February 2007 - rules-users - Jboss List Archives

by Dirk Bergstrom

This horse has been beaten pretty hard (http://thread.gmane.org/gmane.comp.java.drools.user/3557/focus=3585), but I have a newish angle on it. My app has a big collection of business objects (1000 of type X, 10,000 of type Y, 200 of type Z, etc) asserted into a single working memory. These objects need to be updated from external sources periodically. Because each object type has a different source, I'd like to parallelize the updates in separate threads. Some of the updates involve retraction of expired objects or assertion of new ones, but most are just changing fields on already-asserted objects (all fields have PropertyChangeListener (PCL) support). I think that using a SynchronisedWorkingMemory will handle the assert/retract updates. Will it be "happy" in the face of PCL changes as well, or do I need to do something more? -- Dirk Bergstrom dirk(a)juniper.net _____________________________________________ Juniper Networks Inc., Computer Geek Tel: 408.745.3182 Fax: 408.745.8905

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RE: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s

by Olenin, Vladimir (MOH)

Hi, Steve. That might help, though will require one 'external' run over the spreadsheet (ie, open Excel through POI and read some column with rule template names) or a separate config file which matches rules with appropriate templates. Regarding the ExternalSheetListener constructor, is there a way to set the number of records to read? From what I see (the API call), the l1 will process the same data as l2 does (when the compiler will get to row '30') and the data for the second template might not be very applicable for the first template. Basically, the thing is starting from row 30 the data merged with template 1 might generate invalid rules which is not desirable. Any way to avoid it? The main reason such functionality is required in the first place (in our project at least) is that for some use cases the same data can mean slightly different things and should result in slightly different rules. The number of such 'groups' is quite large to split the 'rule data' into separate spreadsheets and the differences between the data interpretation are quite significant for coming up with some 'generic' data format (which could suit all rule 'groups'). There is definitely a bunch of workarounds that can be done, but most of them would require Excel spreadsheet preprocessing. Within the existing API (from the example you attached) Excel preprocessing might be the easiest thing to do. Unless there is some more low level API which allows to insert 'interceptor' which would monitor each record that is being read by compiler and create new listener if appropriate entry is found in the particular column (eg, one column in the spreadsheet might have template name entry which remains the same for all records below unless changed to a new value)..... Smth along those lines :-). Thanks, Steve. Vlad _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Steven Williams Sent: 19 February 2007 18:54 To: Rules Users List Subject: Re: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s Hi Vlad, There is a very basic wiki page on it (http://wiki.jboss.org/wiki/Wiki.jsp?page=DecisionTableTemplates <http://wiki.jboss.org/wiki/Wiki.jsp?page=DecisionTableTemplates> ). In terms of the functionality you mention you have your data having knowledge of the rule templates whereas the current implementation is such that the data has no knowledge of the templates. You can apply multiple rule templates to the same data however (as in ExternalSpreadsheetCompilerIntegrationTest): final ExternalSpreadsheetCompiler converter = new ExternalSpreadsheetCompiler(); final List listeners = new ArrayList(); ExternalSheetListener l1 = new ExternalSheetListener(10, 3, "/templates/test_pricing1.drl"); listeners.add(l1); ExternalSheetListener l2 = new ExternalSheetListener(30, 3, "/templates/test_pricing2.drl"); listeners.add(l2); converter.compile("/data/ExamplePolicyPricing.xls", InputType.XLS, listeners); This example assumes two sets of data in the one sheet, however they could both have been applied to the same set (ie. the second listener could also point to row 10, column 3). Would that accomplish what you need? Steve On 2/20/07, Olenin, Vladimir (MOH) <Vladimir.Olenin(a)moh.gov.on.ca <mailto:Vladimir.Olenin@moh.gov.on.ca> > wrote: Thanks, Steve. That really seems to do the trick. Are there any wiki pages on this new functionality? Or for now one should refer to the source code & unit tests? I also wonder what other functionality the new templating engine has? Is it possible to define different 'types' of rules in the same 'rule' template and refer to these types from 'Excel' data fields (eg, have one column per rule where you can refer 'rule template XXX' from drl file; this value can override some default value for example). If not, how such situations can be handled? (ie, when one needs several type of rules driven by the same data?) Thanks, Vlad _____ From: rules-users-bounces(a)lists.jboss.org <mailto:rules-users-bounces@lists.jboss.org> [mailto:rules-users-bounces@lists.jboss.org <mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of Steven Williams Sent: 17 February 2007 04:25 To: Rules Users List Subject: Re: [rules-users] conditional insert of 'exist' or 'not' keywords in decision table s Hi Vlad, With the new decision table handling you could use the following template to do it: Given a table as follows: exists, 21, 25 , comprehensive not, 64, 100 exists, comprehensive the following template does what you want: template header driver[] policy[] package This_is_a_ruleset; #generated from Decision Table import example.model.Driver; import example.model.Policy ; template "Driver policy" driver policy rule "driver policy $row.rowNumber$" when $driver0$ Driver(age >= $driver1$, age <= $driver2$) $policy0$ Policy(type = "$policy1$") then //do smth end end template the code to call it was: public void testColumnKeywords() { final ExternalSpreadsheetCompiler converter = new ExternalSpreadsheetCompiler(); final String drl = converter.compile( "/data/TestWorkbook.xls", "/templates/test_keywords.drl", InputType.XLS, 1, 1 ); // DT starts at Row 1, Column 1 System.out.println(drl); } cheers Steve On 2/17/07, Olenin, Vladimir (MOH) < Vladimir.Olenin(a)moh.gov.on.ca <mailto:Vladimir.Olenin@moh.gov.on.ca> > wrote: Hi, I wonder if it's possible to pass some Column keywords as parameters from template values, eg: Condition Condition $1 Driver $1 Policy age >= $2, age <= $3 type exists, 21, 25 , comprehensive not, 64, 100 exists, comprehensive I'd expect the above table would generate two rules like: Rule 1 When exists Driver (age >= 21, age <= 25) Policy(type == "comprehensive") Then // do smth End Rule 2 When not Driver (age >= 64, age <= 100) exists Policy (type == "comprehensive") then // do smth End The above example is just a mock up derived from one of the examples in the documentation to demonstrate the point (meaning, the rules themselves might not make sense from business point of view or can be implemented differently for this particular case). So, any way to achieve this? Whether in current version (3.0.x) or the upcoming release (3.2) Thanks, Vlad _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au <http://www.objectconsulting.com.au> consulting | development | training | support our experience makes the difference _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au <http://www.objectconsulting.com.au> consulting | development | training | support our experience makes the difference

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Need Help for jbossrules&eclipse Configuration

by Niloy Debnath

hi, i'm doing a project using jbossrules & eclipse on fedora core 4 platform.i've tried to configure jboss & eclipse.the steps i've followed is written below, 1.install j2sdk-1_4_2_13-linux-i586-rpm.bin and set the classpath 2.extract jbossrules-3.0.5-bin-withdeps.zip 3.extract eclipse-SDK-3.2.1-linux-gtk.tar.gz 4.put the org.drools.ide_1.0.0.jar plugin into the plugin directory of eclipse 5.put the GEF plugins into the eclipse plugin directory now i've gone to eclipse directory and run the eclipse using ./eclipse.it ran but when i tried to test the sample programs it compiled and threw errors.i've found the sample programs in the file named jbossrules-examples-3.0.5-src.zip. and put it into the default workspace of eclipse.i've followed the Drools Documentation 3.0.5 (Mark Proctor,Michael Neale,Peter Lin,Michael Frandsen) during the installation process. please guide me what i'll do now.i've noted one thing in the documentation that i need to have these tools installed,Eclipse 3.2,Subversion Client 1.3,Ant 1.6.i've only installed eclipse.do i need to install other two things?if yes then how do i install & configure that? moreover please tell me whether i am going right way or not. thanking you, Niloy Debnath --------------------------------- Heres a new way to find what you're looking for - Yahoo! Answers

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query question

by Kevin J. Schmidt

Can a query in a rules file be used in the LHS of another rule? -- Kevin J. Schmidt <kjschmidt(a)gmail.com> In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted. -Bertrand Russell

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RE: [rules-users] logical 'not' - is there such a construct?

by Olenin, Vladimir (MOH)

So, if used like that, 'not' does not have 'existential' meaning then, but simple 'negation'? I mean, the expression not MyObject(field == 'value') would still mean 'not exists', correct? Would the expression not (MyObject(field == 'value')) mean MyObject(field != 'value') then. In other worlds, "all objects OTHER then those matching the constraint"? Thanks. Vlad -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: 20 February 2007 14:37 To: Rules Users List Subject: Re: [rules-users] logical 'not' - is there such a construct? Vlad, In 3.1M1 you can write: rule X when not ( MyObject( aaa == "bbb" ) and MyObject2( bbb == "aaa" ) ) then // do something end But remember that variables bound inside the "not" block are not avaible in the consequence for obvious reasons. []s Edson Olenin, Vladimir (MOH) wrote: > Hi, > > I wonder if there is logical 'not' operator (in the meaning of "!=" -> > 'not equal') which can be applied to the whole rule? Eg: > > Rule x > > When > > ! ( > > MyObject(aaa == "bbb") > > MyObject2(bbb == "aaa") > > ) > > Then > > // do smth > > End > > Basically I'm looking for an operator to reverse the evaluation result > of the expression in the brackets. The use case: in my system all > rules are defined from 'rule passes' prospective, while the > application should take some action in case the rule is NOT passed > (ie, 'else' case). > > Any way to do that except reformulating the constraints themselves? > > Thanks, > > Vlad > >------------------------------------------------------------------------ > >_______________________________________________ >rules-users mailing list >rules-users(a)lists.jboss.org >https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3124-6000 Mobile: +55 11 9218-4151 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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Janino vs. Eclipse

by Dirk Bergstrom

I do not understand the difference between the Janino and Eclipse options for rules compilation. The documentation only says that there are two options, and the javadocs don't really go any further. Can someone provide more detail? My questions include: *) Why would I prefer one over the other? *) What are the advantages and disadvantages of each? *) In what situations is it necessary to use Janino? Which ones require Eclipse? *) Can I use the Eclipse compiler if I'm building rules outside of Eclipse (eg. dynamically generated rules in a web application)? *) I've read that the Eclipse compiler provides some sort of Java 1.5 compatibility/autoboxing/mumble-mumble. What's that about? I'll try to put the answers together into something that can be added to the manual (as soon as the manual is again buildable, see http://jira.jboss.com/jira/browse/JBRULES-672). Thanks. -- Dirk Bergstrom dirk(a)juniper.net _____________________________________________ Juniper Networks Inc., Computer Geek Tel: 408.745.3182 Fax: 408.745.8905

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logical 'not' - is there such a construct?

by Olenin, Vladimir (MOH)

Hi, I wonder if there is logical 'not' operator (in the meaning of "!=" -> 'not equal') which can be applied to the whole rule? Eg: Rule x When ! ( MyObject(aaa == "bbb") MyObject2(bbb == "aaa") ) Then // do smth End Basically I'm looking for an operator to reverse the evaluation result of the expression in the brackets. The use case: in my system all rules are defined from 'rule passes' prospective, while the application should take some action in case the rule is NOT passed (ie, 'else' case). Any way to do that except reformulating the constraints themselves? Thanks, Vlad

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Jar Files Required for Drools?

by Niyas

Hi all, For using Drools Rule Engine, what are the jar are files required? I have used Drools JBoss RUle Engine IDE in Eclispe. Now I want to use it without an IDE. So I want to know what are the required jar files: 1. drools-core.jar 2. drools-compiler.jar 3. drools-decisiontables.jar 4. drools-jsr94.jar The above jar files are enough..any other to be included..?

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RE: [rules-users] exists + normal column constraints - how many t imes a rule is cal led in the end????

by Olenin, Vladimir (MOH)

Thanks, Oana. I think I'm finally starting to get a grip on this thing :-). Vlad _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of nicolae oana Sent: 20 February 2007 03:38 To: Rules Users List Subject: Re: [rules-users] exists + normal column constraints - how many times a rule is cal led in the end???? Vlad, exists Person(role == "parent") checks if in workingMemory is at least one Person fact having attribute role == "parent", in both your examples. Your reasoning is correct: the four facts with role =="child" will activate the rule. So, the result for your second example will be the same as the first result, for your list of facts, no matter how you switch the columns. Regards, Oana "Olenin, Vladimir (MOH)" <Vladimir.Olenin(a)moh.gov.on.ca> wrote: Hi, I'm not sure my understanding of 'existential quantifiers' is correct. Hopefully, someone can clear it up a bit... Providing I have the following fact class: Person(role: parent/child, name) And following facts: 1: parent, John 2: parent, Alice 3: parent, Steve 4: parent, Jane 5: child, Eric 6: child, Rob 7: child, May 8: child, April I expect the rule Rule "iterate children if at least one parent is found" When exists Person(role == 'parent') $child: Person(role == 'child') Then // do smth for each $child if at least one parent is found End To iterate through all 'child' persons (facts 5 through 8), ie the action will be called exactly 4 times. Is this correct? What would happen if I swap the order of the conditions (with 'parent exists' constrain going _after_ 'child' constraint): When $child: Person(role == 'child') exists Person(role == 'parent') Thanks, Vlad _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _____ Now that's room service! Choose <http://travel.yahoo.com/hotelsearchpage;_ylc=X3oDMTFtaTIzNXVjBF9TAzk3NDA3NT g5BF9zAzI3MTk0ODEEcG9zAzIEc2VjA21haWx0YWdsaW5lBHNsawNxMS0wNw--%0d%0a> from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit.

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RE: [rules-users] Drools With Spring Framework Problem

by Olenin, Vladimir (MOH)

Check out 'Spring Modules' subproject - it has a DROOLS integration module. Haven't used it myself yet, so not sure whether it's mature/compatible with most recent release. https://springmodules.dev.java.net/docs/reference/0.7/html/jsr94.html#d0e570 9 https://springmodules.dev.java.net/ Vlad -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Niyas Sent: 19 February 2007 09:49 To: rules-users(a)lists.jboss.org Subject: [rules-users] Drools With Spring Framework Problem Hi all, I am in need of integrating Drools JBoss Rule Engine with Spring Framework. I have tried sample rule engine examples in the Drools in the standalone with the help od drools IDE for eclipse 3.2. And I also tried some example in the Spring Framework,to know how it works. I have tried some examples in IOC, MVC and JDBC in the spring framework. Now, I want to use both Drools and Spring Framework in such a way that Spring will have the MVC application and it should validate the rules, which written in the drools (.drl) I don't know how to begin with/what are he configuration files needed to setup. PLease if anyone have the sample coding on Drools with Spring or any other links willl be very useful. And also, guide me what are the things need to be know for Spring with Drools. While I have searched in google, lots of things came up like: Use JSR94... (which is mentioning to configure RuleServiceProvider, RuleRuntime, RuleSet..and others..which seeme to be confusing and not clear) Whether there are any API for drools with spring that DROOLS is supporting..like org.drools.spring.metadata.ArgumentMetadataSource. I don't find these Drools API section http://labs.jboss.com/file-access/default/members/jbossrules/freezone/docs/3 .0.5/apidocs/index.html _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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rules-users February 2007