Inserting new facts in the THEN clause (RHS) is possible in a stateless session (except if you set it to run in sequential mode). You can also create rules' conditions that operate on those "inferred" facts.<br>
<br>To get them back as results, you can either bind a global variable and add the results to it or use:<br><br>org.drools.StatelessSession#<br> StatelessSessionResult executeWithResults(Collection collection);<br><br>
Cheers,<br>Leo.<br><br><br><br><div class="gmail_quote">2011/5/17 Greg Stasica <span dir="ltr"><<a href="mailto:gstasica@pacemetrics.com">gstasica@pacemetrics.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">
hi,<br>
you can't use stateless session for your problem.<br>
<br>
<a href="http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/html/ch02.html#d0e254" target="_blank">http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/html/ch02.html#d0e254</a><br>
"<span style="border-collapse:separate;color:rgb(0, 0, 0);font-family:'Times New Roman';font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:medium"><span style="color:rgb(51, 51, 51);font-family:'Lucida Grande',Geneva,Verdana,Arial,sans-serif;font-size:12px;line-height:18px;text-align:justify"><a>A stateless session can be called like a function
passing it some data and then receiving some results back</a></span></span>"<br>
<br>
the way i understand "...receiving some results back" part is that
facts can be updated (you can call methods on them) but inserting
any new facts into session in WHEN section is not possible<div><div></div><div class="h5"><br>
<br>
<br>
On 06/05/2011 20:05, Dean Whisnant wrote:
<blockquote type="cite">
<pre>This is not an answer to your question, but rather asking the same question with a slight twist:
I'm in the middle of trying to see if I can shift from stateful to stateless in my project and the "session.getObjects" method is what we would use in stateful as well to read back all of the new objects created during rules execution. My project seems to be much more geared towards stateless and thus far testing has shown our time would benefit significantly from the change.
I see in the docs where ExecutionResults are used with the execute:
ExecutionResults results = ksession.execute(CommandFactory.newBatchExecution( cmds) );
But even within results I do not see how to gather my objects from memory.
Any thoughts on what I am missing here?
Thanks
Dean
-----Original Message-----
From: <a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a> [<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">mailto:rules-users-bounces@lists.jboss.org</a>] On Behalf Of aminmc
Sent: Saturday, April 16, 2011 2:31 PM
To: <a href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a>
Subject: [rules-users] Use of StatelessKnowledgeSession
Hi there
I was wondering if someone might be able to help with what I am trying to do. I have the following rule definition:
rule "open work item"
when
Task ( status == "OPEN")
then
insert(new Action("Take","take_task"));
insert(new Action("Complete","complete_task"));
insert(new Action("Close","close_task"));
end
Basically I want to insert a Task and then get back a list of Actions that are available for the Task (based on the status. I have this working with a statefulknowledgesession with the code:
List<Command> commands = new ArrayList<Command>();
for (Task task : tasks) {
commands.add(CommandFactory.newInsert(task));
}
session.execute(CommandFactory.newBatchExecution(commands));
session.fireAllRules();
session.dispose();
//this returns the actions
Collection objects = session.getObjects(new ClassObjectFilter(Action.class));
I was wondering whether it is possible to do this with a statelessknowledgesession instead? I could'nt see how to achieve this without updating the task to include the actions.
Any help would be appreciated.
Cheers
--
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</pre>
</blockquote>
<br>
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Greg Stasica
PaceMetrics Ltd.
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