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");

try (Connection connection = factory.newConnection();

Channel channel = connection.createChannel()) {

channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.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 + "'");

}

}

}