public Server()
{
var key = System.Configuration.ConfigurationManager.AppSettings[ConfigurationFactory.SERVER_RING_INDEX_KEY];
ringIndex = Int32.Parse(key);
discoverToken = new PropagateToken(PropagateAction.AddServer, this);
myServer = new CachedServer(this);
}
public void AddZoneServer(IServerExtended server, PropagateToken token)
{
logger.Info("Adding zone server with index {0}", server.RingIndex);
lock (knownServers)
{
checkRingData(server);
if (!knownServers.ContainsKey(server.GetUID()))
{
CachedServer cached = new CachedServer(server);
knownServers.Add(cached.UID, cached);
}
nextRingServer = getNextServerOnRing();
}
SendServerAction(token);
}
public void RemoveZoneServer(string serverUid, PropagateToken token)
{
CachedServer cachedServer;
if (!knownServers.TryGetValue(serverUid, out cachedServer))
{
logger.Info("Cannot remove unknown server with uid {0}", serverUid);
return;
}
logger.Info("Removing zone server with index {0}", cachedServer.RingIndex);
lock (knownServers)
{
knownServers.Remove(cachedServer.UID);
if (cachedServer.UID == nextRingServer.UID)
{
nextRingServer = getNextServerOnRing();
}
}
SendServerAction(token);
}
/**
* <summary>
* Discovery process is done by acquiring a list of possible ring servers from a config file.
* Then it asks a complete server list for the ring one server on the config file.
* A server is only considered to be in the ring if, when sending the the AddZoneServer token, it arrives with the same list of objects retreived from the server
* The first server shall not have any servers on the configuration file, so it assumes the ring is empty
* </summary>
**/
private void registerAndDiscoverRingServers()
{
logger.Info("Starting discovery process");
var configInfo = getServersFromFile();
if (configInfo.Count() == 0)
{
logger.Info("No servers on config file. Assuming empty ring");
nextRingServer = myServer;
return; //Considered first ring server
}
var ringServerProxies = getRingServers(configInfo);
logger.Info("Got ring server list with {0} entries", ringServerProxies.Count());
foreach (var proxy in ringServerProxies)
{
var server = new CachedServer(proxy);
if (server.RingIndex == this.RingIndex)
{
logger.Error("Server with ring index {0} already exist. Aborting.", server.RingIndex);
throw new DiscoveryException();
}
knownServers.Add(proxy.GetUID(), server);
}
nextRingServer = getNextServerOnRing();
logger.Info("Trying to register server on ring");
SendServerAction(discoverToken);
}
