我在我的代码中使用EasyRules API。以下是一个规则类，它访问application.properties中src/main/resources文件中的@Rule(name = "Over-weight rule") // to indicate that this class is a rule
@PropertySource("/application.properties")
public class OverweightRule {
/**
* The user input which represents the data
* that the rule will operate on.
*/
private Metric metric;
@Autowired
@Qualifier("alertServiceDao")
private AlertService alertService;
@Value("${base.weight}")
private double baseWeight;
public OverweightRule(Metric metric) {
this.metric = metric;
}
@Condition
public boolean isOverweight() {
// The rule should be applied only if the
// weight in metric object shoots 10% over the base weight.
if(metric.getWeight() > (baseWeight + (0.1 * baseWeight))) return true;
return false;
}
@Action
public void createAndStoreOverweightAlert() {
// When rule conditions are satisfied,
// an alert is created.
Alert alert = new Alert();
alert.setAlertType(Alert.AlertType.OVER_WEIGHT);
alert.setWeight(metric.getWeight());
alert.setTimeStamp(metric.getTimeStamp());
alertService.createAlert(alert);
}
}
文件的双精度值：
application.properties baseWeight中的值始终为0.0，而我在属性文件中将其设置为150.0。我读到Spring启动会自动从src/main/resources中的@PropertySource("/path to properties file")文件中读取值，因此无需使用@PropertySource。我仍然添加了@Configuration注释，但结果是一样的。这段代码有什么问题？我不想将{{1}}添加到此类中，因为我希望将此类保留为easy规则框架定义的Rule类。
答案 0 :(得分：1)
另一种方法是声明为@Component并移除@PropertySource并保留@Value("${base.weight}")
@Rule(name = "Over-weight rule") // to indicate that this class is a rule
@Component("myOverWeightRule")
public class OverweightRule {
创建rulesEngineFactoryBean后，您可以自动加载myOverWeightRule：
@Bean
@Autowired
RulesEngineFactoryBean rulesEngineFactoryBean(OverweightRule myOverweightRule){
RulesEngineFactoryBean rules = new RulesEngineFactoryBean();
rules.setRules(Arrays.asList(myOverweightRule));
return rules;
}
最后调用fireRules获取rulesEngineFactoryBean
RulesEngine rulesEngine
= (RulesEngine) ctx.getBean("rulesEngineFactoryBean");
rulesEngine.fireRules();