| 1 | package com.hammurapi.eventbus; |
| 2 | |
| 3 | import java.util.logging.Logger; |
| 4 | |
| 5 | /** |
| 6 | * Discards events with length of inference chain greater than specified threshold, issues warning. |
| 7 | * @author Pavel Vlasov |
| 8 | */ |
| 9 | public class InferenceChainLengthFilter<E, P extends Comparable<P>, C, K, H extends EventBus.Handle<E,P,C>, S extends EventStore<E,P,C,H,S>> implements InferenceFilter<E,P,C,K,H,S> { |
| 10 | |
| 11 | private static final Logger logger = Logger.getLogger(InferenceChainLengthFilter.class.getCanonicalName()); |
| 12 | |
| 13 | private int threshold; |
| 14 | |
| 15 | public InferenceChainLengthFilter(int threshold) { |
| 16 | this.threshold = threshold; |
| 17 | } |
| 18 | |
| 19 | public boolean accept(InferenceCommand<E,P,C,K,H,S> inferenceCommand, EventBus<E,P,C,K,H,S> bus) { |
| 20 | if (inferenceCommand.getInferenceContext().getInferenceChainLength()>threshold) { |
| 21 | logger.warning("Inference chain is too long ("+inferenceCommand.getInferenceContext().getInferenceChainLength()+") for inference command "+inferenceCommand+", command discarded"); |
| 22 | return false; |
| 23 | } |
| 24 | return true; |
| 25 | } |
| 26 | } |