private Tuple <BrokerGroup, NewQmqClient> SelectWritableClient()
{
var cluster = _isDelayMessage ? _brokerGroupService.DelayProducerGetSubjectCluster(_subject) : _brokerGroupService.ProducerGetSubjectCluster(_subject);
if (cluster.BrokerGroups.Count == 0)
{
return(null);
}
var brokerGroups = DictValueFilter.Filter(cluster.BrokerGroups, BrokerGroup.IsWritable);
if (brokerGroups.Count == 0)
{
return(null);
}
// First of all, random select a client.
// If random selected client is not writable, then select first writable client.
var randBrokerGroup = brokerGroups.ElementAt(StaticRandom.NextRand(brokerGroups.Count));
var randClient = ClientManager.GetOrCreate(randBrokerGroup);
if (randClient.Writtable)
{
return(new Tuple <BrokerGroup, NewQmqClient>(randBrokerGroup, randClient));
}
var client = brokerGroups.Select(brokerGroup => new Tuple <BrokerGroup, NewQmqClient>(brokerGroup, ClientManager.GetOrCreate(brokerGroup)))
.FirstOrDefault(tuple => tuple.Item2.Writtable);
return(client);
}
public BrokerGroup Select(NewQmqClusterInfo cluster)
{
if (cluster.BrokerGroups.Count == 0)
{
return(null);
}
var groups = DictValueFilter.Filter(cluster.BrokerGroups, BrokerGroup.IsReadable);
if (groups == null || groups.Count == 0)
{
return(null);
}
var totalWeight = 0;
var sameWeight = true;
var lastWeight = -1;
foreach (var group in groups)
{
if (!weights.TryGetValue(group.Name, out int weight))
{
weights.TryAdd(group.Name, DEFAULT_WEIGHT);
weight = DEFAULT_WEIGHT;
}
if (lastWeight != -1 && lastWeight != weight)
{
sameWeight = false;
}
lastWeight = weight;
totalWeight += weight;
}
if (totalWeight == 0)
{
return(null);
}
if (totalWeight > 0 && !sameWeight)
{
int offset = StaticRandom.NextRand(totalWeight);
foreach (var group in groups)
{
weights.TryGetValue(group.Name, out int weight);
offset -= weight;
if (offset <= 0)
{
return(group);
}
}
}
var index = StaticRandom.NextRand(groups.Count);
return(groups[index]);
}
public BrokerGroup Select(NewQmqClusterInfo cluster)
{
if (cluster.BrokerGroups.Count == 0)
{
return(null);
}
var groups = DictValueFilter.Filter(cluster.BrokerGroups, BrokerGroup.IsReadable);
if (groups == null || groups.Count == 0)
{
return(null);
}
var count = groups.Count;
return(groups[Math.Abs(Interlocked.Increment(ref index) % count)]);
}