WorkflowWebHostingModule.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / Hosting / WorkflowWebHostingModule.cs / 1305376 / WorkflowWebHostingModule.cs
                        

                        
                            /******************************************************************************** 
// 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     [....]       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
{
    /// 
    /// Cookie based rotuing module implementation 
    /// 
    public sealed class WorkflowWebHostingModule : IHttpModule 
    { 
        HttpApplication currentApplication;
 
        public WorkflowWebHostingModule()
        {
            WorkflowTrace.Host.TraceEvent(TraceEventType.Information, 0, "Workflow Web Hosting Module Created");
        } 

        ///  
        /// IHttpModule.Init() 
        /// 
        ///  
        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);
                } 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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