如何在Drools规则中使用Spring Service? [英] How to use a Spring Service in Drools rules?

问题描述

我正在使用流口水引擎来构建警报系统.当条件满足时，我们需要对规则(RHS)的操作执行由Spring Framework实例化的 @Service 方法.

I'm working with drools engine in the construction of an alert system. we need to execute a method of a @Service instantiated by Spring Framework on the actions of the rule (RHS), when the conditions are met.

如何获取由Spring Framework创建的 @service实例，以供Drools规则的操作(RHS)使用?

What would be the way to get the @service instance created by Spring Framework to be used by the action (RHS) of the Drools rule?

我已遵循以下指示:

1. 使用表格导入功能( Rule1.drl ).该解决方案不起作用，因为该类是在drool中实例化的，并且需要执行静态方法.
2. 使用全局会话变量( Rule2.drl ).此解决方案在运行时"抛出一个异常，表明它不是同一类类型.

1. Using the form import function (Rule1.drl). This solution does not work because the class is instantiated in drools and requires static methods to be executed.
2. Using a global Session variable (Rule2.drl). This solution throws me an exception at "runtime" indicating that it is not the same class type.

关于如何使用它的任何想法?

Any ideas on how to use it?

为

文件: Rule1.drl

package com.mycompany.alerts.Alert;

import function com.mycompany.alerts.service.SecurityService.notifyAlert;

rule "Activate Alert Type"
salience 9000
when
  $alert: Alert(type == "TYPE1") 
then
  System.out.println("Running action:" + drools.getRule().getName());
  $alert.setActive(Boolean.TRUE);
  notifyAlert($alert.getStatus(),$alert.getSmsNumber());    
  System.out.println("End action:" + drools.getRule().getName());
end

文件: Rule2.drl

package com.mycompany.alerts.Alert;

global com.mycompany.alerts.service.SecurityService securityService;

rule "Activate Alert Type 2"
salience 9000
when
  $alert: Alert(type == "TYPE2") 
then
  System.out.println("Running action:" + drools.getRule().getName());
  $alert.setActive(Boolean.TRUE);
  securityService.notifyAlert($alert.getStatus(),$alert.getSmsNumber());    
  System.out.println("End action:" + drools.getRule().getName());
end

文件: SecurityService.java

package com.mycompany.alerts.service;

import com.mycompany.alerts.service.UserRepository;

@Service
@Transactional
public class SecurityService {

    private final Logger log = LoggerFactory.getLogger(SecurityService.class);

    private final UserRepository userRepository;

    public SecurityService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public void notifyAlert(String status, String sms) {
         System.out.println("Alert notify with:" + status + " sms:" + sms);
    }

}

推荐答案

您可以将kieRuntime的setGlobal函数用作:

You can use the setGlobal function of kieRuntime as:

kieRuntime.setGlobal("securityService", securityService);

然后，您可以在drl文件中以以下方式声明/使用此变量:

then you can declare/use this variable in your drl file as :

global SecurityService securityService.

PS:-可以通过以下方式获得KieRuntime对象:KieRuntime kieRuntime =(KieRuntime)kieSssion;

PS:- KieRuntime object can be obtained as: KieRuntime kieRuntime = (KieRuntime) kieSssion;

这篇关于如何在Drools规则中使用Spring Service?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！