/// <summary>
/// Creates a new SockIO obj for the given server.
///
///If server fails to connect, then return null and do not try
///again until a duration has passed. This duration will grow
///by doubling after each failed attempt to connect.
/// </summary>
/// <param name="host">host:port to connect to</param>
/// <returns>SockIO obj or null if failed to create</returns>
protected SockIO CreateSocket(string host)
{
SockIO socket = null;
// if host is dead, then we don't need to try again
// until the dead status has expired
// we do not try to put back in if failover is off
if(_failover && _hostDead.ContainsKey(host) && _hostDeadDuration.ContainsKey(host))
{
DateTime store = (DateTime)_hostDead[host];
long expire = ((long)_hostDeadDuration[host]);
if((store.AddMilliseconds(expire)) > DateTime.Now)
return null;
}
try
{
socket = new SockIO(this, host, _socketTimeout, _socketConnectTimeout, _nagle);
if(!socket.IsConnected)
{
//if(Log.IsErrorEnabled)
//{
// Log.Error(GetLocalizedString("failed to get socket").Replace("$$Host$$", host));
//}
try
{
socket.TrueClose();
}
catch//(SocketException ex)
{
//if(Log.IsErrorEnabled)
//{
// Log.Error(GetLocalizedString("failed to close socket on host").Replace("$$Host$$", host), ex);
//}
socket = null;
}
}
}
catch//(SocketException ex)
{
//if(Log.IsErrorEnabled)
//{
// Log.Error(GetLocalizedString("failed to get socket").Replace("$$Host$$", host), ex);
//}
socket = null;
}
//catch(ArgumentException ex)
//{
// if(Log.IsErrorEnabled)
// {
// Log.Error(GetLocalizedString("failed to get socket").Replace("$$Host$$", host), ex);
// }
// socket = null;
//}
//catch(IOException ex)
//{
// if(Log.IsErrorEnabled)
// {
// Log.Error(GetLocalizedString("failed to get socket").Replace("$$Host$$", host), ex);
// }
// socket = null;
//}
// if we failed to get socket, then mark
// host dead for a duration which falls off
if(socket == null)
{
DateTime now = DateTime.Now;
_hostDead[host] = now;
long expire = (_hostDeadDuration.ContainsKey(host)) ? (((long)_hostDeadDuration[host]) * 2) : 100;
_hostDeadDuration[host] = expire;
//if(Log.IsDebugEnabled)
//{
// Log.Debug(GetLocalizedString("ignoring dead host").Replace("$$Host$$", host).Replace("$$Expire$$", expire.ToString(new NumberFormatInfo())));
//}
// also clear all entries for this host from availPool
ClearHostFromPool(_availPool, host);
}
else
{
//if(Log.IsDebugEnabled)
//{
// Log.Debug(GetLocalizedString("created socket").Replace("$$ToString$$", socket.ToString()).Replace("$$Host$$", host));
//}
_hostDead.Remove(host);
_hostDeadDuration.Remove(host);
if(_buckets.BinarySearch(host) < 0)
_buckets.Add(host);
}
return socket;
}
