public static FairCallQueue.MetricsProxy GetInstance(string @namespace)
{
lock (typeof(MetricsProxy))
{
FairCallQueue.MetricsProxy mp = Instances[@namespace];
if (mp == null)
{
// We must create one
mp = new FairCallQueue.MetricsProxy(@namespace);
Instances[@namespace] = mp;
}
return(mp);
}
}
/// <summary>Create a FairCallQueue.</summary>
/// <param name="capacity">the maximum size of each sub-queue</param>
/// <param name="ns">the prefix to use for configuration</param>
/// <param name="conf">
/// the configuration to read from
/// Notes: the FairCallQueue has no fixed capacity. Rather, it has a minimum
/// capacity of `capacity` and a maximum capacity of `capacity * number_queues`
/// </param>
public FairCallQueue(int capacity, string ns, Configuration conf)
{
/* Scheduler picks which queue to place in */
/* Multiplexer picks which queue to draw from */
/* Statistic tracking */
int numQueues = ParseNumQueues(ns, conf);
Log.Info("FairCallQueue is in use with " + numQueues + " queues.");
this.queues = new AList <BlockingQueue <E> >(numQueues);
this.overflowedCalls = new AList <AtomicLong>(numQueues);
for (int i = 0; i < numQueues; i++)
{
this.queues.AddItem(new LinkedBlockingQueue <E>(capacity));
this.overflowedCalls.AddItem(new AtomicLong(0));
}
this.scheduler = new DecayRpcScheduler(numQueues, ns, conf);
this.multiplexer = new WeightedRoundRobinMultiplexer(numQueues, ns, conf);
// Make this the active source of metrics
FairCallQueue.MetricsProxy mp = FairCallQueue.MetricsProxy.GetInstance(ns);
mp.SetDelegate(this);
}
