public ISet <MultiKey <EventBean> > StaticJoin()
{
var result = new LinkedHashSet <MultiKey <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 DataCacheClearableMap[_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)
{
var streamEvents = historicalViewable.GetEnumerator();
for (; streamEvents.MoveNext();)
{
lookupEvents[0] = streamEvents.Current;
_queryStrategies[stream].Lookup(lookupEvents, result, _staticEvalExprEvaluatorContext);
}
}
}
else
{
var streamEvents = _streamViews[stream].GetEnumerator();
for (; streamEvents.MoveNext();)
{
lookupEvents[0] = streamEvents.Current;
_queryStrategies[stream].Lookup(lookupEvents, result, _staticEvalExprEvaluatorContext);
}
}
}
}
finally
{
DeassignThreadLocalCache(_streamViews, caches);
}
return(result);
}
private void AssignThreadLocalCache(Viewable[] streamViews, DataCacheClearableMap[] caches)
{
for (var stream = 0; stream < streamViews.Length; stream++)
{
if (streamViews[stream] is HistoricalEventViewable)
{
var historicalViewable = (HistoricalEventViewable)streamViews[stream];
caches[stream] = new DataCacheClearableMap();
historicalViewable.DataCacheThreadLocal.Value = caches[stream];
}
}
}
