Publisher-bekreftelser for pålitelighet

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class ConfirmSetup {
  public static void main(String[] args) throws Exception {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost"); // Assumes RabbitMQ is running locally
    try (Connection connection = factory.newConnection();
         Channel channel = connection.createChannel()) {

      channel.confirmSelect(); // This line enables confirm mode
      System.out.println("Channel is now in confirm mode.");
      // Further publishing code would go here
    }
  }
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class SyncConfirmPublisher {
  private static final String QUEUE_NAME = "sync_confirm_queue";

  public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    try (Connection connection = factory.newConnection();
         Channel channel = connection.createChannel()) {

      channel.queueDeclare(QUEUE_NAME, false, false, false, null);
      channel.confirmSelect(); // Enable confirm mode

      String message = "Hello, reliable world!";
      channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
      System.out.println(" [x] Sent '" + message + "'");

      // Wait for confirmation for up to 5 seconds
      if (channel.waitForConfirms(5000)) {
        System.out.println("Message confirmed by broker!");
      } else {
        System.out.println("Message not confirmed within timeout! It might be lost or delayed.");
      }
    }
  }
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.ConfirmListener;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;

public class AsyncConfirmPublisher {
  private static final String QUEUE_NAME = "async_confirm_queue";

  public static void main(String[] args) throws Exception {
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost("localhost");
    try (Connection connection = factory.newConnection();
         Channel channel = connection.createChannel()) {

      channel.queueDeclare(QUEUE_NAME, false, false, false, null);
      channel.confirmSelect(); // Enable confirm mode

      // Store unconfirmed messages by their delivery tag
      ConcurrentNavigableMap<Long, String> outstandingConfirms = new ConcurrentSkipListMap<>();

      channel.addConfirmListener(new ConfirmListener() {
        @Override
        public void handleAck(long deliveryTag, boolean multiple) throws IOException {
          if (multiple) {
            // Remove all messages up to this deliveryTag
            outstandingConfirms.headMap(deliveryTag + 1).clear();
          } else {
            outstandingConfirms.remove(deliveryTag);
          }
          System.out.println(" [x] Message with deliveryTag " + deliveryTag + " ACKed! Remaining: " + outstandingConfirms.size());
        }

        @Override
        public void handleNack(long deliveryTag, boolean multiple) throws IOException {
          String message = outstandingConfirms.get(deliveryTag);
          System.out.println(" [!] Message '" + message + "' (deliveryTag " + deliveryTag + ") NACKed! Re-sending or logging error.");
          // Handle NACK: re-publish, log, etc.
          if (multiple) {
             outstandingConfirms.headMap(deliveryTag + 1).clear();
          } else {
             outstandingConfirms.remove(deliveryTag);
          }
        }
      });

      String message = "Hello, async reliable world!";
      long nextPublishSeqNo = channel.getNextPublishSeqNo();
      outstandingConfirms.put(nextPublishSeqNo, message);
      channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
      System.out.println(" [x] Sent '" + message + "' (deliveryTag: " + nextPublishSeqNo + ")");

      // Keep main thread alive for a moment to receive confirms
      Thread.sleep(2000);
    }
  }
}