Drools 6 - 如何触发规则

Question

我在 drools 6.0 中触发简单规则时遇到问题。1.Final。这是规则：

package org.drools.test
rule "test rule"
when
    eval(true)
then
    System.out.println("success");
end

这是测试代码，控制台不输出success。

测试 1

// Create kie file system
KieServices kieServices = KieServices.Factory.get();
KieFileSystem kfs = kieServices.newKieFileSystem();

// Add rule
Resource resource = ResourceFactory.newByteArrayResource(src.getBytes());
kfs.write("org.drools.test.testrule.drl", resource);
kieServices.newKieBuilder(kfs).buildAll();

// Create session
KieContainer kieContainer = kieServices.newKieContainer(kieServices.getRepository().getDefaultReleaseId());
KieBaseConfiguration kbaseConf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null, RuleBaseConfiguration.class.getClassLoader());
KieBase kieBase = kieContainer.newKieBase(kbaseConf);
KieSession kieSession = kieBase.newKieSession();
kieSession.insert("Test object");

// Fire
kieSession.fireAllRules();
kieSession.dispose();

相比之下，下面的代码片段按预期运行，并且控制台输出 success。问题是方法 newStatefulKnowledgeSession 已被弃用。据我了解，这不是在 Drools 6 中做事的方式。

测试 2

Resource resource = ResourceFactory.newByteArrayResource(src.getBytes());
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(resource, ResourceType.DRL);
StatefulKnowledgeSession ksession = kbuilder.newKnowledgeBase().newStatefulKnowledgeSession();
ksession.insert("Test object");
ksession.fireAllRules();
ksession.dispose();

调试信息

我添加了一些调试行，试图理解 测试 1.

中出了什么问题

kieSession.addEventListener(new DebugAgendaEventListener());
kieSession.addEventListener(new DebugRuleRuntimeEventListener());

输出为：

==>[ObjectInsertedEventImpl: getFactHandle()=[fact 0:1:1784206373:1217562221:1:DEFAULT:NON_TRAIT:Test object], getObject()=Test object, getKnowledgeRuntime()=org.drools.core.impl.StatefulKnowledgeSessionImpl@4984cabc, getPropagationContext()=PhreakPropagationContext [entryPoint=EntryPoint::DEFAULT, factHandle=[fact 0:1:1784206373:1217562221:1:DEFAULT:NON_TRAIT:Test object], leftTuple=null, originOffset=-1, propagationNumber=2, rule=null, type=0]]

而在 测试 2 中，输出是：

==>[ObjectInsertedEventImpl: getFactHandle()=[fact 0:1:1784206373:1217562221:1:DEFAULT:NON_TRAIT:Test object], getObject()=Test object, getKnowledgeRuntime()=org.drools.core.impl.StatefulKnowledgeSessionImpl@9738e1b, getPropagationContext()=PhreakPropagationContext [entryPoint=EntryPoint::DEFAULT, factHandle=[fact 0:1:1784206373:1217562221:1:DEFAULT:NON_TRAIT:Test object], leftTuple=null, originOffset=-1, propagationNumber=2, rule=null, type=0]]
==>[ActivationCreatedEvent: getActivation()=[[ test rule active=false ] [ null [fact 0:0:1771273200:1306428912:0:DEFAULT:NON_TRAIT:org.drools.core.reteoo.InitialFactImpl@4dde85f0] ] ], getKnowledgeRuntime()=org.drools.core.impl.StatefulKnowledgeSessionImpl@9738e1b]
==>[BeforeActivationFiredEvent:  getActivation()=[[ test rule active=false ] [ null [fact 0:0:1771273200:1306428912:0:DEFAULT:NON_TRAIT:org.drools.core.reteoo.InitialFactImpl@4dde85f0] ] ], getKnowledgeRuntime()=org.drools.core.impl.StatefulKnowledgeSessionImpl@9738e1b]
success
==>[AfterActivationFiredEvent: getActivation()=[[ test rule active=false ] [ null [fact 0:0:1771273200:1306428912:0:DEFAULT:NON_TRAIT:org.drools.core.reteoo.InitialFactImpl@4dde85f0] ] ], getKnowledgeRuntime()=org.drools.core.impl.StatefulKnowledgeSessionImpl@9738e1b]

底线

为什么 测试 1 没有触发规则，而 测试 2 是？

Answer 1

如果直接使用KieFileSystem，必须确保内容反映了所需的maven结构。所以，你应该写：

kfs.write("src/main/resources/org.drools.test.testrule.drl", resource);

或者，在资源上设置 sourcePath 并直接写入：

resource.setSourcePath( "org.drools.test.testrule.drl" );
kfs.write( resource );

Drools 6 - 如何触发规则

Drools 6 - How to Fire Rule

java

drools