/// <summary>
/// Removes the session key from internal and DB storage
/// </summary>
/// <param name="sessionKey">The session key of the session to remove</param>
private void RemoveFromStorage(string sessionKey)
{
SessionStoreData session = new SessionStoreData();
session.SessionKey = sessionKey;
this.updatesToStore.Enqueue(session);
if (this.internalStore.ContainsKey(sessionKey))
{
string output = null;
this.internalStore.TryRemove(sessionKey, out output);
}
}
/// <summary>
/// Updates the database based upon SessionStoreData in the UpdatesToStore queue.
/// If the SessioStoreData.SessionData entry is null, the data is removed.
/// Runs in a loop until either Token.IsCancellationRequested is true.
/// Will finish updating the database when we are disposing and there are still updates to store
/// </summary>
private void UpdateDatabase()
{
while (!this.token.IsCancellationRequested || (this.disposing && this.updatesToStore.Count > 0))
{
SessionContext context = new SessionContext();
int count = 0;
if (this.updatesToStore.Count > 0)
{
while (this.updatesToStore.Count > 0 && count < 100)
{
count++;
SessionStoreData session = this.updatesToStore.Dequeue();
if (string.IsNullOrWhiteSpace(session.SessionData))
{
if (context.SessionStore.Any(s => s.SessionKey == session.SessionKey))
{
context.SessionStore.Local.Where(s => s.SessionKey == session.SessionKey).ToList().ForEach(s => context.Entry(s).State = System.Data.Entity.EntityState.Deleted);
}
else
{
// Crashed on duplicate key error
context.Entry(session).State = System.Data.Entity.EntityState.Deleted;
}
}
else// if (this.internalStore.ContainsKey(session.SessionKey))
{
if (context.SessionStore.Local.Any(s => s.SessionKey == session.SessionKey) && context.Entry(context.SessionStore.Local.Where(s => s.SessionKey == session.SessionKey).Single()).State != System.Data.Entity.EntityState.Deleted)
{
context.SessionStore.Local.Where(s => s.SessionKey == session.SessionKey).Single().SessionData = session.SessionData;
}
else if (context.SessionStore.Any(s => s.SessionKey == session.SessionKey))
{
context.Entry(session).State = System.Data.Entity.EntityState.Modified;
}
else
{
context.Entry(session).State = System.Data.Entity.EntityState.Added;
}
}
}
if (count > 0)
{
context.SaveChanges();
}
}
else
{
Thread.Sleep(100);
}
}
}
/// <summary>
/// Updates the interal storage and the database storage and keeps them in sync
/// </summary>
/// <param name="sessionKey">The sessionKey to store</param>
/// <param name="sessionData">The session Data to store</param>
private void UpdateStorage(string sessionKey, string sessionData)
{
SessionStoreData session = new SessionStoreData();
session.SessionKey = sessionKey;
session.SessionData = sessionData;
if (!this.internalStore.ContainsKey(sessionKey))
{
this.internalStore.TryAdd(sessionKey, sessionData);
}
else
{
this.internalStore[sessionKey] = sessionData;
}
this.updatesToStore.Enqueue(session);
}