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POHow do I add facts to working memory at runtime in the Drools DRL and retrieve them in the execution results of a stateless session?
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  1. POHow do I add facts to working memory at runtime in the Drools DRL and retrieve them in the execution results of a stateless session?
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    copied!<p><strong>Background:</strong></p> <p>I'm working on an application that transforms an input object into one of two output objects based upon a set of drools rules. The output object is not known until runtime and it is created in the first rule to execute.</p> <p>Here is the rule that creates the output object and an example transformation rule:</p> <pre><code>rule "Initialization" dialect "java" salience 1000 no-loop true when t : Trade() then if(t.getTran().getInsType().equalsIgnoreCase("EEO") || t.getTran().getInsType().equalsIgnoreCase("EEF")) { insert(new Option()); } else { insert(new Swap()); } end rule "Example Rule" dialect "java" when t : Trade() opt : Option() then opt.setCounterpartyName(t.getTran().getCParty()); end </code></pre> <p>Here is the code that is calling the rules:</p> <pre><code>private void test(){ for(File xmlFile : getXmlFilesFromDirectory(XML_DIRECTORY)) { Trade trade = (Trade)unmarshall(xmlFile, Trade.class); KnowledgeBase kbase = readKnowledgeBase(); StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession); List&lt;Command&gt; commands = new ArrayList&lt;Command&gt;(); commands.add(CommandFactory.newInsert(trade, "trade")); commands.add(CommandFactory.newFireAllRules()); ExecutionResults results = ksession.execute(CommandFactory.newBatchExecution(commands)); logger.close(); } } private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("security-transformation.drl"), ResourceType.DRL); KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors.size() &gt; 0) { for (KnowledgeBuilderError error: errors) { System.err.println(error); } throw new IllegalArgumentException("Could not parse knowledge."); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); return kbase; } </code></pre> <p><strong>Problem:</strong></p> <p>When I execute the rules I am not receiving the output object in my returned facts. I receive the trade object back but I do not get back the Option or the Swap object depending on which was added to working memory by the first rule.</p> <p><strong>Question:</strong></p> <p>How do I add facts to working memory at runtime in the drl and retrieve them in the execution results of a stateless session?</p> <p>EDIT: Do I need to use a drools query?</p>
 

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