/// <summary>
/// Start any child activities that need to be run
/// </summary>
/// <param name="cag"></param>
/// <param name="context"></param>
internal void TriggerChildren(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
Debug.Assert(cag != null);
Debug.Assert(context != null);
#if LOG
Log("TriggerChildren on " + cag.QualifiedName);
cag.CAGState.DumpState("Before TriggerChildren");
#endif
Dictionary <string, CAGChildStats> childrenStats = cag.CAGState.ChildrenStats;
// until condition is false, so let's look at all children
foreach (Activity act in cag.EnabledActivities)
{
// do we think this child needs to run?
if (childrenStats[act.QualifiedName].State != CAGChildState.Pending)
{
continue;
}
// find the run-time activity
Activity activity = GetRuntimeInitializedActivity(context, act);
if (activity.ExecutionStatus == ActivityExecutionStatus.Initialized)
{
ExecuteChild(cag, activity, context);
}
}
#if LOG
cag.CAGState.DumpState("After TriggerChildren");
#endif
}
protected override void OnActivityChangeRemove(ActivityExecutionContext executionContext, Activity removedActivity)
{
if (executionContext == null)
{
throw new ArgumentNullException("executionContext");
}
if (removedActivity == null)
{
throw new ArgumentNullException("removedActivity");
}
if (!removedActivity.Enabled)
{
return;
}
ConditionedActivityGroup cag = executionContext.Activity as ConditionedActivityGroup;
Debug.Assert(cag != null);
// find out the status of the cag
ConditionedActivityGroupStateInfo state = cag.CAGState;
if ((cag.ExecutionStatus == ActivityExecutionStatus.Executing) && (state != null))
{
state.ChildrenStats.Remove(removedActivity.QualifiedName);
}
}
protected override void OnWorkflowChangesCompleted(ActivityExecutionContext executionContext)
{
if (executionContext == null)
{
throw new ArgumentNullException("executionContext");
}
// find out the status of the cag
ConditionedActivityGroup currentActivity = executionContext.Activity as ConditionedActivityGroup;
// if CAG is executing... fire the conditions on the net result
if (currentActivity.ExecutionStatus == ActivityExecutionStatus.Executing)
{
// but hold on, a derived cag could be applying model changes before it
// "really" starts executing the activities. In that case it will evaluate
// the conditions later, at the appropriate time.
ConditionedActivityGroupStateInfo state = currentActivity.CAGState;
if ((state != null) && (!state.Testing))
{
// fire away... fire away... said the CAG
if (this.EvaluateConditions(currentActivity, executionContext))
{
// CAG until indicates we are done, so no children execute
this.Cleanup(currentActivity, executionContext);
}
else
{
// start any pending activity required
this.TriggerChildren(currentActivity, executionContext);
}
}
}
}
protected override void OnActivityChangeAdd(ActivityExecutionContext executionContext, Activity addedActivity)
{
if (executionContext == null)
{
throw new ArgumentNullException("executionContext");
}
if (addedActivity == null)
{
throw new ArgumentNullException("addedActivity");
}
if (!addedActivity.Enabled)
{
return;
}
ConditionedActivityGroup currentActivity = executionContext.Activity as ConditionedActivityGroup;
Debug.Assert(currentActivity != null);
ConditionedActivityGroupStateInfo state = currentActivity.CAGState;
if (currentActivity.ExecutionStatus == ActivityExecutionStatus.Executing && state != null)
{
Debug.Assert(currentActivity == addedActivity.Parent, "Attempting to add wrong activity to CAG");
state.ChildrenStats[addedActivity.QualifiedName] = new CAGChildStats();
}
}
internal bool Cleanup(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
// the completion condition has fired, or we are canceling
// either way, we want to cleanup
ConditionedActivityGroupStateInfo state = cag.CAGState;
state.Completed = true;
// cancel any children currently running
bool childrenActive = false;
Dictionary <string, CAGChildStats> childrenStats = state.ChildrenStats;
foreach (Activity act in cag.EnabledActivities)
{
// reset any Pending Execution for all child activity
if (childrenStats[act.QualifiedName].State == CAGChildState.Pending)
{
childrenStats[act.QualifiedName].State = CAGChildState.Idle;
}
// find the run-time activity
ActivityExecutionContext childContext = GetChildExecutionContext(context, act, false);
if (childContext != null)
{
// child must be running somewhere
Activity activity = GetRuntimeInitializedActivity(context, act);
switch (activity.ExecutionStatus)
{
case ActivityExecutionStatus.Executing:
// schedule cancellation on child
childContext.CancelActivity(activity);
childrenActive = true;
break;
case ActivityExecutionStatus.Canceling:
case ActivityExecutionStatus.Faulting:
childrenActive = true;
break;
case ActivityExecutionStatus.Closed:
CleanupChildAtClosure(context, activity);
break;
default:
// unhook our handler
// others will be removed when we get the complete/cancel notification
act.UnregisterForStatusChange(Activity.ClosedEvent, this);
break;
}
}
}
// if the CAG is quiet, we are all done
if (!childrenActive)
{
context.CloseActivity();
}
return(!childrenActive);
}
private void ExecuteChild(ConditionedActivityGroup cag, Activity childActivity, ActivityExecutionContext context)
{
ActivityExecutionContext context2 = GetChildExecutionContext(context, childActivity, true);
cag.CAGState.ChildrenStats[childActivity.QualifiedName].State = CAGChildState.Excuting;
context2.Activity.RegisterForStatusChange(Activity.ClosedEvent, this);
context2.ExecuteActivity(context2.Activity);
}
internal ConditionedActivityGroupStateInfo(ConditionedActivityGroup cag)
{
int len = cag.EnabledActivities.Count;
this.childActivityStats = new Dictionary <string, CAGChildStats>(len);
foreach (Activity act in cag.EnabledActivities)
{
this.childActivityStats[act.QualifiedName] = new CAGChildStats();
}
}
public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
{
ValidationErrorCollection validationErrors = base.Validate(manager, obj);
ConditionedActivityGroup conditionedActivityGroup = obj as ConditionedActivityGroup;
if (conditionedActivityGroup == null)
{
throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(ConditionedActivityGroup).FullName), "obj");
}
return(validationErrors);
}
internal bool Cleanup(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
ConditionedActivityGroupStateInfo cAGState = cag.CAGState;
cAGState.Completed = true;
bool flag = false;
Dictionary <string, CAGChildStats> childrenStats = cAGState.ChildrenStats;
foreach (Activity activity in cag.EnabledActivities)
{
if (childrenStats[activity.QualifiedName].State == CAGChildState.Pending)
{
childrenStats[activity.QualifiedName].State = CAGChildState.Idle;
}
ActivityExecutionContext context2 = GetChildExecutionContext(context, activity, false);
if (context2 != null)
{
Activity runtimeInitializedActivity = this.GetRuntimeInitializedActivity(context, activity);
switch (runtimeInitializedActivity.ExecutionStatus)
{
case ActivityExecutionStatus.Executing:
{
context2.CancelActivity(runtimeInitializedActivity);
flag = true;
continue;
}
case ActivityExecutionStatus.Canceling:
case ActivityExecutionStatus.Faulting:
{
flag = true;
continue;
}
case ActivityExecutionStatus.Closed:
{
this.CleanupChildAtClosure(context, runtimeInitializedActivity);
continue;
}
}
activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
}
}
if (!flag)
{
context.CloseActivity();
}
return(!flag);
}
private bool AllChildrenQuiet(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
foreach (ActivityExecutionContext context2 in context.ExecutionContextManager.ExecutionContexts)
{
if (cag.GetActivityByName(context2.Activity.QualifiedName, true) != null)
{
return(false);
}
}
return(true);
}
internal void TriggerChildren(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
Dictionary <string, CAGChildStats> childrenStats = cag.CAGState.ChildrenStats;
foreach (Activity activity in cag.EnabledActivities)
{
if (childrenStats[activity.QualifiedName].State == CAGChildState.Pending)
{
Activity runtimeInitializedActivity = this.GetRuntimeInitializedActivity(context, activity);
if (runtimeInitializedActivity.ExecutionStatus == ActivityExecutionStatus.Initialized)
{
this.ExecuteChild(cag, runtimeInitializedActivity, context);
}
}
}
}
private bool EvaluateChildConditions(ConditionedActivityGroup cag, Activity child, ActivityExecutionContext context)
{
bool flag;
ConditionedActivityGroupStateInfo cAGState = cag.CAGState;
try
{
cAGState.Testing = true;
ActivityCondition condition = (ActivityCondition)child.GetValue(WhenConditionProperty);
flag = (condition != null) ? condition.Evaluate(child, context) : (cAGState.ChildrenStats[child.QualifiedName].ExecutedCount == 0);
}
finally
{
cAGState.Testing = false;
}
return(flag);
}
private void ExecuteChild(ConditionedActivityGroup cag, Activity childActivity, ActivityExecutionContext context)
{
Debug.Assert(cag != null);
Debug.Assert(childActivity != null);
Debug.Assert(context != null);
Debug.Assert(childActivity.ExecutionStatus == ActivityExecutionStatus.Initialized);
#if LOG
Log("ExecuteChild " + childActivity.QualifiedName + " inside " + cag.QualifiedName);
#endif
ActivityExecutionContext childContext = GetChildExecutionContext(context, childActivity, true);
cag.CAGState.ChildrenStats[childActivity.QualifiedName].State = CAGChildState.Excuting;
// subscribe for child closure
childContext.Activity.RegisterForStatusChange(Activity.ClosedEvent, this);
// execute child in inner context
childContext.ExecuteActivity(childContext.Activity);
}
bool AllChildrenQuiet(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// if there are any execution contexts, 1 or more children still doing something
foreach (ActivityExecutionContext activeContext in context.ExecutionContextManager.ExecutionContexts)
{
if (cag.GetActivityByName(activeContext.Activity.QualifiedName, true) != null)
{
return(false);
}
}
// no children
return(true);
}
protected override void OnActivityChangeRemove(ActivityExecutionContext executionContext, Activity removedActivity)
{
if (executionContext == null)
{
throw new ArgumentNullException("executionContext");
}
if (removedActivity == null)
{
throw new ArgumentNullException("removedActivity");
}
if (removedActivity.Enabled)
{
ConditionedActivityGroup activity = executionContext.Activity as ConditionedActivityGroup;
ConditionedActivityGroupStateInfo cAGState = activity.CAGState;
if ((activity.ExecutionStatus == ActivityExecutionStatus.Executing) && (cAGState != null))
{
cAGState.ChildrenStats.Remove(removedActivity.QualifiedName);
}
}
}
/// <summary>
/// Evaluate the While condition for a particular child of the CAG
/// If no While condition, it becomes "execute once"
/// </summary>
/// <param name="cag"></param>
/// <param name="child"></param>
/// <param name="context"></param>
/// <returns></returns>
private bool EvaluateChildConditions(ConditionedActivityGroup cag, Activity child, ActivityExecutionContext context)
{
#if LOG
Log("EvaluateChildConditions on activity " + child.QualifiedName + " inside " + cag.QualifiedName);
#endif
// determine the result of the when condition (evaluate once if not specified)
ConditionedActivityGroupStateInfo state = cag.CAGState;
try
{
state.Testing = true;
ActivityCondition whenCondition = (ActivityCondition)child.GetValue(ConditionedActivityGroup.WhenConditionProperty);
return((whenCondition != null)
? whenCondition.Evaluate(child, context)
: (state.ChildrenStats[child.QualifiedName].ExecutedCount == 0));
}
finally
{
state.Testing = false;
}
}
internal bool EvaluateConditions(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
if (cag.CAGState.Completed)
{
return(false);
}
if ((cag.UntilCondition == null) || !cag.UntilCondition.Evaluate(cag, context))
{
int num = 0;
Dictionary <string, CAGChildStats> childrenStats = cag.CAGState.ChildrenStats;
foreach (Activity activity in cag.EnabledActivities)
{
if (childrenStats[activity.QualifiedName].State == CAGChildState.Excuting)
{
num++;
}
else
{
Activity runtimeInitializedActivity = this.GetRuntimeInitializedActivity(context, activity);
if (this.EvaluateChildConditions(cag, runtimeInitializedActivity, context))
{
num++;
childrenStats[activity.QualifiedName].State = CAGChildState.Pending;
}
}
}
if (num > 0)
{
return(false);
}
if (cag.UntilCondition != null)
{
throw new InvalidOperationException(SR.GetString("Error_CAGQuiet", new object[] { cag.QualifiedName }));
}
}
return(true);
}
protected override void OnWorkflowChangesCompleted(ActivityExecutionContext executionContext)
{
if (executionContext == null)
{
throw new ArgumentNullException("executionContext");
}
ConditionedActivityGroup activity = executionContext.Activity as ConditionedActivityGroup;
if (activity.ExecutionStatus == ActivityExecutionStatus.Executing)
{
ConditionedActivityGroupStateInfo cAGState = activity.CAGState;
if ((cAGState != null) && !cAGState.Testing)
{
if (this.EvaluateConditions(activity, executionContext))
{
this.Cleanup(activity, executionContext);
}
else
{
this.TriggerChildren(activity, executionContext);
}
}
}
}
internal void HandleEvent(ActivityExecutionContext context, SubscriptionEventArg e)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (e == null)
{
throw new ArgumentNullException("e");
}
ConditionedActivityGroup activity = context.Activity as ConditionedActivityGroup;
if (activity == null)
{
throw new ArgumentException(SR.GetString("Error_InvalidCAGActivityType"), "activity");
}
if (activity.ExecutionStatus != ActivityExecutionStatus.Closed)
{
EventType subscriptionType = e.SubscriptionType;
ActivityExecutionStatusChangedEventArgs args = (ActivityExecutionStatusChangedEventArgs)e.Args;
bool flag = false;
Dictionary <string, CAGChildStats> childrenStats = activity.CAGState.ChildrenStats;
if (childrenStats.ContainsKey(args.Activity.QualifiedName))
{
if (args.ExecutionStatus != ActivityExecutionStatus.Executing)
{
childrenStats[args.Activity.QualifiedName].State = CAGChildState.Idle;
}
if (args.ExecutionStatus == ActivityExecutionStatus.Closed)
{
CAGChildStats local1 = childrenStats[args.Activity.QualifiedName];
local1.ExecutedCount++;
}
try
{
if (activity.ExecutionStatus == ActivityExecutionStatus.Executing)
{
flag = this.EvaluateConditions(activity, context);
}
}
finally
{
this.CleanupChildAtClosure(context, args.Activity);
}
}
else if (activity.ExecutionStatus == ActivityExecutionStatus.Executing)
{
flag = this.EvaluateConditions(activity, context);
}
if (flag)
{
this.Cleanup(activity, context);
}
else if (activity.CAGState.Completed)
{
if (this.AllChildrenQuiet(activity, context))
{
context.CloseActivity();
}
}
else
{
this.TriggerChildren(activity, context);
}
}
}
/// <summary>
/// Evaluate the conditions on the CAG
/// </summary>
/// <param name="cag"></param>
/// <param name="context"></param>
/// <returns>True if CAG is complete (UNTIL == true, or no UNTIL and no children execute), false otherwise</returns>
internal bool EvaluateConditions(ConditionedActivityGroup cag, ActivityExecutionContext context)
{
Debug.Assert(cag != null);
Debug.Assert(context != null);
#if LOG
Log("EvaluateConditions on " + cag.QualifiedName);
cag.CAGState.DumpState("Before EvaluateConditions");
#endif
// if we've already decided to quit this CAG, don't do anything
if (cag.CAGState.Completed)
{
return(false);
}
// if the cag has an UNTIL condition, execute it
if ((cag.UntilCondition != null) && cag.UntilCondition.Evaluate(cag, context))
{
// UNTIL condition says we're done, no need to look at children
#if LOG
Log("Until condition is true");
#endif
return(true);
}
// until condition is false, so let's look at all children
int childExecuting = 0; // keep track of children executing
Dictionary <string, CAGChildStats> childrenStats = cag.CAGState.ChildrenStats;
foreach (Activity act in cag.EnabledActivities)
{
// if we think the child is executing, do nothing
if (childrenStats[act.QualifiedName].State == CAGChildState.Excuting)
{
++childExecuting;
continue;
}
// find the run-time activity
Activity activity = GetRuntimeInitializedActivity(context, act);
// should it execute?
if (EvaluateChildConditions(cag, activity, context))
{
++childExecuting;
childrenStats[act.QualifiedName].State = CAGChildState.Pending;
}
}
#if LOG
cag.CAGState.DumpState("After EvaluateConditions");
#endif
// if any work to do, CAG not yet done
if (childExecuting > 0)
{
return(false);
}
// CAG is quiet (nothing more to do)
// if specified an UNTIL condition but we have nothing to do
if (cag.UntilCondition != null)
{
#if LOG
Log("CAG quiet, but UNTIL condition is false, so error time");
#endif
throw new InvalidOperationException(SR.GetString(SR.Error_CAGQuiet, cag.QualifiedName));
}
#if LOG
Log("CAG quiet");
#endif
return(true);
}
internal void HandleEvent(ActivityExecutionContext context, SubscriptionEventArg e)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (e == null)
{
throw new ArgumentNullException("e");
}
ConditionedActivityGroup cag = context.Activity as ConditionedActivityGroup;
if (cag == null)
{
throw new ArgumentException(SR.GetString(SR.Error_InvalidCAGActivityType), "activity");
}
// Already done the cleanup from another child's signalling
if (cag.ExecutionStatus == ActivityExecutionStatus.Closed)
{
return;
}
if (e.SubscriptionType != EventType.StatusChange)
{
// split into seperate test to keep FxCop happy (only place SubscriptionType used)
Debug.Assert(false, "This CAG activity handler does not handle this event");
}
ActivityExecutionStatusChangedEventArgs args1 = (ActivityExecutionStatusChangedEventArgs)e.Args;
#if LOG
Log("HandleEvent for " + cag.QualifiedName);
Log("event = " + e.ToString());
Log("activity = " + args1.Activity.QualifiedName);
#endif
bool timeToQuit = false;
// is this event is for an immediate child?
Debug.Assert(cag == args1.Activity.Parent, "Received event for non-child of CAG");
Dictionary <string, CAGChildStats> childrenStats = cag.CAGState.ChildrenStats;
// it is possible that dynamic update has removed the child before we get the closed event
// if that is the case, we don't need to update it's stats since it's not there
if (childrenStats.ContainsKey(args1.Activity.QualifiedName))
{
// update our state about the child
if (args1.ExecutionStatus != ActivityExecutionStatus.Executing)
{
childrenStats[args1.Activity.QualifiedName].State = CAGChildState.Idle;
}
// @undone: this will break if scopes move to "Delayed" closing after Completed.
if (args1.ExecutionStatus == ActivityExecutionStatus.Closed)
{
childrenStats[args1.Activity.QualifiedName].ExecutedCount++;
}
try
{
// re-evaluate the conditions on any status change, as long as the CAG is still executing
if (cag.ExecutionStatus == ActivityExecutionStatus.Executing)
{
timeToQuit = EvaluateConditions(cag, context);
}
}
finally
{
// get rid of the child that just completed
// do this in the finally so that the child is cleaned up,
// even if EvaluateConditions throws beause the CAG is stalled
CleanupChildAtClosure(context, args1.Activity);
}
}
else
{
// child has been removed
// we still need to see if the CAG is done, provided we are still executing
if (cag.ExecutionStatus == ActivityExecutionStatus.Executing)
{
timeToQuit = EvaluateConditions(cag, context);
}
}
// is the CAG just completed?
if (timeToQuit)
{
Cleanup(cag, context);
}
else if (cag.CAGState.Completed)
{
// if the CAG is simply waiting for all children to complete, see if this is the last one
if (AllChildrenQuiet(cag, context))
{
// Mark the CAG as closed, if it hasn't already been marked so.
context.CloseActivity();
}
}
else
{
// CAG not done, so see if any children need to start
TriggerChildren(cag, context);
}
}
