public Server Choose(ILoadBalancer loadBalancer)
{
var count = 0;
while (count++ < 10)
{
var servers = loadBalancer.ReachableServers();
var serversCount = servers?.Count ?? 0;
if (serversCount == 0)
{
return(null);
}
var server = servers[GetModulo(serversCount)];
if (server == null)
{
Thread.Sleep(5 * 1000);
continue;
}
if (server.IsAlive && server.ReadyToServe)
{
return(server);
}
}
return(null);
}
public Server Choose(ILoadBalancer loadBalancer)
{
Server server = null;
while (true)
{
var currentWeights = _accumulater.AccumulatedWeights;
var servers = loadBalancer.ReachableServers();
var serversCount = servers?.Count ?? 0;
if (serversCount == 0)
{
return(null);
}
var length = currentWeights?.Length ?? 0;
var maxTotalWeight = length == 0 ? 0 : currentWeights[length - 1];
if (maxTotalWeight < 0.001)
{
server = RibonRule.Choose(loadBalancer);
if (server != null)
{
return(server);
}
}
else
{
var randomWeight = Random.NextDouble() * maxTotalWeight;
for (var i = 0; i < length; i++)
{
var weight = currentWeights[i];
if (!(weight > randomWeight))
{
continue;
}
server = servers[i];
break;
}
}
if (server == null)
{
Thread.Sleep(5 * 1000);
continue;
}
if (server.IsAlive)
{
return(server);
}
server = null;
}
}
public Server Choose(ILoadBalancer loadBalancer)
{
while (true)
{
var servers = loadBalancer.ReachableServers();
var serversCount = servers?.Count ?? 0;
if (serversCount == 0)
{
return(null);
}
var server = servers[Random.Next(0, serversCount)];
if (server == null)
{
Thread.Sleep(5 * 1000);
continue;
}
if (server.IsAlive && server.ReadyToServe)
{
return(server);
}
}
}
public Server Choose(ILoadBalancer loadBalancer)
{
while (true)
{
if (_collector == null)
{
return(RibonRule.Choose(loadBalancer));
}
var minimalActiveRequestsCount = long.MaxValue;
var now = DateTime.Now;
Server chosen = null;
var servers = loadBalancer.ReachableServers();
if (servers == null)
{
Thread.Sleep(5 * 1000);
continue;
}
var statuses = (from s in servers let status = _collector.ServerStatus(s) where !status.IsCircuitBreakerTripped(now) select status).ToArray();
foreach (var status in statuses)
{
var activeRequestsCount = status.ActiveRequestsCount;
if (activeRequestsCount > minimalActiveRequestsCount)
{
continue;
}
minimalActiveRequestsCount = activeRequestsCount;
}
if (minimalActiveRequestsCount == long.MaxValue)
{
return(null);
}
var count = statuses.Count(x => x.ActiveRequestsCount == minimalActiveRequestsCount);
chosen = count > 1 ? statuses[Random.Next(0, statuses.Length)].Server : statuses[0].Server;
return(chosen);
}
}
