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/*******************************************************************************
// Copyright (C) 2000-2001 Microsoft Corporation. All rights reserved.
//
// CONTENTS
// Workflow Web Hosting Module.
// DESCRIPTION
// Implementation of Workflow Web Host Module.
// REVISIONS
// Date Ver By Remarks
// ~~~~~~~~~~ ~~~ ~~~~~~~~ ~~~~~~~~~~~~~~
// 02/22/05 1.0 Microsoft Implementation.
* ****************************************************************************/
#region Using directives
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Web;
using System.Collections.Specialized;
using System.Threading;
#endregion
namespace System.Workflow.Runtime.Hosting
{
/// <summary>
/// Cookie based rotuing module implementation
/// </summary>
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public sealed class WorkflowWebHostingModule : IHttpModule
{
HttpApplication currentApplication;
public WorkflowWebHostingModule()
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "Workflow Web Hosting Module Created");
}
/// <summary>
/// IHttpModule.Init()
/// </summary>
/// <param name="application"></param>
void IHttpModule.Init(HttpApplication application)
{
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "Workflow Web Hosting Module Initialized");
this.currentApplication = application;
//Listen for Acquire and ReleaseRequestState event
application.ReleaseRequestState += this.OnReleaseRequestState;
application.AcquireRequestState += this.OnAcquireRequestState;
}
void IHttpModule.Dispose()
{
}
void OnAcquireRequestState(Object sender, EventArgs e)
{
//Performs Cookie based routing.
WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "WebHost Module Routing Begin");
HttpCookie routingCookie = HttpContext.Current.Request.Cookies.Get("WF_WorkflowInstanceId");
if (routingCookie != null)
{
HttpContext.Current.Items.Add("__WorkflowInstanceId__", new Guid(routingCookie.Value));
}
//else no routing information found, it could be activation request or non workflow based request.
}
void OnReleaseRequestState(Object sender, EventArgs e)
{
//Saves cookie back to client.
HttpCookie cookie = HttpContext.Current.Request.Cookies.Get("WF_WorkflowInstanceId");
if (cookie == null)
{
cookie = new HttpCookie("WF_WorkflowInstanceId");
Object workflowInstanceId = HttpContext.Current.Items["__WorkflowInstanceId__"];
if (workflowInstanceId != null)
{
cookie.Value = workflowInstanceId.ToString();
HttpContext.Current.Response.Cookies.Add(cookie);
}
}
}
}
}
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