Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Filters / FaultHandlingFilter.cs / 1305376 / FaultHandlingFilter.cs
namespace System.Workflow.ComponentModel
{
using System;
using System.Collections;
using System.Diagnostics;
using System.ComponentModel;
using System.Collections.Generic;
using System.Workflow.ComponentModel.Design;
internal sealed class FaultAndCancellationHandlingFilter : ActivityExecutionFilter, IActivityEventListener
{
public static DependencyProperty FaultProcessedProperty = DependencyProperty.RegisterAttached("FaultProcessed", typeof(bool), typeof(FaultAndCancellationHandlingFilter), new PropertyMetadata(false));
#region Execute Signal
public override ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext)
{
if (activity == null)
throw new ArgumentNullException("activity");
if (executionContext == null)
throw new ArgumentNullException("executionContext");
if (! (activity is CompositeActivity))
throw new InvalidOperationException("activity");
executionContext.Activity.HoldLockOnStatusChange(this);
return base.Execute(activity, executionContext);
}
public override ActivityExecutionStatus HandleFault(Activity activity, ActivityExecutionContext executionContext, Exception exception)
{
if (activity.HasPrimaryClosed != true)
return base.HandleFault(activity, executionContext, exception);
//We are handed fault again. Quiten Fault & Cancellation Handlers if any running.
Activity handlersActivity = FaultAndCancellationHandlingFilter.GetFaultHandlers(executionContext.Activity);
if (handlersActivity != null && (handlersActivity.ExecutionStatus != ActivityExecutionStatus.Closed && handlersActivity.ExecutionStatus != ActivityExecutionStatus.Initialized))
{
if(handlersActivity.ExecutionStatus == ActivityExecutionStatus.Executing)
executionContext.CancelActivity(handlersActivity);
return ActivityExecutionStatus.Faulting;
}
else
{
handlersActivity = FaultAndCancellationHandlingFilter.GetCancellationHandler(executionContext.Activity);
if (handlersActivity != null && (handlersActivity.ExecutionStatus != ActivityExecutionStatus.Closed && handlersActivity.ExecutionStatus != ActivityExecutionStatus.Initialized))
{
if(handlersActivity.ExecutionStatus == ActivityExecutionStatus.Executing)
executionContext.CancelActivity(handlersActivity);
return ActivityExecutionStatus.Faulting;
}
}
if ((bool)activity.GetValue(FaultAndCancellationHandlingFilter.FaultProcessedProperty))
SafeReleaseLockOnStatusChange(executionContext);
return base.HandleFault(activity, executionContext, exception);
}
#endregion
#region IActivityEventListener Members
public void OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e)
{
ActivityExecutionContext context = sender as ActivityExecutionContext;
if (context == null)
throw new ArgumentException("sender");
// waiting for primary activity to close
if (e.Activity == context.Activity)
{
if (context.Activity.HasPrimaryClosed &&
!(bool)context.Activity.GetValue(FaultAndCancellationHandlingFilter.FaultProcessedProperty))
{
context.Activity.SetValue(FaultAndCancellationHandlingFilter.FaultProcessedProperty, true);
if (context.Activity.WasExecuting &&
context.Activity.ExecutionResult == ActivityExecutionResult.Faulted &&
context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty) != null)
{
// execute exceptionHandlers, iff activity has transitioned from Executing to Faulting.
CompositeActivity exceptionHandlersActivity = FaultAndCancellationHandlingFilter.GetFaultHandlers(context.Activity);
if (exceptionHandlersActivity != null)
{
// listen for FaultHandler status change events
exceptionHandlersActivity.RegisterForStatusChange(Activity.ClosedEvent, this);
// execute exception handlers
context.ExecuteActivity(exceptionHandlersActivity);
}
else
{
// compensate completed children
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// no children to compensate...release lock on to the close status of the activity
}
}
else if (context.Activity.ExecutionResult == ActivityExecutionResult.Canceled)
{
// if primary activity is closed and outcome is canceled, then run the cancel handler
Activity cancelHandler = FaultAndCancellationHandlingFilter.GetCancellationHandler(context.Activity);
if (cancelHandler != null)
{
// execute the cancel handler
cancelHandler.RegisterForStatusChange(Activity.ClosedEvent, this);
context.ExecuteActivity(cancelHandler);
}
else
{
// run default compensation
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// release lock on to the close status of the activity
}
}
else // release lock on to the close status of the activity
SafeReleaseLockOnStatusChange(context);
}
}
else if ( (e.Activity is FaultHandlersActivity || e.Activity is CancellationHandlerActivity)
&&
(e.ExecutionStatus == ActivityExecutionStatus.Closed)
)
{
// remove subscriber
e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
// fetch the exception , it would be null if it was handled
if (context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty) != null)
{
// the exception was not handled by exceptionHandlers.... do default exceptionHandling
// compesate completed children
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// no children to compensate.Release lock on to the close status of the activity
}
else// the exception was handled by the exceptionHandlers. Release lock on to the close status of the parent activity
SafeReleaseLockOnStatusChange(context);
}
else if (e.ExecutionStatus == ActivityExecutionStatus.Closed)
{
// compensation of a child was in progress. // remove subscriber for this
e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
// see if there are other children to be compensated
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// release lock on to the close status of the parent activity
}
}
void SafeReleaseLockOnStatusChange(ActivityExecutionContext context)
{
try
{
context.Activity.ReleaseLockOnStatusChange(this);
}
catch(Exception)
{
context.Activity.RemoveProperty(FaultAndCancellationHandlingFilter.FaultProcessedProperty);
throw;
}
}
#endregion
#region Helper Methods
internal static CompositeActivity GetFaultHandlers(Activity activityWithExceptionHandlers)
{
CompositeActivity exceptionHandlers = null;
CompositeActivity compositeActivity = activityWithExceptionHandlers as CompositeActivity;
if (compositeActivity != null)
{
foreach (Activity activity in ((ISupportAlternateFlow)compositeActivity).AlternateFlowActivities)
{
if (activity is FaultHandlersActivity)
{
exceptionHandlers = activity as CompositeActivity;
break;
}
}
}
return exceptionHandlers;
}
internal static Activity GetCancellationHandler(Activity activityWithCancelHandler)
{
Activity cancelHandler = null;
CompositeActivity compositeActivity = activityWithCancelHandler as CompositeActivity;
if (compositeActivity != null)
{
foreach (Activity activity in ((ISupportAlternateFlow)compositeActivity).AlternateFlowActivities)
{
if (activity is CancellationHandlerActivity)
{
cancelHandler = activity;
break;
}
}
}
return cancelHandler;
}
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
namespace System.Workflow.ComponentModel
{
using System;
using System.Collections;
using System.Diagnostics;
using System.ComponentModel;
using System.Collections.Generic;
using System.Workflow.ComponentModel.Design;
internal sealed class FaultAndCancellationHandlingFilter : ActivityExecutionFilter, IActivityEventListener
{
public static DependencyProperty FaultProcessedProperty = DependencyProperty.RegisterAttached("FaultProcessed", typeof(bool), typeof(FaultAndCancellationHandlingFilter), new PropertyMetadata(false));
#region Execute Signal
public override ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext)
{
if (activity == null)
throw new ArgumentNullException("activity");
if (executionContext == null)
throw new ArgumentNullException("executionContext");
if (! (activity is CompositeActivity))
throw new InvalidOperationException("activity");
executionContext.Activity.HoldLockOnStatusChange(this);
return base.Execute(activity, executionContext);
}
public override ActivityExecutionStatus HandleFault(Activity activity, ActivityExecutionContext executionContext, Exception exception)
{
if (activity.HasPrimaryClosed != true)
return base.HandleFault(activity, executionContext, exception);
//We are handed fault again. Quiten Fault & Cancellation Handlers if any running.
Activity handlersActivity = FaultAndCancellationHandlingFilter.GetFaultHandlers(executionContext.Activity);
if (handlersActivity != null && (handlersActivity.ExecutionStatus != ActivityExecutionStatus.Closed && handlersActivity.ExecutionStatus != ActivityExecutionStatus.Initialized))
{
if(handlersActivity.ExecutionStatus == ActivityExecutionStatus.Executing)
executionContext.CancelActivity(handlersActivity);
return ActivityExecutionStatus.Faulting;
}
else
{
handlersActivity = FaultAndCancellationHandlingFilter.GetCancellationHandler(executionContext.Activity);
if (handlersActivity != null && (handlersActivity.ExecutionStatus != ActivityExecutionStatus.Closed && handlersActivity.ExecutionStatus != ActivityExecutionStatus.Initialized))
{
if(handlersActivity.ExecutionStatus == ActivityExecutionStatus.Executing)
executionContext.CancelActivity(handlersActivity);
return ActivityExecutionStatus.Faulting;
}
}
if ((bool)activity.GetValue(FaultAndCancellationHandlingFilter.FaultProcessedProperty))
SafeReleaseLockOnStatusChange(executionContext);
return base.HandleFault(activity, executionContext, exception);
}
#endregion
#region IActivityEventListener Members
public void OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e)
{
ActivityExecutionContext context = sender as ActivityExecutionContext;
if (context == null)
throw new ArgumentException("sender");
// waiting for primary activity to close
if (e.Activity == context.Activity)
{
if (context.Activity.HasPrimaryClosed &&
!(bool)context.Activity.GetValue(FaultAndCancellationHandlingFilter.FaultProcessedProperty))
{
context.Activity.SetValue(FaultAndCancellationHandlingFilter.FaultProcessedProperty, true);
if (context.Activity.WasExecuting &&
context.Activity.ExecutionResult == ActivityExecutionResult.Faulted &&
context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty) != null)
{
// execute exceptionHandlers, iff activity has transitioned from Executing to Faulting.
CompositeActivity exceptionHandlersActivity = FaultAndCancellationHandlingFilter.GetFaultHandlers(context.Activity);
if (exceptionHandlersActivity != null)
{
// listen for FaultHandler status change events
exceptionHandlersActivity.RegisterForStatusChange(Activity.ClosedEvent, this);
// execute exception handlers
context.ExecuteActivity(exceptionHandlersActivity);
}
else
{
// compensate completed children
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// no children to compensate...release lock on to the close status of the activity
}
}
else if (context.Activity.ExecutionResult == ActivityExecutionResult.Canceled)
{
// if primary activity is closed and outcome is canceled, then run the cancel handler
Activity cancelHandler = FaultAndCancellationHandlingFilter.GetCancellationHandler(context.Activity);
if (cancelHandler != null)
{
// execute the cancel handler
cancelHandler.RegisterForStatusChange(Activity.ClosedEvent, this);
context.ExecuteActivity(cancelHandler);
}
else
{
// run default compensation
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// release lock on to the close status of the activity
}
}
else // release lock on to the close status of the activity
SafeReleaseLockOnStatusChange(context);
}
}
else if ( (e.Activity is FaultHandlersActivity || e.Activity is CancellationHandlerActivity)
&&
(e.ExecutionStatus == ActivityExecutionStatus.Closed)
)
{
// remove subscriber
e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
// fetch the exception , it would be null if it was handled
if (context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty) != null)
{
// the exception was not handled by exceptionHandlers.... do default exceptionHandling
// compesate completed children
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// no children to compensate.Release lock on to the close status of the activity
}
else// the exception was handled by the exceptionHandlers. Release lock on to the close status of the parent activity
SafeReleaseLockOnStatusChange(context);
}
else if (e.ExecutionStatus == ActivityExecutionStatus.Closed)
{
// compensation of a child was in progress. // remove subscriber for this
e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
// see if there are other children to be compensated
if (!CompensationUtils.TryCompensateLastCompletedChildActivity(context, context.Activity, this))
SafeReleaseLockOnStatusChange(context);// release lock on to the close status of the parent activity
}
}
void SafeReleaseLockOnStatusChange(ActivityExecutionContext context)
{
try
{
context.Activity.ReleaseLockOnStatusChange(this);
}
catch(Exception)
{
context.Activity.RemoveProperty(FaultAndCancellationHandlingFilter.FaultProcessedProperty);
throw;
}
}
#endregion
#region Helper Methods
internal static CompositeActivity GetFaultHandlers(Activity activityWithExceptionHandlers)
{
CompositeActivity exceptionHandlers = null;
CompositeActivity compositeActivity = activityWithExceptionHandlers as CompositeActivity;
if (compositeActivity != null)
{
foreach (Activity activity in ((ISupportAlternateFlow)compositeActivity).AlternateFlowActivities)
{
if (activity is FaultHandlersActivity)
{
exceptionHandlers = activity as CompositeActivity;
break;
}
}
}
return exceptionHandlers;
}
internal static Activity GetCancellationHandler(Activity activityWithCancelHandler)
{
Activity cancelHandler = null;
CompositeActivity compositeActivity = activityWithCancelHandler as CompositeActivity;
if (compositeActivity != null)
{
foreach (Activity activity in ((ISupportAlternateFlow)compositeActivity).AlternateFlowActivities)
{
if (activity is CancellationHandlerActivity)
{
cancelHandler = activity;
break;
}
}
}
return cancelHandler;
}
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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