Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / Parallel.cs / 1305376 / Parallel.cs
namespace System.Workflow.Activities { #region Imports using System; using System.Text; using System.Reflection; using System.Collections; using System.CodeDom; using System.ComponentModel; using System.ComponentModel.Design; using System.Drawing.Design; using System.Drawing; using System.Workflow.ComponentModel; using System.Workflow.ComponentModel.Design; using System.Runtime.Serialization; using System.Collections.Generic; using System.Workflow.ComponentModel.Compiler; using System.Workflow.Runtime.DebugEngine; using System.Workflow.Activities.Common; #endregion [SRDescription(SR.ParallelActivityDescription)] [ToolboxItem(typeof(ParallelToolboxItem))] [ToolboxBitmap(typeof(ParallelActivity), "Resources.Parallel.png")] [Designer(typeof(ParallelDesigner), typeof(IDesigner))] [ActivityValidator(typeof(ParallelValidator))] [SRCategory(SR.Standard)] [WorkflowDebuggerSteppingAttribute(WorkflowDebuggerSteppingOption.Concurrent)] public sealed class ParallelActivity: CompositeActivity, IActivityEventListener{ #region Constructors public ParallelActivity() { } public ParallelActivity(string name) : base(name) { } #endregion #region Protected Methods protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); //Tomark that execute method is called for this activity. this.IsExecuting = true; for (int i = 0; i < this.EnabledActivities.Count; ++i) { Activity childActivity = this.EnabledActivities[i]; childActivity.RegisterForStatusChange(Activity.ClosedEvent, this); executionContext.ExecuteActivity(childActivity); } return (this.EnabledActivities.Count == 0) ? ActivityExecutionStatus.Closed : ActivityExecutionStatus.Executing; } protected override ActivityExecutionStatus Cancel(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); bool canCloseNow = true; for (int i = 0; i < this.EnabledActivities.Count; ++i) { Activity childActivity = this.EnabledActivities[i]; if (childActivity.ExecutionStatus == ActivityExecutionStatus.Executing) { executionContext.CancelActivity(childActivity); canCloseNow = false; } else if (childActivity.ExecutionStatus == ActivityExecutionStatus.Canceling || childActivity.ExecutionStatus == ActivityExecutionStatus.Faulting) { canCloseNow = false; } } return canCloseNow ? ActivityExecutionStatus.Closed : ActivityExecutionStatus.Canceling; } protected override void OnClosed(IServiceProvider provider) { base.RemoveProperty(ParallelActivity.IsExecutingProperty); } protected override void OnActivityChangeAdd(ActivityExecutionContext executionContext, Activity addedActivity) { if (executionContext == null) throw new ArgumentNullException("executionContext"); if (addedActivity == null) throw new ArgumentNullException("addedActivity"); ParallelActivity parallel = executionContext.Activity as ParallelActivity; if (parallel.ExecutionStatus == ActivityExecutionStatus.Executing && parallel.IsExecuting) { addedActivity.RegisterForStatusChange(Activity.ClosedEvent, this); executionContext.ExecuteActivity(addedActivity); } } protected override void OnActivityChangeRemove(ActivityExecutionContext rootExecutionContext, Activity removedActivity) { } protected override void OnWorkflowChangesCompleted(ActivityExecutionContext executionContext) { base.OnWorkflowChangesCompleted(executionContext); if (this.IsExecuting) { bool canCloseNow = true; for (int i = 0; i < this.EnabledActivities.Count; ++i) { Activity childActivity = this.EnabledActivities[i]; if (childActivity.ExecutionStatus != ActivityExecutionStatus.Closed) { canCloseNow = false; break; } } if (canCloseNow) executionContext.CloseActivity(); } } #endregion #region IActivityEventListener Members void IActivityEventListener .OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e) { if (sender == null) throw new ArgumentNullException("sender"); if (e == null) throw new ArgumentNullException("e"); ActivityExecutionContext context = sender as ActivityExecutionContext; if (context == null) throw new ArgumentException(SR.Error_SenderMustBeActivityExecutionContext, "sender"); ParallelActivity parallel = context.Activity as ParallelActivity; e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this); bool canCloseNow = true; for (int i = 0; i < parallel.EnabledActivities.Count; ++i) { Activity childActivity = parallel.EnabledActivities[i]; if (!(childActivity.ExecutionStatus == ActivityExecutionStatus.Initialized || childActivity.ExecutionStatus == ActivityExecutionStatus.Closed)) { canCloseNow = false; break; } } if (canCloseNow) context.CloseActivity(); } #endregion #region Runtime Specific Data //Runtime Properties static DependencyProperty IsExecutingProperty = DependencyProperty.Register("IsExecuting", typeof(bool), typeof(ParallelActivity), new PropertyMetadata(false)); private bool IsExecuting { get { return (bool)base.GetValue(IsExecutingProperty); } set { base.SetValue(IsExecutingProperty, value); } } #endregion } #region Validator internal sealed class ParallelValidator : CompositeActivityValidator { public override ValidationErrorCollection Validate(ValidationManager manager, object obj) { ValidationErrorCollection validationErrors = base.Validate(manager, obj); ParallelActivity parallel = obj as ParallelActivity; if (parallel == null) throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(ParallelActivity).FullName), "obj"); // Validate number of children if (parallel.EnabledActivities.Count < 2) validationErrors.Add(new ValidationError(SR.GetString(SR.Error_ParallelLessThanTwoChildren), ErrorNumbers.Error_ParallelLessThanTwoChildren)); bool notAllSequence = false; foreach(Activity activity in parallel.EnabledActivities) { if(activity.GetType() != typeof(SequenceActivity)) { notAllSequence = true; } } // Validate that all child activities are sequence activities. if (notAllSequence) validationErrors.Add(new ValidationError(SR.GetString(SR.Error_ParallelNotAllSequence), ErrorNumbers.Error_ParallelNotAllSequence)); return validationErrors; } } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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