Process data returned by multiple rules (i.e. actions)

Hi,

I have a component on a .page which is having multiple rules associated to it. Now mulitple actions (from different rules) are returning data to the component to render.

I have a requirement to process those whole returned data in an java program before giving it to component xsl to render.

Is there any way avialable like using controller along with the Rule Datum or any other thing?

Any information would be really very helpful.

Thanks
Venus

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Comments

Rick Poulin

Yes, write a Java external that calls the rules engine yourself and then manipulates the returned org.dom4j.Element before returning it in your response document.

See RequestContext#executeRules(Element, List)

Venus00

Yes, write a Java external that calls the rules engine yourself and then manipulates the returned org.dom4j.Element before returning it in your response document.

See RequestContext#executeRules(Element, List)

Thanks Rick.

But the problem is, Rules are user configurable in the Rule Datum.

Like using requestContext.getThisComponentModel(), we can ge the runtime component XML section. can we somehow get the current reponse Element in an external or action retriever class?

Thanks
Venus

Rick Poulin

Just read the selected rules from the datum? If I'm missing something, tell me which OOTB class+method you're currently calling as your external.


/* Needs actual exception handling */
public Document customRulesExecution(RequestContext context) {
String rulenames = context.getParameterString("DatumNameContainingSelectedRules");
StringTokenizer tokens = new StringTokenizer(rulenames, ",");
List rules = new LinkedList();
while (tokens.hasMoreTokens()) {
  rules.add(new RuleExecDef(tokens.nextToken());
}
Document doc = Dom4jUtils.newDocument();
Element root = doc.addElement("whatever");
context.executeRules(root, rules);
// manipulate root with whatever you need
return doc;
}

Venus00

Rick,

I got your point. questions I have are,

* Can I have Rule Datum and External Datum in the same component? And * If yes, then in that case Rules configured will be executed 2 times i.e. one from the Rule Datum and another using the custom code (as described by you in your example). share your thoughts.
* If both will be executed then, what would be the order of their execution ?

Thanks
Venus

Rick Poulin

First, datums and externals are two separate things. Datums are content entry fields, externals are references to Java code that you want to execute. Datums (can) serve as parameters to externals, as yours does in this case.

Your rule datum isn't getting executed on its own. You either have an external at the component level, or a controller at the page/site level that's actually executing your rules (it could very well be an OOTB external/controller but someone in your team manually specified it somewhere). Once you find that, you can either remove it so that only your new custom external runs, or you'll at the very least be able to answer your "which comes first" question.

gits

I have similar question.
To answer the order of execution, it is Rules and then external. I verified that already by adding an external and a Rule to same component and checking the logs.

Your rule datum isn't getting executed on its own. You either have an external at the component level, or a controller at the page/site level that's actually executing your rules

I dont think I agree with the above statement from rpoulin. From my understanding when page having a component using a Rule datum is loaded, it makes LSCS call to get list of rules and than executes rule engine to match rules
and finally executs the Content Retrival class accossicated with matching rule.

so the question remains, how can we control execution of external if the rules engine finds matching results? We want to avoid running 2 queries. One from external and one from Rules Engine

Thanks
TeamSite

TeamsiteDev

Hi Rick,

I am using your code in my external to execute rules, but I am getting below exception :

2014-07-08 05:22:46,791 ERROR [com.interwoven.livesite.rules.engine.RulesEngineRuntimeExecutor] <Error><message>Rules engine error detected when requesting input model values</message><baseUri><![CDATA[http://<lscs-host>:1876/lscs/v1/]]></baseUri><response><root><error><![CDATA[com.interwoven.wcm.iwrr.core.ProjectNotFoundException: No project found with name: '//default/main/<teamsite Branch>'.
at com.interwoven.wcm.iwrr.dao.hibernate.AssetDaoHibernateImpl.resolveProjects(AssetDaoHibernateImpl.java:660)
at com.interwoven.wcm.iwrr.dao.hibernate.AssetDaoHibernateImpl.getDocumentsByPath(AssetDaoHibernateImpl.java:567)
at com.interwoven.wcm.iwrr.dao.hibernate.AssetDaoHibernateImpl.getDocumentByPath(AssetDaoHibernateImpl.java:202)
at com.interwoven.wcm.rules.engine.impl.RulesEngineLoaderImplLscs.getRuleCacheKey(RulesEngineLoaderImplLscs.java:195)
at com.interwoven.wcm.rules.engine.RulesEngine.getRule(RulesEngine.java:345)
at com.interwoven.wcm.iwrr.request.handler.RulesEngineRequestHandler.handlePost(RulesEngineRequestHandler.java:290)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy4.handlePost(Unknown Source)
at com.interwoven.wcm.iwrr.core.MainController.handleRequestInternal(MainController.java:208)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
at sun.reflect.GeneratedMethodAccessor104.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
at com.interwoven.wcm.iwrr.diagnostic.DiagnosticLogger.timingAdvice(DiagnosticLogger.java:118)
at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)

I have defined a Project name for all LSCS deployments from this Teamsite branch in lscs-authoring.xml , but I am unable to run Rules for this project. Rules execution is taking the teamsite branch as project , which does not exist in LSCS. How do I set LSCS project in RequestContext so that rules are executed correctly for context.executeRules(root, rules); ?

Thanks!

Rick Poulin

Doesn't look like you can override the logic to use custom project names. It's hardcoded in RulesEngineBaseExecutor#internalExecuteRule(). Is there any reason why you can't use branch paths as your project names? Because just quickly looking at it, rebuilding this piece doesn't look trivial both in effort and maintenance.

TeamsiteDev

Hi Rick,

Thanks for your reply .

In the content.properties file of LSDS where we define LSCS evironment details , there is one section for Rules Engine :

#
# LSCS Rules Engine Properties
#

# Whether to enable rule execution and rule management features
lscs.rules.enabled=true

But there are no examples of properties that can be defined here, no documentation/post on Support & Devnet site. Anyway I can find that out ?

Rick Poulin

There's no documentation for what hidden properties may exist, but it wouldn't help you in this case anyway. The code is hardcoded with project = context.getSite().getBranch(). The only way to change that is to build your own connector to the rules engine.

Snap 2016-07-11 at 09.04.54.png

Snap 2016-07-11 at 09.06.15.png

TeamsiteDev

Hi Rick,

I tried to trick the engine by doing :

context.getSite().setBranch("MyProject");

This resolved the old error of Project not found , but I am getting a different error now. Seems its unable to locate the Rule, Condition & Action , even though files are there.

------------------------------

<Error><message>Rules engine error detected when requesting input model values</message><baseUri><![CDATA[http://<lscs server>:1876/lscs/v1/]]></baseUri><response><root><error><![CDATA[java.lang.RuntimeException: Failed to locate asset document: iwov-resources/rules/ product.rule]
RulesEngineConfiguration {
BaseRulesDirectory=iwov-resources/rules/
BaseConditionsDirectory=iwov-resources/conditions/
BaseActionsDirectory=iwov-resources/actions/
BaseSegmentRulesDirectory=iwov-resources/actions/
}
project=MyProject
Project context={

6852837747396cba8678f28259e361b0
}
available projects={
//default/main/a
CSP
MyProject
}

at com.interwoven.wcm.rules.engine.impl.RulesEngineLoaderImplLscs.getRuleCacheKey(RulesEngineLoaderImplLscs.java:224)
at com.interwoven.wcm.rules.engine.RulesEngine.getRule(RulesEngine.java:345)
at com.interwoven.wcm.iwrr.request.handler.RulesEngineRequestHandler.handlePost(RulesEngineRequestHandler.java:290)
at sun.reflect.GeneratedMethodAccessor124.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy4.handlePost(Unknown Source)
at com.interwoven.wcm.iwrr.core.MainController.handleRequestInternal(MainController.java:208)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
at sun.reflect.GeneratedMethodAccessor104.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
at com.interwoven.wcm.iwrr.diagnostic.DiagnosticLogger.timingAdvice(DiagnosticLogger.java:118)
at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy7.handleRequest(Unknown Source)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.interwoven.wcm.iwrr.admin.AdminFilter.doFilter(AdminFilter.java:142)
at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)
]]></error></root></response><response_body><![CDATA[<?xml version="1.0" encoding="UTF-8"?>
<request><rules-to-execute><Rule> product.rule]</Rule></rules-to-execute><EventVisitor>3</EventVisitor></request>]]></response_body><request><rules-to-execute><Rule> product.rule]</Rule></rules-to-execute><EventVisitor>3</EventVisitor></request></Error>

---------------------------------------------------------

I guess this wont work Smiley Sad

Thanks for your reply.