Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / StateMachineSubscription.cs / 1305376 / StateMachineSubscription.cs
#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{ #region Member Variables private Guid _subscriptionId; #endregion Member Variables #region Properties internal Guid SubscriptionId { get { return _subscriptionId; } set { _subscriptionId = value; } } #endregion Properties void IActivityEventListener .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 (); 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 (); WorkflowQueue workflowQueue = workflowQueuingService.GetWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName); workflowQueuingService.DeleteWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName); } internal void Subscribe(ActivityExecutionContext context) { WorkflowQueuingService workflowQueuingService = context.GetService (); WorkflowQueue workflowQueue = workflowQueuingService.GetWorkflowQueue(StateMachineWorkflowActivity.SetStateQueueName); workflowQueue.RegisterForQueueItemAvailable(this); } internal void Unsubscribe(ActivityExecutionContext context) { WorkflowQueuingService workflowQueuingService = context.GetService (); 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 (); 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 } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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