/// <summary>
/// Creating a new KetamaServer object based on the server IP:port/weight information passed in.
/// The new KetamaServer object will get saved to the list of KetamaServer objects called server
/// </summary>
/// <param name="serverIP">A server IP:port/weight value</param>
public void AddServerToServers(string serverIP)
{
string serverRedisName = "redis" + (serverNames.Count() + 1); //Should resolve to some name like 'redis1' or 'redis2', etc.
KetamaServer newServer = new KetamaServer(serverIP, serverRedisName); //Since we're making a new server, we create a new server object. Pass in the serverIP (e.g. '10.10.10.10:1234') and the given redis name (e.g. 'redis1')
servers.Add(newServer); //Add that new server to our list of servers
serverNames.Add(serverRedisName, newServer.serverIP); //Setting the server name to redisX (where X is an integer) and having it be associated with the IP address
}
/// <summary>
/// Creating a new KetamaServer object based on the server IP:port/weight information passed in.
/// The new KetamaServer object will get saved to the list of KetamaServer objects called server
/// </summary>
/// <param name="serverIP">A server IP:port/weight value</param>
public void AddServerToServers(string serverIP)
{
string serverRedisName = "redis" + (serverNames.Count() + 1); //Should resolve to some name like 'redis1' or 'redis2', etc.
KetamaServer newServer = new KetamaServer(serverIP, serverRedisName); //Since we're making a new server, we create a new server object. Pass in the serverIP (e.g. '10.10.10.10:1234') and the given redis name (e.g. 'redis1')
servers.Add(newServer); //Add that new server to our list of servers
serverNames.Add(serverRedisName, newServer.serverIP); //Setting the server name to redisX (where X is an integer) and having it be associated with the IP address
}
/// <summary>
/// Used to remove a KetamaServer object from the collection of KetamaServer objects.
/// </summary>
/// <param name="serverIP">A server IP:port/weight value</param>
public void RemoveServerFromServers(string serverIP)
{
KetamaServer serverToRemove = GetKetamaServerByIP(serverIP);
servers.Remove(serverToRemove);
string serverName = GetServerNameFromIP(serverIP);
serverNames.Remove(serverName);
}
/// <summary>
/// Returns a KetamaServer object depending on the server IP:port/weight string passed ins
/// <param name="serverName">A server IP:port string (e.g. '10.10.10.10:6245') which should already
/// be stored in the List of serverInfo objects called servers</param>
/// <returns>A KetamaServer object from the servers list
/// If there's no serverInfo object found for that servername, passes back an empty KetamaServer object</returns>
public KetamaServer GetKetamaServerByIP(string serverIP)
{
foreach (KetamaServer server in servers)
{
if (server.serverIP == serverIP)
{
return server;
}
}
//If we get here, it means that the server wasn't found.
//We will return a new and empty KetamaServer object instead
KetamaServer newServer = new KetamaServer();
return newServer;
}
/// <summary>
/// Returns a KetamaServer object depending on the server IP:port/weight string passed ins
/// <param name="serverName">A server IP:port string (e.g. '10.10.10.10:6245') which should already
/// be stored in the List of serverInfo objects called servers</param>
/// <returns>A KetamaServer object from the servers list
/// If there's no serverInfo object found for that servername, passes back an empty KetamaServer object</returns>
public KetamaServer GetKetamaServerByIP(string serverIP)
{
foreach (KetamaServer server in servers)
{
if (server.serverIP == serverIP)
{
return(server);
}
}
//If we get here, it means that the server wasn't found.
//We will return a new and empty KetamaServer object instead
KetamaServer newServer = new KetamaServer();
return(newServer);
}
/// <summary>
/// Where the servers get their names hashed to be placed along the continuum.
/// How the hashing works: For the first hash, we calculate the hash with the server name (e.g. 'redis1') and the default offset value,
/// then for subsequent hashes we take the previous hash, use that hash value as the initial offset, and redo the hash.
/// In other words, for all but the first hash, when calculating a new hash value, the one that came before it is used as the salt.
/// </summary>
/// <param name="serverName">A server name to base hashes on</param>
/// <returns>A List(uint) of hashes for a given KetamaServer object</returns>
private List <uint> CalculateHashValuesForServer(string serverName)
{
KetamaServer server = ketamaServers.GetServer(serverName);
List <uint> listOfHashes = new List <uint>();
uint serverHostKeyHash;
for (int individualReplica = 0; individualReplica < server.factor; individualReplica++)
{
if (individualReplica == 0)
{
serverHostKeyHash = hashingAlgorithm.GetHashFromString(server.serverName);
}
else
{
serverHostKeyHash = hashingAlgorithm.GetHashFromString(server.serverName, listOfHashes.Last()); //using the last entry in the hash list as the offset for the next hash to come
}
listOfHashes.Add(serverHostKeyHash);
}
return(listOfHashes);
}
/// <summary>
/// Where the servers get their names hashed to be placed along the continuum.
/// How the hashing works: For the first hash, we calculate the hash with the server name (e.g. 'redis1') and the default offset value,
/// then for subsequent hashes we take the previous hash, use that hash value as the initial offset, and redo the hash.
/// In other words, for all but the first hash, when calculating a new hash value, the one that came before it is used as the salt.
/// </summary>
/// <param name="serverName">A KetamaServer object to get hashed for</param>
/// <returns>A List(uint) of hashes for a given KetamaServer object</returns>
private List <uint> CalculateHashValuesForServer(string serverName)
{
KetamaServer server = ketamaServers.GetKetamaServerByName(serverName);
List <uint> listOfHashes = new List <uint>();
uint serverHostKeyHash;
for (int individualReplica = 0; individualReplica < server.factor; individualReplica++)
{
if (individualReplica == 0)
{
serverHostKeyHash = hashingAlgorithm.GetHashFromString(server.serverIP);
}
else
{
serverHostKeyHash = hashingAlgorithm.GetHashFromString(server.serverIP, listOfHashes.Last()); //using the last entry in the hash list as the offset for the next hash to come
}
listOfHashes.Add(serverHostKeyHash); //Decide the best way to do this - whether they should be stored as uint's or uint's
}
return(listOfHashes);
}
/// <summary>
/// Used to remove a KetamaServer object from the collection of KetamaServer objects.
/// </summary>
/// <param name="server">A server name we want to remove</param>
public void RemoveServerFromServers(string server)
{
KetamaServer serverToRemove = GetServer(server);
servers.Remove(serverToRemove);
}
/// <summary>
/// Creating a new KetamaServer object based on the server IP:port/weight information passed in.
/// The new KetamaServer object will get saved to the list of KetamaServer objects called server
/// </summary>
/// <param name="serverName">The name of the server we're adding</param>
/// <param name="serverWeight">The weight of the server we're adding</param>
public void AddServerToServers(string serverName, int serverWeight = 0)
{
KetamaServer newServer = new KetamaServer(serverName, serverWeight); //Since we're making a new server, we create a new server object.
servers.Add(newServer); //Add that new server to our list of servers
}
/// <summary>
/// Creating a new KetamaServer object based on the server IP:port/weight information passed in.
/// The new KetamaServer object will get saved to the list of KetamaServer objects called server
/// </summary>
/// <param name="serverName">The name of the server we're adding</param>
/// <param name="serverWeight">The weight of the server we're adding</param>
public void AddServerToServers(string serverName, int serverWeight = 0)
{
KetamaServer newServer = new KetamaServer(serverName, serverWeight); //Since we're making a new server, we create a new server object.
servers.Add(newServer); //Add that new server to our list of servers
}