ActivityExecutionFilter.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 / Common / AuthoringOM / Filters / ActivityExecutionFilter.cs / 1305376 / ActivityExecutionFilter.cs
                        

                        
                            namespace System.Workflow.ComponentModel 
{
    using System;
    using System.Collections;
    using System.Collections.Generic; 
    using System.Diagnostics;
 
    internal abstract class ActivityExecutionFilter : ActivityExecutor, ISupportWorkflowChanges 
    {
        #region ISupportWorkflowChanges Members 

        public virtual void OnActivityAdded(ActivityExecutionContext executionContext, Activity addedActivity)
        {
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");
            if (addedActivity == null) 
                throw new ArgumentNullException("addedActivity"); 

            NextDynamicChangeExecutorInChain(executionContext.Activity).OnActivityAdded(executionContext, addedActivity); 
        }
        public virtual void OnActivityRemoved(ActivityExecutionContext executionContext, Activity removedActivity)
        {
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");
            if (removedActivity == null) 
                throw new ArgumentNullException("removedActivity"); 

            NextDynamicChangeExecutorInChain(executionContext.Activity).OnActivityRemoved(executionContext, removedActivity); 
        }
        public virtual void OnWorkflowChangesCompleted(ActivityExecutionContext executionContext)
        {
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");
 
            NextDynamicChangeExecutorInChain(executionContext.Activity).OnWorkflowChangesCompleted(executionContext); 
        }
        #endregion ISupportWorkflowChanges 

        #region Execute, Cancel, Compensate and HandleFault

        public override ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext) 
        {
            if (activity == null) 
                throw new ArgumentNullException("activity"); 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext"); 

            return NextActivityExecutorInChain(executionContext.Activity).Execute(activity, executionContext);
        }
 
        public override ActivityExecutionStatus Cancel(Activity activity, ActivityExecutionContext executionContext)
        { 
            if (activity == null) 
                throw new ArgumentNullException("activity");
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");

            // If primary activity is Closed, then return, these filters might have acquired locks
            // on to the primary activity, and in that case even if the activity has closed itself 
            // it might get Cancel signal. So we don't want activity to get Cancel signal, when it
            // already has declared itself Closed. 
            ActivityExecutor nextActivityExecutor = NextActivityExecutorInChain(executionContext.Activity); 
            if (!(nextActivityExecutor is ActivityExecutionFilter) && executionContext.Activity.HasPrimaryClosed)
 				return ActivityExecutionStatus.Closed; 

            return nextActivityExecutor.Cancel(activity, executionContext);
        }
        public override ActivityExecutionStatus HandleFault(Activity activity, ActivityExecutionContext executionContext, Exception exception) 
        {
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext"); 
            if (exception == null)
                throw new ArgumentNullException("exception"); 

            // If primary activity is Closed, then return, these filters might have acquired locks
            // on to the primary activity, and in that case even if the activity has closed itself
            // it might get HandleFault signal. So we don't want activity to get HandleFault signal, when it 
            // already has declared itself Closed.
            ActivityExecutor nextActivityExecutor = NextActivityExecutorInChain(executionContext.Activity); 
            if (!(nextActivityExecutor is ActivityExecutionFilter) && executionContext.Activity.HasPrimaryClosed) 
                return ActivityExecutionStatus.Closed;
 
            return nextActivityExecutor.HandleFault(activity, executionContext, exception);
        }
        public override ActivityExecutionStatus Compensate(Activity activity, ActivityExecutionContext executionContext)
        { 
            if (activity == null)
                throw new ArgumentNullException("activity"); 
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");
 
            return NextActivityExecutorInChain(executionContext.Activity).Compensate(activity, executionContext);
        }

        #endregion 

        #region Helper Methods 
 
        protected ActivityExecutor NextActivityExecutorInChain(Activity activity)
        { 
            if (activity == null)
                throw new ArgumentNullException("activity");

            ActivityExecutor nextActivityExecutor = null; 
            IList activityExecutors = ActivityExecutors.GetActivityExecutors(activity);
            int thisIndex = activityExecutors.IndexOf(this); 
            if (thisIndex < activityExecutors.Count - 1) 
                nextActivityExecutor = (ActivityExecutor)activityExecutors[thisIndex + 1];
            return nextActivityExecutor; 
        }
        protected ISupportWorkflowChanges NextDynamicChangeExecutorInChain(Activity activity)
        {
            return NextActivityExecutorInChain(activity) as ISupportWorkflowChanges; 
        }
        #endregion 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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