Re: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database

I guess one of the ways you can handle it via a) Create a CustomHttpServletRequestWrapper (serializable class) that implements HttpServletRequest. b) Before you insert this wrapper class in drools session through your POJO, pass the values you need from your actual request object like - parameter map , attribute map (make sure attributes are serializable) through constructor to the wrapper class- and provide the implementation of only those methods that you will need in service or the ones that are related to parameter map /attributes such as i. getAttribute<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servl... name) ii. getAttributeNames<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/... iii. getParameter<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servl... name) iv. getParameterMap<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/se... v. getParameterNames<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/... vi. getParameterValues<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax... name) vii. removeAttribute<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/se... name) viii. setAttribute<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servl... name, java.lang.Object o) c) Either leave all other methods as empty or throw java.lang.UnsupportedOperationException I hope there is not too much of dependency on request object in your service class. ________________________________ From: Pardeep.Ruhil(a)lntinfotech.com [mailto:Pardeep.Ruhil@lntinfotech.com] Sent: Thursday, November 19, 2009 1:35 AM To: Vijay K Pandey Cc: kris.verlaenen(a)cs.kuleuven.be; rules-users(a)lists.jboss.org Subject: RE: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database Hi, Vijay, I am not doing this to store request object. loadSession.insert(request); What I am doing is I created a pojo class having setter and getter method of HttpServletRequest and some other class objects and declare this(request) as transient. So because of that this will not get store into the database and rest of the variables of pojo class gets way into the database. What you are telling to take the request map and insert that , I have done that part. But I have a service written in my project which takes request object as a parameter , which I have called in the ActionWorkItemHandler (custom Action Work Item made to execute my service). Now inside the exceute(WorkITem workItem, WorkItemManager manager) method of ActionWorkItemHandler when I am trying to retrieve the request object after loading session from the database. I am getting it as null, which is obvious as it was not stored in the database. So I just want to know if I have a non serilizable object , how can I pass that into the process and use this in a custom ActionWorkItemHandler. Please let me know if you understand what I am saying. Thanks & Regards Pardeep Ruhil L&T Infotech Ltd Mumbai Ph: +919820283884 Larsen & Toubro Infotech Ltd. www.Lntinfotech.com<http://www.lntinfotech.com/> This Document is classified as: L&T Infotech Proprietary L&T Infotech Confidential L&T Infotech Internal Use Only L&T Infotech General Business This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. Vijay K Pandey <VPandey(a)mdes.ms.gov&gt; 11/19/2009 10:44 AM To &quot;Pardeep.Ruhil(a)lntinfotech.com&quot; <Pardeep.Ruhil(a)lntinfotech.com&gt;, &quot;rules-users(a)lists.jboss.org&quot; <rules-users(a)lists.jboss.org&gt; cc &quot;kris.verlaenen(a)cs.kuleuven.be&quot; <kris.verlaenen(a)cs.kuleuven.be&gt; Subject RE: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database I don't understand what you meant by storing the HttpServletRequest object? With the default marshalling strategy for JPA in place I don't think you can insert a non serializable object? How come this piece of code is working fine at your end? loadSession.insert(request); Which set of objects are you looking from the request? May be you want to get hold of the request parameter map -- or create a list of attribute map and insert those instead of HttpServletRequest object Am I missing something of what you meant in your email? ________________________________ From: Pardeep.Ruhil(a)lntinfotech.com [mailto:Pardeep.Ruhil@lntinfotech.com] Sent: Wednesday, November 18, 2009 10:15 PM To: Vijay K Pandey; rules-users(a)lists.jboss.org Cc: kris.verlaenen(a)cs.kuleuven.be Subject: RE: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database Hi Vijay, Thanks for your reply. The problem is that object that I am inserting it into the session object is NOT serializable, as you know HttpServletRequest object is not serializable. So because of this I am not able to store this object into the database. So that's why I am asking how can i do this if my object is not serilizable. Thanks & Regards Pardeep Ruhil nt (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. Vijay K Pandey <VPandey(a)mdes.ms.gov&gt; 11/18/2009 10:56 PM To &quot;Pardeep.Ruhil(a)lntinfotech.com&quot; <Pardeep.Ruhil(a)lntinfotech.com&gt;, &quot;rules-users(a)lists.jboss.org&quot; <rules-users(a)lists.jboss.org&gt; cc &quot;kris.verlaenen(a)cs.kuleuven.be&quot; <kris.verlaenen(a)cs.kuleuven.be&gt; Subject RE: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database You have to load the same 'StatefulKnowledgeSession' in which you have inserted your objects. The inserted objects are serialized and stored in the column "rules_byte_array" of the session_info table. So you have to load the same session - to get to your inserted objects. There is a difference the way process map objects are handled - such as Map<String, Object> parameters = new HashMap<String, Object>(); parameters.put("x", "hello"); parameters.put("y", "hey I am y"); ksession.startProcess( "myprocess", parameters ); In the above case the parameters are not stored as part of the "session info" table. These are stored separately like in "process instance info" table + (some/other tables if you use variable persistence strategy)- so if you don't have the rules which are based on the objects you are inserting - you can get the same done through process parameters in which case you can get hold of the process instance through any new session or the same session and then its parameters. Vijay ________________________________ From: Pardeep.Ruhil(a)lntinfotech.com [mailto:Pardeep.Ruhil@lntinfotech.com] Sent: Wednesday, November 18, 2009 12:38 AM To: rules-users(a)lists.jboss.org Cc: kris.verlaenen(a)cs.kuleuven.be; Vijay K Pandey Subject: Re: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database Hi Kris, Thanks for you valuable input and Vijay of course clearing some of my doubts by asking question on this. Much of my doubt are clear except one. When we are reloading the StatefulKnowledgeSession from the database using the below line StatefulKnowledgeSession loadSession= JPAKnowledgeService.loadStatefulKnowledgeSession(id, kbase, null, env); This session object is different from the one that is created when we first created StatefulknowledgeSession object using StatefulKnowledgeSession initialSession= JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env); Am I right ? Now In my case I have a HumanWorkItemHandler class for handling the humantask and there is ActionWorkITemHandler for my customAction workItem, which both are initailsed with the initialSession object. Now when I load the session from the database to complete the HumanWorkItemHandler task I got a different session object i.e. loadSession. Now when I insert something in the loadsession using loadSession.insert(request); So that I can use the same in ActionWorkItemHandler to exceute the action for the request. I am not able to retrieve the same request object i.e. (HttpServletRequest) from the session in ActionWorkItemHandler as when i do Collection obj = loadSession.getObject(); I get request as null. Because this loadSession is different from the one I have inserted. Kindly help in this, or I have misunderstood the concept. Thanks & Regards Pardeep Ruhil Kris Verlaenen <kris.verlaenen(a)cs.kuleuven.be&gt; 11/17/2009 04:17 PM To Rules Users List <rules-users(a)lists.jboss.org&gt;, Vijay K Pandey <VPandey(a)mdes.ms.gov&gt; cc &quot;Pardeep.Ruhil(a)lntinfotech.com&quot; <Pardeep.Ruhil(a)lntinfotech.com&gt; Subject Re: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database Preferably you should cache the session itself as well (so you don't have to recreate it all the time) and reuse that across you application. Or you could have multiple independent sessions as well. If you store the key of the session somewhere, you can easily restore this session (or sessions) after failure. Kris Quoting Vijay K Pandey <VPandey(a)mdes.ms.gov&gt;: Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________