Переполнение есть

lab3/consumer/app/src/main/java/dev/tishenko/consumer/Recv.java

@@ -5,23 +5,51 @@ import com.rabbitmq.client.Connection;
 import com.rabbitmq.client.ConnectionFactory;
 import com.rabbitmq.client.DeliverCallback;
 
+import java.util.HashMap;
+import java.util.Map;
+
 public class Recv {
     private final static String QUEUE_NAME = "hello";
 
     public static void main(String[] argv) throws Exception {
+        String delayEnv = System.getenv("CONSUMER_DELAY_MS");
+        int delay = delayEnv != null ? Integer.parseInt(delayEnv) : 5000;
+
+        String maxLengthEnv = System.getenv("QUEUE_MAX_LENGTH");
+        int maxLength = maxLengthEnv != null ? Integer.parseInt(maxLengthEnv) : 5;
+
+        String overflowStrategy = System.getenv("QUEUE_OVERFLOW");
+        if (overflowStrategy == null) {
+            overflowStrategy = "drop-head"; // или "reject-publish"
+        }
+
         ConnectionFactory factory = new ConnectionFactory();
         factory.setHost("rabbitmq");
+
         Connection connection = factory.newConnection();
         Channel channel = connection.createChannel();
 
-        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
-        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
+        Map<String, Object> args = new HashMap<>();
+        args.put("x-max-length", maxLength);
+        args.put("x-overflow", overflowStrategy);
+
+        channel.queueDeclare(QUEUE_NAME, false, false, false, args);
+        channel.basicQos(1);
+
+        System.out.println(" [*] Waiting for messages...");
 
         DeliverCallback deliverCallback = (consumerTag, delivery) -> {
             String message = new String(delivery.getBody(), "UTF-8");
             System.out.println(" [x] Received '" + message + "'");
+            try {
+                Thread.sleep(delay);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
         };
-        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
+
+        channel.basicConsume(QUEUE_NAME, false, deliverCallback, consumerTag -> {
         });
     }
 }

lab3/docker-compose.yml

@@ -15,6 +15,9 @@ services:
       context: ./producer
     depends_on:
       - rabbitmq
+      - consumer
+    environment:
+      - PRODUCER_DELAY_MS=1000
     networks:
       - rabbitnet
 
@@ -24,6 +27,9 @@ services:
       context: ./producer
     depends_on:
       - rabbitmq
+      - consumer
+    environment:
+      - PRODUCER_DELAY_MS=1000
     networks:
       - rabbitnet
 
@@ -33,6 +39,10 @@ services:
       context: ./consumer
     depends_on:
       - rabbitmq
+    environment:
+      - CONSUMER_DELAY_MS=1000
+      - QUEUE_MAX_LENGTH=10
+      - QUEUE_OVERFLOW=reject-publish # drop-head, reject-publish
     networks:
       - rabbitnet
 

lab3/producer/app/src/main/java/dev/tishenko/producer/Send.java

@@ -8,14 +8,29 @@ public class Send {
     private static final String QUEUE_NAME = "hello";
 
     public static void main(String[] args) throws Exception {
+        String delayEnv = System.getenv("PRODUCER_DELAY_MS");
+        int delay = delayEnv != null ? Integer.parseInt(delayEnv) : 1000;
+
         ConnectionFactory factory = new ConnectionFactory();
         factory.setHost("rabbitmq");
+
         try (Connection connection = factory.newConnection();
                 Channel channel = connection.createChannel()) {
-            channel.queueDeclare(QUEUE_NAME, false, false, false, null);
-            String message = "Hello World!";
-            channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
-            System.out.println(" [x] Sent '" + message + "'");
+
+            boolean durable = false;
+            boolean exclusive = false;
+            boolean autoDelete = false;
+
+            // channel.queueDeclare(QUEUE_NAME, durable, exclusive, autoDelete, null);
+            channel.queueDeclarePassive(QUEUE_NAME);
+
+            int count = 0;
+            while (true) {
+                String message = "Message #" + count++;
+                channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
+                System.out.println(" [x] Sent '" + message + "'");
+                Thread.sleep(delay);
+            }
         }
     }
 }