public override async Task <string> ProcessRequestAsync(string query, TimeSpan timeout)
{
var replica = ReplicaAddresses.ToList();
var priorityReplica = replica
.Select((t, i) => new Tuple <int, string>(Priority[i], t))
.ToList();
priorityReplica.Sort();
var timeoutOneTask = new TimeSpan(timeout.Ticks / ReplicaAddresses.Length);
for (var i = 0; i < priorityReplica.Count; i++)
{
var priorityReplicaAddress = priorityReplica[i];
var replicaAddress = priorityReplicaAddress.Item2;
var webRequest = CreateRequest(replicaAddress + "?query=" + query);
Log.InfoFormat("Processing {0}", webRequest.RequestUri);
var resultTask = ProcessRequestAsync(webRequest);
await Task.WhenAny(resultTask, Task.Delay(timeoutOneTask));
if (!resultTask.IsCompleted || resultTask.IsFaulted)
{
Priority[i] += 1;
continue;
}
Priority[i] -= 1;
return(resultTask.Result);
}
throw new TimeoutException();
}
public IEnumerable <string> RandomizeReplicas()
{
var replicasToList = ReplicaAddresses.ToList();
while (replicasToList.Count > 0)
{
var uri = replicasToList[new Random().Next(replicasToList.Count)];
replicasToList.Remove(uri);
yield return(uri);
}
}