如何使用Drools debugWorkingMemorylistener？

Question

下面的代码行直接从文档

ksession.addEventListener(new DebugWorkingMemoryEventListener()); 

提示以下错误在eclipse

在类型 WorkingMemoryEventManager的方法的addEventListener（WorkingMemoryEventListener）是不适用的参数 （DebugWorkingMemoryEventListener ）

Answer 1

您可能会导入org.drools.event.DebugWorkingMemoryEventListener而不是org.drools.event.rule.DebugWorkingMemoryEventListener。

在我们的例子，下面的代码工作得很好：

import org.drools.event.rule.DebugWorkingMemoryEventListener; 
import org.drools.event.rule.ObjectInsertedEvent; 
import org.drools.event.rule.ObjectRetractedEvent; 
import org.drools.event.rule.ObjectUpdatedEvent; 
... 
StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); 
ksession.addEventListener(new DebugWorkingMemoryEventListener() { 
    @Override 
    public void objectInserted(ObjectInsertedEvent event) { 
     System.out.println(event); 
    } 

    @Override 
    public void objectRetracted(ObjectRetractedEvent event) { 
     System.out.println(event); 
    } 

    @Override 
    public void objectUpdated(ObjectUpdatedEvent event) { 
     System.out.println(event); 
    } 
});