| public static GenerateDocumentId ( string sessionId, string applicationName ) : string | ||
| sessionId | string | |
| applicationName | string | |
| return | string | |
/// <summary>
/// deletes the session information from the data store where the data store item matches the supplied SessionID value,
/// the current application, and the supplied lock identifier.
/// </summary>
/// <param name="context">The HttpContext instance for the current request</param>
/// <param name="sessionId">The session identifier.</param>
/// <param name="lockId">The exclusive-lock identifier.</param>
/// <param name="item"></param>
public override void RemoveItem(HttpContext context, string sessionId, object lockId, SessionStateStoreData item)
{
try
{
Logger.Debug("Beginning RemoveItem. SessionId={0}; Application={1}; lockId={2}.", sessionId,
ApplicationName, lockId);
using (var documentSession = _documentStore.OpenSession())
{
//don't tolerate stale data
documentSession.Advanced.AllowNonAuthoritativeInformation = false;
var sessionStateDocument = documentSession
.Load <SessionStateDocument>(SessionStateDocument.GenerateDocumentId(sessionId, ApplicationName));
if (sessionStateDocument != null && sessionStateDocument.LockId == (int)lockId)
{
documentSession.Delete(sessionStateDocument);
documentSession.SaveChanges();
}
}
Logger.Debug("Completed RemoveItem. SessionId={0}; Application={1}; lockId={2}.", sessionId,
ApplicationName, lockId);
}
catch (Exception ex)
{
Logger.ErrorException(string.Format("Error during RemoveItem. SessionId={0}; Application={1}; lockId={2}", sessionId, ApplicationName, lockId), ex);
throw;
}
}
/// <summary>
/// Releases the lock on an item in the session data store.
/// </summary>
/// <param name="context">The HttpContext instance for the current request</param>
/// <param name="sessionId">The session identifier.</param>
/// <param name="lockId">The lock identifier for the current request.</param>
public override void ReleaseItemExclusive(HttpContext context, string sessionId, object lockId)
{
try
{
Logger.Debug("Beginning ReleaseItemExclusive. SessionId={0}; Application={1}; LockId={2}.", sessionId, ApplicationName, lockId);
using (var documentSession = _documentStore.OpenSession())
{
//don't tolerate stale data
documentSession.Advanced.AllowNonAuthoritativeInformation = false;
var sessionState =
documentSession
.Load <SessionStateDocument>(SessionStateDocument.GenerateDocumentId(sessionId, ApplicationName));
//if the session-state is not present (it may have expired and been removed) or
//the locked id does not match, then we do nothing
if (sessionState == null || sessionState.LockId != (int)lockId)
{
Logger.Debug(
"Session state was not present or lock id did not match. Session id: {0}; Application: {1}; Lock id: {2}.",
sessionId, ApplicationName, lockId);
return;
}
sessionState.Locked = false;
//update the expiry
var expiry = DateTime.UtcNow.AddMinutes(SessionStateConfig.Timeout.TotalMinutes);
sessionState.Expiry = expiry;
documentSession.Advanced.GetMetadataFor(sessionState)["Raven-Expiration-Date"] = new RavenJValue(expiry);
documentSession.SaveChanges();
}
Logger.Debug("Completed ReleaseItemExclusive. SessionId={0}; Application={1}; LockId={2}.", sessionId, ApplicationName, lockId);
}
catch (Exception ex)
{
Logger.ErrorException(string.Format("Error during ReleaseItemExclusive. SessionId={0}; Application={1}; LockId={2}.", sessionId, ApplicationName, lockId), ex);
throw;
}
}
/// <summary>
/// Resets the expiry timeout for a session item.
/// </summary>
/// <param name="context">The HttpContext instance for the current request</param>
/// <param name="sessionId">The session identifier.</param>
public override void ResetItemTimeout(HttpContext context, string sessionId)
{
try
{
Logger.Debug("Beginning ResetItemTimeout. SessionId={0}; Application={1}.", sessionId, ApplicationName);
using (var documentSession = _documentStore.OpenSession())
{
//we never want to over-write data with this method
documentSession.Advanced.UseOptimisticConcurrency = true;
var sessionStateDocument = documentSession
.Load <SessionStateDocument>(SessionStateDocument.GenerateDocumentId(sessionId, ApplicationName));
if (sessionStateDocument != null)
{
var expiry = DateTime.UtcNow.AddMinutes(SessionStateConfig.Timeout.TotalMinutes);
sessionStateDocument.Expiry = expiry;
documentSession.Advanced.GetMetadataFor(sessionStateDocument)["Raven-Expiration-Date"] =
new RavenJValue(expiry);
documentSession.SaveChanges();
}
}
Logger.Debug("Completed ResetItemTimeout. SessionId={0}; Application={1}.", sessionId, ApplicationName);
}
catch (ConcurrencyException ex)
{
//swallow, we don't care
}
catch (Exception ex)
{
Logger.ErrorException("Error during ResetItemTimeout. SessionId=" + sessionId, ex);
throw;
}
}
//
// GetSessionStoreItem is called by both the GetItem and
// GetItemExclusive methods. GetSessionStoreItem retrieves the
// session data from the data source. If the lockRecord parameter
// is true (in the case of GetItemExclusive), then GetSessionStoreItem
// locks the record and sets a new LockId and LockDate.
//
private SessionStateStoreData GetSessionStoreItem(bool lockRecord,
HttpContext context,
string sessionId,
out bool locked,
out TimeSpan lockAge,
out object lockId,
out SessionStateActions actionFlags)
{
// Initial values for return value and out parameters.
lockAge = TimeSpan.Zero;
lockId = null;
locked = false;
actionFlags = 0;
using (var documentSession = _documentStore.OpenSession())
{
//don't tolerate stale data
documentSession.Advanced.AllowNonAuthoritativeInformation = false;
Logger.Debug("Retrieving item from RavenDB. SessionId: {0}; Application: {1}.", sessionId, ApplicationName);
var sessionState = documentSession.Load <SessionStateDocument>(SessionStateDocument.GenerateDocumentId(sessionId, ApplicationName));
if (sessionState == null)
{
Logger.Debug("Item not found in RavenDB with SessionId: {0}; Application: {1}.", sessionId, ApplicationName);
return(null);
}
//if the record is locked, we can't have it.
if (sessionState.Locked)
{
Logger.Debug("Item retrieved is locked. SessionId: {0}; Application: {1}.", sessionId, ApplicationName);
locked = true;
lockAge = DateTime.UtcNow.Subtract((DateTime)sessionState.LockDate);
lockId = sessionState.LockId;
return(null);
}
//generally we shouldn't get expired items, as the expiration bundle should clean them up,
//but just in case the bundle isn't installed, or we made the window, we'll delete expired items here.
if (DateTime.UtcNow > sessionState.Expiry)
{
Logger.Debug("Item retrieved has expired. SessionId: {0}; Application: {1}; Expiry (UTC): {2}", sessionId, ApplicationName, sessionState.Expiry);
try
{
documentSession.Delete(sessionState);
documentSession.SaveChanges();
}
catch (Exception ex)
{
//we never want this clean-up op to throw
Logger.DebugException("Exception thrown while attempting to remove expired item.", ex);
}
return(null);
}
if (lockRecord)
{
sessionState.Locked = true;
sessionState.LockId += 1;
sessionState.LockDate = DateTime.UtcNow;
documentSession.SaveChanges();
}
lockId = sessionState.LockId;
return
(sessionState.Flags == SessionStateActions.InitializeItem
? new SessionStateStoreData(new SessionStateItemCollection(),
GetSessionStaticObjects(context),
(int)SessionStateConfig.Timeout.TotalMinutes)
: Deserialize(context, sessionState.SessionItems, (int)SessionStateConfig.Timeout.TotalMinutes));
}
}
/// <summary>
/// If the newItem parameter is true, the SetAndReleaseItemExclusive method inserts a new item into the data store with the supplied values.
/// Otherwise, the existing item in the data store is updated with the supplied values, and any lock on the data is released.
/// </summary>
/// <param name="context">The HttpContext instance for the current request</param>
/// <param name="sessionId">The session identifier.</param>
/// <param name="item">The current session values to be stored</param>
/// <param name="lockId">The lock identifier for the current request.</param>
/// <param name="newItem">If true, a new item is inserted into the store. Otherwise, the existing item in
/// the data store is updated with the supplied values, and any lock on the data is released. </param>
public override void SetAndReleaseItemExclusive(HttpContext context, string sessionId, SessionStateStoreData item,
object lockId, bool newItem)
{
try
{
Logger.Debug(
" Beginning SetAndReleaseItemExclusive. SessionId={0}, Application: {1}, LockId={2}, newItem={3}.",
sessionId, ApplicationName, lockId, newItem);
if (item == null)
{
throw new ArgumentNullException("item");
}
var serializedItems = Serialize((SessionStateItemCollection)item.Items);
using (var documentSession = _documentStore.OpenSession())
{
//don't tolerate stale data
documentSession.Advanced.AllowNonAuthoritativeInformation = false;
SessionStateDocument sessionStateDocument;
if (newItem) //if we are creating a new document
{
sessionStateDocument = new SessionStateDocument(sessionId, ApplicationName);
documentSession.Store(sessionStateDocument);
}
else //we are not creating a new document, so load it
{
sessionStateDocument =
documentSession.Load <SessionStateDocument>(SessionStateDocument.GenerateDocumentId(sessionId, ApplicationName));
//if the lock identifier does not match, then we don't modifiy the data
if (sessionStateDocument.LockId != (int)lockId)
{
Logger.Debug(
"Lock Id does not match, so data will not be modified. Session Id: {0}; Application: {1}; Lock Id {2}.",
sessionId, ApplicationName, lockId);
return;
}
}
sessionStateDocument.SessionItems = serializedItems;
sessionStateDocument.Locked = false;
//set the expiry
var expiry = DateTime.UtcNow.AddMinutes(SessionStateConfig.Timeout.TotalMinutes);
sessionStateDocument.Expiry = expiry;
documentSession.Advanced.GetMetadataFor(sessionStateDocument)["Raven-Expiration-Date"] = new RavenJValue(expiry);
documentSession.SaveChanges();
}
Logger.Debug("Completed SetAndReleaseItemExclusive. SessionId={0}; Application:{1}; LockId={2}; newItem={3}.", sessionId, ApplicationName, lockId, newItem);
}
catch (Exception ex)
{
Logger.ErrorException(string.Format("Error during SetAndReleaseItemExclusive. SessionId={0}; Application={1}; LockId={2}, newItem={3}.", sessionId, ApplicationName, lockId, newItem), ex);
throw;
}
}