Flowable-自定义规则引擎

业务中需要复杂的规则判断，或者flowable无法满足规则需求，或者需要调用自己的规则服务做判断

编写一个规则服务

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@Component
@Slf4j
public class RuleService {

    @Autowired
    private RuleEngineService ruleEngineService;

    public boolean execute(String ruleExpression, DelegateExecution execution) {
        log.info("开始执行规则 ================> {}", ruleExpression);
        Map<String, Object> variables = execution.getVariables();//获取全局变量
        Map<String, Object> variablesLocal = execution.getVariablesLocal();//获取局部变量
        log.info("variables -> {} ", variables.toString());
        log.info("variablesLocal -> {} ", variablesLocal.toString());
        Map<String, Object> param = new HashMap<>();
        param.putAll(variables);
        param.putAll(variablesLocal);
        Boolean ruleResult = ruleEngineService.executeRule(ruleExpression, param);
        log.info("规则[{}]执行结果 -> {}", ruleExpression, ruleResult);
        return ruleResult;
    }
}

RuleEngineService服务可以使用Groovy或者Drools实现，点击查看Groovy示例

在xml编写规则表达式时，可以直接改为调用RuleService.execute()

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<sequenceFlow id="Flow_1kh3iy1" name="审批通过&#38;&#38;f3==a" sourceRef="Gateway_0corauh" targetRef="Activity_1wg31no">
  <conditionExpression xsi:type="tFormalExpression">${ruleService.execute('<![CDATA[latestActionButton=="SP"&&formValue.f3=="a"]]>', execution)}</conditionExpression>
</sequenceFlow>