// note: we may have multiple connections with a host, so
// possibly multiple entries per host (each with a different
// id), so we do not use the host as the hashtable key
static public void Add(string host, byte[] id)
{
lock (locker) {
string uid = BitConverter.ToString(id);
ClientSessionInfo si = (ClientSessionInfo)cache[uid];
if (si == null)
{
cache.Add(uid, new ClientSessionInfo(host, id));
}
else if (si.HostName == host)
{
// we already have this and it's still valid
// on the server, so we'll keep it a little longer
si.KeepAlive();
}
else
{
// it's very unlikely but the same session id
// could be used by more than one host. In this
// case we replace the older one with the new one
si.Dispose();
cache.Remove(uid);
cache.Add(uid, new ClientSessionInfo(host, id));
}
}
}
static public bool SetContextFromCache(Context context)
{
lock (locker) {
ClientSessionInfo csi = FromContext(context, true);
if (csi == null)
{
return(false);
}
csi.SetContext(context);
csi.KeepAlive();
return(true);
}
}
static public bool SetContextInCache(Context context)
{
lock (locker) {
// Don't check the validity because the masterKey of the ClientSessionInfo
// can still be null when this is called the first time
ClientSessionInfo csi = FromContext(context, false);
if (csi == null)
{
return(false);
}
csi.GetContext(context);
csi.KeepAlive();
return(true);
}
}
// only called inside the lock
static private ClientSessionInfo FromContext(Context context, bool checkValidity)
{
if (context == null)
{
return(null);
}
byte[] id = context.SessionId;
if ((id == null) || (id.Length == 0))
{
return(null);
}
// do we have a session cached for this host ?
string uid = BitConverter.ToString(id);
ClientSessionInfo si = (ClientSessionInfo)cache[uid];
if (si == null)
{
return(null);
}
// In the unlikely case of multiple hosts using the same
// session id, we just act like we do not know about it
if (context.ClientSettings.TargetHost != si.HostName)
{
return(null);
}
// yes, so what's its status ?
if (checkValidity && !si.Valid)
{
si.Dispose();
cache.Remove(uid);
return(null);
}
// ok, it make sense
return(si);
}
