[rules-users] How to execute a Process API result?

[Mauricio Salatino]

That are only the fluent api to create processes. I recommend you the other
approach:

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newClassPathResource("MyProcess.rf"),
              ResourceType.DRF );
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
    for (KnowledgeBuilderError error: errors) {
        System.err.println(error);
    }
    throw new IllegalArgumentException("Could not parse knowledge.");
}


KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());

StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();


ksession.startProcess("com.sample.MyProcess");


If you need the reference to the process instance you can do:
WorkFlowProcessInstance processInstance = ksession.startProcess(...);



Work
2009/11/2 Scott Stevenson <scott.stevenson at datacert.com>

>  I read that section but I’m still not clear how to add my process
> (created like the section just before) to the KnowledgeBase. Section 3.2
> shows adding an existing .rf file.  I have this code:
>
>
>
> RuleFlowProcessFactory factory =
> RuleFlowProcessFactory.createProcess("org.drools.sample.workflow.dynamic");
>
>                 factory
>
>                     .name("HelloWorldRuleSet")
>
>                     .version("1.0")
>
>                     .packageName("org.drools")
>
>                     .startNode(1).name("Start").done()
>
>                     .actionNode(2)
>
>                         .name("Action")
>
>                         .action("java", "System.out.println(\"Inside Action
> 1\");").done()
>
>                     .endNode(3).name("End").done()
>
>                     .connection(1, 2)
>
>                     .connection(2, 3);
>
>                 factory.validate().getProcess();
>
>
>
> How does the getProcess() result get added to a KnowledgeBase?
>
>
>
> Thanks,
>
> Scott
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Mauricio Salatino
> *Sent:* Monday, November 02, 2009 1:57 PM
>
> *To:* Rules Users List
> *Subject:* Re: [rules-users] How to execute a Process API result?
>
>
>
> Ok, so you need to start using the Drools 5 APIs.
> Please take a look at the Drools 5 documentation:
>
> http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-flow/html_single/index.html#d0e1375
>
> In the section 3.2
> Using a Process in Your Application
>
>
> you will find the correct api's.
> Greetings.
>
> 2009/11/2 Scott Stevenson <scott.stevenson at datacert.com>
>
> I’m working with Drools 5.
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Mauricio Salatino
> *Sent:* Monday, November 02, 2009 1:45 PM
> *To:* Rules Users List
> *Subject:* Re: [rules-users] How to execute a Process API result?
>
>
>
> Are you working just with the Drools 4 version?
> Or you can jump to the Drools 5 version?
>
> On Mon, Nov 2, 2009 at 5:41 PM, Scott Stevenson <
> scott.stevenson at datacert.com> wrote:
>
> I'm trying to execute the result of the Process API and running into
> problems most likely stemming from my ignorance. I'm creating a new
> process following the sample code from section 3.1.3.2 of the User
> Guide. My sample process consists of:
> 1. StartNode
> 2. ActionNode that prints Hello World
> 3. EndNode
>
> What I don't understand is how to get my new process into a
> KnowledgeBase and KnowledgeSession for execution. I've tried the
> following (Drools 4 method, I believe) as well:
>
>        AbstractRuleBase ruleBase = (AbstractRuleBase)
> RuleBaseFactory.newRuleBase();
>        ruleBase.addProcess(createProcess());
>        InternalWorkingMemory workingMemory = new ReteooWorkingMemory(1,
> ruleBase);
>
> workingMemory.startProcess("org.drools.sample.workflow.dynamic");
>
> The result of the previous code is a RuntimeException (unable to execute
> Action). Inner exception is null pointer from inside the
> ActionNodeInstance class. Where am going wrong in implementing the
> Process API?
>
> Thank you,
> Scott Stevenson
>
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>
>
>
>
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> - http://www.jbug.com.ar
> - Salatino "Salaboy" Mauricio -
>
>
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>
>
>
>
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> - http://www.jbug.com.ar
> - Salatino "Salaboy" Mauricio -
>
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