Skip to main content

Web application end - how to determine why has stopped

By
Sa spunem ca avem o aplicatie web care se afla pe IIS. Observam ca aplicatia uneori moare si nu reusimg sa ne dam seama din ce cauza. Din anumite motive "exceptia" care se intampla in aplicatie nu poate sa fie prinsa si aplicația moare fără sa logeze nici o informație. De ce spun "exceptie", deoarece uneori poate sa fie vorba de un pool recycle care sa genereze acest comportament( cauza nu este mereu o exceptie in adevaratul sens al cuvântului).
Ce putem face? O solutie este ca in Global.asax.cs, in metoda Application_End sa obtinem date despre motivul pentru care aplicatie se termina si sa scriem aceste date in trace sau sa le logam undeva. Aceasta metoda o sa fie apelata de fiecare data cand aplicatia este oprita. Din pacate informatiile pentru care aplicatia este oprita se pot obtine doar prin intermedul reflection. Nu avem o alta modalitate sa obtinem aceste date. Daca aplicatia primeste un semnal din exterior ca trebuie sa se opreasca metoda Application_Error nu o sa fie apelata.
Mai jos gasiti un exemplu de implementare a metodei Application_End: 
 public void Application_End()
        {
            HttpRuntime runtime = (HttpRuntime)typeof(System.Web.HttpRuntime).InvokeMember("_theRuntime",
                                                                                             BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.GetField,
                                                                                             null, null, null);
            if (runtime == null)
            {
                return;
            }

            string message = (string)runtime.GetType().InvokeMember("_shutDownMessage",
                                                                                 BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetField,
                                                                                 null, runtime, null);

            string stackTrace = (string)runtime.GetType().InvokeMember("_shutDownStack",
                                                                           BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetField,
                                                                           null, runtime, null);

            Trace.WriteLine(string.Format("Application_End: {0} {1}", message, stackTrace));

        }
Enjoy!
Labels:

Comments

  1. Andrei RineaJune 7, 2012 at 1:06 PM

    Un mic dezavantaj : datorita folosirii reflection pentru a citi membrii privati/protejati, codul de mai sus nu va rula in medium trust.

    ReplyDelete
    Replies
    1. Radu VunvuleaJune 7, 2012 at 1:15 PM

      Sticumva o alta solutie la aceasta problema fara sa folosim reflection?

      Delete

Post a Comment

Popular posts from this blog

How to audit an Azure Cosmos DB

By
In this post, we will talk about how we can audit an Azure Cosmos DB database. Before jumping into the problem let us define the business requirement: As an Administrator I want to be able to audit all changes that were done to specific collection inside my Azure Cosmos DB. The requirement is simple, but can be a little tricky to implement fully. First of all when you are using Azure Cosmos DB or any other storage solution there are 99% odds that you’ll have more than one system that writes data to it. This means that you have or not have control on the systems that are doing any create/update/delete operations. Solution 1: Diagnostic Logs Cosmos DB allows us activate diagnostics logs and stream the output a storage account for achieving to other systems like Event Hub or Log Analytics. This would allow us to have information related to who, when, what, response code and how the access operation to our Cosmos DB was done. Beside this there is a field that specifies what was th...
Post a Comment
Read more

Can User Technical Profile Influence AI Architecture Decisions?

By
In the last few days, I ran a small experiment on Devin/Windsurf/Cascade, BMAD, and LLM-based architecture decisions. The initial concern was simple: if an AI coding assistant knows something about the user, for example, that the user is a Java developer or a .NET developer, can this information influence the architecture and technology stack that the AI will propose? This question is important because many companies are starting to use AI tools not only for coding but also for product discovery, architecture, documentation, and technical decision-making. If the AI is influenced by the developer's personal profile, the result may not be fully neutral. It may look like a business or architecture decision, but in reality, it may be partially shaped by the context of the person using the tool. The test was done using BMAD with Devin/Windsurf/Cascade. The scenario was a unified field service operations platform. The task was to let BMAD refine the product, define the architecture and s...
Post a Comment
Read more

ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

By
Today blog post will be started with the following error when running DB tests on the CI machine: threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information. at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) This error happened only on the Continuous Integration machine. On the devs machines, everything has fine. The classic problem – on my machine it’s working. The CI has the following configuration: TeamCity .NET 4.51 EF 6.0.2 VS2013 It see...
8 comments
Read more