/// <summary>
/// Recursive method to run through all child nodes and, for each result set tuple returned
/// by a child node, execute the inner child of the child node until there are no inner child nodes.
/// </summary>
/// <param name="lookupEvent">current event to use for lookup by child node</param>
/// <param name="nestingOrderIndex">index within the child nodes indicating what nesting level we are at</param>
/// <param name="currentPath">prototype result row to use by child nodes for generating result rows</param>
/// <param name="result">result tuple rows to be populated</param>
/// <param name="exprEvaluatorContext">context for expression evalauation</param>
protected void RecursiveNestedJoin(
EventBean lookupEvent,
int nestingOrderIndex,
EventBean[] currentPath,
ICollection<EventBean[]> result,
ExprEvaluatorContext exprEvaluatorContext)
{
IList<EventBean[]> nestedResult = new List<EventBean[]>();
ExecNode nestedExecNode = childNodes[nestingOrderIndex];
nestedExecNode.Process(lookupEvent, currentPath, nestedResult, exprEvaluatorContext);
bool isLastStream = nestingOrderIndex == nestingOrderLength - 1;
// This is not the last nesting level so no result rows are added. Invoke next nesting level for
// each event found.
if (!isLastStream) {
foreach (EventBean[] row in nestedResult) {
EventBean lookup = row[nestedStreams[nestingOrderIndex]];
RecursiveNestedJoin(lookup, nestingOrderIndex + 1, row, result, exprEvaluatorContext);
}
return;
}
// Loop to add result rows
foreach (EventBean[] row in nestedResult) {
result.Add(row);
}
}
public void Lookup(EventBean[] lookupEvents, ICollection <MultiKey <EventBean> > joinSet, ExprEvaluatorContext exprEvaluatorContext)
{
if ((lookupEvents != null) && (lookupEvents.Length != 0))
{
unchecked
{
var results = new List <EventBean[]>();
int count = lookupEvents.Length;
for (int ii = 0; ii < count; ii++)
{
var theEvent = lookupEvents[ii];
var prototype = new EventBean[NumStreams];
// Set up _prototype row
prototype[ForStream] = theEvent;
// Perform execution
ExecNode.Process(theEvent, prototype, results, exprEvaluatorContext);
// Convert results into unique set
results.ForEach(row => joinSet.Add(new MultiKey <EventBean>(row)));
results.Clear();
}
}
}
}