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using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Collections;
using System.Reflection;
using System.Runtime.Serialization;
using System.Workflow.ComponentModel;
using System.Workflow.Runtime;
using System.Workflow.Runtime.Hosting;
namespace System.Workflow.Activities
{
[Serializable]
internal sealed class CorrelationTokenInvalidatedHandler : IActivityEventListener<CorrelationTokenEventArgs>
{
IActivityEventListener<QueueEventArgs> eventHandler;
EventQueueName queueName;
Guid subscriptionId;
Guid instanceId;
bool queueCreator;
Type interfaceType;
string followerOperation;
internal CorrelationTokenInvalidatedHandler(Type interfaceType, string operation, IActivityEventListener<QueueEventArgs> eventHandler, Guid instanceId)
{
this.eventHandler = eventHandler;
this.interfaceType = interfaceType;
this.followerOperation = operation;
this.instanceId = instanceId;
}
#region IActivityEventListener<CorrelationTokenEventArgs> Members
void IActivityEventListener<CorrelationTokenEventArgs>.OnEvent(object sender, CorrelationTokenEventArgs dataChangeEventArgs)
{
if (sender == null)
throw new ArgumentException("sender");
if (dataChangeEventArgs == null)
throw new ArgumentException("dataChangeEventArgs");
ActivityExecutionContext context = sender as ActivityExecutionContext;
Activity activity = context.Activity;
ICollection<CorrelationProperty> correlationValues = dataChangeEventArgs.CorrelationToken.Properties;
if (dataChangeEventArgs.IsInitializing)
{
CreateSubscription(this.instanceId, context, correlationValues);
return;
}
if (queueName != null)
{
if (!CorrelationResolver.IsInitializingMember(queueName.InterfaceType, queueName.MethodName,
correlationValues == null ? null : new object[] { correlationValues }))
{
DeleteSubscription(context);
}
}
dataChangeEventArgs.CorrelationToken.UnsubscribeFromCorrelationTokenInitializedEvent(activity, this);
}
#endregion
private void CreateSubscription(Guid instanceId, ActivityExecutionContext context, ICollection<CorrelationProperty> correlationValues)
{
WorkflowQueuingService queueSvcs = context.GetService<WorkflowQueuingService>();
EventQueueName queueId = new EventQueueName(this.interfaceType, this.followerOperation, correlationValues);
WorkflowQueue workflowQueue = null;
if (!queueSvcs.Exists(queueId))
{
WorkflowActivityTrace.Activity.TraceEvent(TraceEventType.Information, 0, "CorrelationTokenInvalidatedHandler: creating q {0} ", queueId.GetHashCode());
workflowQueue = queueSvcs.CreateWorkflowQueue(queueId, true);
queueCreator = true;
}
else
{
workflowQueue = queueSvcs.GetWorkflowQueue(queueId);
}
if (this.eventHandler != null)
{
workflowQueue.RegisterForQueueItemAvailable(this.eventHandler);
}
WorkflowSubscriptionService subscriptionService = (WorkflowSubscriptionService)context.GetService(typeof(WorkflowSubscriptionService));
MessageEventSubscription subscription = new MessageEventSubscription(queueId, instanceId);
this.queueName = queueId;
this.subscriptionId = subscription.SubscriptionId;
subscription.InterfaceType = this.interfaceType;
subscription.MethodName = this.followerOperation;
this.interfaceType = null;
this.followerOperation = null;
if (correlationValues != null)
{
foreach (CorrelationProperty property in correlationValues)
{
subscription.CorrelationProperties.Add(property);
}
}
if (this.eventHandler != null)
return;
if (subscriptionService == null)
return;
subscriptionService.CreateSubscription(subscription);
}
private void DeleteSubscription(ActivityExecutionContext context)
{
if (this.queueName == null)
return;
WorkflowQueuingService queueSvcs = context.GetService<WorkflowQueuingService>();
if (queueCreator)
queueSvcs.DeleteWorkflowQueue(this.queueName);
if (this.eventHandler != null)
return;
WorkflowSubscriptionService subscriptionService = context.GetService<WorkflowSubscriptionService>();
if (subscriptionService != null)
subscriptionService.DeleteSubscription(this.subscriptionId);
WorkflowActivityTrace.Activity.TraceEvent(TraceEventType.Information, 0, "CorrelationTokenInvalidatedHandler subscription deleted SubId {0} QueueId {1}", this.subscriptionId, this.queueName);
}
}
}
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