ass3-messaging/src/main/java/dst/ass3/messaging/impl/RequestGateway.java

   1 package dst.ass3.messaging.impl;
   2
   3 import com.fasterxml.jackson.databind.ObjectMapper;
   4 import com.rabbitmq.client.Channel;
   5 import com.rabbitmq.client.Connection;
   6 import com.rabbitmq.client.ConnectionFactory;
   7 import com.rabbitmq.client.MessageProperties;
   8 import dst.ass3.messaging.Constants;
   9 import dst.ass3.messaging.IRequestGateway;
  10 import dst.ass3.messaging.UploadRequest;
  11
  12 import java.io.IOException;
  13 import java.util.concurrent.TimeoutException;
  14
  15 public class RequestGateway implements IRequestGateway {
  16     Connection conn;
  17     Channel channel;
  18
  19     public RequestGateway() {
  20         ConnectionFactory factory = new ConnectionFactory();
  21         factory.setHost(Constants.RMQ_HOST);
  22         factory.setPort(Integer.parseInt(Constants.RMQ_PORT));
  23         factory.setUsername(Constants.RMQ_USER);
  24         factory.setPassword(Constants.RMQ_PASSWORD);
  25
  26         try {
  27             conn = factory.newConnection();
  28             channel = conn.createChannel();
  29         } catch (IOException | TimeoutException e) {
  30             throw new RuntimeException("Irrecoverable error", e); // Fail horribly
  31         }
  32     }
  33
  34     @Override
  35     public void uploadRequest(UploadRequest request) {
  36         String routingKey = null;
  37         switch (request.getType()) {
  38             case DOCUMENT:
  39                 routingKey = Constants.ROUTING_KEY_DOCUMENT;
  40                 break;
  41             case QUIZ:
  42                 routingKey = Constants.ROUTING_KEY_QUIZ;
  43                 break;
  44             case VIDEO:
  45                 routingKey = Constants.ROUTING_KEY_VIDEO;
  46                 break;
  47         }
  48
  49         ObjectMapper mapper = new ObjectMapper();
  50         try {
  51             channel.basicPublish(Constants.TOPIC_EXCHANGE, routingKey, false, false, MessageProperties.BASIC, mapper.writeValueAsBytes(request));
  52         } catch (IOException e) {
  53             e.printStackTrace(); // TODO: may not be irrecoverable!
  54         }
  55     }
  56
  57     @Override
  58     public void close() throws IOException {
  59         try {
  60             channel.close();
  61         } catch (TimeoutException ignored) {
  62         }
  63         conn.close();
  64     }
  65 }