如何使用Drools debugWorkingMemorylistener？

Question

以下代码行直接来自文档

ksession.addEventListener(new DebugWorkingMemoryEventListener());

在eclipse中提示以下错误

  

方法中的addEventListener（WorkingMemoryEventListener）方法   WorkingMemoryEventManager不适用于参数   （DebugWorkingMemoryEventListener）

Answer 1

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

在我们的例子中，以下代码可以正常工作：

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);
    }
});