流口水6-如何開火規則

Question

我無法在流口水6.0.1.Final中發布簡單的規則。 這是規則：

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

這是測試代碼，控制台沒有做輸出success 。

測試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，下面的代碼段按預期運行，並且控制台輸出success 。 問題是不贊成使用方法newStatefulKnowledgeSession 。 據我了解，這不是Drools 6中的處理方式。

測試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();

調試信息

我添加了一些調試行，以嘗試了解Test 1中出了什么問題。

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

輸出為：

==>[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]]

而在測試2中 ，輸出為：

==>[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]

底線

為什么測試1不觸發規則，而測試2是不觸發規則？

Answer 1

如果直接使用KieFileSystem，則必須確保內容反映所需的Maven結構。 因此，您應該寫：

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

或者，在資源上設置sourcePath並直接將其寫入：

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