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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)]
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public sealed class ParallelActivity : CompositeActivity, IActivityEventListener<ActivityExecutionStatusChangedEventArgs>
{
#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<ActivityExecutionStatusChangedEventArgs> Members
void IActivityEventListener<ActivityExecutionStatusChangedEventArgs>.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
}
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