Java tutorial
/* * Copyright (C) 2015 Nu Development Team * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ package com.nubits.nubot.pricefeeds.feedservices; import com.nubits.nubot.models.Amount; import com.nubits.nubot.models.CurrencyPair; import com.nubits.nubot.models.LastPrice; import com.nubits.nubot.pricefeeds.FeedFacade; import com.nubits.nubot.utils.Utils; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; public class BtcePriceFeed extends AbstractPriceFeed { private static final Logger LOG = LoggerFactory.getLogger(BtcePriceFeed.class.getName()); public static final String name = FeedFacade.BtcePriceFeed; public BtcePriceFeed() { refreshMinTime = 50 * 1000; //one minutee } @Override public LastPrice getLastPrice(CurrencyPair pair) { long now = System.currentTimeMillis(); long diff = now - lastRequest; if (diff >= refreshMinTime) { String url = getUrl(pair); String htmlString; try { htmlString = Utils.getHTML(url, true); } catch (IOException ex) { LOG.error(ex.toString()); return new LastPrice(true, name, pair.getOrderCurrency(), null); } JSONParser parser = new JSONParser(); try { JSONObject httpAnswerJson = (JSONObject) (parser.parse(htmlString)); JSONObject tickerObject = (JSONObject) httpAnswerJson.get("ticker"); double last = Utils.getDouble(tickerObject.get("last")); lastRequest = System.currentTimeMillis(); lastPrice = new LastPrice(false, name, pair.getOrderCurrency(), new Amount(last, pair.getPaymentCurrency())); return lastPrice; } catch (Exception ex) { LOG.error(htmlString); LOG.error(ex.toString()); lastRequest = System.currentTimeMillis(); return new LastPrice(true, name, pair.getOrderCurrency(), null); } } else { LOG.warn("Wait " + (refreshMinTime - (System.currentTimeMillis() - lastRequest)) + " ms " + "before making a new request. Now returning the last saved price\n\n"); return lastPrice; } } private String getUrl(CurrencyPair pair) { return "https://btc-e.com/api/2/" + (pair.toStringSep()).toLowerCase() + "/ticker/"; } }