RE: [rules-users] HelloWorld Example for drools4MR3
Hi Joshua, You *should* be able to change assertObject(...) to simply insert(...). I am sure examples will be updated at some stage (I know the JBoss Drools team always welcome community support). With kind regards, Mike -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joshua Jackson Sent: 12 July 2007 02:19 To: Rules Users List Subject: Re: [rules-users] HelloWorld Example for drools4MR3 Hi Mike, Thanks for the reply. Shall I recall this as an not-yet-updated examples? So what should I use for those example to change assertObject? Thanks in advance On 7/11/07, Anstis, Michael (M.) [EMAIL PROTECTED] wrote: Hi Joshua, If I recall correctly; assertObject(), modifyObject() and retractObject() became insert(), update() and remove()? in 4.0. With kind regards, Mike -- It's not just about coding, it's a matter of fulfilling you core being YM!: thejavafreak Blog: http://joshuajava.wordpress.com/ ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Rule compilation errors under heavy load
Hello folks, I'm experiencing some odd behaviour from Drools (or maybe the Eclipse compiler) when load-testing my application, and wondered if anyone else had experienced the same issue. I have a web service which, for every request, loads in rules from the database, creates a org.drools.lang.descr.PackageDescr and then uses this to create a org.drools.rule.Package. The code is something like: PackageBuilderConfiguration conf = new PackageBuilderConfiguration(); PackageBuilder builder = new PackageBuilder(conf); PackageDescr packageDescr = new PackageDescr(MyRulebaseName); populatePackageDescr(packageDescr); builder.addPackage(packageDescr); Package _package = builder.getPackage(); return _package; This code gets run every request. The populatePackageDescr() method adds imports, globals, functions and rules to the PackageDescr. My load-test just repeatedly calls the same rulebase, so populatePackageDescr() will be doing exactly the same thing for each request. Occasionally (normally once or twice per 100 requests) I get a rule compilation error (the exact error varies from request to request) whereas most of the time the same rule compiles fine. This makes me suspect a thread-safety issue in either the PackageBuilder or the compiler (I'm using the eclipse compiler). Initially, I suspected a problem in my populatePackageDescr(packageDescr) method, but I think I've ruled this out. There is nothing stateful in this method, and I've tried dumping the XML representation of the packageDescr immediately after populating it; it looks fine to me and is exactly the same whether compilation succeeds or and fails. Has anyone done this kind of thing successfully under a heavy load? Thanks, Dean. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Can't execute rules twice with a second classloader
I am trying to sequentially perform two rules executions using two
different classloaders in the same VM. I create completely new state
for each execution, yet I still fail on the second execution. I
believe this has to do with some internal static cached state that
JBossRules is maintaining. A snippet of the code and exeception are
shown in this email.
public void demo() throws Exception {
// Save original classloader
ClassLoader original = Thread.currentThread().getContextClassLoader();
// Create Classloader 1 with parent of original
FooClassLoader loader1 = new FooClassLoader(original);
Thread.currentThread().setContextClassLoader(loader1);
testRules();
// Success so far...
// Create Classloader 2 with parent of original
FooClassLoader loader2 = new FooClassLoader(original);
Thread.currentThread().setContextClassLoader(loader2);
testRules();
// Never make it to here.
// Restore
Thread.currentThread().setContextClassLoader(original);
}
private void testRules() throws Exception {
PackageBuilder builder = new PackageBuilder();
Package pkg = buildPackage(new String[] { Foo.drl }, builder);
RuleBase base = RuleBaseFactory.newRuleBase();
base.addPackage(pkg);
StatelessSession session = base.newStatelessSession();
final ClassLoader loader =
Thread.currentThread().getContextClassLoader();
Object inst = loader.loadClass(com.foo.Foo).newInstance();
session.execute(new Object[] { inst });
}
Exception in thread main java.lang.ClassCastException:
adixon.prototype.rules.classloader.demo.copy.FooShadowProxy
at
org.drools.base.adixon.prototype.rules.classloader.demo.copy.Foo$getName.getValue(Unknown
Source)
at
org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:94)
at
org.drools.base.evaluators.StringFactory$StringEqualEvaluator.evaluate(StringFactory.java:85)
at
org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:61)
at
org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:82)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:121)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:20)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:159)
at org.drools.reteoo.Rete.assertObject(Rete.java:175)
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:772)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:584)
at
org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:63)
at
adixon.prototype.rules.classloader.demo.copy.Driver.testRules(Driver.java:47)
at
adixon.prototype.rules.classloader.demo.copy.Driver.go(Driver.java:33)
at
adixon.prototype.rules.classloader.demo.copy.Driver.main(Driver.java:17)
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Re: [rules-users] Rule compilation errors under heavy load
Is it possible for you to provide a test case capable of reproducing the problem? At the same time, I would suggest you to not follow such approach in your application. Compilation is an extremely heavy process and should not be done for each request. The ideal approach is to pre-compile (for instance, we have a contributed ant-task for that) and serialize your rulebase to your database or filesystem, or at least, compile it only once and cache it at runtime. []s Edson 2007/7/12, Dean Jones [EMAIL PROTECTED]: Hello folks, I'm experiencing some odd behaviour from Drools (or maybe the Eclipse compiler) when load-testing my application, and wondered if anyone else had experienced the same issue. I have a web service which, for every request, loads in rules from the database, creates a org.drools.lang.descr.PackageDescr and then uses this to create a org.drools.rule.Package. The code is something like: PackageBuilderConfiguration conf = new PackageBuilderConfiguration(); PackageBuilder builder = new PackageBuilder(conf); PackageDescr packageDescr = new PackageDescr(MyRulebaseName); populatePackageDescr(packageDescr); builder.addPackage(packageDescr); Package _package = builder.getPackage(); return _package; This code gets run every request. The populatePackageDescr() method adds imports, globals, functions and rules to the PackageDescr. My load-test just repeatedly calls the same rulebase, so populatePackageDescr() will be doing exactly the same thing for each request. Occasionally (normally once or twice per 100 requests) I get a rule compilation error (the exact error varies from request to request) whereas most of the time the same rule compiles fine. This makes me suspect a thread-safety issue in either the PackageBuilder or the compiler (I'm using the eclipse compiler). Initially, I suspected a problem in my populatePackageDescr(packageDescr) method, but I think I've ruled this out. There is nothing stateful in this method, and I've tried dumping the XML representation of the packageDescr immediately after populating it; it looks fine to me and is exactly the same whether compilation succeeds or and fails. Has anyone done this kind of thing successfully under a heavy load? Thanks, Dean. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] NullPointerException while deleting the rule package
This problem was supposed to be fixed in MR3. Can you please provide a self contained test and attach it to a JIRA so I can investigate and fix? Thank you, Edson 2007/7/12, Sarika Khamitkar [EMAIL PROTECTED]: This is the again regarding the NullPointerException issue. Sorry for resending this message again. But I would really appreciate a response on how this can be resolved. The following is the exception I get while removing a package from the RuleBase. java.lang.NullPointerException at org.drools.reteoo.CompositeObjectSinkAdapter.removeObjectSink( CompositeObjectSinkAdapter.java:125) at org.drools.reteoo.ObjectSource.removeObjectSink( ObjectSource.java:123) at org.drools.reteoo.ObjectTypeNode.removeObjectSink( ObjectTypeNode.java:297) at org.drools.reteoo.ObjectTypeNode.remove(ObjectTypeNode.java :232) at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:187) at org.drools.reteoo.AlphaNode.remove(AlphaNode.java:187) at org.drools.reteoo.BetaNode.remove(BetaNode.java:185) at org.drools.reteoo.BetaNode.remove(BetaNode.java:187) at org.drools.reteoo.RuleTerminalNode.remove( RuleTerminalNode.java:439) at org.drools.reteoo.ReteooBuilder.removeRule( ReteooBuilder.java:135) at org.drools.reteoo.ReteooRuleBase.removeRule( ReteooRuleBase.java:259) at org.drools.common.AbstractRuleBase.removePackage( AbstractRuleBase.java:408) …. This exception has been occurring after I recently switched to 4.0 MR3. Thanks. -- *From:* [EMAIL PROTECTED] [mailto: [EMAIL PROTECTED] *On Behalf Of *Sarika Khamitkar *Sent:* Wednesday, July 11, 2007 6:31 PM *To:* rules-users@lists.jboss.org *Subject:* [rules-users] NullPointerException while deleting the rule package Sorry for resending the message. This is an urgent issue and if anybody has encountered this problem, can you please let me know how it can be resolved? If I have over 3 packages in the RuleBase and I try to remove one of those packages, then I get a NullPointerException. Thanks. -- *From:* [EMAIL PROTECTED] [mailto: [EMAIL PROTECTED] *On Behalf Of *Sarika Khamitkar *Sent:* Wednesday, July 11, 2007 3:34 PM *To:* rules-users@lists.jboss.org *Subject:* [rules-users] NullPointerException while deleting the rule package Hi, I am trying a remove a rule from the RuleBase using the following syntax and get a NullPointerException: ruleBase.removePackage(rule2392016206); Before removing the package, I am iterating through all the packages in the ruleBase and I can see this package name in the list. I am not sure why this exception is being thrown then. I am using 4.0 MR3. Has this feature changed since 3.0.6? Thanks. Sarika ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Rule compilation errors under heavy load
Hi Edson,
On 7/12/07, Edson Tirelli [EMAIL PROTECTED] wrote:
Is it possible for you to provide a test case capable of reproducing the
problem?
I've written a quick test case, which is attached. When numberOfThreads==1,
everything compiles okay. When numberOfThreads==100, I get function
compilation errors and CompileExceptions from mvel. Clearly there is
nothing shared between these threads as a new test class is created
per thread. If you synchronise the calls to addPackage() and
getPackage() using the class monitor i.e.
synchronized (DroolsLoadTest.class) {
builder.addPackage(packageDescr);
builder.getPackage();
}
then the problems go away. Hope this helps.
At the same time, I would suggest you to not follow such approach in your
application. Compilation is an extremely heavy process and should not be
done for each request. The ideal approach is to pre-compile (for instance,
we have a contributed ant-task for that) and serialize your rulebase to your
database or filesystem, or at least, compile it only once and cache it at
runtime.
That's very sensible advice. Our situation is slightly different as
users are allowed to change the rules used by a running service, so we
need to reflect any changes when a new request comes in. We are
planning to apply caching if performance is an issue, but we were
trying to assess performance of application under load when this
thread safety issue arose.
Thanks for your help,
Dean.
import org.drools.compiler.DroolsError;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.compiler.PackageBuilderErrors;
import org.drools.lang.descr.FunctionDescr;
import org.drools.lang.descr.ImportDescr;
import org.drools.lang.descr.PackageDescr;
public class DroolsLoadTest {
public DroolsLoadTest() {
}
public void runTest() {
PackageBuilderConfiguration packageBuilderConfig = new PackageBuilderConfiguration();
org.drools.compiler.PackageBuilder builder = new org.drools.compiler.PackageBuilder(packageBuilderConfig);
PackageDescr packageDescr = new PackageDescr(MyRulebase);
addImports(packageDescr);
addFunctions(packageDescr);
builder.addPackage(packageDescr);
builder.getPackage();
if (builder.hasErrors()) {
PackageBuilderErrors errors = builder.getErrors();
for (DroolsError error : errors.getErrors()) {
System.out.println(ERROR: + error.getMessage());
}
}
}
private void addImports(PackageDescr packageDescr) {
packageDescr.addImport(new ImportDescr(java.util.List));
packageDescr.addImport(new ImportDescr(java.util.ArrayList));
packageDescr.addImport(new ImportDescr(java.util.LinkedList));
packageDescr.addImport(new ImportDescr(java.util.Set));
packageDescr.addImport(new ImportDescr(java.util.HashSet));
packageDescr.addImport(new ImportDescr(java.util.SortedSet));
packageDescr.addImport(new ImportDescr(java.util.TreeSet));
}
private void addFunctions(PackageDescr packageDescr) {
FunctionDescr functionDescr = new FunctionDescr(foo, void);
functionDescr.addParameter(String, arg1);
String body =
Set myHashSet = new HashSet(); +
myHashSet.add(arg1); +
List myArrayList = new ArrayList(); +
myArrayList.add(arg1); +
List myLinkedList = new LinkedList(); +
myLinkedList.add(arg1); +
Set myTreeSet = new TreeSet(); +
myTreeSet.add(arg1);;
functionDescr.setText(body);
packageDescr.addFunction(functionDescr);
}
public static void main(String[] args) {
int numberOfThreads = 100;
Thread[] threads = new Thread[numberOfThreads];
for (int i = 0; i numberOfThreads; i++) {
Thread testThread = new Thread() {
public void run() {
DroolsLoadTest test = new DroolsLoadTest();
test.runTest();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
threads[i] = testThread;
testThread.start();
}
}
}
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[rules-users] Examples moving
Hi peeps, Just to be consistence, the drools-example directory now contains examples projects and not an eclipse project anymore: trunk -drools-examples -drools-examples-drl -drools-examples-brms -drools-examples-* Im about to add a xml test project and improve brms examples. Let me know if something isn't working fine. Regards Fernando Meyer Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 8524-1298 JBoss, a division of Red Hat @ www.jboss.com GPG: 47C0 F16E 0387 F4DF 7EBC 8E3C 7AF1 8D55 AB29 DA3A ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] how to create local variable
Folks, I have a rule where I am repeating part of it twice : ($cs.getSuppCode().substring(4, 6)), and I would like to replace it with variable... how can I do that? The solution with in doesn't worl because it is a java code needed to perform calculations for variable. Please see the rule below: rule SupplierView: Headquarter Supplier Code should end on 25 or 30. when $cs : SupplierView(corporate == true) eval($cs.getSuppCode().substring(4, 6) == 25 || $cs.getSuppCode().substring(4, 6) == 30) then ValidationErrorFacade.getInstance().registerError($cs, new ValidationError(Headquarter Supplier Code should end on 25 or 30.)); end Thanks, -Sergey ** ** LEGAL DISCLAIMER ** ** This E-mail message and any attachments may contain legally privileged, confidential or proprietary information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this E-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this E-mail message from your computer.___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Re: Using JDK dynamic proxies as facts
OK, I just solved my own problem. My proxy had no package, since the jdk
based proxy is only in a package if it has at least 1 non public interface,
according to the javadoc.
The suspect code beginning on line 333 is:
String pkgName = cls.getPackage().getName();
if ( org.drools.reteoo.equals( pkgName ) ||
org.drools.base.equals(
pkgName ) ) {
// We don't shadow internal classes
this.shadowEnabled = false;
return;
}
The getPackage() method returns null. In this case, it would be good if
JBoss Rules handled the null and went on to shadow the object anyway, since
it is obviously not in the org.drools packages.
Now I'll continue trying to build a test case for my original problem.
Shall I enter a JIRA for this issue?
Thanks,
-Chris West
On 7/12/07, Chris West [EMAIL PROTECTED] wrote:
Hello,
I'm trying to use objects that are generated as dynamic proxies (through
the java.lang.reflect.Proxy class) as facts in JBoss Rules 4.0 MR3. My
project was using CGLib to generate proxies, and they were working just fine
in 3.0.6. However, when I tried 4.0, the CGLib based proxies seemed to
have a final method that kept the proxies from being proxied as shadow
facts. So I rewrote my code to try to use JDK based proxies, and version
4.0 MR3 accepts them and apparently creates shadow facts, but now my rules
don't fire correctly.
So, in an attempt to create a simple program to illustrate the problem, I
ran into a different problem. The attached eclipse project illustrates this
problem.
The error is:
java.lang.NullPointerException
at org.drools.reteoo.Rete$ObjectTypeConf.init(Rete.java:333)
at org.drools.reteoo.Rete.assertObject(Rete.java:152)
at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java
:190)
at org.drools.reteoo.ReteooWorkingMemory.doInsert(
ReteooWorkingMemory.java:70)
at org.drools.common.AbstractWorkingMemory.insert(
AbstractWorkingMemory.java:772)
at org.drools.common.AbstractWorkingMemory.insert (
AbstractWorkingMemory.java:584)
at com.sample.DroolsTest.main(DroolsTest.java:42)
Has anyone successfully used JDK based dynamic proxies as facts?
Thanks,
-Chris West
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Re: [rules-users] Using JDK dynamic proxies as facts
Chris, It seems like a bug to me. May I ask you please to open a JIRA and attach your project? We are trying to fix final bugs for MR4 and keeping all of them in JIRA will avoid us to miss anyone... Thanks []s Edson 2007/7/12, Chris West [EMAIL PROTECTED]: Hello, I'm trying to use objects that are generated as dynamic proxies (through the java.lang.reflect.Proxy class) as facts in JBoss Rules 4.0 MR3. My project was using CGLib to generate proxies, and they were working just fine in 3.0.6. However, when I tried 4.0, the CGLib based proxies seemed to have a final method that kept the proxies from being proxied as shadow facts. So I rewrote my code to try to use JDK based proxies, and version 4.0 MR3 accepts them and apparently creates shadow facts, but now my rules don't fire correctly. So, in an attempt to create a simple program to illustrate the problem, I ran into a different problem. The attached eclipse project illustrates this problem. The error is: java.lang.NullPointerException at org.drools.reteoo.Rete$ObjectTypeConf.init(Rete.java:333) at org.drools.reteoo.Rete.assertObject(Rete.java:152) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java :190) at org.drools.reteoo.ReteooWorkingMemory.doInsert( ReteooWorkingMemory.java:70) at org.drools.common.AbstractWorkingMemory.insert( AbstractWorkingMemory.java:772) at org.drools.common.AbstractWorkingMemory.insert ( AbstractWorkingMemory.java:584) at com.sample.DroolsTest.main(DroolsTest.java:42) Has anyone successfully used JDK based dynamic proxies as facts? Thanks, -Chris West ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] how to create local variable
It is not possible to assign the result of an arbitrary method call to a variable right now. So, your best option is probably to do (please note the use of inline-eval): *rule* SupplierView: Headquarter Supplier Code should end on 25 or 30. *when* $cs : SupplierView(corporate == *true,* eval( suppCode.substring(4, 6).equals( 25 ) || suppCode.substring(4, 6).equals( 30 ) ) ) *then* ValidationErrorFacade.getInstance().registerError($cs, *new*ValidationError(Headquarter Supplier Code should end on 25 or 30.)); *end* A more clean solution is to use matches operator. If your rule states that Supplier Code must END with 25 or 30, you can do: *rule* SupplierView: Headquarter Supplier Code should end on 25 or 30. *when* $cs : SupplierView(corporate == *true,* suppCode matches .*25 || matches .*30 ) *then* ValidationErrorFacade.getInstance().registerError($cs, *new*ValidationError(Headquarter Supplier Code should end on 25 or 30.)); *end* Hope it helps. []s Edson 2007/7/12, Manukyan, Sergey [EMAIL PROTECTED]: Folks, I have a rule where I am repeating part of it twice : ($cs.getSuppCode().substring(4, 6)), and I would like to replace it with variable… how can I do that? The solution with in doesn't worl because it is a java code needed to perform calculations for variable….. Please see the rule below: * * *rule* SupplierView: Headquarter Supplier Code should end on 25 or 30. *when* $cs : SupplierView(corporate == *true*) *eval*($cs.getSuppCode().substring(4, 6) == 25 || $cs.getSuppCode().substring(4, 6) == 30) *then* ValidationErrorFacade.getInstance().registerError($cs, *new*ValidationError(Headquarter Supplier Code should end on 25 or 30.)); *end* Thanks, -Sergey ** ** LEGAL DISCLAIMER ** ** This E-mail message and any attachments may contain legally privileged, confidential or proprietary information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this E-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this E-mail message from your computer. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Re: Using JDK dynamic proxies as facts
Please!
Thank you for providing the solution.
[]s
Edson
2007/7/12, Chris West [EMAIL PROTECTED]:
OK, I just solved my own problem. My proxy had no package, since the jdk
based proxy is only in a package if it has at least 1 non public interface,
according to the javadoc.
The suspect code beginning on line 333 is:
String pkgName = cls.getPackage().getName();
if ( org.drools.reteoo.equals( pkgName ) ||
org.drools.base.equals(
pkgName ) ) {
// We don't shadow internal classes
this.shadowEnabled = false;
return;
}
The getPackage() method returns null. In this case, it would be good if
JBoss Rules handled the null and went on to shadow the object anyway, since
it is obviously not in the org.drools packages.
Now I'll continue trying to build a test case for my original problem.
Shall I enter a JIRA for this issue?
Thanks,
-Chris West
On 7/12/07, Chris West [EMAIL PROTECTED] wrote:
Hello,
I'm trying to use objects that are generated as dynamic proxies (through
the java.lang.reflect.Proxy class) as facts in JBoss Rules 4.0 MR3. My
project was using CGLib to generate proxies, and they were working just fine
in 3.0.6. However, when I tried 4.0, the CGLib based proxies seemed to
have a final method that kept the proxies from being proxied as shadow
facts. So I rewrote my code to try to use JDK based proxies, and version
4.0 MR3 accepts them and apparently creates shadow facts, but now my
rules don't fire correctly.
So, in an attempt to create a simple program to illustrate the problem,
I ran into a different problem. The attached eclipse project illustrates
this problem.
The error is:
java.lang.NullPointerException
at org.drools.reteoo.Rete$ObjectTypeConf.init(Rete.java:333)
at org.drools.reteoo.Rete.assertObject(Rete.java:152)
at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java
:190)
at org.drools.reteoo.ReteooWorkingMemory.doInsert(
ReteooWorkingMemory.java:70)
at org.drools.common.AbstractWorkingMemory.insert(
AbstractWorkingMemory.java:772)
at org.drools.common.AbstractWorkingMemory.insert (
AbstractWorkingMemory.java:584)
at com.sample.DroolsTest.main(DroolsTest.java:42)
Has anyone successfully used JDK based dynamic proxies as facts?
Thanks,
-Chris West
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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RE: [rules-users] how to create local variable
Thank you Edson, I liked the solution with matches, it is much cleaner -Sergey From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Edson Tirelli Sent: Thursday, July 12, 2007 4:19 PM To: Rules Users List Subject: Re: [rules-users] how to create local variable It is not possible to assign the result of an arbitrary method call to a variable right now. So, your best option is probably to do (please note the use of inline-eval): rule SupplierView: Headquarter Supplier Code should end on 25 or 30. when $cs : SupplierView(corporate == true, eval( suppCode.substring(4, 6).equals( 25 ) || suppCode.substring(4, 6).equals( 30 ) ) ) then ValidationErrorFacade.getInstance().registerError($cs, new ValidationError(Headquarter Supplier Code should end on 25 or 30.)); end A more clean solution is to use matches operator. If your rule states that Supplier Code must END with 25 or 30, you can do: rule SupplierView: Headquarter Supplier Code should end on 25 or 30. when $cs : SupplierView(corporate == true, suppCode matches .*25 || matches .*30 ) then ValidationErrorFacade.getInstance().registerError($cs, new ValidationError(Headquarter Supplier Code should end on 25 or 30.)); end Hope it helps. []s Edson 2007/7/12, Manukyan, Sergey [EMAIL PROTECTED]: Folks, I have a rule where I am repeating part of it twice : ($cs.getSuppCode().substring(4, 6)), and I would like to replace it with variable... how can I do that? The solution with in doesn't worl because it is a java code needed to perform calculations for variable. Please see the rule below: rule SupplierView: Headquarter Supplier Code should end on 25 or 30. when $cs : SupplierView(corporate == true) eval($cs.getSuppCode().substring(4, 6) == 25 || $cs.getSuppCode().substring(4, 6) == 30) then ValidationErrorFacade.getInstance().registerError($cs, new ValidationError(Headquarter Supplier Code should end on 25 or 30.)); end Thanks, -Sergey ** ** LEGAL DISCLAIMER ** ** This E-mail message and any attachments may contain legally privileged, confidential or proprietary information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this E-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this E-mail message from your computer. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Compilation Error in Drools
Hi All,
I used the following code in the dsl file.
DSL:
[when] Check whether the name is present as {studName} = $stud :
Student(name = {studName});
[then] Set the Error Code {errorCode} = String string = $stud.getName();
Error(errorCode, string);
DRL:
package com.policy;
expander StudendProgram.dsl;
import java.util.Iterator;
import com.class.Student;
import com.class.Error;
rule StudendProgram_1
when
Check whether the name is present as Stephen
then
Set the Error Code 88
end
When I try to run this program I got the following error.
Caused by: org.drools.rule.InvalidRulePackage: Rule Compilation error
File com/policy/Rule_SpeCodeSpeValProdPlan12_0.java, Line 12, Column 176:
Unexpected token . in primary
When I remove the Line $stud.getName(); in the then part and set the error
code alone its working fine. The . inbetween $stud and getName() may be
the problem. But I don't know the solution for this.
Any suggessions on this.
Thanks,
McShiv
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Re: [rules-users] Complex validation logic for hierarchies with Drools
Oleg, As I mentioned to you, it is perfectly fine and easy to use the rules engine to validate your object tree as long as you instruct your users that they must write structured rules. What I mean is: as much as DSL templates allow you to write rules that resemble natural language, it is not really natural language. The main advice is to group objects and attributes together. So, instead of writing the rule as: 3. ServiceDescription contained inside ClientService with type BRONZE should has status ACCEPTED They need to write the rule as: 3. If there is a ClientService whose type is BRONZE and a ServiceDescription contained inside it whose status is different of ACCEPTED then report error As you can see, all the constraints/attributes are listed right after each object type. The above rule can be translated to: rule 3. Validate status for BRONZE when There is a ClientService - whose type is BRONZE There is a ServiceDescription - contained inside it - whose status is different of ACCEPTED then report error end As you can see, the rule definition is very close to the actual rule, if you take the appropriate care when writing it, having the attribute/constraints right after each object type. Now, the DSL mapping will transform the above rule into: rule 3. Validate status for BRONZE when cs : ClientService( type == BRONZE ) sd : ServiceDescription( this memberOf cs.children, status != ACCEPTED ) then # report error end When you try to extrapolate the above example to your real business example, to make your DSL template completely generic, you may find the need to explain to your users the concept of variable though. So, what he would do is actually name each of your objects. Example (replace X and Y for any identifier that makes sense for the user): 3. If there is a ClientService named X whose type is BRONZE and a ServiceDescription name Y contained inside X whose status is different of ACCEPTED then report error If the user names each object, it will be much easier to write generic templates, since your rule would become: rule 3. Validate status for BRONZE when There is a ClientService named X - whose type is BRONZE There is a ServiceDescription named Y - contained inside X - whose status is different of ACCEPTED then report error end And the DSL would translate that to: rule 3. Validate status for BRONZE when X : ClientService( type == BRONZE ) Y : ServiceDescription( this memberOf X.children, status != ACCEPTED ) then # report error end I don't think that it is too hard to explain to users that they need to name each of his objects and this adds a great flexibility to the rules when adding constraints between objects of the same type. The final (and hardest) problem you will face is that you mentioned that your objects may be any level deep inside each other and you want to abstract that from users. In this case I see only 2 options: 1. The first option is do what you are already doing and create a helper function that goes deep a hierarchy checking for the existence of the relationship. 2. The second option is to create a relationship object that will flatten your tree structure transforming it in a pure relational structure. This is a very common solution used in databases that do not support hierarchy queries. The idea is that you create an object with attributes parent, child and optionally the level (distance) between each other, and you assert a copy of it for each related object in your object hierarchy (in computational theory we call this set of objects the result of the transitive closure calculation). The result is really a trade-off between memory and query time. You need to check if for your use case, the performance gains and expressiveness flexibility pays off the memory cost. Hope it helps. []s Edson 2007/7/12, Oleg Yavorsky [EMAIL PROTECTED]: Hi. I've got a lot of domain objects represented as instances of classes generated from XSD using Castor. My goal is to implement validation framework for whole tree which contains complex when conditions (see bellow). Furthermore, rules definitions should be very easy for unexperienced user to change so I need DSL. Now I use reflection to assert whole tree of objects to working memory along with additional context information (like stack of parents associated with particular object). Then I use eval() in LHS to call boolean functions which performs checks in plain Java to see if object in particular context. But I think that this is ugly approach and it doesn't solve other cases. I'm new to Drools but something tells me that it can give me more elegant solution for such problems. Here is an example of possible hierarchy (used XSD to better represent it). Make note that in production case similar hierarchy is more complex and has a lot of objects. Sorry, but I don't know how to format it in email. ?xml version=1.0 encoding=UTF-8? schema
Re: [rules-users] Compilation Error in Drools
Best way to investigate this is to expand your DSL to the DRL to check
how the expansion is working.
DrlParser parser = new DrlParser();
String expanded = parser.getExpandedDRL( drlSourceString, dslReader
);
Check what is wrong in the expanded DRL. I see your map has an error:
$stud : Student(name == {studName})
The comparison must be made with '==' as above instead of '=' as in your
template. But I don't know if that is the only problem.
[]s
Edson
2007/7/12, McShiv [EMAIL PROTECTED]:
Hi All,
I used the following code in the dsl file.
DSL:
[when] Check whether the name is present as {studName} = $stud :
Student(name = {studName});
[then] Set the Error Code {errorCode} = String string =
$stud.getName();
Error(errorCode, string);
DRL:
package com.policy;
expander StudendProgram.dsl;
import java.util.Iterator;
import com.class.Student;
import com.class.Error;
rule StudendProgram_1
when
Check whether the name is present as Stephen
then
Set the Error Code 88
end
When I try to run this program I got the following error.
Caused by: org.drools.rule.InvalidRulePackage: Rule Compilation error
File com/policy/Rule_SpeCodeSpeValProdPlan12_0.java, Line 12, Column 176:
Unexpected token . in primary
When I remove the Line $stud.getName(); in the then part and set the
error
code alone its working fine. The . inbetween $stud and getName() may be
the problem. But I don't know the solution for this.
Any suggessions on this.
Thanks,
McShiv
--
View this message in context:
http://www.nabble.com/Compilation-Error-in-Drools-tf4071029.html#a11569413
Sent from the drools - user mailing list archive at Nabble.com.
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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[rules-users] Problem opening several views in 4.0 MR3 Eclipse
When I attempt to open several views (Working Memory, Agenda, Global, etc) within an JBoss Rules enabled Eclipse, I receive the following error: java.lang.NoClassDefFoundError: org/eclipse/debug/internal/ui/contexts/provisional/IDebugContextListener at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:161) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:501) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:471) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:430) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:413) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189) at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:408) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:161) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:501) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:471) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:430) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:413) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189) at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:408) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:289) at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227) at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1269) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:788) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51) at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:235) at org.eclipse.ui.internal.registry.ViewDescriptor.createView(ViewDescriptor.java:69) at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:327) at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:227) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592) at org.eclipse.ui.internal.Perspective.showView(Perspective.java:2077) at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1018) at org.eclipse.ui.internal.WorkbenchPage.access $18(WorkbenchPage.java:999) at org.eclipse.ui.internal.WorkbenchPage $19.run(WorkbenchPage.java:3666) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3663) at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3639) at org.eclipse.ui.handlers.ShowViewHandler.openView(ShowViewHandler.java:165) at
