Re: [rules-users] Initialize Global
I am doing something similar and having some issues. I am physically calling setGlobal, but it doesn't seem to be getting setexample global String USER_NAME; rule Initialize Globals salience 100 when eval(USRE_NAME == null ) then String name = Josh; drools.getWorkingMemory().setGlobal(USER_NAME, name); System.out.println(Local Name : + name); System.out.println(Global Name : + USER_NAME); end This produces Josh Null Not sure I fully follow what is happening.I am calling setGlobal, but the value does not appear to get set, thus the null in the last output statement. Also any other rule I have set up that utilizes the USER_NAME global won't fire, ie rule Second Rule to Fire when eval(USER_NAME != null) then System.out.println(Fired Second Rule); end This rule never fires. Can anyone explain this? And just to clarify, yes, USER_NAME is going to be immutable once set. Thanks in advance! Joshua Kris Verlaenen wrote: You can create a rule that initializes your global, preferrably with a high salience so it gets executed first: rule InitializeGlobal salience 100 when then ArrayList objectList = new ArrayList(); objectList.add(1); objectList.add(2); drools.getWorkingMemory().setGlobal(objectList, objectList); end Kris - Original Message - From: drools_user [EMAIL PROTECTED] To: rules-users@lists.jboss.org Sent: Wednesday, October 24, 2007 7:35 PM Subject: [rules-users] Initialize Global How do I initialize a global fact in the drl file? I want use the JSR94 API and avoid using the Drools API inside the Java code. I would like to access the same variable every execution of a stateful session without having to reinstantiate the variable after each execution? Basically I want to define a global like this: # Define global variable global List objectList ; # Part that does not work objectList = new ArrayList() ; objectList.add(1); objectList.add(2); Thanks -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13388685 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 mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13517718 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
Re: [rules-users] Initialize Global
I have the same problem, but eval(objectList == null) doesn't work. If I don't execute drools.getWorkingMemory().setGlobal() it works fine, as if the rule activates and the object is null. global List objectList; rule Start salience 101 when #conditions then objectList = new ArrayList() ; objectList.add(1); objectList.add(2); System.out.println(Start objectList:+objectList); //drools.getWorkingMemory().setGlobal(objectList, objectList); end rule end salience 97 when eval (objectList == null) then System.out.println(End objectList: +objectList); end gives: Start objectList:[1, 2] End objectList: null Next I uncomment the drools.getWorkingMemory().setGlobal(objectList, objectList); and run the rule again an get: Start objectList:[1, 2] End objectList: [1, 2] so the objectList isn't null, but the rule still activates... Kris Verlaenen schreef: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ 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] Initialize Global
If your List is not immutable, you can't use global. You have to use WM facts. V. java_user_ wrote: Thanks. That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? Kris Verlaenen wrote: You can create a rule that initializes your global, preferrably with a high salience so it gets executed first: rule InitializeGlobal salience 100 when then ArrayList objectList = new ArrayList(); objectList.add(1); objectList.add(2); drools.getWorkingMemory().setGlobal(objectList, objectList); end Kris - Original Message - From: drools_user [EMAIL PROTECTED] To: rules-users@lists.jboss.org Sent: Wednesday, October 24, 2007 7:35 PM Subject: [rules-users] Initialize Global How do I initialize a global fact in the drl file? I want use the JSR94 API and avoid using the Drools API inside the Java code. I would like to access the same variable every execution of a stateful session without having to reinstantiate the variable after each execution? Basically I want to define a global like this: # Define global variable global List objectList ; # Part that does not work objectList = new ArrayList() ; objectList.add(1); objectList.add(2); Thanks -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13388685 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 mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13484636 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
Re: [rules-users] Initialize Global
It's normal. Globally, the rule engine works in two steps : - first : the activation (the when statement) - second : the execution (the then statement) with salience, ruleflow ... In your test, you have in the first step objectList = null and in the second step objectList = [1, 2]. If you want to re-activate your rule, you have to do an update/insert/remove action... But you can't do that with globals. So you need to use the WM facts. Waruzjan Shahbazian-2 wrote: I have the same problem, but eval(objectList == null) doesn't work. If I don't execute drools.getWorkingMemory().setGlobal() it works fine, as if the rule activates and the object is null. global List objectList; rule Start salience 101 when #conditions then objectList = new ArrayList() ; objectList.add(1); objectList.add(2); System.out.println(Start objectList:+objectList); //drools.getWorkingMemory().setGlobal(objectList, objectList); end rule end salience 97 when eval (objectList == null) then System.out.println(End objectList: +objectList); end gives: Start objectList:[1, 2] End objectList: null Next I uncomment the drools.getWorkingMemory().setGlobal(objectList, objectList); and run the rule again an get: Start objectList:[1, 2] End objectList: [1, 2] so the objectList isn't null, but the rule still activates... Kris Verlaenen schreef: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ 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 -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13484734 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
Re: [rules-users] Initialize Global
Thanks, that sounds logical to me. I guess I just have to trust that the rule where the array gets initialised activates earlier than the rule where I need the array. That shouldn't be a problem since I use salience and to avoid nullpoint exceptions I can use the if(objectList != null) in the Then part of the rule where I need the array. Maybe an idea for the drools developers to create an update function for the globals so we can eval on them too...in the future. vdelbart schreef: It's normal. Globally, the rule engine works in two steps : - first : the activation (the when statement) - second : the execution (the then statement) with salience, ruleflow ... In your test, you have in the first step objectList = null and in the second step objectList = [1, 2]. If you want to re-activate your rule, you have to do an update/insert/remove action... But you can't do that with globals. So you need to use the WM facts. Waruzjan Shahbazian-2 wrote: I have the same problem, but eval(objectList == null) doesn't work. If I don't execute drools.getWorkingMemory().setGlobal() it works fine, as if the rule activates and the object is null. global List objectList; rule Start salience 101 when #conditions then objectList = new ArrayList() ; objectList.add(1); objectList.add(2); System.out.println(Start objectList:+objectList); //drools.getWorkingMemory().setGlobal(objectList, objectList); end rule end salience 97 when eval (objectList == null) then System.out.println(End objectList: +objectList); end gives: Start objectList:[1, 2] End objectList: null Next I uncomment the drools.getWorkingMemory().setGlobal(objectList, objectList); and run the rule again an get: Start objectList:[1, 2] End objectList: [1, 2] so the objectList isn't null, but the rule still activates... Kris Verlaenen schreef: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ 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
RE: [rules-users] Initialize Global
This is in essence already catered for - you need a LHS fact. A global is just a holder for some (immutable) set of values\functions to make life easier for common (immutable) values\functions your rule may need. If you want to start making the global mutable for RETE to use the changes they become facts. rule Start salience 101 when then MyGlobalObject myGlobal = new MyGlobalObject(); ArrayList objectList = new ArrayList() ; objectList.add(1); objectList.add(2); myGlobal.setList(objectList); System.out.println(Start objectList: + objectList); insert(myGlobal); end rule end salience 97 when $g : MyGlobalObject( list != null ) then System.out.println(End objectList: + $g.getList()); end -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Waruzjan Shahbazian Sent: 30 October 2007 09:31 To: Rules Users List Subject: Re: [rules-users] Initialize Global Thanks, that sounds logical to me. I guess I just have to trust that the rule where the array gets initialised activates earlier than the rule where I need the array. That shouldn't be a problem since I use salience and to avoid nullpoint exceptions I can use the if(objectList != null) in the Then part of the rule where I need the array. Maybe an idea for the drools developers to create an update function for the globals so we can eval on them too...in the future. vdelbart schreef: It's normal. Globally, the rule engine works in two steps : - first : the activation (the when statement) - second : the execution (the then statement) with salience, ruleflow ... In your test, you have in the first step objectList = null and in the second step objectList = [1, 2]. If you want to re-activate your rule, you have to do an update/insert/remove action... But you can't do that with globals. So you need to use the WM facts. Waruzjan Shahbazian-2 wrote: I have the same problem, but eval(objectList == null) doesn't work. If I don't execute drools.getWorkingMemory().setGlobal() it works fine, as if the rule activates and the object is null. global List objectList; rule Start salience 101 when #conditions then objectList = new ArrayList() ; objectList.add(1); objectList.add(2); System.out.println(Start objectList:+objectList); //drools.getWorkingMemory().setGlobal(objectList, objectList); end rule end salience 97 when eval (objectList == null) then System.out.println(End objectList: +objectList); end gives: Start objectList:[1, 2] End objectList: null Next I uncomment the drools.getWorkingMemory().setGlobal(objectList, objectList); and run the rule again an get: Start objectList:[1, 2] End objectList: [1, 2] so the objectList isn't null, but the rule still activates... Kris Verlaenen schreef: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ 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 smime.p7s Description: S/MIME cryptographic signature ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Initialize Global
Hi Kris, I am using a JSR94 stateful session. My design is to initialize the global list once and reuse it within the same session. The init-global rule is being executed each execution because there is no conditional statement. Can I disable the rule for future executions? Thanks Kris Verlaenen wrote: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13491481 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
RE: [rules-users] Initialize Global
Did you try Kris's suggested LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. This should provide the condition you request and prevent the rule from firing after the global has been initialised. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of java_user_ Sent: 30 October 2007 16:06 To: rules-users@lists.jboss.org Subject: Re: [rules-users] Initialize Global Hi Kris, I am using a JSR94 stateful session. My design is to initialize the global list once and reuse it within the same session. The init-global rule is being executed each execution because there is no conditional statement. Can I disable the rule for future executions? Thanks Kris Verlaenen wrote: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13491481 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 smime.p7s Description: S/MIME cryptographic signature ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Initialize Global
Yes, I used the conditional eval(objectList == null) The global keeps getting destroyed after each execution. I am using a stateful rule session. I was hoping the global could be reused for each execution without having to re-init. I was able to do this in Jess by instantiating the global without having to use a rule. Then I was able to use the same list each execution of my stateful session without having to recreate the list. The Jess list is an internal Jess object and not a Java ArrayList. Jess Code to declare and initialize a global list: (defglobal ?*objectList* = (create$ (new String s0) (new String s1) ) ) Anstis, Michael (M.) wrote: Did you try Kris's suggested LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. This should provide the condition you request and prevent the rule from firing after the global has been initialised. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of java_user_ Sent: 30 October 2007 16:06 To: rules-users@lists.jboss.org Subject: Re: [rules-users] Initialize Global Hi Kris, I am using a JSR94 stateful session. My design is to initialize the global list once and reuse it within the same session. The init-global rule is being executed each execution because there is no conditional statement. Can I disable the rule for future executions? Thanks Kris Verlaenen wrote: That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13491481 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 mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13493442 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
Re: [rules-users] Initialize Global
Thanks. That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? Kris Verlaenen wrote: You can create a rule that initializes your global, preferrably with a high salience so it gets executed first: rule InitializeGlobal salience 100 when then ArrayList objectList = new ArrayList(); objectList.add(1); objectList.add(2); drools.getWorkingMemory().setGlobal(objectList, objectList); end Kris - Original Message - From: drools_user [EMAIL PROTECTED] To: rules-users@lists.jboss.org Sent: Wednesday, October 24, 2007 7:35 PM Subject: [rules-users] Initialize Global How do I initialize a global fact in the drl file? I want use the JSR94 API and avoid using the Drools API inside the Java code. I would like to access the same variable every execution of a stateful session without having to reinstantiate the variable after each execution? Basically I want to define a global like this: # Define global variable global List objectList ; # Part that does not work objectList = new ArrayList() ; objectList.add(1); objectList.add(2); Thanks -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13388685 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 mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13471016 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
Re: [rules-users] Initialize Global
That initialized my global but the rule still runs every execution. Can I disable the rule after the first execution? What do you mean by every execution. A rule should only be executed once, unless it gets reactivated (which should not be the case in this situation). I would like to use (if (objectList==null)). My list is not immutable. Can I make a similar rule for the LHS? You can test whether the global is null using eval( objectList == null ) in the LHS of the rule. Kris ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Initialize Global
Do you want a true global variable or a fact available to all rules? Either way, you could have a rule to set it up... Rule init-global When Then myGlobal.doSomethingToInitialiseIt(); End Rule init-fact When $f : MyFact() Then $f.doSomethingToInitialiseIt(); End -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of drools_user Sent: 24 October 2007 18:35 To: rules-users@lists.jboss.org Subject: [rules-users] Initialize Global How do I initialize a global fact in the drl file? I want use the JSR94 API and avoid using the Drools API inside the Java code. I would like to access the same variable every execution of a stateful session without having to reinstantiate the variable after each execution? Basically I want to define a global like this: # Define global variable global List objectList ; # Part that does not work objectList = new ArrayList() ; objectList.add(1); objectList.add(2); Thanks -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13388685 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 smime.p7s Description: S/MIME cryptographic signature ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Initialize Global
You can create a rule that initializes your global, preferrably with a high salience so it gets executed first: rule InitializeGlobal salience 100 when then ArrayList objectList = new ArrayList(); objectList.add(1); objectList.add(2); drools.getWorkingMemory().setGlobal(objectList, objectList); end Kris - Original Message - From: drools_user [EMAIL PROTECTED] To: rules-users@lists.jboss.org Sent: Wednesday, October 24, 2007 7:35 PM Subject: [rules-users] Initialize Global How do I initialize a global fact in the drl file? I want use the JSR94 API and avoid using the Drools API inside the Java code. I would like to access the same variable every execution of a stateful session without having to reinstantiate the variable after each execution? Basically I want to define a global like this: # Define global variable global List objectList ; # Part that does not work objectList = new ArrayList() ; objectList.add(1); objectList.add(2); Thanks -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13388685 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 mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Initialize Global
Beware, 2.5.4.5. Globals If you use a global on the LHS of a rule, make sure it is immutable. regards, V. java_user_ wrote: How do I initialize a global fact in the drl file? I want use the JSR94 API and avoid using the Drools API inside the Java code. I would like to access the same variable every execution of a stateful session without having to reinstantiate the variable after each execution? Basically I want to define a global like this: # Define global variable global List objectList ; # Part that does not work objectList = new ArrayList() ; objectList.add(1); objectList.add(2); Thanks -- View this message in context: http://www.nabble.com/Initialize-Global-tf4685186.html#a13406827 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
