如何在Drool中激活选定的规则

2 回答

• -1

  您必须识别拥有的客户以及规则，或维护将客户与规则相关联的数据 . 我认为后者是首选，但我将概述两种解决方案 . 无论如何，必须通过事实来识别客户 .

  rule "some rule"
  when
      Customer( id in ("Smith&Co", "Brown&Sons", "Jones Inc." ) )
      ...
  then ... end
  

  要将客户与您需要的规则相关联：

  class Customer {
      private String name;
      private List<String> rules;
      //...
  }
  

  并写一个AgendaFilter

  class RuleFilter implements AgendaFilter {
      static List<Customer> customers = new ArrayList<>();
      static {
          customers.add(...);
          ...
      }
      static RuleFilter getFilterFor( String custname ){
           for( Customer cust: customers ){
               if( cust.getName().equals( custname ) ){
                   return cust;
               }
           }
           throw IllegalArgumentException( "no customer: " + custname );
      }
      Customer current;
      RuleFilter( Customer current ){
          this.current = current;
      }
      // ... getters & setters
      boolean accept( Match match ){
          return current.getRules().contains( match.getRule().getName() );
      }
  }
  

  并通过提供过滤器实例为客户运行会话：

  AgendaFilter currFilter = RuleFilter( getFilterFor( customername ) ); 
   fireAllRules( currFilter );
  

  回复于 2024-05-04T06:13:37+08:00
• 1

  static RuleFilter getFilterFor( String custname ){
           for( Customer cust: customers ){
               if( cust.getName().equals( custname ) ){
                   return cust;
               }
           }
  

  在方法签名中，您将返回RuleFilter，但在for循环中，您将返回cust，这是如何工作的？

  回复于 2024-05-04T06:13:37+08:00