/// <summary>
/// Worker to query one aggregate of a topology
/// </summary>
/// <param name="aggregateIndex">The aggregation view to update by the worker</param>
/// <param name="token">CancellationToken</param>
public async Task Worker(int aggregateIndex, CancellationToken token)
{
RDXOpcUaQueries opcUaQueries = new RDXOpcUaQueries(token);
RDXOeeKpiQueries oeeKpiQueries = new RDXOeeKpiQueries(opcUaQueries, token);
RDXTrace.TraceInformation("RDX Worker {0} started", aggregateIndex);
// give app some time to start before updating queries
await Task.Delay(10000 *(aggregateIndex + 1));
while (!token.IsCancellationRequested)
{
Stopwatch stopWatch = new Stopwatch();
DateTime nextUpdate = DateTime.MaxValue;
bool resetStartDelayed = false;
stopWatch.Start();
Interlocked.Increment(ref _busyWorkers);
// the station and node list is updated, other workers are delayed
while (_workerStartDelayed != 0)
{
RDXTrace.TraceInformation("RDX Worker {0} delayed", aggregateIndex);
await Task.Delay(1000);
}
try
{
List <Task> tasks = new List <Task>();
ContosoTopologyNode rootNode = _topology.GetRootNode();
ContosoAggregatedOeeKpiHistogram aggregatedTimeSpan = rootNode[aggregateIndex];
DateTimeRange searchSpan = RDXUtils.TotalSearchRangeFromNow(aggregatedTimeSpan);
RDXTrace.TraceInformation("RDX Worker {0} updating Range {1} to {2}",
aggregateIndex, searchSpan.From, searchSpan.To);
// calc next update. To time is already rounded for update time span.
nextUpdate = searchSpan.To + rootNode[aggregateIndex].UpdateTimeSpan;
// query all stations in topology and find all active servers in timespan
Task <StringDimensionResult> aggServerTask = opcUaQueries.AggregateServers(searchSpan);
// always get an aggregate of all activity for the latest interval, use it as a cache
TimeSpan intervalTimeSpan = aggregatedTimeSpan[0].IntervalTimeSpan;
DateTimeRange aggregateSpan = RDXUtils.CalcAggregationRange(aggregatedTimeSpan, searchSpan.To);
RDXCachedAggregatedQuery fullQuery = new RDXCachedAggregatedQuery(opcUaQueries);
Task aggServerAndNodesTask = fullQuery.Execute(aggregateSpan);
// wait for all outstanding aggregates
tasks.Add(aggServerTask);
tasks.Add(aggServerAndNodesTask);
await RDXUtils.WhenAllTasks("Aggregates", tasks, stopWatch);
List <string> topologyStations = _topology.GetAllChildren(_tree.TopologyRoot.Key, typeof(Station));
List <string> opcUaServers = await aggServerTask;
// intersect list of active servers and schedule all queries
tasks.Clear();
List <string> opcUaServersToQuery = opcUaServers.Intersect(topologyStations, StringComparer.InvariantCultureIgnoreCase).ToList();
await oeeKpiQueries.ScheduleAllOeeKpiQueries(searchSpan, _topology, fullQuery, opcUaServersToQuery, tasks, aggregateIndex);
// wait for all outstanding queries
await RDXUtils.WhenAllTasks("Queries", tasks, stopWatch);
// Update the topology Oee and KPI values
_topology.UpdateAllKPIAndOEEValues(aggregateIndex);
// one worker issues the Browser update
if (aggregatedTimeSpan.UpdateBrowser)
{
// Push updates to dashboard
BrowserUpdate();
RDXTrace.TraceInformation("BrowserUpdate finished after {0}ms",
stopWatch.ElapsedMilliseconds);
}
// add new stations and nodes to topology
if (aggregatedTimeSpan.UpdateTopology)
{
// delay other workers
Interlocked.Exchange(ref _workerStartDelayed, 1);
resetStartDelayed = true;
// only add stations and nodes if no other worker is busy yet
if (Interlocked.Increment(ref _busyWorkers) == 2)
{
AddNewServers(fullQuery, topologyStations);
await AddNewNodes(fullQuery, topologyStations);
RDXTrace.TraceInformation("Add New Server and Nodes finished after {0}ms",
stopWatch.ElapsedMilliseconds);
}
}
}
catch (Exception e)
{
RDXTrace.TraceError("Exception {0} in Worker after {1}ms",
e.Message, stopWatch.ElapsedMilliseconds);
}
finally
{
Interlocked.Decrement(ref _busyWorkers);
if (resetStartDelayed)
{
Interlocked.Decrement(ref _busyWorkers);
Interlocked.Exchange(ref _workerStartDelayed, 0);
}
}
RDXTrace.TraceInformation("RDX Worker {0} schedule next update for {1}",
aggregateIndex, nextUpdate);
TimeSpan delay = nextUpdate.Subtract(DateTime.UtcNow);
if (delay.TotalMilliseconds > 0)
{
await Task.Delay(delay, token);
}
}
}
