Code:
/ 4.0 / 4.0 / untmp / 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. 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