Re: [rules-users] Reclaiming memory usage

Chris That defines the expiration policy for ReconfigEvent, but it does not define the relationship between ReconfigEvent and DataReading. Imagine a timeline, dotted with ReconfigEvents... what your rule is saying is for each DataReading event, match it with all the "periods where there is no ReconfigEvent", as the lifetime of DataReading is infinity. Maybe a simpler way of understanding it (without using the "not" for simplification) is think about this: declare Man @livesUpTo( 100 years ) end rule "marriage" when $w : Woman( age > 18 ) $m : Man( ) then // marry woman and man end The rule above defines that each woman will merry every existing man, even if each of them only lives for 100 years. Edson 2011/7/26 Chris Richmond <crichmond(a)referentia.com <mailto:crichmond@referentia.com>> Edson, I was under the impression that this: declare ReconfigEvent @role( event ) @expires ( 5s ) end would cover that, meaning that every ReconfigEvent would expire after 5s, thus causing to no longer be needed by the engine. Thanks, Chris On 7/25/2011 12:17 PM, Edson Tirelli wrote: > > Chris, > > I haven't tried your code, but just looking at the rule, there > is no temporal correlation between DataReading and ReconfigEvent, > so if I am not mistaken, that will create a required interval of > infinite time when the temporal reasoning is applied, meaning the > engine has to keep the readings in memory forever. > > Adding a temporal constraint on the ReconfigEvent pattern on > your rule or defining an explicit expiration policy for the > DataReadings are ways to work around that. > > Edson > > 2011/7/26 Chris Richmond <crichmond(a)referentia.com > <mailto:crichmond@referentia.com>> > > Hello > > I am performing a simple test of injecting an event every 1 > millisecond > like so: > > for (int x = 0; x < 100000; x++){ > DataReading dr = new DataReading("Reading " + x, 12.0f); > myStream.insert(dr); > ksession.fireAllRules(); > Thread.sleep(1); > > } > > > The rule that evaluates this is simple. It basically delays > "then" for > 3s to see if a followup reading is inserted and makes sure > that no > ReconfigEvent is active(5s expiration). > > So if a reading comes in and a followup reading is not > inserted within 3 > seconds and there is is not an existing ReconfigEvent event > alive, then > it should output and insert a ReconfigEvent, essentially > disabling any > DataReading action on those events for the next 5 seconds or > so. This > all works just fine as expected. > > My question is, how come I don't get memory back when all > 100,000 of my > events have been inserted. Memory goes up slowly over the > course of > insertions, which I can understand, but once that loop is > finished, > memory never reduces, so essentially, the application will > eventually > run out of memory after some time. I should not have to > explicitly > remove/retract events should I? Shouldn't they be removed > from working > memory as soon as they are no longer viable? What should I > be doing to > reclaim memory from the session/knowledgebase? > > I have included the full Main program here and the Sample.drl > file below it. > > ************FusionMain.java***************** > > package com.sample; > > import org.drools.KnowledgeBase; > import org.drools.KnowledgeBaseConfiguration; > import org.drools.KnowledgeBaseFactory; > import org.drools.builder.KnowledgeBuilder; > import org.drools.builder.KnowledgeBuilderError; > import org.drools.builder.KnowledgeBuilderErrors; > import org.drools.builder.KnowledgeBuilderFactory; > import org.drools.builder.ResourceType; > import org.drools.conf.EventProcessingOption; > import org.drools.io.ResourceFactory; > import org.drools.logger.KnowledgeRuntimeLogger; > import org.drools.logger.KnowledgeRuntimeLoggerFactory; > import org.drools.runtime.KnowledgeSessionConfiguration; > import org.drools.runtime.StatefulKnowledgeSession; > import org.drools.runtime.conf.ClockTypeOption; > import org.drools.runtime.rule.WorkingMemoryEntryPoint; > > > public class FusionMain { > > @SuppressWarnings("restriction") > public static void main(String[] args) { > > > try { > > KnowledgeSessionConfiguration config = > KnowledgeBaseFactory.newKnowledgeSessionConfiguration(); > config.setOption( ClockTypeOption.get("realtime") ); > > > KnowledgeBase kbase; > kbase = readKnowledgeBase(); > StatefulKnowledgeSession ksession = > kbase.newStatefulKnowledgeSession(); > > WorkingMemoryEntryPoint myStream = > ksession.getWorkingMemoryEntryPoint("My Stream"); > > for (int x = 0; x < 100000; x++){ > DataReading dr = new DataReading("Reading " + x, 12.0f); > myStream.insert(dr); > ksession.fireAllRules(); > Thread.sleep(1); > > } > > } catch (Exception e) { > // TODO Auto-generated catch block > e.printStackTrace(); > } > > } > > @SuppressWarnings("restriction") > private static KnowledgeBase readKnowledgeBase() throws > Exception { > KnowledgeBuilder kbuilder = > KnowledgeBuilderFactory.newKnowledgeBuilder(); > > kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), > ResourceType.DRL); > KnowledgeBuilderErrors errors = kbuilder.getErrors(); > if (errors.size() > 0) { > for (KnowledgeBuilderError error: errors) { > System.err.println(error); > } > throw new IllegalArgumentException("Could not parse > knowledge."); > } > > KnowledgeBaseConfiguration kbConfig = > KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); > kbConfig.setOption( EventProcessingOption.STREAM ); > KnowledgeBase kbase = > KnowledgeBaseFactory.newKnowledgeBase(kbConfig); > kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); > > > return kbase; > } > > > } > > > *********Sample.drl************************* > > package com.sample > > > import java.util.Date; > > declare DataReading > @role( event ) > end > > > declare ReconfigEvent > @role( event ) > @expires ( 5s ) > end > > > > rule "Wait for follup reading or no config" > //lock-on-active > when > > $dr: DataReading(reading > 10.0) from entry-point "My Stream" > not(DataReading(reading < 10.0, this after[0s,3s] $dr) from > entry-point "My Stream") > not(ReconfigEvent() from entry-point "My Stream") > > then > System.err.println("Action: " + new > Date(System.currentTimeMillis())); > System.err.println("Data reading " + $dr.getName() + " > > 10"); > ReconfigEvent rce = new ReconfigEvent(); > entryPoints["My Stream"].insert( rce ); > > end > > > > > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > -- > Edson Tirelli > JBoss Drools Core Development > JBoss by Red Hat @ www.jboss.com <http://www.jboss.com> > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com <http://www.jboss.com> _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users