ActivityExecutor.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / ActivityExecutor.cs / 1305376 / ActivityExecutor.cs
                        
                        
                            using System; 
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Runtime.Serialization; 
using System.Security.Permissions;
 
namespace System.Workflow.ComponentModel 
{
    #region ActivityExecutor 

    internal abstract class ActivityExecutor
    {
        public abstract ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext); 
        public abstract ActivityExecutionStatus Cancel(Activity activity, ActivityExecutionContext executionContext);
        public abstract ActivityExecutionStatus HandleFault(Activity activity, ActivityExecutionContext executionContext, Exception exception); 
        public abstract ActivityExecutionStatus Compensate(Activity activity, ActivityExecutionContext executionContext); 
    }
 
    internal class ActivityExecutor : ActivityExecutor where T : Activity
    {
        #region System.Workflow.ComponentModel.ActivityExecutor Methods
 
        public sealed override ActivityExecutionStatus Execute(Activity activity, ActivityExecutionContext executionContext)
        { 
            return this.Execute((T)activity, executionContext); 
        }
        public sealed override ActivityExecutionStatus Cancel(Activity activity, ActivityExecutionContext executionContext) 
        {
            return this.Cancel((T)activity, executionContext);
        }
        public sealed override ActivityExecutionStatus HandleFault(Activity activity, ActivityExecutionContext executionContext, Exception exception) 
        {
            return this.HandleFault((T)activity, executionContext, exception); 
        } 
        public sealed override ActivityExecutionStatus Compensate(Activity activity, ActivityExecutionContext executionContext)
        { 
            return this.Compensate((T)activity, executionContext);
        }
        #endregion
 
        #region ActivityExecutor Members
        protected virtual ActivityExecutionStatus Execute(T activity, ActivityExecutionContext executionContext) 
        { 
            if (activity == null)
                throw new ArgumentNullException("activity"); 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");

            return activity.Execute(executionContext); 
        }
        protected virtual ActivityExecutionStatus Cancel(T activity, ActivityExecutionContext executionContext) 
        { 
            if (activity == null)
                throw new ArgumentNullException("activity"); 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");

            return activity.Cancel(executionContext); 
        }
        protected virtual ActivityExecutionStatus HandleFault(T activity, ActivityExecutionContext executionContext, Exception exception) 
        { 
            if (activity == null)
                throw new ArgumentNullException("activity"); 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");

            return activity.HandleFault(executionContext, exception); 
        }
        protected virtual ActivityExecutionStatus Compensate(T activity, ActivityExecutionContext executionContext) 
        { 
            if (activity == null)
                throw new ArgumentNullException("activity"); 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");

            System.Diagnostics.Debug.Assert(activity is ICompensatableActivity, "should not get Compensate, if activity is not compensatable"); 
            return ((ICompensatableActivity)activity).Compensate(executionContext);
        } 
 
        #endregion ActivityExecutor
    } 
    #endregion

    #region CompositeActivityExecutor
    internal class CompositeActivityExecutor : ActivityExecutor, ISupportWorkflowChanges where T : CompositeActivity 
    {
        //@@undone:mayankm Once all ActivityExecutor is removed this method should not be virtual. 
        void ISupportWorkflowChanges.OnActivityAdded(ActivityExecutionContext executionContext, Activity addedActivity) 
        {
            if (executionContext == null) 
                throw new ArgumentNullException("executionContext");
            if (addedActivity == null)
                throw new ArgumentNullException("addedActivity");
 
            CompositeActivity compositeActivity = executionContext.Activity as CompositeActivity;
            if (compositeActivity == null) 
                throw new ArgumentException(SR.Error_InvalidActivityExecutionContext, "executionContext"); 

            compositeActivity.OnActivityChangeAdd(executionContext, addedActivity); 
        }

        void ISupportWorkflowChanges.OnActivityRemoved(ActivityExecutionContext executionContext, Activity removedActivity)
        { 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext"); 
            if (removedActivity == null) 
                throw new ArgumentNullException("removedActivity");
 
            CompositeActivity compositeActivity = executionContext.Activity as CompositeActivity;
            if (compositeActivity == null)
                throw new ArgumentException(SR.Error_InvalidActivityExecutionContext, "executionContext");
 
            compositeActivity.OnActivityChangeRemove(executionContext, removedActivity);
        } 
 
        void ISupportWorkflowChanges.OnWorkflowChangesCompleted(ActivityExecutionContext executionContext)
        { 
            if (executionContext == null)
                throw new ArgumentNullException("executionContext");

            CompositeActivity compositeActivity = executionContext.Activity as CompositeActivity; 

            if (compositeActivity == null) 
                throw new ArgumentException(SR.Error_InvalidActivityExecutionContext, "executionContext"); 

            compositeActivity.OnWorkflowChangesCompleted(executionContext); 
        }

        // Refer Bug 9339 (VB Compilation Failure - Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.)
        //An unhandled exception of type 'System.TypeLoadException' occurred 
        // "Signature of the body and declaration in a method implementation do not match"
        protected override ActivityExecutionStatus Execute(T activity, ActivityExecutionContext executionContext) 
        { 
            return base.Execute(activity, executionContext);
        } 

        protected override ActivityExecutionStatus Cancel(T activity, ActivityExecutionContext executionContext)
        {
            return base.Cancel(activity, executionContext); 
        }
    } 
    #endregion 

    #region ActivityExecutors Class 

    internal static class ActivityExecutors
    {
        private static Hashtable typeToExecutorMapping = new Hashtable(); 
        private static Hashtable executors = new Hashtable();
 
        internal static ActivityExecutor[] GetActivityExecutors(Activity activity) 
        {
            if (activity == null) 
                throw new ArgumentNullException("activity");

            Type activityType = activity.GetType();
            ActivityExecutor[] activityExecutors = executors[activityType] as ActivityExecutor[]; 
            if (activityExecutors != null)
                return activityExecutors; 
 
            lock (executors.SyncRoot)
            { 
                activityExecutors = executors[activityType] as ActivityExecutor[];
                if (activityExecutors != null)
                    return activityExecutors;
 
                object[] activityExecutorsObjects = null;
                try 
                { 
                    //activityExecutorsObjects = ComponentDispenser.CreateComponents(activityType, typeof(ActivityExecutorAttribute));
                    activityExecutorsObjects = ComponentDispenser.CreateActivityExecutors(activity); 
                }
                catch (Exception e)
                {
 					throw new InvalidOperationException(SR.GetString(SR.ExecutorCreationFailedErrorMessage, activityType.FullName), e); 
                }
 
                if (activityExecutorsObjects == null || activityExecutorsObjects.Length == 0) 
					throw new InvalidOperationException(SR.GetString(SR.ExecutorCreationFailedErrorMessage, activityType.FullName));
 
                activityExecutors = new ActivityExecutor[activityExecutorsObjects.Length];
                for (int index = 0; index < activityExecutorsObjects.Length; index++)
                {
                    if (!typeToExecutorMapping.Contains(activityExecutorsObjects[index].GetType())) 
                    {
                        lock (typeToExecutorMapping.SyncRoot) 
                        { 
                            if (!typeToExecutorMapping.Contains(activityExecutorsObjects[index].GetType()))
                            { 
                                System.Threading.Thread.MemoryBarrier();
                                typeToExecutorMapping[activityExecutorsObjects[index].GetType()] = activityExecutorsObjects[index];
                            }
                        } 
                    }
                    activityExecutors[index] = (ActivityExecutor)typeToExecutorMapping[activityExecutorsObjects[index].GetType()]; 
                } 

                System.Threading.Thread.MemoryBarrier(); 
                executors[activityType] = activityExecutors;
            }
            return activityExecutors;
        } 

        public static ActivityExecutor GetActivityExecutorFromType(Type executorType) 
        { 
            if (executorType == null)
                throw new ArgumentNullException("executorType"); 
            if (!typeof(ActivityExecutor).IsAssignableFrom(executorType))
                throw new ArgumentException(
					SR.GetString(SR.Error_NonActivityExecutor, executorType.FullName), "executorType");
 
            ActivityExecutor activityExecutor = typeToExecutorMapping[executorType] as ActivityExecutor;
            if (activityExecutor != null) 
                return activityExecutor; 

            lock (typeToExecutorMapping.SyncRoot) 
            {
                activityExecutor = typeToExecutorMapping[executorType] as ActivityExecutor;
                if (activityExecutor != null)
                    return activityExecutor; 

                System.Threading.Thread.MemoryBarrier(); 
                typeToExecutorMapping[executorType] = Activator.CreateInstance(executorType); 
            }
            return (ActivityExecutor)typeToExecutorMapping[executorType]; 
        }

        public static ActivityExecutor GetActivityExecutor(Activity activity)
        { 
            if (activity == null)
                throw new ArgumentNullException("activity"); 
 
            return GetActivityExecutors(activity)[0];
        } 
    }
    #endregion
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ActivityExecutor.cs source code in C# .NET

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