src/main/java/at/ac/tuwien/sbc/valesriegler/waiter/jms/messageListeners/WantToSitAtTable.java

   1 package at.ac.tuwien.sbc.valesriegler.waiter.jms.messageListeners;
   2
   3 import javax.jms.Connection;
   4 import javax.jms.DeliveryMode;
   5 import javax.jms.JMSException;
   6 import javax.jms.Message;
   7 import javax.jms.MessageConsumer;
   8 import javax.jms.MessageListener;
   9 import javax.jms.MessageProducer;
  10 import javax.jms.ObjectMessage;
  11 import javax.jms.Session;
  12
  13 import org.apache.activemq.ActiveMQConnectionFactory;
  14 import org.slf4j.Logger;
  15 import org.slf4j.LoggerFactory;
  16
  17 import at.ac.tuwien.sbc.valesriegler.group.actions.TableRequest;
  18 import at.ac.tuwien.sbc.valesriegler.group.actions.TableResponse;
  19 import at.ac.tuwien.sbc.valesriegler.types.Table;
  20 import at.ac.tuwien.sbc.valesriegler.waiter.Waiter;
  21
  22 /**
  23  * Listener listening on the WantToSitAtTable MQ, handling all incomming
  24  * messages.
  25  *
  26  * @author jan
  27  *
  28  */
  29 public class WantToSitAtTable implements MessageListener {
  30         private static final Logger log = LoggerFactory.getLogger(WantToSitAtTable.class);
  31         private final Waiter waiter;
  32
  33         public WantToSitAtTable(Waiter waiter) {
  34                 this.waiter = waiter;
  35         }
  36
  37         @Override
  38         public void onMessage(Message msg) {
  39                 try {
  40                         synchronized (waiter) {
  41                                 msg.acknowledge();
  42                                 if (msg instanceof ObjectMessage) {
  43                                         ObjectMessage objMsg = (ObjectMessage) msg;
  44                                         Object obj = objMsg.getObject();
  45
  46                                         if (obj instanceof TableRequest) {
  47                                                 TableRequest tablerequest = (TableRequest) obj;
  48                                                 log.debug("Received: " + tablerequest);
  49
  50                                                 // generate random delay
  51                                                 Thread.sleep((long) (Math.random() * 10000));
  52
  53                                                 ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost:61616");
  54                                                 Connection connection = connectionFactory.createConnection();
  55                                                 connection.start();
  56                                                 Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
  57
  58                                                 MessageConsumer consumer = session.createConsumer(session.createQueue("TablesFree"));
  59                                                 Message trm = consumer.receive();
  60                                                 if (trm instanceof ObjectMessage) {
  61                                                         ObjectMessage tom = (ObjectMessage) trm;
  62                                                         Object tabledata = tom.getObject();
  63
  64                                                         if (tabledata instanceof Table) {
  65                                                                 session.close();
  66                                                                 Table table = (Table) tabledata;
  67                                                                 System.out.println("Received: " + table);
  68
  69                                                                 TableResponse tr = new TableResponse(tablerequest.getGroupdata(), table, waiter.getId());
  70                                                                 session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
  71                                                                 MessageProducer ret = session.createProducer(session.createQueue("GroupConnector"));
  72                                                                 ret.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
  73                                                                 ret.send(session.createObjectMessage(tr));
  74
  75                                                         } else {
  76                                                                 log.warn("Received unknown Object: " + tabledata);
  77                                                         }
  78                                                 } else {
  79                                                         log.warn("Received unknown Message: " + trm);
  80                                                 }
  81                                                 session.close();
  82                                                 connection.close();
  83                                         } else {
  84                                                 log.warn("Received unknown Object: " + obj);
  85                                         }
  86                                 } else {
  87                                         log.warn("Received unknown Message: " + msg);
  88                                 }
  89                         }
  90                 } catch (JMSException e) {
  91                         log.error("EXCEPTION!", e);
  92                 } catch (InterruptedException e) {
  93                         log.error("EXCEPTION!", e);
  94                 }
  95         }
  96
  97 }