Memory management manual or automatic?
by marton.bokor
Hi,
If I have many processes (one starts every minute or so) and I pass
parameters as a map in startProcess and then I am inserting facts into the
working memory. These are local variables (both parameters and facts) in my
code which will eventually come out of scope when leaving their block and
will be garbage collected. I'm using one session for all process instances.
So my question is: when this happens, will the engine recognize this and
free the memory inside the flow or I need to perform manual cleanup like
retracting the fact etc. AFAIK a fact is just a pointer, but will it be
removed from the map by the engine? If so when?
Thanks,
Marton
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15 years, 10 months
Re: [rules-users] Loading facts and memory size limits
by Greg Barton
Do you have rules which relate two arbitrary customers together? If the answer is no (and even a limited yes) then the problem can process customers in parallel. That means you can break the processing down into smaller chunks and you don't need all customers in memory at once.
GreG
On Sep 9, 2010, at 3:27, bellios <carfid(a)gmail.com> wrote:
In my application I would to model the Customers-Sales domain and I thought
that drools could help me to express a set of rules to capture (or execute
on-demand) some "special" customers (e.g. take the customers which not
have/have bought some products of category X in the last 6 months).
To do this i'm loading the last 6 months sales into WM, afterwards on demand
i execute the rules. This process fails due the memory requirements. I
thought that Drools would use an hibernate/JPA/ or an incremental
mechanisms to load and process the facts.
@Swindells, Thomas: Do you think that it's the right approach?
@Michael Anstis-2: I will try to study in deep the event
processing\CEP\streaming methods.
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15 years, 10 months
Loading facts and memory size limits
by bellios
Hi all,
i have read the Documentation and the Drools book. I am developping an
application but i don't understand in my case how i can loading a
1,000,000,000 facts (approx).
At present I load all facts into a StatefulKnowledgeSession with a for-
cycle and I insert them into ksession ("ksession.insert(customer);")
The problem is the out of memory exception due the high memory
requirements of facts.
How i can resolve it? There is another approach to
facts loading into session? Can i integrate the loading with JPA/Hibernate
frameworks?
Thanks in advance for any suggestion,
David
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15 years, 10 months
Firing Specific rules using KBase and StatefulKnowledgeSession
by Vignesh
Hi,
We are not able to fire specific rules using KBase and
StatefulKnowledgeSession,
//Code snippet
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
ksession.fireAllRules(new RuleNameEndsWithAgendaFilter("test"));
If we use the method directly we are getting the below compile time error,
The method fireAllRules(int) in the type StatefulRuleSession is not
applicable for the arguments (RuleNameEndsWithAgendaFilter)
and when we cast it and used the same by
ksession.fireAllRules((AgendaFilter) new
RuleNameEndsWithAgendaFilter("test")); but getting the below exception,
java.lang.ClassCastException: org.drools.base.RuleNameEndsWithAgendaFilter
Same thing we are able to achieve using RuleBase and WorkingMemory as below,
RuleBase ruleBase = agent.getRuleBase();
WorkingMemory wrkMemory = ruleBase.newStatefulSession();
int i=wrkMemory.fireAllRules(new RuleNameEndsWithAgendaFilter("read"));
Any pointers on how to use this functionality for firing specific rules
using KBase and StatefulKnowledgeSession, by filtering out rules based on
rule names. Please help in this regard.
Thanks,
Vignesh
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15 years, 10 months
Guvnor connection Drolls API.
by tom ska
Hi,
what I want to do, is to initialise knowledgeBase with package created in
Guvnor. But I don't want to use changeSet.xml. I have my own configuration
file (apache commons configuration), and I want to load all connection's
data from this file. So I have in my config file: Guvnor's URL, and login
and password. I want to load my knowledgeBase in JAVA using this file. Is
this possible? To avoid using changeSet.xml?
Thanks,
tom.
15 years, 10 months
if else implementation in one rule
by Kripa Nathwani
Hello,
I need to implement a functionality as follows:
If an employee belongs to a particular state(MH) for a particular month(Feb) then take an action.
If an employee belongs to the same state(MH) but for different month (non Feb) then take another action.
I can implement it using two different rules(Feb rule and nonFeb rule). BUT if I want to implement it using a single rule is there any provision for the same in Drools?
Similar to an if-then-else statement in java.
Best Regards,
Kripa
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15 years, 10 months
Keeping track of sessions and their process instances
by Gustavo Tenrreiro
Hi,
I am working on a flow that uses flow events.
I send the event from a rule, and the only way I know to send an event
requires that I know the processId as well as the sessionId. Which
means I need to be able to keep track of both those two values so that
I can later use them to send the event.
So the question is what is the best strategy to keep track of the
sessions and the processes ?
The following is what I do; please comment on it, and feel free to
suggest a better way.
I ve created a class called WorkflowInfo that has two members (
processId, and sessionId )
When I start the process I create a WorkflowInfo, I set the processId,
and the sessionId then I insert it into the working memory:
WorkflowInfo info = new WorkflowInfo();
info.setProcessId(instance.getId());
info.setSessionId(ksession.getId());
ksession.insert(info);
In one of the rules I check for a condition, and when it is met I send
the flow event:
rule "sendEvent"
when
$info : WorkflowInfo()
<something is true>
then
DroolsEventsManager.getInstance().sendEvent($info.getProcessId(),
$info.getSessionId(), "someEvent");
end
Now to send the event this is what I do ( from a java class ):
public void sendEvent(long processId, int sessionId, String eventType)
{
StatefulKnowledgeSession session =
JPAKnowledgeSessionLookup.getInstance().loadSession(sessionId);
try {
SignalEventCommand command = new SignalEventCommand();
command.setProcessInstanceId(processId);
command.setEventType(eventType);
command.setEvent(true);
session.execute(command);
} catch (Exception e) {
Logger.getInstance().error(this.getClass(), e.getMessage());
e.printStackTrace();
}
finally{
session.dispose();
}
}
Does this approach make sense ?
Thanks
15 years, 10 months
Fwd: Artificial Intelligence: Expanding & Broadening Your Skills
by Edson Tirelli
Hey all,
Don't forget to register for Rules Fest 2010. As usual, we are holding a
bootcamp there where we can share experiences between Drools users and
developers. Last year the room was packed full, and we had a great meeting.
Hope to meet you there in October. More details on the e-mail bellow and
on the Drools blog:
http://blog.athico.com/2010/08/dont-forget-rulefest-october-2010.html
Cheers,
Edson
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Date: 2010/9/8
Subject: Artificial Intelligence: Expanding & Broadening Your Skills
To: tirelli(a)post.com
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15 years, 10 months
