async Task UpdateServingNodes(IPEndPoint from, IPEndPoint servingNodeEndpoint)
{
var existingServingNodeEndPoints =
from node in _servingNodes.GetControllers()
where node.ServingEndPoint != servingNodeEndpoint
select node.ServingEndPoint;
//inform that serving node of all existing serving nodes
await TaskCordinator.Retry(() => _loadBalancerProtocol.SendServingNodes(existingServingNodeEndPoints, from));
//inform existing serving nodes of the new node
var existingControlNodeEndPoints =
from node in _servingNodes.GetControllers()
where node.ServingEndPoint != servingNodeEndpoint
select node.ControlEndPoint;
var existingCallControllers =
from controller in _callControllers.Controllers
select controller.LoadBalancerEndPoint;
foreach (var endPoint in existingControlNodeEndPoints.Concat(existingCallControllers))
{
TaskCordinator.DontWait(() => TaskCordinator.Retry(() => _loadBalancerProtocol.SendServingNodes(new IPEndPoint[] { servingNodeEndpoint }, endPoint)));
}
await InformServingNodeOfGroupCallControllers(from);
}
async Task RemoveExpiredControllers()
{
while (!_closing)
{
await Task.Delay(5000); //todo: find the time till the next controller expires and wait that long
_servingNodes.RemoveExpired(removedNode =>
{
var servingNodeEndpoint = removedNode.ServingEndPoint;
var existingServingNodeEndPoints =
from node in _servingNodes.GetControllers()
select node.ControlEndPoint;
var callContollerEndPoints =
from node in _callControllers.Controllers
select node.LoadBalancerEndPoint;
foreach (var endPoint in existingServingNodeEndPoints.Concat(callContollerEndPoints))
{
Console.WriteLine($"Sending ServingNodeRemoved to {endPoint}");
TaskCordinator.DontWait(() => TaskCordinator.Retry(() => _loadBalancerProtocol.SendServingNodeRemoved(servingNodeEndpoint, endPoint)));
}
});
_callControllers.RemoveExpired();
}
}