java - can we access working memory fact of drools rule engine in jbpm6 script task? -


is there way access working memory fact of drools rule engine in jbpm6 script task?

i have model class : application.java rule : check if salary > 10000 (part of rule group : salarycheck )

jbpm flow : start -> salarycheck(rule task, associated rule group : salarycheck) -> updatescore(script task) -> end

updatescore - script rask code:

system.out.println(system.out.println((application)(kcontext.getkieruntime().getfacthandles().toarray()[0]));

error:

java.lang.classcastexception: org.drools.core.common.defaultfacthandle cannot cast org.model.application

updated script task:

import org.model.application import org.drools.runtime.rule.queryresults import org.drools.runtime.rule.queryresultsrow  queryresults results = kcontext.getkieruntime().getqueryresults( "getobjectsofapplication" );  ( queryresultsrow row : results ) {     application applicantion = ( application ) row.get( "$result" );      application.setscore(700);     system.out.println("application object :: "+ application); }

added query rule drl file

query "getobjectsofapplication"     $result: application() end

getfacthandles() not method looking for. method think looking getobjects(). either way, getting first element of returned collection without validation seems dangerous me. can't guarantee order of elements in returned collection remain same between different invocations.

a better approach use version of getobjects() accepts objectfilter parameter. better , more 'declarative' approach define query in returns exact object looking for. can execute query using kcontext.getkieruntime().getqueryresults().

you can better understanding on of these 2 approaches (using objectfilter or query) in thread: retrieving facts of specific type working memory

edit:

the post suggested using query or objectfilter drools 5 code. in drools 6, api classes moved different package. these imports should use if want invoke query in code:

  • org.kie.api.runtime.rule.queryresults
  • org.kie.api.runtime.rule.queryresultsrow

these classes both part of kie-api project.


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