Re: Problems with a wrapper class for session object (revisited)

From: Nicole Calinoiu (calinoiu)
Date: 11/09/04 

Date: Tue, 9 Nov 2004 08:22:09 -0500

How exactly are you loading the lists? Also, is your code reading from the
session-stored lists at some point and, if so, how? (In both cases, "how"
is really a request to show the relevant code.)

"John Mullin" <john.mullin@gmail.com> wrote in message
news:9818481.0411071429.66200595@posting.google.com...
> We are having a problem which appears similar to a previous posting:
>
> http://groups.google.com/groups?hl=en&lr=&frame=right&th=d97f552e10f8c94c&seekm=OZw33z9EDHA.2312%40TK2MSFTNGP10.phx.gbl#link1
>
> In the current release of our system, we decided to "wrap" the ASP.NET
> Session and Application objects to improve code clarity and accuracy.
> For example, instead of:
>
> Session["List1"] = new SomeListClass;
>
> we provide a wrapper class, with Session variables accessed via
> properties:
>
> UserSession session = new UserSession(context);
> session.List1 = new SomeListClass();
>
> Under normal load, the application works fine. However, when we load
> test (using Microsoft Application Center Test), after about 30sec, we
> start getting internal server errors (500). (Previous load testing,
> before the introduction of the wrapper class, was OK).
>
> I have include some example calling code, an example UserSession
> class, and a Performance Monitor trace (we are using w2k3, so
> apologies if you can't read this, after you cut and paste the
> contents).
>
> Counter "IO Read Operations/sec" shows where things start to go
> seriously wrong (about half-way in the graph).
>
> Thanks
> John
>
> // Calling code...
>
> /////////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Execute the service.
> /// </summary>
> /////////////////////////////////////////////////////////////////////////////////////
> public override void Execute(HttpContext context)
> {
> // Create a user session object.
> UserSession session = new UserSession(context);
> ...
>
> // Create and load a List1 object.
> session.List1 = new SomeListClass();
> session.List1.Load(<params>);
>
> // Create and load a List2 object.
> session.List2 = new SomeListClass();
> session.List2.Load(<params>);
>
> ...
> }
>
> // UserSession class...
>
> /////////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// A class for accessing properties of the user's session state.
> /// </summary>
> /////////////////////////////////////////////////////////////////////////////////////
> public class UserSession
> {
>
> /////////////////////////////////////////////////////////////////////////////////
> // Constants for the item keys.
>
> /////////////////////////////////////////////////////////////////////////////////
> private const string List1Key = "List1";
> private const string List2Key = "List2";
>
>
> /////////////////////////////////////////////////////////////////////////////////
> // Private variables.
>
> /////////////////////////////////////////////////////////////////////////////////
> private HttpContext _context;
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Property accessor for the context.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> public HttpContext Context
> {
> get { return _context; }
> set { _context = value; }
> }
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Constructor.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> public UserSession(HttpContext context)
> {
> _context = context;
> }
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Get a value from the HTTP session.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> protected object GetValue(string key)
> {
> return _context.Session[key];
> }
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Set a value in the HTTP session.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> protected void SetValue(string key, object value)
> {
> _context.Session[key] = value;
> }
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Initialise the session.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> public void Init()
> {
> // Set some defaults (whatever).
> }
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Property accessor for List1.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> public SomeListClass List1
> {
> get { return (SomeListClass)GetValue(List1Key); }
> set { SetValue(List1Key, value); }
> }
>
>
> /////////////////////////////////////////////////////////////////////////////////
> /// <summary>
> /// Property accessor for List1.
> /// </summary>
>
> /////////////////////////////////////////////////////////////////////////////////
> public SomeListClass List2
> {
> get { return (SomeListClass)GetValue(List2Key); }
> set { SetValue(List2Key, value); }
> }
>
> ...
> }
>
> // Performance Monitor Trace
>
> <HTML>
> <HEAD>
> <META HTTP-EQUIV="Content-Type" CONTENT="text/html;" />
> <META NAME="GENERATOR" Content="Microsoft System Monitor" />
> </HEAD>
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