Parallel.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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. All rights reserved.

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