/// <summary>
/// backup-consider message sending subroutine
/// not considering posibility of simultaneous
/// failure of main and backup server (too improbable for this project)
/// </summary>
/// <param name="client">cliet</param>
/// <param name="requests"></param>
/// <returns></returns>
public virtual Message[] SendMessages(IClusterClient client, Message[] requests)
{
Message[] responses;
try
{
responses = client.SendRequests(requests);
}
catch (Exception)
{
if (backups != null && backups.Length == 0)
{
throw new Exception("Critical client failure. Server timeout" +
" and no backups specified");
}
try
{
Console.WriteLine("Server not responding. Changing to params {0}, {1}"
, backups[0].address, backups[0].port);
client.ChangeListenerParameters(backups[0].address, backups[0].port);
currentPort = backups[0].port;
currentAddress = backups[0].address;
Thread.Sleep(5000);
responses = client.SendRequests(requests);
}
catch (Exception)
{
throw new Exception("Critical client failure. Server timeout " +
"and primary backup timeout");
}
}
return(responses);
}
/// <summary>
/// Registers backoup server.
/// </summary>
private void RegisterBackupServer()
{
var register = new Register()
{
Type = new RegisterType()
{
Value = ComponentType.CommunicationServer,
port = (ushort)Properties.Settings.Default.Port,
portSpecified = true
},
SolvableProblems = new[] { "DVRP" },
ParallelThreads = 1,
Deregister = false,
DeregisterSpecified = false
};
try
{
var response = _backupClient.SendRequests(new Message[] { register });
foreach (var message in response)
{
_messageProcessor.ProcessMessage(message, _problemDataSets, _activeComponents);
if (message.MessageType == MessageType.RegisterResponseMessage)
{
var registerResponse = message.Cast <RegisterResponse>();
BackupServerStatusInterval = registerResponse.Timeout;
BackupServerId = registerResponse.Id;
}
if (message.MessageType == MessageType.NoOperationMessage)
{
NoOperation nop = message.Cast <NoOperation>();
//current positon of backup in hierarchy (1 for first backup, etc...)
int pos = nop.BackupServersInfo.Length;
_backups = nop.BackupServersInfo.ToList();
//if youre not first backup, switch listener params to higher
if (pos > 1)
{
Log.DebugFormat("changing parameters to : {0}, {1}", _backups[pos - 1].address, _backups[pos - 1].port);
_backupClient.ChangeListenerParameters
(_backups[pos - 2].address, _backups[pos - 2].port);
}
}
}
}
catch (SocketException) //probably Exception might be written here
{
//TODO: Exception caugth. Something went wrong, so we should react here
//TODO: Default reaction would be critical exit here.
//TODO: Or maybe make this seerver primary?
throw;
}
}
public override Message[] SendMessages(IClusterClient client, Message[] requests)
{
client.ChangeListenerParameters(currentAddress, currentPort);
return(base.SendMessages(client, requests));
}
