[TASK] Do the very basic setup and have a simple, working s p o query.

This commit is contained in:
Jan Philipp Timme 2016-05-24 14:08:24 +02:00
parent 61aa0e5697
commit 0d6f4d2530
2 changed files with 108 additions and 1 deletions

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@ -0,0 +1,46 @@
package lu.jpt.csparqltest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import eu.larkc.csparql.cep.api.RdfQuadruple;
import eu.larkc.csparql.cep.api.RdfStream;
public class CarStreamGenerator extends RdfStream implements Runnable {
protected final Logger logger = LoggerFactory.getLogger(CarStreamGenerator.class);
private int counter = 1;
private volatile boolean keepRunning = false;
public CarStreamGenerator(String iri) {
super(iri);
}
public void pleaseStop() {
keepRunning = false;
}
@Override
public void run() {
this.keepRunning = true;
while (this.keepRunning) {
final RdfQuadruple q = new RdfQuadruple(getIRI() + "/S" + this.counter, getIRI() + "/P" + this.counter,
getIRI() + "/O" + this.counter, System.currentTimeMillis());
if (this.counter % 10 == 0) {
logger.info(this.counter + " triples streamed so far");
}
this.put(q);
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
this.counter++;
}
}
}

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package lu.jpt.csparqltest; package lu.jpt.csparqltest;
import java.text.ParseException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import eu.larkc.csparql.cep.api.RdfStream;
import eu.larkc.csparql.core.engine.ConsoleFormatter;
import eu.larkc.csparql.core.engine.CsparqlEngine;
import eu.larkc.csparql.core.engine.CsparqlEngineImpl;
import eu.larkc.csparql.core.engine.CsparqlQueryResultProxy;
public class Main { public class Main {
private static Logger logger = LoggerFactory.getLogger(Main.class);
public static void main(String[] args) { public static void main(String[] args) {
System.out.println("Hello"); logger.debug("Let's go!");
// Instantiate and initialize engine
CsparqlEngine engine = new CsparqlEngineImpl();
engine.initialize(true);
// Create and register stream generator at specific URI
RdfStream carStreamGenerator = new CarStreamGenerator("http://myexample.org/stream");
engine.registerStream(carStreamGenerator);
// Run stream generator
final Thread t = new Thread((Runnable) carStreamGenerator);
t.start();
// Now build a query to run
String query = "REGISTER QUERY MyQueryName AS "
+ "PREFIX ex: <http://myexample.org/> "
+ "SELECT ?s ?p ?o "
+ "FROM STREAM <http://myexample.org/stream> [RANGE 5s STEP 1s] "
+ "WHERE { ?s ?p ?o "
+ "} ";
// Create a result proxy by registering the query at the engine
CsparqlQueryResultProxy resultProxy = null;
try {
resultProxy = engine.registerQuery(query, false);
} catch (ParseException e1) {
logger.error(e1.toString());
logger.error(e1.getStackTrace().toString());
}
// Add ConsoleFormatter as observer so it gets notified of every query result
resultProxy.addObserver(new ConsoleFormatter());
// Let it all run for a couple of seconds
try {
Thread.sleep(200000);
} catch (InterruptedException e) {
logger.error(e.getMessage(), e);
}
// Unregister the resultProxy (and thus the query) from the engine
engine.unregisterQuery(resultProxy.getId());
// Softly stop the stream generator and unregister it from the engine
((CarStreamGenerator) carStreamGenerator).pleaseStop();
engine.unregisterStream(carStreamGenerator.getIRI());
// That's it!
System.exit(0);
} }
} }