July 2011 - rules-users - Jboss List Archives

Temporal rule doesn't fire in STREAM mode

by Melton, Michael P CTR SPAWARSYSCEN-ATLANTIC, 01200

Hello, I have been fighting with this issue for several days, and I just stumbled upon the reason why, but that raised another question for me. I have a rule checking that two events of the same type do not occur in succession without an event of a specific other type in between them: # If two WorkerInWorkEvents exist for a worker, there must be a WorkerOutOfWorkEvent between them rule "ERROR: Consecutive WorkerInWorkEvents" when $w1 : WorkerInWorkEvent( $workerId : workerId ) $w2 : WorkerInWorkEvent( workerId == $workerId, this after $w1 ) not WorkerOutOfWorkEvent( workerId == $workerId, this after $w1, this before $w2 ) then errors.add("Two WorkerInWorkEvents without a WorkerOutOfWorkEvent in between (" + $w2 + ")"); retract( $w2 ); end I could see via the log that this file was activating, however it was never firing. The retraction of $w2 should have cancelled other rules' activations, but it wasn't doing so because this rule was never firing. I just discovered a thread (http://drools.46999.n3.nabble.com/Drools-fusion-and-absence-of-events-td5...) which finally explained to me the reason why: I was running in STREAM mode, and the engine was waiting to see if a WorkerOutOfWorkEvent timestamped between the two WorkerInWorkEvents was going to show up. When I switched to CLOUD mode, the rule fired as expected and my other activations were cancelled as I expected. Now, my new question is: Since I have not specified any intervals, how long will the engine wait for the WorkerOutOfWorkEvent to show up? Forever? Thanks in advance for any light you can shed on this. Mike

14 years, 8 months

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Eclipse Java compliance

by gab

Hi, I'm new to Drools. I searched on the topics but I couldn't find anything useful. ----------- My environment is Windows 7 64bit Java 1.6 jdk Eclipse SDK 3.6 JBoss Tools 3.2.0 with latest drools plugin. Drools 5.2 runtime ------------ When I try to create a new Drools Project from eclipse ide, I get the following error for each rule file: test/rule/Rule_A_stand_alone_rule_0DefaultConsequenceInvoker : unsupported classversion 50.0 If I change java compiler compliance to 1.5 I get rid of errors, but because of project policy I can't set 1.5 compliance level. What could be wrong in my ide or project config?? Thanks in advance, Gab -- View this message in context: http://drools.46999.n3.nabble.com/Eclipse-Java-compliance-tp3191021p31910... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 8 months

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Editing Changeset xml file by Guvnor 5.1

by DroolersEye

Hi, I am trying to connect changeset xml file located in the remote Guvnor 5.1 running in WAS7 server in a solaris box. When I try to integrate the Guvnor using the KnowledgeAgent+Changeset but it fails to read the changeset xml. It throws parser exception and 401 exception. Remote Guvnor authentication enabled(using LDAP), I can successfully log in to Guvnor and create or edit rules files but in run time throws this error... "Kagent.addChangeset("remote_location_of_the_changeset_file_url")". 1. Is it possible to edit the changeset xml file by Guvnor like other assets (to add the authentication details)? 2. It is not good idea to reveal the user id and password to hard code in the src level (Guvnor can manage like RDBMS connection in 5.2 version)? 3. The above 2 questions not having immediate solution, what is the suggestion? best regards, ----- with kind regards, -- View this message in context: http://drools.46999.n3.nabble.com/Editing-Changeset-xml-file-by-Guvnor-5-... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 8 months

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drools-server empty response body

by lhorton

I am new to calling Rest services and using drools-server. I configured the camel-server.xml and knowledge-services.xml rest service to use xstream marshalling, added my rules and pojo model to the war, and deployed it on tomcat. I wrote a java http client to run the rest service. This is the batch command that I'm sending: <set-global identifier="logger"> <org.apache.commons.logging.impl.Log4JLogger> <name>com.abclegal.rules.integration.StatusChangeTestIntegration</name> </org.apache.commons.logging.impl.Log4JLogger> </set-global> <insert> <com.abclegal.domain.step.VenueValidationStep> <id>0</id> <parentTaskId>0</parentTaskId> <status>PENDING</status> <activatable>false</activatable> <abortable>false</abortable> <completable>false</completable> </com.abclegal.domain.step.VenueValidationStep> </insert> <fire-all-rules/> </batch-execution> this is the rule: rule "Activate VenueValidationStep" dialect "mvel" when $step : VenueValidationStep(activatable == false, status == Status.PENDING) then logger.debug("activating VenueValidationStep"); modify($step) { setActivatable(true), setStatus(Status.ACTIVE); }; return($step); end when I run the client, I can see on the server log that the global was set and the correct rule is running (it writes to the log using the global logger), and i get a 200 response on the http post. However, the response body is empty except for the enclosing xml tags. it contains only: <?xml version='1.0' encoding='UTF-8'?><execution-results/> The behaviour I would like to happen is that the modified $step would be returned from the http post. Apologies if this is another dumb noob question - I hope it's just something simple I've missed. thanks for the help. -- View this message in context: http://drools.46999.n3.nabble.com/drools-server-empty-response-body-tp319... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 8 months

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order of injected events

by Chris Richmond

I am running a simple test like so: package com.sample; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseFactory; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderError; import org.drools.builder.KnowledgeBuilderErrors; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.builder.ResourceType; import org.drools.io.ResourceFactory; import org.drools.logger.KnowledgeRuntimeLogger; import org.drools.logger.KnowledgeRuntimeLoggerFactory; import org.drools.runtime.KnowledgeSessionConfiguration; import org.drools.runtime.StatefulKnowledgeSession; import org.drools.runtime.conf.ClockTypeOption; import org.drools.runtime.rule.WorkingMemoryEntryPoint; import com.sample.DroolsTest.Message; public class FusionMain { public static final void main(String[] args) { try { KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(); config.setOption( ClockTypeOption.get("realtime") ); KnowledgeBase kbase; kbase = readKnowledgeBase(); final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); WorkingMemoryEntryPoint myStream = ksession.getWorkingMemoryEntryPoint("My Stream"); Thread t = new Thread(new Runnable(){ @Override public void run() { ksession.fireUntilHalt(); } }); t.start(); for (float x = 0.0f; x < 20.0f; x++){ DataReading dr = new DataReading("Reading " + x, x); myStream.insert(dr); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), ResourceType.DRL); 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()); return kbase; } } With the following rule in the sample.drl file: package com.sample import com.sample.DroolsTest.Message; import java.util.Date; declare DataReading @role( event ) end rule "MyGuidedRule" dialect "mvel" when $dr: DataReading( reading > "10.0" ) from entry-point "My Stream" then System.err.println("Reading: " + $dr.name + " > 10.0 " + System.currentTimeMillis()); end know I am running fireUntilHalt on a seperate thread as you can see, but events injected fire rules out of order...in fact almost the exact opposite order in which they were inserted to the stream every time: Reading: Reading 19.0 > 10.0 1311325346490 Reading: Reading 18.0 > 10.0 1311325346491 Reading: Reading 17.0 > 10.0 1311325346491 Reading: Reading 16.0 > 10.0 1311325346491 Reading: Reading 15.0 > 10.0 1311325346491 Reading: Reading 14.0 > 10.0 1311325346491 Reading: Reading 13.0 > 10.0 1311325346491 Reading: Reading 12.0 > 10.0 1311325346491 Reading: Reading 11.0 > 10.0 1311325346491 I want to eventually perform temporal reasoning, but how can I expect that to work if events are not evaluated in the order they were inserted. Perhaps I am setting up my session/kb improperly? Thanks, Chris

14 years, 8 months

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how to invoke rest service on drools server with serialized objects

by Lisa Horton

I installed drools-server (5.2 final) in tomcat and was able to invoke the sample Soap service using SoapUI using Salaboy's excellent blog post instructions. I have modified knowledge-services.xml to add my rule base using a knowledge agent, and changed camel-server.xml to marshal/unmarshal using serialization. The drools-server starts up without error, but when I try to call the rest service from my java client, I get HTTP response: status code = 415, status message = [Unsupported Media Type]. Any suggestions or example of how to do this? I am attaching my xml files. the application-Context-rulesTestIntegrationExamples.xml is the spring bean definition for my client java program.

14 years, 8 months

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Dynamic facts

by Marc Heinz

Hello everyone, I need some enlightening about Drools "dynamic facts" (a term used in the documentation, for facts that could be updated from outside the rule engine). The current documentation always list the "insert" method of a StatefulKnowledgeSession being able to take an additional boolean argument, stating that the corresponding fact supports the PropertyChangeSupport related methods. However, it seems that this method do not exists anymore for already some time now... After googling for a while it appears that some possible workaround were modifyInsert (apparently removed from the API as well) and the @propertyChangeSupport meta-data annotation, but I didn't manage to make it work (actually I wasn't able to find any reference from it in the API, so I guess that it is also not available anymore). So, this left us with the "session.update" method. Which seems to works great, except that it will invalidate the whole fact into the working memory, even if only some of the fields were changed. Is this some current limitation of Drools? Does it have something to do with those "Shadows Fact"? (that would be somehow immutable?) If we effectively can't fire update targeted to some specific fields, this has probably some big implications on performances (even for simple fact with only a few fields). It would also means that one should always aim at the finest granularity for better performances, by somehow "flattening" the object structure into the knowledge base (which in turn could make complicated to reuse those same Pojo in other frameworks, such as hibernate). Did I miss something? Any feedback deeply appreciated, Thanks! M. H.

14 years, 8 months

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Re: [rules-users] How to reuse a result of a rule in an other rule

by Sachin Thapa

Most important thing, the attributes of result object must satisfy the firing condition of rule in which you want to use the result. http://technologistics.blogspot.com/ -- View this message in context: http://drools.46999.n3.nabble.com/How-to-reuse-a-result-of-a-rule-in-an-o... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 8 months

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Problem with Guvnor 5.1.1, <save> frequently does not save...

by David Shields

I have spent several days writing rules and tests for them in Guvnor, and kept having strange results. A test would sometimes fail, repeatedly, and then finally start working after I would delete and recreate some portion of it, or change a value. After two of us spent many hours trying to identify the extent of the problem, we concluded the following: 1. The problem happens under both IE and Firefox. 2. The problem happens less frequently under Firefox if we install and turn on a third-party plug-in which disables Firefox caching web pages. 3. Saving a new rule or test will allow us to work with it (edit - save - test scenarios). However, frequently the rule or test will just disappear once we log out. 4. A "Save" and "Check-in" will often work correctly if we cross our fingers and do the following: a. Save it once (the screen updates, and you can check the version history) b. Refresh the browser c. Make the change again d. Save it a second time 5. After doing a "Save" and "Check-in", you can immediately do a "view source" and see your changes in place. However, if you then close the test (or rule) and re-open it, you will often find that the change is gone, and the test or rule looks like it did before you made the change. A sample screenshot appears below. In this case, I created the test with the "performedTime" set to 20-Sep-2008. I ran the test and it failed, because the rule was checking for greater than or equal to 21-Sep-2008. I then changed the date on the test to 21-Sep-2008, did a "save changes" and a "Check-in", and then ran the scenario again. As you can see below, the asserted object contains the date 20-Sep-2008, even though the test clearly shows 21-Sep-2008. Does anybody have any ideas on this? If I copy the above test into a new test, it will often work the first time, but then it may disappear, once I logout, even though it was saved and checked-in. It almost seems like there is something wrong with the imbedded repository, and / or the first running of the test created fact objects that are persisting and being found the second time I ran the changed test. ... We are running the Final release of Drools Guvnor 5.1.1 found in drools-5.1.1-guvnor.zip downloaded on 4-Sep-2010 We are running under Tomcat 6.0, with the recommended jar files replaced. Thanks for your help! -------------------------------------------------- David Shields Division of Clinical Informatics Department of Community and Family Medicine Duke University Medical Center Phone (864) 787-8551

14 years, 8 months

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How to write rules with optional parts?

by Edward Johnson

How do you do rules that are a sequence of events where some of them are optional? Example: Alert if DAVID enters a room after ALICE or after ALICE and BOB If it were a string, this is roughly equivalant to the regex /ALICE( BOB)? DAVID/ So: Alice then David => alert Alice then Bob then David => alert Alice then Charles then David => no alert I could write this as two rules but as the rules get more complex it could by hard to manage the resulting combatorial explosion. Here it is as two rules: Rule 1: $p1:person (name=="Alice") $p2:person (name=="David", this after[0,1] $p1) Rule 2: $p1:person (name=="Alice") $p2:person (name=="Bob", this after[0,1] $p1) $p3:person (name=="David", this after[0,1] $p2)

14 years, 8 months

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rules-users July 2011