Java Rule Engine Implementation | Together Java | Page 1

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@sonic halo has a question:

pedrobbarbosa

package com.hubpedro.nfsenacional.domain.engine;

import java.util.ArrayList;
import java.util.List;

public final class DpsRuleEngine {

    private final PredicateEvaluator evaluator = new PredicateEvaluator();

    public List<RuleResult> run(List<Rule> rules, DpsContext ctx) {
        List<RuleResult> results = new ArrayList<>(rules.size());
        for (Rule rule : rules) {
            results.add(runOne(rule, ctx));
        }
        return results;
    }

    public RuleResult runOne(Rule rule, DpsContext ctx) {
        if (rule.status() != RuleStatus.ATIVA) {
            return new RuleResult.Ok(rule.id());
        }
        for (String externFn : rule.requerExternos() == null ? List.<String>of() : rule.requerExternos()) {
            if (!ctx.hasFunction(externFn)) {
                return new RuleResult.Skipped(rule.id(),
                        "Função externa requerida não disponível no contexto: " + externFn);
            }
        }
        boolean activated = evaluator.eval(rule.predicadoP(), ctx);
        if (!activated) return new RuleResult.Ok(rule.id());
        boolean satisfied = evaluator.eval(rule.predicadoQ(), ctx);
        if (satisfied) return new RuleResult.Ok(rule.id());
        return new RuleResult.Reject(rule.id(), rule.onViolation().reject(), rule.onViolation().message());
    }
}

anyone to help me make this better

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<@&987246883653156906> please have a look, thanks.

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``` package com.hubpedro.nfsenacional.domain.engine; import java.util.ArrayList; import java.util.List; public final class DpsRuleEngine { private final PredicateEvaluator evaluator = new PredicateEvaluator(); public List<RuleResult> run(List<R

Here is a concise review based on the old supplied DpsRuleEngine code:

Final class: Good to avoid inheritance if not intended.
PredicateEvaluator Initialization: The field evaluator is being initialized inline which is fine, but the class name suggests an incomplete or broken statement (PredicateEvaluator evaluator = new Predi)—possibly a copy-paste or truncation error.
Immutability: Fields should be final or properly encapsulated if the class is designed as immutable.
Code Completeness: The sample cuts off early; no methods or functionality visible, making it difficult to assess logical flow, exception handling, or rule evaluation strategies.
Design Suggestions: For a rule engine, consider:
- Explicit method interfaces for adding/removing rules.
- Clear evaluation mechanism.
- Thread-safety concerns if used concurrently.
Naming: DpsRuleEngine is context-specific; ensure naming clarity for maintainability.
Dependencies & Imports: Only standard Java imports visible; check for required additional utilities.

#Java Rule Engine Implementation

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