Drools 6.5 使用自定义议程过滤器执行特定规则不起作用

Question

我需要使用关联值执行特定规则，并尝试实现自定义议程过滤器一次只执行一个特定规则，但它似乎执行所有规则。我正在使用我这样定义的无状态会话：

   @Bean
     @ConditionalOnMissingBean(KieSession.class)
     public StatelessKieSession kieSession() throws IOException {   
         return kieContainer().newStatelessKieSession();
     } 

我迭代Map并执行每条规则的逻辑如下：

for (Map.Entry<Long, String> entry : ruleIdsAndData.entrySet()){

    List<Object> facts = new ArrayList<Object>();
    facts.add(entry.getValue());

    Map<String, String> ruleResponse = new HashMap<String, String>();
    kieSession.setGlobal("ruleResponse", ruleResponse);                     

    TrackingAgendaEventListener agendaEventListener = new TrackingAgendaEventListener();
    kieSession.addEventListener(agendaEventListener);

    String ruleName = myRuleService.retrieveRuleNameById(entry.getKey());               
    log.debug("Attempting to fire the following rule : " + ruleName);

    facts.add(new FireAllRulesCommand(new RuleNameEqualsAgendaFilter(ruleName)));   
    kieSession.execute(facts);

    log.debug("RuleResponse after rule has fired is : " + ruleResponse);                                                            
}

RuleNameEqualsAgendaFilter 类看起来像这样：

import lombok.extern.slf4j.Slf4j;
import org.kie.api.runtime.rule.AgendaFilter;
import org.kie.api.runtime.rule.Match;

    @Slf4j
    public class RuleNameEqualsAgendaFilter implements AgendaFilter {

        private final String ruleName;

        private final boolean accept;

        public RuleNameEqualsAgendaFilter(final String name) {
            this(name, true);
        }

        public RuleNameEqualsAgendaFilter(final String name, final boolean accept) {
            this.ruleName = name;
            this.accept = accept;
        }

        public String getName() {
            return ruleName;
        }

        public boolean isAccept() {
            return accept;
        }

        public boolean accept( Match match) {
            log.debug("Comparing : " + match.getRule().getName() + " to ruleName : " + this.ruleName);
            if (match.getRule().getName().equals(this.ruleName)) {
                return this.accept;
            } else {
                return !this.accept;
            }
        }
    }

知道为什么这会执行与我在ruleName 中指定的规则不同的规则吗？

Answer 1

在这里您将事实添加到列表中：

List<Object> facts = new ArrayList<Object>();
facts.add(entry.getValue());

在这里你添加另一个对象，一个 FireAllRulesCommand：

facts.add(new FireAllRulesCommand(new RuleNameEqualsAgendaFilter(ruleName))); 

然后你打电话给

kieSession.execute(facts);

插入所有事实，然后调用fireAllRules。所以 AgendaFilter 只是 WM 中的一个事实。

使用有状态会话，插入事实并以 AgendaFilter 作为参数调用 fireAllRules。