/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package lupos.event.producer;
import java.util.*;
import lupos.datastructures.items.Triple;
import lupos.datastructures.items.literal.Literal;
import lupos.event.communication.*;
import lupos.event.util.Literals;
import lupos.event.util.Utils;
import org.json.JSONObject;
/**
* Produces events which contain current Bitcoin-related values gathered from Mt.Gox.
*
*/
public class MtGoxProducer extends ProducerBaseNoDuplicates {
public static final String NAMESPACE = "http://localhost/events/MtGox/";
private static final int INTERVAL = 10000;
private static final String API_BASE_URL = "https://mtgox.com/api/1/";
private static enum Currency {
EUR {
@Override
public String toString() {
return "EUR";
}
},
USD {
@Override
public String toString() {
return "USD";
}
}
}
private final Currency currency = Currency.EUR;
static class Predicates {
public static final Literal TYPE = Literals.createURI(NAMESPACE, "MtGoxEvent");
public static final Literal LAST_TRADE = Literals.createURI(NAMESPACE, "lastTrade");
public static final Literal BEST_BID = Literals.createURI(NAMESPACE, "bestBid");
public static final Literal BEST_ASK = Literals.createURI(NAMESPACE, "bestAsk");
}
public MtGoxProducer(SerializingMessageService msgService) throws Exception {
super(msgService, INTERVAL);
}
@Override
public List<List<Triple>> produceWithDuplicates() {
try {
String url = API_BASE_URL + "BTC" + this.currency + "/ticker";
String jsonStr = Utils.httpGet(url);
// get values from json response
JSONObject rootObj = new JSONObject(jsonStr);
JSONObject returnObj = rootObj.getJSONObject("return");
String lastLocalValue = returnObj.getJSONObject("last_local").getString("value");
String sellValue = returnObj.getJSONObject("buy").getString("value");
String buyValue = returnObj.getJSONObject("sell").getString("value");
List<Triple> triples = new ArrayList<Triple>();
// create triples
final Literal lastTradeObject = Literals.createTyped(lastLocalValue, Literals.XSD.DECIMAL);
final Literal bestBidObject = Literals.createTyped(sellValue, Literals.XSD.DECIMAL);
final Literal bestAskObject = Literals.createTyped(buyValue, Literals.XSD.DECIMAL);
triples.add(new Triple(Literals.AnonymousLiteral.ANONYMOUS, Literals.RDF.TYPE, Predicates.TYPE));
triples.add(new Triple(Literals.AnonymousLiteral.ANONYMOUS, Predicates.LAST_TRADE, lastTradeObject));
triples.add(new Triple(Literals.AnonymousLiteral.ANONYMOUS, Predicates.BEST_BID, bestBidObject));
triples.add(new Triple(Literals.AnonymousLiteral.ANONYMOUS, Predicates.BEST_ASK, bestAskObject));
return ProducerBase.fold(triples);
} catch (Exception e) {
System.err.println(e);
e.printStackTrace();
}
return null;
}
public static void main(String[] args) throws Exception {
// create communication channel
SerializingMessageService msgService = ProducerBase.connectToMaster();
// start producer
new MtGoxProducer(msgService).start();
}
}