/// <summary>
/// add worker to table and ping to keep alive
/// </summary>
protected virtual async Task PingWorker(string activityId, IWorkerInfo worker)
{
// if ping was unsuccessful, keep pinging. this is to address
// the issue where site continue to run on an unassigned worker.
if (!_pingResult || _pingWorkerUtc < DateTime.UtcNow)
{
// if PingWorker throws, we will not update the worker status
// this worker will be stale and eventually removed.
_pingResult = await _eventHandler.PingWorker(activityId, worker);
_pingWorkerUtc = DateTime.UtcNow.Add(_settings.WorkerPingInterval);
}
// check if worker is valid for the site
if (_pingResult)
{
await _table.AddOrUpdate(worker);
_tracer.TraceUpdateWorker(activityId, worker, string.Format("Worker loadfactor {0} updated", worker.LoadFactor));
}
else
{
_tracer.TraceWarning(activityId, worker, string.Format("Worker does not belong to the site."));
await _table.Delete(worker);
_tracer.TraceRemoveWorker(activityId, worker, "Worker removed");
throw new InvalidOperationException("The worker does not belong to the site.");
}
}
private async Task DeleteAllWorkers(IWorkerTable table)
{
var workers = await table.List();
foreach (var worker in workers)
{
await table.Delete(worker);
}
}
