public TaskIndexRecord FormatIndexRecord([NotNull] TaskMetaInformation taskMeta)
{
var taskTopic = taskDataRegistry.GetTaskTopic(taskMeta.Name);
var taskIndexShardKey = new TaskIndexShardKey(taskTopic, taskMeta.State);
return(new TaskIndexRecord(taskMeta.Id, taskMeta.MinimalStartTicks, taskIndexShardKey));
}
public IEnumerable <TaskIndexRecord> GetRecords([NotNull] TaskIndexShardKey taskIndexShardKey, long toTicks, int batchSize)
{
var fromTicks = TryGetFromTicks(taskIndexShardKey, out var liveRecordTicksMarker);
if (!fromTicks.HasValue)
{
return(new TaskIndexRecord[0]);
}
return(new GetEventsEnumerable(liveRecordTicksMarker, serializer, RetrieveColumnFamilyConnection(), fromTicks.Value, toTicks, batchSize, logger));
}
private ILiveRecordTicksMarker DoTryGetCurrentMarkerValue([NotNull] TaskIndexShardKey taskIndexShardKey)
{
lock (locker)
{
long currentTicks;
if (!ticksByShardKey.TryGetValue(taskIndexShardKey, out currentTicks))
{
return(null);
}
return(new LiveRecordTicksMarker(new LiveRecordTicksMarkerState(taskIndexShardKey, currentTicks), this));
}
}
private TimeSpan GetOverlapDuration([NotNull] TaskIndexShardKey taskIndexShardKey)
{
lock (locker)
{
var now = Timestamp.Now;
if (!lastBigOverlapMomentsByShardKey.TryGetValue(taskIndexShardKey, out var lastBigOverlapMoment) || now - lastBigOverlapMoment > TimeSpan.FromMinutes(1))
{
lastBigOverlapMomentsByShardKey[taskIndexShardKey] = now;
//Сложно рассчитать математически правильный размер отката, и код постановки таски может измениться,
//что потребует изменения этого отката. Поэтому берется, как кажется, с запасом
return(TimeSpan.FromMinutes(8)); // Против адских затупов кассандры
}
return(TimeSpan.FromMinutes(1)); // Штатная зона нестабильности
}
}
public ILiveRecordTicksMarker TryGetCurrentMarkerValue([NotNull] TaskIndexShardKey taskIndexShardKey)
{
var currentMarkerValue = DoTryGetCurrentMarkerValue(taskIndexShardKey);
if (currentMarkerValue != null)
{
return(currentMarkerValue);
}
var persistedTicks = minTicksHolder.GetMinTicks(taskIndexShardKey.ToCassandraKey());
if (persistedTicks == 0)
{
return(null);
}
return(DoGetCurrentMarkerValue(taskIndexShardKey, persistedTicks));
}
public bool TryMoveForward([NotNull] TaskIndexShardKey taskIndexShardKey, long oldTicks, long newTicks)
{
lock (locker)
{
long currentTicks;
if (!ticksByShardKey.TryGetValue(taskIndexShardKey, out currentTicks))
{
throw new InvalidOperationException(string.Format("Not found CurrentTicks for: {0}", taskIndexShardKey));
}
if (currentTicks < oldTicks)
{
return(false);
}
ticksByShardKey[taskIndexShardKey] = newTicks;
return(true);
}
}
private long?TryGetFromTicks([NotNull] TaskIndexShardKey taskIndexShardKey, out ILiveRecordTicksMarker liveRecordTicksMarker)
{
liveRecordTicksMarker = oldestLiveRecordTicksHolder.TryGetCurrentMarkerValue(taskIndexShardKey);
if (liveRecordTicksMarker == null)
{
return(null);
}
var overlapDuration = GetOverlapDuration(taskIndexShardKey);
var fromTicks = liveRecordTicksMarker.State.CurrentTicks - overlapDuration.Ticks;
var safetyBelt = (Timestamp.Now - TimeSpan.FromHours(6)).Ticks;
if (fromTicks < safetyBelt)
{
logger.Warn("fromTicks ({FromTicks}) < safetyBelt ({SafetyBelt})", new { FromTicks = new Timestamp(fromTicks), SafetyBelt = new Timestamp(safetyBelt) });
return(safetyBelt);
}
return(fromTicks);
}
private void DoMoveBackwardIfNecessary([NotNull] TaskIndexShardKey taskIndexShardKey, long newTicks)
{
lock (locker)
{
long currentTicks;
if (!ticksByShardKey.TryGetValue(taskIndexShardKey, out currentTicks))
{
ticksByShardKey.Add(taskIndexShardKey, newTicks);
}
else
{
if (newTicks < currentTicks)
{
ticksByShardKey[taskIndexShardKey] = newTicks;
}
}
}
}
private ILiveRecordTicksMarker DoGetCurrentMarkerValue([NotNull] TaskIndexShardKey taskIndexShardKey, long persistedTicks)
{
lock (locker)
{
long currentTicks;
if (!ticksByShardKey.TryGetValue(taskIndexShardKey, out currentTicks))
{
currentTicks = persistedTicks;
ticksByShardKey.Add(taskIndexShardKey, currentTicks);
}
else
{
if (persistedTicks < currentTicks)
{
currentTicks = persistedTicks;
ticksByShardKey[taskIndexShardKey] = currentTicks;
}
}
return(new LiveRecordTicksMarker(new LiveRecordTicksMarkerState(taskIndexShardKey, currentTicks), this));
}
}
public LiveRecordTicksMarkerState TryGetCurrentLiveRecordTicksMarker([NotNull] TaskIndexShardKey taskIndexShardKey)
{
return(minimalStartTicksIndex.TryGetCurrentLiveRecordTicksMarker(taskIndexShardKey));
}
public static string ToCassandraKey([NotNull] this TaskIndexShardKey taskIndexShardKey)
{
var taskStateCassandraName = taskIndexShardKey.TaskState.GetCassandraName();
return(string.Format("{0}_{1}", taskIndexShardKey.TaskTopic, taskStateCassandraName));
}
public static string GetRowKey([NotNull] TaskIndexShardKey taskIndexShardKey, long ticks)
{
return(string.Format("{0}_{1}", GetTicksRowNumber(ticks), taskIndexShardKey.ToCassandraKey()));
}
public LiveRecordTicksMarkerState TryGetCurrentLiveRecordTicksMarker([NotNull] TaskIndexShardKey taskIndexShardKey)
{
return(oldestLiveRecordTicksHolder.TryGetCurrentMarkerValue(taskIndexShardKey)?.State);
}
public LiveRecordTicksMarkerState([NotNull] TaskIndexShardKey taskIndexShardKey, long currentTicks)
{
TaskIndexShardKey = taskIndexShardKey;
CurrentTicks = currentTicks;
}
public void MoveMarkerBackwardIfNecessary([NotNull] TaskIndexShardKey taskIndexShardKey, long newTicks)
{
minTicksHolder.UpdateMinTicks(taskIndexShardKey.ToCassandraKey(), newTicks);
DoMoveBackwardIfNecessary(taskIndexShardKey, newTicks);
}
