/// <summary>
/// Gets a connection to a random member.
/// </summary>
/// <returns>A random client connection if available; otherwise <c>null</c>.</returns>
public MemberConnection GetRandomConnection()
{
MemberConnection connection;
// In "smart routing" mode the clients connect to each member of the cluster. Since each
// data partition uses the well known and consistent hashing algorithm, each client
// can send an operation to the relevant cluster member, which increases the
// overall throughput and efficiency. Smart mode is the default mode.
//
// In "uni-socket" mode the clients is required to connect to a single member, which
// then behaves as a gateway for the other members. Firewalls, security, or some
// custom networking issues can be the reason for these cases.
if (_clusterState.IsSmartRouting)
{
// "smart" mode
// limit the number of tries to the amount of known members
var count = _loadBalancer.Count;
for (var i = 0; i < count; i++)
{
var memberId = _loadBalancer.GetMember();
lock (Mutex)
{
if (_connections.TryGetValue(memberId, out connection))
{
return(connection);
}
}
}
}
// either "smart" mode but the load balancer did not return a member,
// or "uni-socket" mode where there should only be once connection
lock (Mutex) connection = _connections.Values.FirstOrDefault();
// may be null
return(connection);
}