private void AssignThreadLocalCache(
Viewable[] streamViews,
HistoricalDataCacheClearableMap[] caches)
{
for (var stream = 0; stream < streamViews.Length; stream++) {
if (streamViews[stream] is HistoricalEventViewable) {
var historicalViewable = (HistoricalEventViewable) streamViews[stream];
caches[stream] = new HistoricalDataCacheClearableMap();
historicalViewable.DataCacheThreadLocal.Value = caches[stream];
}
}
}
public ISet<MultiKeyArrayOfKeys<EventBean>> StaticJoin()
{
ISet<MultiKeyArrayOfKeys<EventBean>> result = new LinkedHashSet<MultiKeyArrayOfKeys<EventBean>>();
var lookupEvents = new EventBean[1];
// Assign a local cache for the thread's evaluation of the join
// This ensures that if a SQL/method generates a row for a result set based on an input parameter, the event instance is the same
// in the join, and thus the same row does not appear twice.
var caches = new HistoricalDataCacheClearableMap[QueryStrategies.Length];
AssignThreadLocalCache(streamViews, caches);
// perform join
try {
// for each stream, perform query strategy
for (var stream = 0; stream < QueryStrategies.Length; stream++) {
if (streamViews[stream] is HistoricalEventViewable) {
var historicalViewable = (HistoricalEventViewable) streamViews[stream];
if (historicalViewable.HasRequiredStreams) {
continue;
}
// there may not be a query strategy since only a full outer join may need to consider all rows
if (QueryStrategies[stream] != null) {
IEnumerator<EventBean> streamEvents = historicalViewable.GetEnumerator();
for (; streamEvents.MoveNext();) {
lookupEvents[0] = streamEvents.Current;
QueryStrategies[stream].Lookup(lookupEvents, result, staticEvalExprEvaluatorContext);
}
}
}
else {
IEnumerator<EventBean> streamEvents = streamViews[stream].GetEnumerator();
for (; streamEvents.MoveNext();) {
lookupEvents[0] = streamEvents.Current;
QueryStrategies[stream].Lookup(lookupEvents, result, staticEvalExprEvaluatorContext);
}
}
}
}
finally {
DeassignThreadLocalCache(streamViews, caches);
}
return result;
}