private WeightedWorkScheduler()
{
_newWork = new ConcurrentQueue <WorkItem>();
_newWorkEvent = new AutoResetEvent(false);
var work = new List <WorkQueue>();
var queueManager = new Thread(() =>
{
var workersCount = Configuration.Config.GetInt("data-feed-workers-count", Environment.ProcessorCount);
MaxWorkWeight = Configuration.Config.GetInt("data-feed-max-work-weight", 400);
Logging.Log.Trace($"WeightedWorkScheduler(): will use {workersCount} workers and MaxWorkWeight is {MaxWorkWeight}");
for (var i = 0; i < workersCount; i++)
{
var workQueue = new WorkQueue();
work.Add(workQueue);
var thread = new Thread(() => WorkerThread(workQueue, _newWork, _newWorkEvent))
{
IsBackground = true,
Priority = ThreadPriority.Lowest,
Name = $"WeightedWorkThread{i}"
};
thread.Start();
}
// make sure that the WorkQueue are kept sorted and the weights up to date
while (true)
{
Thread.Sleep(TimeSpan.FromMilliseconds(1));
foreach (var queue in work)
{
queue.Sort();
}
}
})
{
IsBackground = true,
Name = "WeightedWorkManager"
};
queueManager.Start();
}
/// <summary>
/// This is the worker thread loop.
/// It will first try to take a work item from the new work queue else will check his own queue.
/// </summary>
private static void WorkerThread(WorkQueue workQueue, ConcurrentQueue <WorkItem> newWork, AutoResetEvent newWorkEvent)
{
var waitHandles = new WaitHandle[] { workQueue.WorkAvailableEvent, newWorkEvent };
while (true)
{
WorkItem workItem;
if (!newWork.TryDequeue(out workItem))
{
workItem = workQueue.Get();
if (workItem == null)
{
// no work to do, lets sleep and try again
WaitHandle.WaitAny(waitHandles, 100);
continue;
}
}
else
{
workQueue.Add(workItem);
}
try
{
if (!workItem.Work(WorkBatchSize))
{
workQueue.Remove(workItem);
}
}
catch (Exception exception)
{
workQueue.Remove(workItem);
Logging.Log.Error(exception);
}
}
}