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#region Using directives
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Reflection;
using System.Diagnostics;
using System.Runtime.Remoting.Messaging;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Workflow.Runtime;
using System.Workflow.Runtime.Hosting;
#endregion Using directives
namespace System.Workflow.Activities
{
#region StateMachineSubscription
[Serializable]
internal abstract class StateMachineSubscription : IActivityEventListener<QueueEventArgs>
{
#region Member Variables
private Guid _subscriptionId;
#endregion Member Variables
#region Properties
internal Guid SubscriptionId
{
get
{
return _subscriptionId;
}
set
{
_subscriptionId = value;
}
}
#endregion Properties
void IActivityEventListener<QueueEventArgs>.OnEvent(object sender, QueueEventArgs e)
{
ActivityExecutionContext context = sender as ActivityExecutionContext;
if (context == null)
throw new ArgumentException(SR.Error_SenderMustBeActivityExecutionContext, "sender");
Enqueue(context);
}
protected abstract void Enqueue(ActivityExecutionContext context);
internal abstract void ProcessEvent(ActivityExecutionContext context);
}
#endregion StateMachineSubscription
#region EventActivitySubscription
[Serializable]
internal class EventActivitySubscription : StateMachineSubscription
{
#region Member Variables
private string _eventActivityName = String.Empty;
private string _eventDrivenName = String.Empty;
private string _stateName = String.Empty;
private IComparable _queueName;
#endregion Member Variables
#region Properties
internal string EventActivityName
{
get
{
return _eventActivityName;
}
}
internal string StateName
{
get
{
return _stateName;
}
}
internal IComparable QueueName
{
get
{
return _queueName;
}
}
internal string EventDrivenName
{
get
{
return _eventDrivenName;
}
}
#endregion Properties
internal void Subscribe(ActivityExecutionContext context,
StateActivity state,
IEventActivity eventActivity)
{
eventActivity.Subscribe(context, this);
Activity activity = (Activity)eventActivity;
this._queueName = eventActivity.QueueName;
this._eventActivityName = activity.QualifiedName;
this._stateName = state.QualifiedName;
this.SubscriptionId = Guid.NewGuid();
EventDrivenActivity eventDriven = StateMachineHelpers.GetParentEventDriven(eventActivity);
this._eventDrivenName = eventDriven.QualifiedName;
}
internal void Unsubscribe(ActivityExecutionContext context,
IEventActivity eventActivity)
{
eventActivity.Unsubscribe(context, this);
}
protected override void Enqueue(ActivityExecutionContext context)
{
StateActivity rootState = StateMachineHelpers.GetRootState((StateActivity)context.Activity);
StateMachineExecutionState executionState = StateMachineExecutionState.Get(rootState);
executionState.SubscriptionManager.Enqueue(context, this.QueueName);
}
internal override void ProcessEvent(ActivityExecutionContext context)
{
StateActivity rootState = StateMachineHelpers.GetRootState((StateActivity)context.Activity);
StateMachineExecutionState executionState = StateMachineExecutionState.Get(rootState);
ExternalEventAction action = new ExternalEventAction(this.StateName, this.EventDrivenName);
Debug.Assert(!executionState.HasEnqueuedActions);
executionState.EnqueueAction(action);
executionState.ProcessActions(context);
}
}
#endregion EventActivitySubscription
#region SetStateSubscription
[Serializable]
internal class SetStateSubscription : StateMachineSubscription
{
private Guid _instanceId;
internal SetStateSubscription(Guid instanceId)
{
this._instanceId = instanceId;
}
internal void CreateQueue(ActivityExecutionContext context)
{
if (!StateMachineHelpers.IsRootExecutionContext(context))
{
// we only subscribe to the set state event if
// we're at the root level. If this instance is
// being called, it is not possible to set the
// state from the host side directly
return;
}
WorkflowQueuingService workflowQueuingService = context.GetService<WorkflowQueuingService>();
MessageEventSubscription subscription = new MessageEventSubscription(
StateMachineWorkflowActivity.SetStateQueueName,
this._instanceId);
WorkflowQueue workflowQueue = workflowQueuingService.CreateWorkflowQueue(
StateMachineWorkflowActivity.SetStateQueueName,
true);
this.SubscriptionId = subscription.SubscriptionId;
}
internal void DeleteQueue(ActivityExecutionContext context)
{
if (!StateMachineHelpers.IsRootExecutionContext(context))
{
// we only subscribe to the set state event if
// we're at the root level. If this instance is
// being called, it is not possible to set the
// state from the host side directly
return;
}
WorkflowQueuingService workflowQueuingService = context.GetService<WorkflowQueuingService>();
WorkflowQueue workflowQueue = workflowQueuingService.GetWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName);
workflowQueuingService.DeleteWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName);
}
internal void Subscribe(ActivityExecutionContext context)
{
WorkflowQueuingService workflowQueuingService = context.GetService<WorkflowQueuingService>();
WorkflowQueue workflowQueue = workflowQueuingService.GetWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName);
workflowQueue.RegisterForQueueItemAvailable(this);
}
internal void Unsubscribe(ActivityExecutionContext context)
{
WorkflowQueuingService workflowQueuingService = context.GetService<WorkflowQueuingService>();
WorkflowQueue workflowQueue = workflowQueuingService.GetWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName);
workflowQueue.UnregisterForQueueItemAvailable(this);
}
protected override void Enqueue(ActivityExecutionContext context)
{
StateActivity rootState = StateMachineHelpers.GetRootState((StateActivity)context.Activity);
StateMachineExecutionState executionState = StateMachineExecutionState.Get(rootState);
executionState.SubscriptionManager.Enqueue(context, this.SubscriptionId);
}
internal override void ProcessEvent(ActivityExecutionContext context)
{
WorkflowQueuingService workflowQueuingService = context.GetService<WorkflowQueuingService>();
WorkflowQueue workflowQueue = workflowQueuingService.GetWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName);
SetStateEventArgs eventArgs = workflowQueue.Dequeue() as SetStateEventArgs;
StateActivity currentState = StateMachineHelpers.GetCurrentState(context);
if (currentState == null)
throw new InvalidOperationException(SR.GetStateMachineWorkflowMustHaveACurrentState());
StateActivity rootState = StateMachineHelpers.GetRootState((StateActivity)context.Activity);
StateMachineExecutionState executionState = StateMachineExecutionState.Get(rootState);
SetStateAction action = new SetStateAction(currentState.QualifiedName, eventArgs.TargetStateName);
Debug.Assert(!executionState.HasEnqueuedActions);
executionState.EnqueueAction(action);
executionState.ProcessActions(context);
}
}
#endregion SetStateSubscription
}
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