Correlating 2 independent streams of events
by Esteban Aliverti
Let's say I have two independent streams of different events: EventA and
EventB. Which is the best way to get all the occurrences of EventB that
happened between the last 3 occurrences of EventA?
For example:
from:
$b1:EventB, $a1:EventA, $b2:EventB, $b3:EventB, $a2:EventA,
$b4:EventB, $b5:EventB, $a3:EventA, $b6:EventB
I would like to get $b2, $b3, $b4, $b5
Best Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Blog @ http://ilesteban.wordpress.com
13 years, 2 months
Finding matching values in composite constraint
by bdolbeare
Is there a way to determine (in the rule consequence) which condition in a
composite constraint caused a rule to succeed?
I am working on a system that allows users to create rules via a custom UI
and when one of their rules fires, I want to be able to create a message
that describes why their rule fired. In a real example, they might have a
list of a few hundred conditions in a composite constraint.
An example rule with just two conditions in a composite constraint follows:
rule "test rule"
when
MyObject( (myfield str[startsWith] "a" || myfield str[startsWith] "b") )
then
System.out.prinltn(kcontext.getRule().getName() + " fired because myfield
started with ???");
end
Is this exposed somewhere in the variables like kcontext that are available
to each rule in their consequence?
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13 years, 2 months
Drools Fusion and Twitter Storm
by karlunho
Hi Folks,
I'd like to hear about any stories of using Drools in combination with
Twitter's Storm <http://storm-project.net/> .
The problem that I'm trying to solve is making a highly scalable event
processing system with the following properties:
1. Lots of events for the same timeframe - that means if the events expire
within 30 minutes, there are too many events to compute in a 30 minute
period for a single node
2. Fault tolerant - Meaning that if a node goes down, event processing will
not be affected or data will not be lost.
3. Perform Aggregates across large number of events
Has anyone tried to integrate the two systems ? There are a couple of
thoughts that I have why the two would be a nice match:
1. Twitter Storm seems to take care of most of the distributed processing
problem. Specifically, it allows for generating partial aggregate on
multiple nodes, followed by creating complete aggregates across nodes. Kind
of like a streaming map-reduce system.
2. Drools seems to have better a better language for event processing -
especially when there are layers and layers of business rules.
3. Drools Guvnor allows on-the-fly modification of rules - this is a huge
limitation of Twitter storm because it does not allow on-the-fly
modification of event processing topologies.
Let me know what everyone thinks (or if anyone has implemented this) !
The system I'm planning to apply this to is a mobile analytics system where
we are collecting network traffic and log data across potentially millions
of smartphones in real-time.
Regards,
Alan Ho
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13 years, 2 months
Re: [rules-users] debug
by Kevin Kelleher
Hi All,
I'm wondering what the status is re this "debug not working" drools issue.
It's been out there for quite a while now. It would be great to get feedback
re this.
Folks out there must be using 5.5.0 core, so I'm wondering how they are
coping this issue.
Regards,
Kevin
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13 years, 2 months
Planner: How to Set Global Varaiables
by jonathan.labin
I see in the documentation for Drools Expert a description of how to set
global variables through the API via a StatefullKnowledgeSession or
StatelessKnowledgeSession.
How is this achieved when using the Drools Planner? I have a solver
instance that is created from a XmlSolverFactory (as shown in the examples).
Is there a sequence of getters calls originating at the Solver instance that
ultimately gets to the ksession on which setGlobal can be called?
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13 years, 2 months
Re: [rules-users] Migrate from 5.2.0 to 5.5.0
by ge0ffrey
Alex wrote
> Hello,
>
> I am trying to migrate from drools version 5.2.0 to 5.5.0 and after change
> libs i get a error:
>
> java.lang.NoClassDefFoundError: Could not initialize class
> org.drools.rule.builder.DefaultConstraintBuilderFactory
> at org.drools.rule.builder.DroolsCompilerComponentFactory.
> <init>
> (DroolsCompilerComponentFactory.java:11)
> at
> org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:210)
> at org.drools.compiler.PackageBuilderConfiguration.
> <init>
> (PackageBuilderConfiguration.java:165)
> at
> org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilderConfiguration(KnowledgeBuilderFactoryServiceImpl.java:26)
> at
> org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(KnowledgeBuilderFactory.java:85)
>
> Could you please help me with this problem?
Looks like you re combining the wrong jars together, check your classpath
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13 years, 2 months
