[rules-users] Analysing OutOfMemory, too many RightTuple

[bvoisin]

To help me understand what is happening in the WM, I've just made a analysis
method (see below), scrutating all the RightTuples from the WM facts and
showing some stats on the 5 biggest ones :

I call it every 100 matchFired and it shows me info like:

Biggest RightTuple types :
 - EvemetierData: RightTuple/NotNode[niveau == $niveau, suffixe == $suffixe]
x *209346*
 - SuffixeMapDHF: RightTuple/JoinNode[id == $ev.suffixe] x 17610
 - EvemetierData: RightTuple/AccumulateNode[this == $obj.father] x 14145
 - EvemetierData: RightTuple/AccumulateNode[niveau == $obj.niveau,
affperiode == $obj.affperiode, typeeve_id == $obj.typeeve_id, dteve ==
$obj.dteve, $suffixeMap.toPhaseTOT != null && ( $suffixeMap.toPhaseTOT !=
null && suffixe == $suffixeMap.toPhaseTOT.id )] x 14145
 - EvemetierData: RightTuple/NotNode[niveau == $niveau, suffixe == $suffixe,
sources contains $source3] x 11316

I clearly found my suspect N°1. Is there any pre-existing and better written
methods to do this kind of research in drools ?

Regards,
Benoît

Method to be called after each/N match fired or ... It uses Guava for the
collections :

      private void analyzeWorkingMemoryTuples()
        {
            Multiset<String> keys = HashMultiset.create();
            
            for(FactHandle handle:kieSession.getFactHandles())
            {
                DefaultFactHandle factHandle = (DefaultFactHandle)handle;
                String
factType=factHandle.getObject().getClass().getSimpleName();
                
                RightTuple rightTuple = factHandle.getFirstRightTuple();
                while(rightTuple!=null)
                {
                    String key = factType + ": RightTuple";
                    BetaNode sink =
(BetaNode)rightTuple.getRightTupleSink();
                    if (sink!=null) {
                        key+= "/" + sink.getClass().getSimpleName();
                        key+=Arrays.toString(sink.getConstraints());
                    }
                    keys.add(key);
                    rightTuple = rightTuple.getHandleNext();
                }
            }
            
            ArrayList<Multiset.Entry&lt;String>> entries =
Lists.newArrayList(keys.entrySet());
            Collections.sort(entries, new
Comparator<Multiset.Entry&lt;String>>(){
                @Override
                public int compare(Entry<String> o1, Entry<String> o2)
                {
                    return -Integer.compare(o1.getCount(), o2.getCount());
                }
            });
            String analysis = Joiner.on("\n -
").join(Iterables.limit(entries, 5));
            if (!analysis.equals(previousAnalysis)) 
            {
                logger.info("Biggest RightTuple types :\n - " + analysis);                
                previousAnalysis = analysis;
            }
        }




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