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http://www.contoso.com/test/(session_id)/page.aspx
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How can a request for this fake URL be served correctly In the case of a cookieless session, the Session ID module depends on a small and simple ISAPI filter (aspnet_filter.dll, which is also available to ASP.NET 1.x) to dynamically remove the session ID from the request URL. In this case, the request is served correctly, but the path on the address bar doesn t change. The removed session ID is placed in a request header named AspFilterSessionId. If the filter is disabled on the Web server machine, a custom Session ID module is called to replace it. You can do this by using a handler that subscribes to the HttpApplication.BeginRequest event. Table 9-2 details the methods available on the ISessionIDModule interface. You should implement all of them if you want to install your own ID generator.
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Table 9-2
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Methods of the ISessionIDModule Interface
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Description Creates a unique session identifier for the session Gets the session ID from the context of the current request Deletes the session ID from the cookie or from the URL Saves a newly created session ID to the HTTP response Confirms that the session ID is valid
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Method CreateSessionID GetSessionID RemoveSessionID SaveSessionID Validate
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9 State Management
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Once you have created a custom session ID module, you register it in the configuration file. Here s how to do it:
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<httpModules> <remove name="SessionID /> <add name="MySessionID type="Samples.MyIDModule, MyLib /> </httpModules>
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You first remove the default session ID HTTP module and then add your own.
Writing a Custom Session State Module
A custom session state module is an HTTP module class that intercepts three key application events AcquireRequestState, ReleaseRequestState, and EndRequest. Capturing these events is mandatory not so much because you would otherwise get error messages or runtime exceptions, but because without them you couldn t implement a serious session state module.
Initialization of the Module
An HTTP module implements the IHttpModule interface, which consists of two methods, Init and Dispose. In the Init method, you start by reading any configuration information from the web.config file. Based on that, you configure the state of the module and prepare it for handling the current configuration. In the Init method, the module also subscribes to the aforementioned application events and gets a reference to the session ID module to use. A reference to the currently loaded module that implements the ISessionIDModule interface can be obtained through the following code:
ISessionIDModule idModule; HttpApplication app = HttpContext.Current.ApplicationInstance; idModule = SessionStateUtility.GetSessionIDModule(app);
The GetSessionIDModule method on the SessionStateUtility helper class just returns the current session ID module, which is then stored in an internal variable for further use. Next the module instantiates and initializes the session provider object by calling the Init method on the SessionStateStoreProviderBase object, which any session provider must inherit.
Acquiring Session State
When the AcquireRequestState event fires, the module retrieves the session ID for the request by calling the GetSessionID method (listed earlier in Table 9-2). In implementing this method, you should take into account cookies or implement alternative schemes for client storage of the session ID. If no session ID is
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Part III
Application Services
found, the module creates a new ID and saves it to the Response object. You save the newly created session ID to the Response object by calling SaveSessionID on the ISessionIDModule interface. The following pseudocode shows how to store the session ID using a cookie:
string cookieText = UrlEncode(id); HttpCookie cookie = new HttpCookie(cookieName, cookieText); cookie.Path = /"; context.Response.Cookies.Add(cookie);
After retrieving the session ID, the module connects to the data store and retrieves the data associated with the given ID. This data is stored in a class such as the SessionStateStoreData class you saw earlier. Using the session data obtained in the previous step, you create a session state object a dictionary that will be bound to the context of the current request and will be made available to applications through the Session property. Finally, if this is a new session, the Start event should be raised.
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