private static MetaserverResponse Create(MetaRequest request)
{
RequestCreate createRequest = (RequestCreate)request;
MetaserverResponse response;
//Invoca o servidor
try
{
MetadataEntry entry = core.Create(createRequest.FileName, createRequest.NbDataServer, createRequest.ReadQuorum,
createRequest.WriteQuorum, request.ClientId);
response = new MetaserverResponse(ResponseStatus.Success, request, ThisMetaserverId);
response.MetaEntry = entry;
}
catch (Exception ex)
{
response = new MetaserverResponse(ResponseStatus.Exception, request, ThisMetaserverId);
response.Exception = new PadiException(PadiExceptiontType.CreateFile, ex.Message);
}
return(response);
}
public void ReceiveResponse(MetaserverResponse response)
{
Console.WriteLine("Received Response ");
log.Debug(DateTime.Now.Ticks + " ReceiveResponse: " + response);
response.KnownByThisServersList.Add(ThisMetaserverId);
//TODO check threads waiting for this request
//TODO Retirar a thread pendente
int previous = ThisMetaserverId;
while (true)
{
Boolean iAmLast = false;
previous = ViewManager.GetPreviousServerInView(previous, response.KnownByThisServersList, out iAmLast);
if (iAmLast)
{
Console.WriteLine("Source received the ack");
return;
}
{
try
{
//Tentar enviar ao seguinte
//TODO Se ele responder que desconhece, fico à espera do ack. Se ao fim de x tempo nao receber, enviar outra vez
log.Debug(DateTime.Now.Ticks + " [M] Response Sent: " + response.OriginalRequest.FileName);
ConnectToMetaserver(previous).ReceiveResponse(response);
return;
}
catch (SocketException e)
{
//Actualizar a view, esta mensagem tem de ser entregue mas a view tem de ser actualizada,
//O serializer pode ter morrido.
//TODO INVOKE UPDATE VIEW
Console.WriteLine("Previous server fail");
ViewManager.ServerBetray(previous, ThisMetaserverId);
}
}
}
}
//////////////////////////////////// CLient Interface //////////////////////////////////
public String Create(String filename, int nbDataServers, int readQuorum, int writeQuorum)
{
log.Debug(DateTime.Now.Ticks + " Create: " + filename);
Console.WriteLine("#CREATE Create file: " + filename + " nbDataServer: " + nbDataServers + " readQuorum: " + readQuorum + " writeQuorum: " + writeQuorum);
RequestCreate createRequest = new RequestCreate(filename, nbDataServers, readQuorum, writeQuorum);
log.Debug(DateTime.Now.Ticks + " [M] Send Create: " + filename);
MetaserverResponse response = MetaserverClient.SendRequestToMetaserver(createRequest);
//Processar a resposta
MetadataEntry metaEntry = response.MetaEntry;
if (metaEntry != null)
{
Console.WriteLine("#CREATE Create Successeful");
log.Debug(DateTime.Now.Ticks + " Create Done: " + filename);
return(metaEntry.ToString( ));
}
else
{
throw new PadiException(PadiExceptiontType.CreateFile, "Response without entry");
}
}
private static MetaserverResponse Balancing(MetaRequest request)
{
Console.WriteLine("New balancing message");
if (!LoadBalancer.Enabled)
{
Console.WriteLine("Load balance not enable");
return(new MetaserverResponse(ResponseStatus.Success, request, ThisMetaserverId));
}
Console.WriteLine("Load balance enable");
RequestBalancing balancingRequest = (RequestBalancing)request;
MetaserverResponse response;
try
{
core.Balancing(balancingRequest);
response = new MetaserverResponse(ResponseStatus.Success, request, ThisMetaserverId);
}
catch (Exception ex)
{
response = new MetaserverResponse(ResponseStatus.Exception, request, ThisMetaserverId);
response.Exception = new PadiException(PadiExceptiontType.Balancing, ex.Message);
}
return(response);
}
public Boolean ReceiveMetaserverResponse(MetaserverResponse response)
{
return(MetaserverClient.ReceiveMetaserverResponse(response));
}
