EmitLogHeader.java

import com.rabbitmq.client.*;

import java.util.HashMap;
import java.util.Map;

public class EmitLogHeader {

  private static final String EXCHANGE_NAME = "header_test";

  public static void main(String[] argv) throws Exception {
    if (argv.length < 1) {
      System.err.println("Usage: EmitLogHeader message queueName [headers]...");
      System.exit(1);
    }

    // The API requires a routing key, but in fact if you are using a header exchange the
    // value of the routing key is not used in the routing. You can store information
    // for the receiver here as the routing key is still available in the received message.
    String routingKey = "ourTestRoutingKey";

    // Argument processing: the first arg is the message, the rest are
    // key value pairs for headers.
    String message = argv[0];

    // The map for the headers.
    Map<String, Object> headers = new HashMap<String, Object>();

    // The rest of the arguments are key value header pairs.  For the purpose of this
    // example, we are assuming they are all strings, but that is not required by RabbitMQ
    for (int i = 1; i < argv.length; i++) {
      System.out.println("Adding header " + argv[i] + " with value " + argv[i + 1] + " to Map");
      headers.put(argv[i], argv[i + 1]);
      i++;
    }

    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    Connection connection = factory.newConnection();
    Channel channel = connection.createChannel();

    channel.exchangeDeclare(EXCHANGE_NAME, "headers");

    AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();

    // MessageProperties.PERSISTENT_TEXT_PLAIN is a static instance of AMQP.BasicProperties
    // that contains a delivery mode and a priority. So we pass them to the builder.
    builder.deliveryMode(MessageProperties.PERSISTENT_TEXT_PLAIN.getDeliveryMode());
    builder.priority(MessageProperties.PERSISTENT_TEXT_PLAIN.getPriority());

    // Add the headers to the builder.
    builder.headers(headers);

    // Use the builder to create the BasicProperties object.
    AMQP.BasicProperties theProps = builder.build();

    // Now we add the headers.  This example only uses string headers, but they can also be integers
    channel.basicPublish(EXCHANGE_NAME, routingKey, theProps, message.getBytes("UTF-8"));
    System.out.println(" [x] Sent message: '" + message + "'");
  }
}