Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Workflow.Runtime/Hosting/WorkflowWebHostingModule.cs

@@ -0,0 +1,96 @@
+/*******************************************************************************
+// 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
+{
+    /// <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);
+                }
+            }            
+        }        
+    }   
+}