflowSchedulerService) runtime.GetService (typeof (WorkflowSchedulerService));
//sheduler.Schedule (new WaitCallback (WorkflowProcessor.RunWorkflow), guid);
WorkflowProcessor.RunWorkflow (guid);
}
// Workflow processor
internal static void RunWorkflow (Object stateInfo)
{
Stack <Activity> stack = new Stack <Activity> ();
WorkflowInstance wi = WorkflowRuntime.GetInstanceFromGuid ((Guid)stateInfo);
wi.timer_subscriptions = new Timer (TimerSubscriptionsCallback, wi, 0, 1000);
Activity activity = wi.GetWorkflowDefinition ();
Activity next_activity;
ActivityExecutionContextManager manager = new ActivityExecutionContextManager (wi);
ActivityExecutionContext context;
List <DelayActivity> waiting = new List <DelayActivity> ();
bool wait = false;
StateMachineWorkflowActivity state_machine = null;
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Initiating thread for activity {0}", wi.GetWorkflowDefinition ());
#endif
context = manager.CreateExecutionContext (activity);
// Main Workflow execution loop
while (activity != null) {
next_activity = null;
if (activity.NeedsExecution) {
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("*** Executing {0}, parallel {1}", activity, activity.ParallelParent);
#endif
context.ExecuteActivity (activity);
}
// If this a state machine changing its statge update StateMachineWorkflowActivity
if (state_machine != null && IsBasedOnType (activity, typeof (SetStateActivity))) {
state_machine.SetCurrentStateName (((SetStateActivity) activity).TargetStateName);
}
#if DEBUG_EXECUTIONLOOP
Console.WriteLine (" ActivitiesToExecute.Count {0}, stack {1}, waiting {2}",
activity.ActivitiesToExecute.Count, stack.Count, waiting.Count);
#endif
wait = false;
// State machine workflow, first activity is InitialStateName
if (IsBasedOnType (activity, typeof (StateMachineWorkflowActivity))) {
state_machine = (StateMachineWorkflowActivity) activity;
stack.Push (activity.GetActivityByName (state_machine.InitialStateName));
state_machine.SetCurrentStateName (state_machine.InitialStateName);
#if DEBUG_EXECUTIONLOOP
Console.WriteLine (" StateMachineWorkflowActivity, pushing {0}",
activity.GetActivityByName (sm.InitialStateName));
#endif
}
// TODO: if (IsBasedOnType (current, typeof (CompositeActivity))) {
if (activity.GetType () == typeof (DelayActivity)) {
if (activity.ParallelParent == null) {
wi.WorkflowRuntime.OnWorkflowIdled (wi);
waiting.Add ((DelayActivity) activity);
wait = true;
} else {
// Continue from parent activities
// TODO: This can be moved to the Execute method
// of the paralell activity
if (activity.ParallelParent.ActivitiesToExecute.Count > 0) {
stack.Push (activity.ParallelParent);
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Pushing parent {0}", activity.ParallelParent);
#endif
waiting.Add ((DelayActivity) activity);
} else { // If not possible, wait for the delay
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Schedule Waiting");
#endif
waiting.Add ((DelayActivity) activity);
wait = true;
}
}
}
if (activity.NeedsExecution) { // ex. While
stack.Push (activity);
}
if (activity.ActivitiesToExecute.Count == 0 && stack.Count == 0 && waiting.Count == 0) {
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Exiting...");
#endif
break;
}
// Does it have sub-activities to run?
// Delay is not composite, cannot have children activities
if (wait == false) {
if (activity.ActivitiesToExecute.Count > 0) {
next_activity = activity.ActivitiesToExecute.Dequeue ();
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Next Activity A {0}", next_activity);
#endif
if (activity.ActivitiesToExecute.Count > 0) {
stack.Push (activity);
}
} else {
if (stack.Count > 0) {
next_activity = stack.Pop ();
}
if (next_activity != null && next_activity.NeedsExecution == false) {
if (next_activity.ActivitiesToExecute.Count > 0) {
next_activity = next_activity.ActivitiesToExecute.Dequeue ();
}
}
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Next Activity B {0}", next_activity);
#endif
}
}
if (next_activity == null) {
if (waiting.Count > 0) {
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Waiting for {0} handles...", waiting.Count);
#endif
wi.WorkflowRuntime.OnWorkflowIdled (wi);
DelayActivity.WaitEvent.WaitOne ();
}
}
// Do we have delay activities no longer waiting?
foreach (DelayActivity delay in waiting) {
if (delay.Delayed == false) {
bool flag = false;
// Continue with the list of activities pending in the parent
next_activity = delay.Parent;
waiting.Remove (delay);
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Delayed Parent {0}", next_activity);
#endif
if (next_activity.ActivitiesToExecute.Count > 0) {
if (next_activity.ActivitiesToExecute.Count > 1)
flag = true;
if (next_activity != null) {
next_activity = next_activity.ActivitiesToExecute.Dequeue ();
if (flag == true) {
stack.Push (delay.Parent);
}
}
}
break;
}
}
#if DEBUG_EXECUTIONLOOP
Console.WriteLine ("Next activity to process {0}", next_activity);
#endif
activity = next_activity;
}
wi.WorkflowRuntime.OnWorkflowCompleted (wi);
}
private ActivityExecutionStatus CompensateTargetActivity(ActivityExecutionContext context)
{
Activity targetActivity = null;
Activity commonParentActivity = context.Activity;
do
{
commonParentActivity = commonParentActivity.Parent;
targetActivity = commonParentActivity.GetActivityByName(this.TargetActivityName, true);
} while (targetActivity == null);
if (targetActivity is ICompensatableActivity &&
targetActivity.ExecutionStatus == ActivityExecutionStatus.Closed &&
targetActivity.ExecutionResult == ActivityExecutionResult.Succeeded)
{
// same execution context
targetActivity.RegisterForStatusChange(Activity.ClosedEvent, this);
context.CompensateActivity(targetActivity);
return(context.Activity.ExecutionStatus);
}
else if (targetActivity.ExecutionStatus == ActivityExecutionStatus.Initialized)
{
// Template activity
// walk through active contexts
ActivityExecutionContextManager contextManager = context.ExecutionContextManager;
foreach (ActivityExecutionContext activeContext in contextManager.ExecutionContexts)
{
if (targetActivity.GetActivityByName(activeContext.Activity.QualifiedName, true) != null)
{
if (activeContext.Activity.ExecutionStatus == ActivityExecutionStatus.Compensating ||
activeContext.Activity.ExecutionStatus == ActivityExecutionStatus.Faulting ||
activeContext.Activity.ExecutionStatus == ActivityExecutionStatus.Canceling
)
{
return(context.Activity.ExecutionStatus);
}
}
}
// walk through all completed execution contexts
for (int index = contextManager.CompletedExecutionContexts.Count - 1; index >= 0; index--)
{
//only compensate direct child during explicit compensation
ActivityExecutionContextInfo completedActivityInfo = contextManager.CompletedExecutionContexts[index];
if (((completedActivityInfo.Flags & PersistFlags.NeedsCompensation) != 0))
{
ActivityExecutionContext revokedExecutionContext = contextManager.DiscardPersistedExecutionContext(completedActivityInfo);
if (revokedExecutionContext.Activity is ICompensatableActivity)
{
revokedExecutionContext.Activity.RegisterForStatusChange(Activity.ClosedEvent, this);
revokedExecutionContext.CompensateActivity(revokedExecutionContext.Activity);
}
return(context.Activity.ExecutionStatus);
}
}
}
else
{
// currently faulting, canceling, or compensating
if (CompensationUtils.TryCompensateLastCompletedChildActivity(context, targetActivity, this))
{
return(context.Activity.ExecutionStatus);
}
}
return(ActivityExecutionStatus.Closed);
}
