Re: [rules-users] Executing rules actions asynchronously
Hi Spyros, I understand your ideia. and i think It's a good approach. Have to try it :) thx Regards Carlos V. Spyros Sakellariou wrote: My thinking is that when the Web Service returns (asynchronously through JMS or by an extra thread that you created) to insert the result into the memory perhaps as a generic reply object so other rules will fire when the object is inserted, depending of course on the contents of the reply object. You will have to use a stateful session for this to work and I think that you will have to keep calling the fireAllRules() after each returning Web Service reply is inserted into the working memory. About JMS it is a much better alternative of creating asynchronous requests than creating your own threads, as you will find support for Thread Pooling, Transactions, Priority queues etc. depending on the JMS implementation. Of course you can achieve the same with creating your own threads but I think it will be a lot of work. Spyros Spyros Sakellariou Principal Product Manager - Solution Architect Markopoulo Ave. 19002 Paiania Athens, Greece Tel. +30 210 667 9874 Mob. +30 694 700 7984 email [EMAIL PROTECTED] -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Carlos Vieira Sent: Wednesday, October 31, 2007 5:46 PM To: Rules Users List Subject: Re: [rules-users] Executing rules actions asynchronously Hi Spyros, Well, i tried launching a thread for each Web Service call, and it works ok... but i need to use the return of Web Service in the right side of the rule to, for example, insert another fact... so, i have to wait for the execution... What i want is to execute a set of actions (in the right side of a rule) in a different thread. But i will look for JMS to see capabilities, and to see if fit my purposes. Thx for the help Regards Carlos V. Spyros Sakellariou wrote: Hi Carlos, I don't know if this is possible in drools but an alternative is instead of calling web services synchronously from drools, to call them asynchronously using JMS. That way you don't have to wait for each service to return. Spyros -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Carlos Vieira Sent: Wednesday, October 31, 2007 5:02 PM To: rules-users@lists.jboss.org Subject: [rules-users] Executing rules actions asynchronously Hi, I'm facing a situation, that maybe some of you just solved out in the past. I need that the execution of matched rules ( Activations that are already in the Agenda, referencing those rules) is done asynchronously. In more detail, i need that each set of actions owned by two or more rules, runs in a separated thread. The problem here is that i need to invoke external Web Services in rule actions well, some Web Services may take too long to return something, what makes the other actions of other rules to wait for this... what is not an expected behavior... Any one knows if jboss rules already support this kind of approach? If not, any one has passed through this? Accessing to the mechanism of firing individual rules seems to be the best way, overriding a couple of classes. how can i fire just one rule with jboss rules? is this the best choice? Well, if anyone has any idea, it would be nice Regards Carlos V. ___ 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 begin:vcard fn:Carlos Vieira n:Vieira;Carlos org;quoted-printable:Telbit - Tecnologias de Informa=C3=A7=C3=A3o email;internet:[EMAIL PROTECTED] version:2.1 end:vcard ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Missing BRMS Classes
Hi, These classes are under drools-compiler project. http://anonsvn.labs.jboss.com/labs/jbossrules/trunk/drools-compiler/src/main/java/org/drools/brms/ On 11/2/07, Tong Wang [EMAIL PROTECTED] wrote: Greetings, While looking at the source code of BRMS, I found that some classes are missing. For example: org.drools.brms.client.modeldriven.SuggestionCompletionEngine org.drools.brms.client.modeldriven.brl.ActionFieldValue org.drools.brms.client.modeldriven.brl.ActionInsertFact org.drools.brms.client.modeldriven.brl.ActionInsertLogicalFact and a few others, which seem to be classes under the org.drools.brms.client.modeldriven package. I tried the downloadable src zip for 4.0.3 and also checked out src from SVN, but both were missing these classes. However, the BRMS WAR file downloaded was working for me, which indicates that the WAR and the src are out of sync. Thanks, Tong ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Fernando Meyer http://fmeyer.org JBoss Rules Core Developer [EMAIL PROTECTED] ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Quickstart: Drools 4.0.3 Web Admin (BRMS)
Posted a walkthrough on getting the BRMS up and creating a single rule: http://macjavadev.blogspot.com/2007/11/quickstart-drools-403-web- admin-brms.html -= J ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] question on syntax with FROM keyword
put brackets around the SomeObject and from statement not ( SomeObject(val == 5) from dao.find(99) ) Eric Miles wrote: I'm trying to use the FROM keyword in a way that I think it should be able to be used, but I'm getting compilation errors. Here are the 2 ways that I'm getting stumped on: exist SomeObject(val == 5) from dao.find(99) and not AnotherObject(val == Dad) from anotherDao.find(1) If I remove the exist and not, everything compiles okay. With the first test, I'd like to ensure an object exists AND it has a value of 5. dao.find could return a null, so I don't want the test to crap out because of a NullPointerException. With the second one, I want to ensure the collection returned from anotherDao.find call does not have an AnotherObject instance with a value of Dad. These seem like fairly trivial things to test for, so I'm fairly certain there's an appropriate way to structure these test. Any help is appreciated. Thanks all. Eric ___ 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
Re: [rules-users] question on syntax with FROM keyword
That works, thanks a bunch. However, the exists still will not work as I had hoped. The brackets do not help if dao.find(99) returns a null; I receive a null pointer exception. Is there any way to deal with that gracefully in drools? That's why I wanted to use the exists syntax... exists (SomeObject(val == 5) from dao.find(99)) Thanks! Eric On Fri, 2007-11-02 at 17:19 +, Mark Proctor wrote: put brackets around the SomeObject and from statement not ( SomeObject(val == 5) from dao.find(99) ) Eric Miles wrote: I'm trying to use the FROM keyword in a way that I think it should be able to be used, but I'm getting compilation errors. Here are the 2 ways that I'm getting stumped on: exist SomeObject(val == 5) from dao.find(99) and not AnotherObject(val == Dad) from anotherDao.find(1) If I remove the exist and not, everything compiles okay. With the first test, I'd like to ensure an object exists AND it has a value of 5. dao.find could return a null, so I don't want the test to crap out because of a NullPointerException. With the second one, I want to ensure the collection returned from anotherDao.find call does not have an AnotherObject instance with a value of Dad. These seem like fairly trivial things to test for, so I'm fairly certain there's an appropriate way to structure these test. Any help is appreciated. Thanks all. Eric ___ 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
[rules-users] Dynamically selecting a subflow at runtime
Hi, When creating a ruleflow, is there a mechanism that allows me to select which subflow is executed at runtime? I don't want to have to hardcode a specific subflow in the Ruleflow GUI/editor. Here's a contrived example of what I'm attempting to do: If the following subflows exist: bake cookies, bake pizza, grill steaks, fry fish, etc., I'd like to have a ruleflow with the following rulegroups: |Start| - Get Order - Make food - Cleanup - |Repeat|. For a requested order, the corresponding subflow is invoked at the Make food stage then the process repeats. I saw that calling drools.getWorkingMemory().startProcess(...) might be an option, however I'm not sure that this will return control to the original ruleflow when done (causing the Cleanup group to not get executed). If I try to use the subflow widget in the Ruleflow GUI I have to explicitly name the subflow I want invoked. thank you -- View this message in context: http://www.nabble.com/Dynamically-selecting-a-subflow-at-runtime-tf4728437.html#a13520181 Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Instatiating Global Variables
I am having a few issues with Global Variables and was wondering if someone could possibly explain them to me. I am coming from a CLIPS/JESS background where globals are very straight forward. ie (global ?*FAMILY_NAME* = SMITH) and you can use it everywhere after that. You can declare them anywhere you want(ie outside/inside rules, inside a function call), use them whenever you want (within the LHS/RHS or in a function) and modify them whenever you want (although you shouldn't). In Drools however, they seem overly complicated. For instance.I can't declare and initialize a global in the same line. IE you can't do this global String FAMILY_NAME = SMITH; Instead you have to just declare the global as.global String FAMILY_NAME. Then after it's declared it can be set.Although for the life of me, setting it is not straight forward either. In a different thread on this list someone suggested doing the followingie making sure the salience number is the highest of any rule forcing it to always fire first rule Initialize Rule salience 100 when eval(FAMILY_NAME == null); then WorkingMemory wm = drools.getWorkingMemory(); String familyName = SMITH; wm.setGlobal(FAMILY_NAME, familyName); System.out.println(FAMILY_NAME = + FAMILY_NAME); end this does not seem to set the Global Variable value.The result is...FAMILY_NAME = null. and any other rule that I have in place that utilizes this global doesn't fire. ie rule First Rule to Fire when eval(FAMILY_NAME != null) then . end This never fires However, if through my java application (not in a DRL file), I call ..code. workingMemory.setGlobal(FAMILY_NAME, familyName); fireAllRules(); more code then my Firest Rule To Fire rule fires as expected. There has to be something I am not fully understanding here because it doesn't seem right that I can't create and set the Global all in one step, or the fact that I can't set the variable value in a rule, but only through a java app. I also don't understand why the Globals can't be used directly by functions and why they have to be passed in as a variable to the function. If the function and the Global are defined within a specific working memory, then it should be available to all rules and functions within that same working memory. Similar to Java Class Member Data. The member data is available anywhere in that class. If anyone can help shed some light on the subject I would be very grateful! Joshua -- View this message in context: http://www.nabble.com/Instatiating-Global-Variables-tf4740897.html#a13556883 Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
