Hi all,
I have some set of rules which work on same Person object but depending on
whether a person is student/employee/Faculty, the rule will have dfferent
logic.
So, I've made 3 .drl files, one will have all the rules for students, other
for employee and then last .drl for faculty. All 3 .drl have same package
name (as the first statement in drl) but all rules are named differently.
When my rule engine starts, it reads these 3 drl files and adds them to a
single rule base, starts a new session, inserts person in working memory and
fires rules.
Now, my questions are...is there anything odd/wrong with this approach?
Secondly, I had some rules names same in different drl and when I changed
them ....then I started getting null pointer exception error..... during
parsing of drl files. Any idea why is that?
code snippet:
list=new ArrayList<File>();
list.add(new File("students.drl"));
list.add(new File("emloyee.drl");
list.add(new File("faculty.drl"));
Iterator<File> it = list.iterator();
ruleBase = RuleBaseFactory.newRuleBase();
builder = new PackageBuilder();
Reader source=null;
while(it.hasNext())
{
source = new
InputStreamReader(RuleEngine.class.getResourceAsStream(it.next().toString()));
builder.addPackageFromDrl(source);
//if DRL has errors don't add it to the RuleBase
if(builder.hasErrors())
log4j.logError(RuleEngine.class,
builder.getErrors().toString());
else
ruleBase.addPackage(builder.getPackage());
}
workingMemory = ruleBase.newStatefulSession();
workingMemory.insert(person);
workingMemory.fireAllRules();
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