Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Filters / TransactionFilter.cs / 1305376 / TransactionFilter.cs
// **************************************************************************** // Copyright (C) 2000-2001 Microsoft Corporation. All rights reserved. // // CONTENTS // Scope like TransactionModel Interceptor/Filter Executor // // DESCRIPTION // // *************************************************************************** namespace System.Workflow.ComponentModel { using System; using System.Collections; using System.Diagnostics; using System.ComponentModel; using System.Workflow.ComponentModel; using System.Workflow.ComponentModel.Design; using System.Workflow.Runtime; using System.Collections.Generic; using System.Runtime.Serialization; using System.Security.Permissions; using System.Reflection; // TransactedFilter // // This interceptor executor deals with the transaction aspects (as // defined by the current scope activity) of an activity. // // The activity must be attributed with SupportsTransactionAttribute. // The activity executor need not worry about any of the scope like // transaction behavior management. internal sealed class TransactedContextFilter : ActivityExecutionFilter, IActivityEventListener, IActivityEventListener { #region ActivityExecutor Members public override ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); if (activity == null) throw new ArgumentNullException("activity"); if (!activity.SupportsTransaction) throw new ArgumentException("activity"); // subscribe to the main activity activity.RegisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); activity.HoldLockOnStatusChange(this); return TransactedContextFilter.ExecuteActivity(activity, executionContext, false); } #endregion #region IActivityEventListener Members void IActivityEventListener .OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e) { ActivityExecutionContext context = sender as ActivityExecutionContext; if (context == null) throw new ArgumentException("sender"); if (context.Activity.HasPrimaryClosed && context.Activity.LockCountOnStatusChange == 1) { // get exception Exception exception = (Exception)context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty); if (exception != null) { WorkflowTransactionOptions transactionOptions = TransactedContextFilter.GetTransactionOptions(context.Activity); if (transactionOptions != null) { // request revert to checkpoint state context.RequestRevertToCheckpointState(this.OnRevertInstanceState, new StateRevertedEventArgs(exception), false, null); } else { // release locks context.ReleaseLocks(false); context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); context.Activity.ReleaseLockOnStatusChange(this); } } else { try { // 1st param is for transactional, means if the release lock on status change will try to persist the workflow instace // if that fails, then locks will be reacquired, otherwise they will be released. context.ReleaseLocks(true); context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); context.Activity.ReleaseLockOnStatusChange(this); context.DisposeCheckpointState(); } catch { // re-subscribe context.Activity.RegisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); throw; } } } } #endregion #region OnRevertInstanceData Member private void OnRevertInstanceState(object sender, EventArgs e) { if (sender == null) throw new ArgumentNullException("sender"); if (e == null) throw new ArgumentNullException("e"); ActivityExecutionContext context = sender as ActivityExecutionContext; StateRevertedEventArgs args = e as StateRevertedEventArgs; // stash exception context.Activity.SetValueCommon(ActivityExecutionContext.CurrentExceptionProperty, args.Exception, ActivityExecutionContext.CurrentExceptionProperty.DefaultMetadata, false); // cancel the activity context.ReleaseLocks(false); context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); context.Activity.ReleaseLockOnStatusChange(this); } #endregion #region IActivityEventListener Members void IActivityEventListener .OnEvent(object sender, EventArgs e) { ActivityExecutionContext context = (ActivityExecutionContext)sender; // only if activity is still executing, then run it if (context.Activity.ExecutionStatus == ActivityExecutionStatus.Executing) { ActivityExecutionStatus newStatus = TransactedContextFilter.ExecuteActivity(context.Activity, context, true); if (newStatus == ActivityExecutionStatus.Closed) context.CloseActivity(); } } #endregion #region Helper Methods private static ActivityExecutionStatus ExecuteActivity(Activity activity, ActivityExecutionContext context, bool locksAcquired) { // acquire needed synchronization TransactedContextFilter executor = (TransactedContextFilter)ActivityExecutors.GetActivityExecutorFromType(typeof(TransactedContextFilter)); if (!locksAcquired && !context.AcquireLocks(executor)) return activity.ExecutionStatus; // checkpoint for instance state // WorkflowTransactionOptions transaction = TransactedContextFilter.GetTransactionOptions(activity); if (transaction != null) context.CheckpointInstanceState(); // delegate to the next executor for the activity return executor.NextActivityExecutorInChain(activity).Execute(activity, context); } internal static WorkflowTransactionOptions GetTransactionOptions(Activity activity) { return activity.GetValue(activity is TransactionScopeActivity ? TransactionScopeActivity.TransactionOptionsProperty : CompensatableTransactionScopeActivity.TransactionOptionsProperty) as WorkflowTransactionOptions; } #endregion } #region StateRevertedEventArgs Class [Serializable] internal class StateRevertedEventArgs : EventArgs { public Exception Exception; public StateRevertedEventArgs(Exception exception) { this.Exception = exception; } } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. // **************************************************************************** // Copyright (C) 2000-2001 Microsoft Corporation. All rights reserved. // // CONTENTS // Scope like TransactionModel Interceptor/Filter Executor // // DESCRIPTION // // *************************************************************************** namespace System.Workflow.ComponentModel { using System; using System.Collections; using System.Diagnostics; using System.ComponentModel; using System.Workflow.ComponentModel; using System.Workflow.ComponentModel.Design; using System.Workflow.Runtime; using System.Collections.Generic; using System.Runtime.Serialization; using System.Security.Permissions; using System.Reflection; // TransactedFilter // // This interceptor executor deals with the transaction aspects (as // defined by the current scope activity) of an activity. // // The activity must be attributed with SupportsTransactionAttribute. // The activity executor need not worry about any of the scope like // transaction behavior management. internal sealed class TransactedContextFilter : ActivityExecutionFilter, IActivityEventListener , IActivityEventListener { #region ActivityExecutor Members public override ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); if (activity == null) throw new ArgumentNullException("activity"); if (!activity.SupportsTransaction) throw new ArgumentException("activity"); // subscribe to the main activity activity.RegisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); activity.HoldLockOnStatusChange(this); return TransactedContextFilter.ExecuteActivity(activity, executionContext, false); } #endregion #region IActivityEventListener Members void IActivityEventListener .OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e) { ActivityExecutionContext context = sender as ActivityExecutionContext; if (context == null) throw new ArgumentException("sender"); if (context.Activity.HasPrimaryClosed && context.Activity.LockCountOnStatusChange == 1) { // get exception Exception exception = (Exception)context.Activity.GetValue(ActivityExecutionContext.CurrentExceptionProperty); if (exception != null) { WorkflowTransactionOptions transactionOptions = TransactedContextFilter.GetTransactionOptions(context.Activity); if (transactionOptions != null) { // request revert to checkpoint state context.RequestRevertToCheckpointState(this.OnRevertInstanceState, new StateRevertedEventArgs(exception), false, null); } else { // release locks context.ReleaseLocks(false); context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); context.Activity.ReleaseLockOnStatusChange(this); } } else { try { // 1st param is for transactional, means if the release lock on status change will try to persist the workflow instace // if that fails, then locks will be reacquired, otherwise they will be released. context.ReleaseLocks(true); context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); context.Activity.ReleaseLockOnStatusChange(this); context.DisposeCheckpointState(); } catch { // re-subscribe context.Activity.RegisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); throw; } } } } #endregion #region OnRevertInstanceData Member private void OnRevertInstanceState(object sender, EventArgs e) { if (sender == null) throw new ArgumentNullException("sender"); if (e == null) throw new ArgumentNullException("e"); ActivityExecutionContext context = sender as ActivityExecutionContext; StateRevertedEventArgs args = e as StateRevertedEventArgs; // stash exception context.Activity.SetValueCommon(ActivityExecutionContext.CurrentExceptionProperty, args.Exception, ActivityExecutionContext.CurrentExceptionProperty.DefaultMetadata, false); // cancel the activity context.ReleaseLocks(false); context.Activity.UnregisterForStatusChange(Activity.LockCountOnStatusChangeChangedEvent, this); context.Activity.ReleaseLockOnStatusChange(this); } #endregion #region IActivityEventListener Members void IActivityEventListener .OnEvent(object sender, EventArgs e) { ActivityExecutionContext context = (ActivityExecutionContext)sender; // only if activity is still executing, then run it if (context.Activity.ExecutionStatus == ActivityExecutionStatus.Executing) { ActivityExecutionStatus newStatus = TransactedContextFilter.ExecuteActivity(context.Activity, context, true); if (newStatus == ActivityExecutionStatus.Closed) context.CloseActivity(); } } #endregion #region Helper Methods private static ActivityExecutionStatus ExecuteActivity(Activity activity, ActivityExecutionContext context, bool locksAcquired) { // acquire needed synchronization TransactedContextFilter executor = (TransactedContextFilter)ActivityExecutors.GetActivityExecutorFromType(typeof(TransactedContextFilter)); if (!locksAcquired && !context.AcquireLocks(executor)) return activity.ExecutionStatus; // checkpoint for instance state // WorkflowTransactionOptions transaction = TransactedContextFilter.GetTransactionOptions(activity); if (transaction != null) context.CheckpointInstanceState(); // delegate to the next executor for the activity return executor.NextActivityExecutorInChain(activity).Execute(activity, context); } internal static WorkflowTransactionOptions GetTransactionOptions(Activity activity) { return activity.GetValue(activity is TransactionScopeActivity ? TransactionScopeActivity.TransactionOptionsProperty : CompensatableTransactionScopeActivity.TransactionOptionsProperty) as WorkflowTransactionOptions; } #endregion } #region StateRevertedEventArgs Class [Serializable] internal class StateRevertedEventArgs : EventArgs { public Exception Exception; public StateRevertedEventArgs(Exception exception) { this.Exception = exception; } } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DeviceContext2.cs
- InstanceDataCollectionCollection.cs
- XmlSchemaProviderAttribute.cs
- FilteredXmlReader.cs
- DbInsertCommandTree.cs
- DynamicScriptObject.cs
- TextContainerChangeEventArgs.cs
- Pkcs9Attribute.cs
- TypeElement.cs
- OLEDB_Enum.cs
- CellTreeSimplifier.cs
- BamlBinaryReader.cs
- MetadataItemEmitter.cs
- LocatorPart.cs
- SafeUserTokenHandle.cs
- ReadOnlyDictionary.cs
- FontFamilyValueSerializer.cs
- ClientSponsor.cs
- XmlSortKeyAccumulator.cs
- xml.cs
- OpenFileDialog.cs
- IndexerNameAttribute.cs
- QilName.cs
- dsa.cs
- Rect3DValueSerializer.cs
- JsonReaderWriterFactory.cs
- Image.cs
- CompilerScopeManager.cs
- DrawingGroup.cs
- FrameAutomationPeer.cs
- QilGenerator.cs
- SchemaTypeEmitter.cs
- HtmlFormWrapper.cs
- WindowsProgressbar.cs
- KeyValueSerializer.cs
- SchemaMapping.cs
- XmlParserContext.cs
- PageOrientation.cs
- SiteMapNodeCollection.cs
- TraceHandler.cs
- KeyGestureValueSerializer.cs
- PhysicalOps.cs
- _NegoState.cs
- BamlLocalizer.cs
- MetaModel.cs
- CodeTypeReferenceSerializer.cs
- PageThemeBuildProvider.cs
- MembershipSection.cs
- XmlConverter.cs
- DispatcherHooks.cs
- LookupBindingPropertiesAttribute.cs
- SqlCommandSet.cs
- NullableConverter.cs
- ReadOnlyKeyedCollection.cs
- SR.cs
- AppDomainProtocolHandler.cs
- TemplateContainer.cs
- DefaultValueAttribute.cs
- WebBaseEventKeyComparer.cs
- SpeechSynthesizer.cs
- RelationalExpressions.cs
- KeySplineConverter.cs
- RequestCacheValidator.cs
- ToolStripKeyboardHandlingService.cs
- ClientApiGenerator.cs
- CatalogPart.cs
- ProxyWebPartConnectionCollection.cs
- ClassHandlersStore.cs
- PointAnimationClockResource.cs
- EventBuilder.cs
- HttpPostedFile.cs
- TypePresenter.xaml.cs
- WebAdminConfigurationHelper.cs
- dbdatarecord.cs
- RefExpr.cs
- MenuItem.cs
- IEnumerable.cs
- RSACryptoServiceProvider.cs
- DBBindings.cs
- OutputCacheProfileCollection.cs
- GridPattern.cs
- EntityDataSourceColumn.cs
- MemberProjectionIndex.cs
- XsltSettings.cs
- EventsTab.cs
- RectangleGeometry.cs
- ObjectHandle.cs
- JsonSerializer.cs
- WinFormsSecurity.cs
- DetailsViewPageEventArgs.cs
- ToolStripProgressBar.cs
- ByteAnimation.cs
- CompositeCollectionView.cs
- VectorValueSerializer.cs
- CodeTryCatchFinallyStatement.cs
- BitmapEffectInput.cs
- TypeElement.cs
- SelectedCellsChangedEventArgs.cs
- DeploymentSection.cs
- IPipelineRuntime.cs