Code:
/ 4.0 / 4.0 / untmp / 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.
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