private TResult Balance <TResult>(Func <ISolrOperations <T>, TResult> operation, bool leader = false)
{
var attempt = 0;
while (attempt++ < maxAttempts)
{
var replica = clusterBalancer.Balance(usableReplicas, leader);
if (replica == null)
{
throw new ApplicationException("No appropriate replica was selected to perform the operation.");
}
Debug.WriteLine("using replica " + replica.Name);
var operations = operationsProvider.GetOperations <T>(replica.Url);
if (operations == null)
{
throw new ApplicationException("Operation provider returned null.");
}
try {
return(operation(operations));
} catch (Exception exception) {
// todo: possibly deactivate zombie node when status is not 401, 500
exceptionHandlers.Handle(exception);
}
}
throw new ApplicationException("Atempts limit was depleted.");
}
private bool Update()
{
try {
if (zooKeeper == null)
{
zooKeeper = new ZooKeeper(zooKeeperConnection, TimeSpan.FromSeconds(10), this);
}
Collections = SolrClusterStateParser.ParseJsonToCollections(
Encoding.Default.GetString(
zooKeeper.GetData("/clusterstate.json", true, null)));
return(true);
} catch (Exception exception) {
exceptionHandlers.Handle(exception);
}
return(false);
}
