Question about drools-spring in a multi-treaded container (like tomcat).
by Gurvinder Narula1
Hello all,
I've been reading up about drool-spring integration and have put together a simple project that wires together a KnowledgeBase and KnowledgeSession as follows :
<drools:resource id="GroupUnit" type="DRL"
source="file:/Users/drools/drools-spring-test/src/Rules/drls/GroupUnit.drl" />
<drools:resource id="GradeUnit" type="DRL"
source="file:/Users/drools/drools-spring-test/src/Rules/drls/GradeUnit.drl"" />
<drools:resource id="EvaluateUnit" type="DRL"
source="file:/Users/drools/drools-spring-test/src/Rules/drls/EvaluateUnit.drl"" />
<drools:grid-node id="node1" />
<drools:kbase id="kbase1" node="node1">
<drools:resources>
<drools:resource ref="GroupUnit" />
<drools:resource ref="GradeUnit" />
<drools:resource ref="EvaluateUnit" />
</drools:resources>
</drools:kbase>
<drools:ksession id="ksession" type="stateful" kbase="kbase1"
node="node1" />
Then in my Controller call, I 'AutoWire' in the StatefulKnowledgeSession as follows :
@Controller
@RequestMapping( value = "foo" )
final class FooController{
@Autowired
StatefulKnowledgeSession ksession;
@RequestMapping( method = RequestMethod.GET )
@ResponseBody
public String evaluateUnit() {
Unit unit = new Unit("030", "502", "C", "9484", "45", new String[] {},
null);
if (ksession != null) {
ksession.fireAllRules();
ksession.insert(unit);
ksession.fireAllRules();
return "<UnitCategory>" + unit.getUnitCategory() + "</UnitCategory>";
}
else
return "<message> stateful session is null</message>";
}
The main question that I have is that – is this solution thread-safe ? From what I understand of spring is that beans configured without any additional qualifiers are inherently singletons. And when deployed in a multi-theaded container like tomcat, Spring assumes that the beans being severed up a thread-safe. So from I have read is that KnowledeSessions are inherently not thread safe. So putting the 2 together, I leaning towards the assessment that this above solution is NOT thread safe and that if I do want it to be thread safe I should set the StatefulKnowledgeSession to 'prototype' and not leave it as a singleton.
Please let me know if I'm missing anything in my assessment here !
Thanks in advance,
Gurvinder
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13 years, 4 months
Compiled rules differ KnowledgeAgent vs ResourceChangeScanner
by lhorton
Version 5.2.0.Final. I have a DRL file that is loaded into my server using a
change set and Spring configuration. The file loads without error, and I am
able to read the compiled package and print the rule names to confirm they
did load; however, only one of the rules fires. Then I copy (hot-deploy)
the same DRL file to its server-side directory, and the Resource change
Scanner picks it up and reloads it. After reload, all the expected rules
execute.
My guess is that the Spring/KnowledgeAgent compilation is different than the
one done via the resource change scanner. Has anyone else seen this
behavior? Any suggestions for further trouble shooting?
I can attach the change set, spring config and drl file if needed.
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13 years, 4 months
Unmarshall large session fails
by Magnus Vojbacke
I'm trying to unmarshal a knowledge session that has been persisted to file, but I get the following exception:
Stack Trace:
com.google.protobuf.InvalidProtocolBufferException: Protocol message was too large. May be malicious. Use CodedInputStream.setSizeLimit() to increase the size limit.
at com.google.protobuf.InvalidProtocolBufferException.sizeLimitExceeded:89
at com.google.protobuf.CodedInputStream.refillBuffer:720
at com.google.protobuf.CodedInputStream.isAtEnd:666
at com.google.protobuf.CodedInputStream.readTag:99
at org.drools.marshalling.impl.ProtobufMessages$Header$Builder.mergeFrom:967
at org.drools.marshalling.impl.ProtobufMessages$Header$Builder.mergeFrom:773
at com.google.protobuf.AbstractMessageLite$Builder.mergeFrom:212
at com.google.protobuf.AbstractMessage$Builder.mergeFrom:746
at org.drools.marshalling.impl.ProtobufMessages$Header.parseFrom:724
at org.drools.marshalling.impl.PersisterHelper.readFromStreamWithHeader:234
at org.drools.marshalling.impl.ProtobufInputMarshaller.loadAndParseSession:217
at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession:107
at org.drools.marshalling.impl.ProtobufMarshaller.unmarshall:143
The session consists of >1M facts, and the file is ~167 MB in size.
While Googling, I stumbled upon the recommendation to run CodedInputStream.resetSizeCounter() inbetween deserializing messages. Is this a fix that could be implemented in Drools?
Is there any way of configuring or parameterizing the unmarshalling size limit used by Drools?
13 years, 5 months
continuous integration of rule assets via jenkins to guvnor?
by Cedric Hurst
I'd like to get a quick sanity check on best practices...
I'm working on a project where, by policy, all assets (including drl's, bpmn
files, etc) must be built, tested and packaged by a Jenkins server. Rule
assets are structured within a project that also includes non-rule assets.
As is quite common, the primary system of record for these assets is an SCM
like svn or git, and that's what our Jenkins box talks to.
However, for the rule stuff specifically, we're also using Guvnor's
drools-repository to package the assets into a knowledge base, which is
referenced jBPM's process engine in the runtime. The plan is to have
several Guvnor environments running with parity to development, QA, UAT and
production setups. However, we're having a very hard time figuring out how
best to sync our rule assets to these various repositories as part of an
automated release.
To the best of my understanding, rule assets are deployed to a Guvnor
instance file-by-file via WebDAV. One can also upload JARs for POJOs, but
DRLs, BPMN, DSL files need to be synced individually. Is this the case?
And, if so, how do other groups handle continuous integration and deployment
of assets coming from external SCMs?
Btw, I came across aware of a Maven plugin which seems to do this sort of
piece-by-piece deployment:
https://github.com/awaterma/drools-guvnor-plugin
So we could certainly port this sort of functionality to our own build
toolchain, but it seems like a lot of work so I'm hoping for a better way.
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13 years, 5 months
Drools Clips
by Grant Rettke
Hi,
Anyone using or have used Drools Clips before? If so, what is your
opinion of it? If not, why not?
I'm pretty curious about it and wanted to start here before pinging
the dev list on who is maintaining it (nor not).
Best wishes,
--
Grant Rettke | ACM, AMA, COG, IEEE
grettke(a)acm.org | http://www.wisdomandwonder.com/
Wisdom begins in wonder.
((λ (x) (x x)) (λ (x) (x x)))
13 years, 5 months
Is it posibble to keep two date formats in drools like 'dd-MMM-yyyy' and 'dd-MMM-yyyy HH:mm'
by richie
Hi,
The default date format in drools is 'dd-MMM-yyyy', but in the definition of
rule attribute date-effective, it says it contain a date and time
definition, so if I set date-effective to "30-Jan-2013 08:00", then the time
set in date-effective will be ignored, so I changed the date format to
'dd-MMM-yyyy HH:mm', now the effective date works correctly, but then we got
problem here, if user input a date like "30-Jan-2013" the drools will failed
to execute, so must force user to input a date like this "30-Jan-2013
00:00", this is not user friendly and the string "00:00" is meaningless.
What I want to know is, if it's possible to keep this two formats both?
Thanks.
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13 years, 5 months
Non short circuit ANDing
by mp
Hi,
I need to use non-short circuit ANDing (&) for my rules.
However, for a rules like (conditionA & conditionB) I get the following
error:
"Predicate 'conditionA & conditionB' must be a Boolean expression"
(conditionA && conditionB) works fine. But it short circuits the conditions.
Any ideas as to what I could be doing wrong or how I can ensure that
condition2 is evaluated irrespective of whether condition1 is true or false?
Thanks.
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13 years, 5 months
ClassCastException and "from collect" keyword issue?
by Tan, Kevin
Hi rules users,
I am having a problem with Drools 5.1.1 recently. The exception we had is:
java.lang.ClassCastException:
d2.rules.state.EvaluateRule cannot be cast to d2.autorating.data.model.Account
org.drools.runtime.rule.ConsequenceException: rule: DERIVE_COLLAT_MECHANISM_PLEDGE
Our rules are listed as below:
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
rule "DERIVE_COLLAT_MECHANISM_PLEDGE"
no-loop true
salience 19991
when
$RatingData : RatingRuleFact()
$contract : Contract()
$csaDoc : Document(documentId == $contract.csaId && status == "Final/Signed")
(EvaluateRule(ruleName == "INSCOPE))
then
RuleProcessingOutput ruleOutput = $RatingData.getRuleOutput();
RuleResult result = new RuleResult(drools.getRule().getName(), $contract.getContractId(), $RatingData.getPrincipalPartyCountry());
ruleOutput.addRuleResult(result);
$contract.setCollateralMechanism(result.getRuleOutputText());
insertLogical(new EvaluateRule(drools.getRule().getName()));
end
rule "EXC_COLLAT_HOLDING_ARRANGEMENT"
no-loop true
salience 19985
when
$RatingData : RatingRuleFact()
$contract : Contract()
$noHoldingAgreementAccts : ArrayList()
from collect ( Account(collatNetId == $contract.contractId,
businessUnit not in ("COMM", "FID", "FX", "IED", "SECLENDING", "SWAPS")) from $contract.collatAccounts
)
EvaluateRule(ruleName == "INSCOPE")
then
RuleProcessingOutput ruleOutput = $RatingData.getRuleOutput();
for (Object obj : $noHoldingAgreementAccts) {
Account acct = (Account) obj;
if (acct.getDp2Account() != null) {
RuleResult result = new RuleResult(drools.getRule().getName(), $contract.getContractId(), $RatingData.getPrincipalPartyCountry());
result.setAccountId(acct.getDp2Account().getAccountId());
result.setRuleOutputText("BU has no Data");
ruleOutput.addRuleResult(result);
}
}
if ($noHoldingAgreementAccts.size() > 0) {
insertLogical(new EvaluateRule(drools.getRule().getName()));
}
end
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
* In object Account(), we did not have any EvaluateRule() object in it.
* We also noticed after the "from collect" key word there are EvaluateRule() object defined after it(but the purpose is just to determine if this object exist or not in the Working Memory), in the LHS of each rule file.
* In the variable $noHoldingAgreementAccts, we are not supposed to see the object - EvaluateRule (BUT the exception is showing it is trying to cast EvaluateRule into Account)
My question is are there any known problems/issues with the following
- Drools rule compilers
- Key word from collect
- Rules production memory
- Version 5.1.1
that can make this happen? Any ideas will be appreciated. Thanks.
Kevin Tan
Morgan Stanley | Enterprise Data & Services
700 Rue Wellington | Floor 04
Montreal, QC H3C 3S4
Phone: +1 514 876-5756
Kevin.Tan(a)morganstanley.com<mailto:Thanh.Dang@morganstanley.com>
________________________________
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13 years, 5 months
User specific packages for Guvnor
by riri
Hello everyone,
I am interested in working with Guvnor and would like to know if rule
packages can be user specific. For example I would need to have each user be
able to have his own rules to work on and have only these ones available the
next time he logs in. I think that would be the same as having a separate
knowledge base per user but I am not exactly sure what settings should be
configured so that the user only has access to his knowledge base.
Afterwards I need to recover the user specific packages separately using the
knowledge agent.
Has anyone ever used Guvnor in a similar manner? I am just starting with it
and would appreciate some input from more experienced users.
Best regards
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13 years, 5 months
Evaluator 'matches' does not support type 'ValueType = 'Object'
by CAK
Hello forum,
we currently encounter the following problem on Drools 5.1.1:
Evaluator 'matches' does not support type 'ValueType = 'Object' for the
following rule:
rule "Create_License"
when
StringCapability(name=="service", value=="service_v1")
StringCapability(name=="data.modelCode", value matches "^5G1.*")
then
License license = new License();
license.setDuration("30 years");
license.setName("30Years");
license.setState(State.NOTACTIVATED);
license.setType(Type.IMPLICIT);
license.setWarn(false);
insert(license);
end
StringCapability derives from a generic class and is defined as follows:
public class StringCapability extends Capability <String>
{
public StringCapability(String name, String value)
{
super(name, value);
}
}
whereas the superclass looks like this
public abstract class Capability<T>
{
private final String name;
private final T value;
protected Capability(String name, T value)
{
this.name = name;
this.value = value;
}
@Override
public boolean equals(Object object)
{
if (this == object)
{
return true;
}
if (object == null)
{
return false;
}
if (getClass() != object.getClass())
{
return false;
}
Capability <?> other = (Capability <?>) object;
if (name == null)
{
if (other.name != null)
{
return false;
}
}
else if (!name.equals(other.name))
{
return false;
}
if (value == null)
{
if (other.value != null)
{
return false;
}
}
else if (!value.equals(other.value))
{
return false;
}
return true;
}
public String getName()
{
return name;
}
public T getValue()
{
return value;
}
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result + getClass().hashCode();
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((value == null) ? 0 : value.hashCode());
return result;
}
@Override
public String toString()
{
return new StringBuilder(getClass().getSimpleName()).append(" -
name:").append(name).append(", value:")
.append(String.valueOf(value)).toString();
}
The problem occurs when the rule is supposed to be compiled on
initialization of the knowledge base. So from my point of view, the value
returned by class StringCapability is of type String. Why do I get this
error? How can I workaround this problem without any code change (I just can
provide another rule file)
Any help appreciated!
Thank you,
CAK
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13 years, 5 months
