July 2012 - rules-users - Jboss List Archives

Best practice for using calendar-based rules?

by dunnlow

Hi, I am using drools 5.4 via the web-based server (running in tomcat). My rulebase is stored (and created/maintained) in guvnor. I have a template rule (in guvnor) that I use to define alert conditions. The template has a few columns that allow users to specify several properties of an event on which they would like to be alerted. For example, they can change integer thresholds, set regular expression strings to check against, etc. This has been working well. Now, I want to add a calendar-based aspect to the template rule. So, a user can specify something like, "tell me if an event like this comes in AND it is a weekend." I have considered making a java function or pojo that interprets some string in a template column, which I would then use in the template rule to return true/false. I also considered making a canned set of weekly and daily Quartz calendars so that they could provide a list of calendar names to use. For example "weekendsOnly, offHoursOnly" etc. My question: Have you done anything like this or do you have any thoughts about a clean way to implement it? Is there something simple I am missing? Thanks for any insight, -J -- View this message in context: http://drools.46999.n3.nabble.com/Best-practice-for-using-calendar-based-... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 10 months

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stack shape inconsistent on rule evaluation

by Jörg Herbst

Hi, I've configured a central rule engine which provides dynamic rule evaluation and expose this service as a webservice. Most times everything works fine but sometimes a get a "stack shape inconsistent" exception on a default consequence invoker. (Drools Version is 5.2.3.Final, Java version 5, mvel is 2.1.0.drools16) Any hints? Joerg

11 years, 10 months

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Write Error when Serializing a stateful session to a file.

by chrisLi

Hi, all I am trying to serialize a StatefulKnowledgeSession into a file as a snapshot. But I got the following error: java.io.IOException: Write error at java.io.FileOutputStream.writeBytes(Native Method) at java.io.FileOutputStream.write(FileOutputStream.java:282) at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65) at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123) at java.io.ObjectOutputStream$BlockDataOutputStream.flush(ObjectOutputStream.java:1793) at java.io.ObjectOutputStream.flush(ObjectOutputStream.java:699) at java.io.ObjectOutputStream.close(ObjectOutputStream.java:720) at com.sample.test.EventDataConsumer.run(EventDataConsumer.java:44) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) However, when I serialized it to a ByteArrayOutputStream, it works well. I wrapped the stateful session in a class as a field. And I wrote writeObject and readObject methods in this class to provide custom serializing behaviour. The code is as follows: private void writeObject(ObjectOutputStream out) throws IOException { System.out.println("writing"); out.defaultWriteObject(); DroolsObjectOutputStream droolsOut = new DroolsObjectOutputStream( (OutputStream) out); droolsOut.writeObject(knowledgeBase); Marshaller marshaller = createSerializableMarshaller(knowledgeBase); marshaller.marshall(droolsOut, session); System.out.println("written"); } private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { System.out.println("read"); in.defaultReadObject(); DroolsObjectInputStream droolsIn = new DroolsObjectInputStream( (InputStream) in); this.knowledgeBase = (KnowledgeBase) droolsIn.readObject(); Marshaller marshaller = createSerializableMarshaller(knowledgeBase); session = marshaller.unmarshall(droolsIn); } private Marshaller createSerializableMarshaller(KnowledgeBase knowledgeBase) { ObjectMarshallingStrategyAcceptor acceptor = MarshallerFactory .newClassFilterAcceptor(new String[] { "*.*" }); ObjectMarshallingStrategy strategy = MarshallerFactory .newSerializeMarshallingStrategy(acceptor); Marshaller marshaller = MarshallerFactory.newMarshaller(knowledgeBase, new ObjectMarshallingStrategy[] { strategy }); return marshaller; } Out of this class, I utilized the ordinary ObjectoutputStream to serialize an instance of this class to a file. Unfortunately, I got the Exception. Any idea or response will be appreciated, Thank you very much. -- View this message in context: http://drools.46999.n3.nabble.com/Write-Error-when-Serializing-a-stateful... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 10 months

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comparing strings using ignore case

by abhinay_agarwal

hey, is there a method by which i can compare two string ignoring there case ?? for me writing the code as foo : ObjectTypeA() bar : ObjectTypeB( name.equalsIgnoreCase( foo.name ) ) is a long process because i m comparing the values of string which are present inside a map..and there are loads of comparision.. $h : HashMap(this["Account_Ownership_Type"]=="Single") Does drools have an easier way for ignore case comparision ?? Thanks, Abhinay -- View this message in context: http://drools.46999.n3.nabble.com/comparing-strings-using-ignore-case-tp4... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 10 months

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Re: [rules-users] Write Error when Serializing a stateful session to a

by adeyinka.timi＠nathean.com

I am out of office until Tuesday, 17th of July. If you have any urgent queries, you can contact Robert Doherty at robert.doherty(a)nathean.com 01 6853001

11 years, 10 months

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Re: [rules-users] Migrating from 4.0.7 to 5.4.0.Final

by adeyinka.timi＠nathean.com

I am out of office until Tuesday, 17th of July. If you have any urgent queries, you can contact Robert Doherty at robert.doherty(a)nathean.com 01 6853001

11 years, 10 months

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Migrating from 4.0.7 to 5.4.0.Final

by JP Chemali

Hi all, I'm currently in the process of migrating an application using drools 4.0.7 to 5.4.0.Final and I've stumbled into a few issues with the new version that I find disturbing: - Our unit tests failed because the JVM ran out of perm gen space, which looks odd as in 4.0.7 we've had quite a margin to start with. - Doing several Yourkit analysis, I finally find classloading leaks: * *org.drools.rule.builder.dialect.asm.ClassGenerator.EMPTY_METHOD_BODY* is a static instance which will hold to the last instance of InternalClassLoader created * *org.drools.rule.constraint.MvelConstraint* uses an ExecutorHolder that spawns daemon threads and keeps them in a pool. Problem is these threads create class loaders, and can only be garbage collected when the thread dies, meaning never in my case... - I've quick fixed both issues, the second one by simply disabling the thread pool. - Once this is done, the perm gen behaves correctly, but the execution times are 2-3 times slower on very large set of rules (~1000). Looking at Yourkit analysis again, I see that the number of classes generated and the perm gen consumption is about 3 times higher in 5.4.0.Final. I honestly don't know how to address this. I've tried to find some other posts concerning these issues, to no avail. I don't see any work around this, short of code changes, and for reducing the number of generated classes I simply have no idea. Please correct me if I am wrong, any help would be greatly appreciated -- View this message in context: http://drools.46999.n3.nabble.com/Migrating-from-4-0-7-to-5-4-0-Final-tp4... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 10 months

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Re: [rules-users] comparing strings using ignore case

by adeyinka.timi＠nathean.com

I am out of office until Tuesday, 17th of July. If you have any urgent queries, you can contact Robert Doherty at robert.doherty(a)nathean.com 01 6853001

11 years, 10 months

1
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Re: [rules-users] comparing strings using ignore case

by adeyinka.timi＠nathean.com

I am out of office until Tuesday, 17th of July. If you have any urgent queries, you can contact Robert Doherty at robert.doherty(a)nathean.com 01 6853001

11 years, 10 months

1
0
0 / 0

Re: [rules-users] comparing strings using ignore case

by adeyinka.timi＠nathean.com

I am out of office until Tuesday, 17th of July. If you have any urgent queries, you can contact Robert Doherty at robert.doherty(a)nathean.com 01 6853001

11 years, 10 months

1
0
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rules-users July 2012