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Listing 10.6 NHibernateConversationWebModule for conversations
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public class NHibernateConversationWebModule : IHttpModule { const string NHibernateSessionKey = "NHiA.NHibernateSession"; const string EndOfConversationKey = "NHiA.EndOfConversation"; public static void EndConversationAtTheEndOfThisRequest() { HttpContext.Current.Items[EndOfConversationKey] = true; } public void Init(HttpApplication context) { context.PreRequestHandlerExecute += new EventHandler(OnRequestBeginning); context.PostRequestHandlerExecute += new EventHandler(OnRequestEnding); } public void Dispose() { } private void OnRequestBeginning(object sender, EventArgs e) {
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ISession currentSession = (ISession)HttpContext.Current.Session[NHibernateSessionKey]; if (currentSession == null) {
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Implementing conversations
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currentSession = NHibernateHelper.OpenSession(); currentSession.FlushMode = FlushMode.Never; } CurrentSessionContext.Bind(currentSession); currentSession.BeginTransaction(); ] private void OnRequestEnding(object sender, EventArgs e) {
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ISession currentSession = CurrentSessionContext.Unbind(NHibernateHelper.SessionFactory); if (HttpContext.Current.Items[EndOfConversationKey] != null) { currentSession.Flush(); currentSession.Transaction.Commit(); currentSession.Close(); HttpContext.Current.Session[NHibernateSessionKey] = null; } else { currentSession.Transaction.Commit(); HttpContext.Current.Session[NHibernateSessionKey] = currentSession; }
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Because you ll be storing the NHibernate session in a map, you need a key B to define its location. Because the business logic is responsible for ending the conversation, it needs to call the EndConversationAtTheEndOfTheRequest() method C to set a value in the current context that will be used at the end of the request. The initialization of the module D registers events for the beginning and the end of requests. Note that you aren t using the same events as in listing 11.5 because these let you access the ASP.NET session state. When beginning a new request E, if a conversation is already running, you extract its detached NHibernate session from the ASP.NET session state F. Otherwise G, you start a new conversation by opening a new session. We ll explain why you set its flush mode to never H in the next section. Once you have the NHibernate session of the running conversation, you bind it to the current context I and begin a new transaction. At this point, the conversation is ready to be used anywhere in this web request. When the time comes to end the request J, you detach its NHibernate session from the current context 1). If the value to end the conversation was set 1!, you manually flush the session 1@ to process all the changes made in the conversation, you commit these changes, you close the session, and you then remove the NHibernate session from ASP.NET session state. If the conversation is suspended 1#, you commit the transaction to close its database connection, and you store the session in the ASP.NET session state. This conversation will resume when the next request starts. This implementation isn t complete because the exception-handling part is missing. Refer to the CaveatEmptor source code for an example. Basically, these methods
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should be inside a try/catch statement. When catching an exception, you should roll back the current transaction and detach and then close the current session. There is also another issue that we ll cover in the next section.
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STARTING, CONTINUING, AND ENDING A CONVERSATION
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Now let s see how you can use this conversation module (don t forget to register it). If you recall, in the example the administrator is viewing and then approving an auction. You ll have a conversation that spans two web requests: the first to view the action and the second to approve it. The following ASP.NET web page displays the auction s item when loading (first request), and it provides a button to approve this auction (second request):
public partial class ApproveItem : System.Web.UI.Page { First request //... implicitly starts const string ItemKey = "NHiA.ItemKey"; conversation protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { long itemId = long.Parse(Context.Request.QueryString["Id"]); Item item = itemDAO.FindById(itemId); Session[ItemKey] = item; editItemName.Text = item.Name; // ... Show the item btnApprove.Click += new EventHandler(btnApprove_Click); } } protected void btnApprove_Click(object sender, EventArgs e) { Item item = (Item) Session[ItemKey]; item.Approve(loggedUser);
Second request uses conversation and ends it
NHibernateConversationWebModule.EndConversationAtTheEndOfThisRequest(); Context.Response.Redirect("Default.aspx"); } }
In this example, you store the item in the ASP.NET session state between the requests (don t forget to enable the session). In the case of a Windows application, the implementation of a conversation is simpler because you can store everything locally in memory. It s also possible to mimic this example by using the CallContext class.
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