Java tutorial
/** TwitStreet - Twitter Stock Market Game Copyright (C) 2012 Engin Guller (bisanthe@gmail.com), Cagdas Ozek (cagdasozek@gmail.com) 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 3 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, see <http://www.gnu.org/licenses/>. **/ package com.twitstreet.twitter; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import org.apache.log4j.Logger; import com.google.inject.Inject; import com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException; import com.twitstreet.config.ConfigMgr; import com.twitstreet.db.base.DBConstants; import com.twitstreet.db.base.DBMgr; import com.twitstreet.db.data.Stock; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.TwitterFactory; import twitter4j.auth.AccessToken; public class TwitstreetAnnouncerImpl implements TwitstreetAnnouncer { private Twitter twitter = null; @Inject ConfigMgr configMgr; @Inject DBMgr dbMgr; private static Logger logger = Logger.getLogger(TwitstreetAnnouncerImpl.class); @Override public boolean mention(Stock stock, String message) { if (addStockIntoAnnouncement(stock.getId())) { twitter = new TwitterFactory().getInstance(); twitter.setOAuthConsumer(configMgr.getAnnouncerConsumerKey(), configMgr.getAnnouncerConsumerSecret()); twitter.setOAuthAccessToken( new AccessToken(configMgr.getAnnouncerAccessToken(), configMgr.getAnnouncerAccessSecret())); try { twitter.updateStatus("@" + stock.getName() + " " + message); } catch (TwitterException e) { logger.error("sendMessage:" + stock.getName() + " " + message); } return true; } return false; } public boolean addStockIntoAnnouncement(long stockid) { Connection connection = null; PreparedStatement ps = null; ResultSet rs = null; try { connection = dbMgr.getConnection(); ps = connection.prepareStatement("insert into announcement(stock_id) VALUES (?) "); ps.setLong(1, stockid); ps.executeUpdate(); logger.debug(DBConstants.QUERY_EXECUTION_SUCC + ps.toString()); return true; // } catch (MySQLIntegrityConstraintViolationException ex) { // // return false; } catch (SQLException e) { return false; } finally { dbMgr.closeResources(connection, ps, rs); } } @Override public void removeOldRecords(int olderThanMinutesOld) { Connection connection = null; PreparedStatement ps = null; ResultSet rs = null; try { connection = dbMgr.getConnection(); ps = connection .prepareStatement(" delete from announcement where timestampdiff(minute,timeSent,now()) > ? "); ps.setInt(1, olderThanMinutesOld); ps.executeUpdate(); logger.debug(DBConstants.QUERY_EXECUTION_SUCC + ps.toString()); } catch (SQLException e) { logger.error(DBConstants.QUERY_EXECUTION_FAIL + ps.toString(), e); } finally { dbMgr.closeResources(connection, ps, rs); } } }