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TwitterCBROffline.java
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TwitterCBROffline.java
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/*
* Copyright 2011 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.examples.twittercbr;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.concurrent.TimeUnit;
import org.drools.ClockType;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseConfiguration;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.conf.EventProcessingOption;
import org.drools.io.ResourceFactory;
import org.drools.runtime.KnowledgeSessionConfiguration;
import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.runtime.conf.ClockTypeOption;
import org.drools.runtime.rule.WorkingMemoryEntryPoint;
import org.drools.time.SessionPseudoClock;
import twitter4j.Status;
import twitter4j.StatusListener;
import twitter4j.TwitterException;
/**
* TwitterCBR
*/
public class TwitterCBROffline {
public static final boolean disableLog = true;
/**
* Main method
*/
public static void main(String[] args) throws TwitterException, IOException{
if( args.length == 0 ) {
System.out.println("Please provide the rules file name to load.");
System.exit( 0 );
}
// Creates a knowledge base
final KnowledgeBase kbase = createKnowledgeBase( args[0] );
// Creates a knowledge session
final StatefulKnowledgeSession ksession = createKnowledgeSession( kbase );
// Gets the stream entry point
final WorkingMemoryEntryPoint ep = ksession.getWorkingMemoryEntryPoint( "twitter" );
new Thread( new Runnable() {
@Override
public void run() {
// Starts to fire rules in Drools Fusion
ksession.fireUntilHalt();
}
}).start();
// reads the status stream and feeds it to the engine
feedEvents( ksession,
ep );
ksession.halt();
}
/**
* Feed events from the stream to the engine
* @param ksession
* @param ep
*/
private static void feedEvents( final StatefulKnowledgeSession ksession,
final WorkingMemoryEntryPoint ep ) {
try {
StatusListener listener = new TwitterStatusListener( ep );
ObjectInputStream in = new ObjectInputStream( new FileInputStream( "src/main/resources/twitterstream.dump" ) );
SessionPseudoClock clock = ksession.getSessionClock();
for( int i = 0; ; i++ ) {
try {
// Read an event
Status st = (Status) in.readObject();
// Using the pseudo clock, advance the clock
clock.advanceTime( st.getCreatedAt().getTime() - clock.getCurrentTime(), TimeUnit.MILLISECONDS );
// call the listener
listener.onStatus( st );
} catch( IOException ioe ) {
break;
}
}
in.close();
} catch ( Exception e ) {
e.printStackTrace();
}
}
/**
* Creates a Drools KnowledgeBase and adds the given rules file into it
*/
private static KnowledgeBase createKnowledgeBase( final String rulesFile ) {
// Parses and compiles the rules file
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newClassPathResource( rulesFile ), ResourceType.DRL );
// Configures the Stream mode
KnowledgeBaseConfiguration conf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
conf.setOption( EventProcessingOption.STREAM );
// Creates the knowledge base and adds the rules
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase( conf );
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
return kbase;
}
/**
* Creates a Drools Stateful Knowledge Session
*/
private static StatefulKnowledgeSession createKnowledgeSession( final KnowledgeBase kbase ) {
final KnowledgeSessionConfiguration ksconf = KnowledgeBaseFactory.newKnowledgeSessionConfiguration();
ksconf.setOption( ClockTypeOption.get( ClockType.PSEUDO_CLOCK.getId() ) );
final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession( ksconf, null );
return ksession;
}
static {
// disable twitter4j log
System.setProperty( "twitter4j.loggerFactory", "twitter4j.internal.logging.NullLoggerFactory" );
}
}