Using variables in Temporal Operators
by Mike Love
Hi,
Is it possible to use variables in temporal operators?
e.g. $eventA : EventA( this after[ 3m30s, 4m ] $eventB ) to be
expressed as $eventA
: EventA( this after[ $begin, $end ] $eventB )
where $begin and $end are either local rule variables or global variables
Regards
16 years
Drools 5 for process simulation
by Labin, Jonathan W.
Drools users,
I am currently researching Drools 5 as a potential toolkit to enable my next
project. I have read through the Documentation for Drools Expert, Flow and
skimmed through Fusion and I believe that Drools looks it provides many
features we need. However, I am concerned about one aspect of the way that
the system seems to operate and was wondering if anyone could point me to a
section of documentation (chapter of the manual / wiki / external how-to
blog post... whatever) that will clear things up for me.
I would like to use Drools Flow to define behaviors of agents as Flow
Processes to create an agent-based simulation. This application requires
that the processes are kept synchronized with each other by a simulated
(faster than real time) clock.
Is there a Drools mechanism that enables this? Would I need to create a set
of WorkItemHandler classes that perform the synchronization manually? Is
what I want to do not really practical within the Drools Flow framework?
Thanks in advance,
Jonathan Labin
16 years
Re: [rules-users] Where is MinaTaskClient ? (Gustavo Tenrreiro)
by Eugenio Abello
See this:
package org.drools.task.service.mina;
import org.drools.SystemEventListenerFactory;
import org.drools.task.service.TaskClient;
import org.drools.task.service.TaskServiceLifeCycleBaseTest;
import org.drools.task.service.mina.MinaTaskClientConnector;
import org.drools.task.service.mina.MinaTaskServer;
import org.drools.task.service.mina.MinaTaskClientHandler;
public class TaskServiceLifeCycleMinaTest extends
TaskServiceLifeCycleBaseTest {
private MinaTaskServer server;
@Override
protected void setUp() throws Exception {
super.setUp();
server = new MinaTaskServer(taskService);
Thread thread = new Thread(server);
thread.start();
Thread.sleep(500);
client = new TaskClient(new MinaTaskClientConnector("client 1",
new
MinaTaskClientHandler(SystemEventListenerFactory.getSystemEventListener())));
client.connect("127.0.0.1", 9123);
}
protected void tearDown() throws Exception {
super.tearDown();
client.disconnect();
server.stop();
}
}
16 years
Running decision table as web application
by Kripa Nathwani
Hello,
I have prepared a sample decision table and made it run as a java application by integrating Drools in Eclipse. Now how do I integrate decision table file (xls) into web application so that next time when any rule changes or a new one is added, I just have to make change in xls file and things would start working without any other change ?
For example:
I have created PF rule(12% of basic) in a decision table and now I want to integrate this decision table in my application so that next time PF rule changes (e.g. 15% of basic) I just have to modify from 12 to 15 and it would start reflecting the updated rule.
Hope it sounds clear.
Thanks
Kripa
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16 years
Re: [rules-users] Caching results in temperory variables
by Greg Barton
You must either update an existing working memory object or insert a new working memory object with the results. That's how rules communicate with each other.
GreG
On Aug 12, 2010, at 10:31 AM, Manav <manav7574(a)yahoo.com> wrote:
Hi,
I am using the version 5.x of drools and i have a scenario where i want to hold
the result of
a test in one rule to a temperory variable . This result will then be used in
another rule that will be fired
later in the sequence .
For ex :
salience 100
when
User (language.keySet contains "Japanese", $j_score : language["Japanese"])
then
// do something
end
salience 50
when
User (language.keySet contains "French", $f_score : language["French"])
then
// do something
end
salience 25
when
eval (($j_score + $f_score) > 4)
then
// update the same to db
end
Is this possible in Drools 5.x ?
Regards,
Manav
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16 years
Where is MinaTaskClient ?
by Gustavo Tenrreiro
Hi,
I am trying to connect to the mina server using the MinaTaskClient
referred in the documentation; however the class does not seem to
exist.
I got the latest Drools 5.1 download.
In any case how can I connect to the server in order to retrieve the tasks ?
I see the TaskClient has the methods I need, but I am not sure how to
create one, and everything I ve tried fails to retrieve a working
TaskClient.
I appreciate your help.
Thanks
16 years
A truly sibylline method
by Wolfgang Laun
Ancient Sibyls, such as the famous Pythia, frequently responded to
supplicants' questions in a dark and mysterious way. (Croesus, for instance,
was told that attacking the Persians would "destroy a great empire"; that
this could also mean his own did not occur to him.)
I was reminded of this by looking at the Javadoc for the
org.drools.time.SessionClock method getCurrentTime, which is documented to
return a long value, albeit explicitly stating that the semantics of this
value is not defined and that an implementation of this interface may do as
it pleases.
All that's needed to clear this oracular obfuscation is another method,
giving the number of nanoseconds per unit of the getCurrentTime return
value. Why ever has this not been added?
-W
16 years
Temporal operator "after"
by Wolfgang Laun
According to the Fusion manual, "after" is used like this:
$eventA : Foo(...)
$eventB : Bar( this after[0ms,1h] $eventA )
provided Foo and Bar have @role(event).
This works.
But, given a class Wrapper( Foo foo ), the pattern combination
Wrapper( $eventA : foo )
$eventB : Bar( this after[0ms,1h] $eventA )
results in a class cast exception at runtime, telling me that a Foo cannot
be cast to a org.drools.common.EventFactHandle.
Working around this by doing
Wrapper( $foo: foo )
$eventA : Foo( this == $foo )
$eventB : Bar( this after[0ms,1h] $eventA )
solves the problem, but is this really necessary and intentional? (The
documentation doesn't even hint at such a restriction.)
-W
16 years
generate an image of the instance the process
by Eugenio Abello
hi, I working with drools flow 5.1, and i want generate an image of the
instance the process, in the same way the gwt-console. I revice
org.drools.integration.console.graph.GraphViewerPluginImpl, but I can not
see how do..... there is some code of sample?
thanks
16 years
fireUntilHalt() and OSGi - CPU load
by Georg Maier
Hi,
I am using Drools 5.1 (final) in an OSGi environment. When invoking
fireUntilHalt() for my StatefulKnowledgeSession, CPU load rises to 25%
(meaning one complete core on the quad-core machine). Needless to say, when
two sessions are used in different components at the same time I'm reaching
about 50%.
When creating an "ordinary" Drools project and using a
StatefulKnowledgeSession with fireUntilHalt() I do not experience this
problem.
Anyone experienced something similar or has some advice for me?
Any help would be highly appreciated :-)
Thanks in advance!
Cheers,
Georg
16 years
