Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / AsyncOperationContext.cs / 1305376 / AsyncOperationContext.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities { using System; using System.Activities.Runtime; using System.Runtime; using System.Activities.Hosting; class AsyncOperationContext { static AsyncCallback onResumeAsyncCodeActivityBookmark; ActivityExecutor executor; ActivityInstance owningActivityInstance; bool hasCanceled; bool hasCompleted; internal AsyncOperationContext(ActivityExecutor executor, ActivityInstance owningActivityInstance) { this.executor = executor; this.owningActivityInstance = owningActivityInstance; } internal bool IsStillActive { get { return !this.hasCanceled && !this.hasCompleted; } } public object UserState { get; set; } public bool HasCalledAsyncCodeActivityCancel { get; set; } public bool IsAborting { get; set; } bool ShouldCancel() { return this.IsStillActive; } bool ShouldComplete() { if (this.hasCanceled) { return false; } if (this.hasCompleted) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.OperationAlreadyCompleted)); } return true; } internal void CancelOperation() { if (ShouldCancel()) { this.executor.CompleteOperation(this.owningActivityInstance); } this.hasCanceled = true; } public void CompleteOperation() { if (ShouldComplete()) { this.executor.CompleteOperation(this.owningActivityInstance); this.hasCompleted = true; } } // used by AsyncCodeActivity to efficiently complete a "true" async operation internal void CompleteAsyncCodeActivity(CompleteData completeData) { Fx.Assert(completeData != null, "caller must validate this is not null"); if (!this.ShouldComplete()) { // nothing to do here return; } if (onResumeAsyncCodeActivityBookmark == null) { onResumeAsyncCodeActivityBookmark = Fx.ThunkCallback(new AsyncCallback(OnResumeAsyncCodeActivityBookmark)); } try { IAsyncResult result = this.executor.BeginResumeBookmark(Bookmark.AsyncOperationCompletionBookmark, completeData, TimeSpan.MaxValue, onResumeAsyncCodeActivityBookmark, this.executor); if (result.CompletedSynchronously) { this.executor.EndResumeBookmark(result); } } catch (Exception e) { if (Fx.IsFatal(e)) { throw; } this.executor.AbortWorkflowInstance(e); } } static void OnResumeAsyncCodeActivityBookmark(IAsyncResult result) { if (result.CompletedSynchronously) { return; } ActivityExecutor executor = (ActivityExecutor)result.AsyncState; try { executor.EndResumeBookmark(result); } catch (Exception e) { if (Fx.IsFatal(e)) { throw; } executor.AbortWorkflowInstance(e); } } internal abstract class CompleteData { AsyncOperationContext context; bool isCancel; protected CompleteData(AsyncOperationContext context, bool isCancel) { Fx.Assert(context != null, "Cannot have a null context."); this.context = context; this.isCancel = isCancel; } protected ActivityExecutor Executor { get { return this.context.executor; } } public ActivityInstance Instance { get { return this.context.owningActivityInstance; } } protected AsyncOperationContext AsyncContext { get { return this.context; } } // This method will throw if the complete/cancel is now invalid, it will return // true if the complete/cancel should proceed, and return false if the complete/cancel // should be ignored. bool ShouldCallExecutor() { if (this.isCancel) { return this.context.ShouldCancel(); } else { return this.context.ShouldComplete(); } } // This must be called from a workflow thread public void CompleteOperation() { if (ShouldCallExecutor()) { OnCallExecutor(); // We only update hasCompleted if we just did the completion work. // Calling Cancel followed by Complete does not mean you've completed. if (!this.isCancel) { this.context.hasCompleted = true; } } // We update hasCanceled even if we skipped the actual work. // Calling Complete followed by Cancel does imply that you have canceled. if (this.isCancel) { this.context.hasCanceled = true; } } protected abstract void OnCallExecutor(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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