2:14 p.m.
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(a)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(a)lists.jboss.org [mailto:
rules-users-bounces(a)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...
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(a)datacert.com>
I’m working with Drools 5.
*From:* rules-users-bounces(a)lists.jboss.org [mailto:
rules-users-bounces(a)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(a)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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