@Override
public boolean isRemove(
FlowProcess flowProcess, FilterCall<LinkedHashMap<Tuple, Object>> filterCall) {
// we assume its more painful to create lots of tuple copies vs comparisons
Tuple args = TupleHasher.wrapTuple(tupleHasher, filterCall.getArguments().getTuple());
switch (include) {
case ALL:
break;
case NO_NULLS:
if (Tuples.frequency(args, null) == args.size()) return true;
break;
}
if (filterCall.getContext().containsKey(args)) {
flowProcess.increment(Cache.Num_Keys_Hit, 1);
return true;
}
// only do the copy here
filterCall
.getContext()
.put(TupleHasher.wrapTuple(tupleHasher, filterCall.getArguments().getTupleCopy()), null);
flowProcess.increment(Cache.Num_Keys_Missed, 1);
return false;
}
/**
* Constructor Unique creates a new Unique instance.
*
* @param name of type String
* @param pipes of type Pipe[]
* @param uniqueFields of type Fields
* @param threshold of type int
*/
@ConstructorProperties({"name", "pipes", "uniqueFields", "include", "threshold"})
public Unique(String name, Pipe[] pipes, Fields uniqueFields, Include include, int threshold) {
super(pipes);
if (uniqueFields == null) throw new IllegalArgumentException("uniqueFields may not be null");
Pipe[] filters = new Pipe[pipes.length];
TupleHasher tupleHasher = null;
Comparator[] comparators = uniqueFields.getComparators();
if (!TupleHasher.isNull(comparators)) tupleHasher = new TupleHasher(null, comparators);
FilterPartialDuplicates partialDuplicates =
new FilterPartialDuplicates(include, threshold, tupleHasher);
for (int i = 0; i < filters.length; i++)
filters[i] = new Each(pipes[i], uniqueFields, partialDuplicates);
Pipe pipe = new GroupBy(name, filters, uniqueFields);
pipe = new Every(pipe, Fields.ALL, new FirstNBuffer(), Fields.RESULTS);
setTails(pipe);
}