JAMES-2334 Demonstrate that published messages are not lost without c…

…onsumer

server/queue/queue-rabbitmq/pom.xml

@@ -37,6 +37,10 @@
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.jayway.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.rabbitmq</groupId>
             <artifactId>amqp-client</artifactId>

server/queue/queue-rabbitmq/src/test/java/org/apache/james/queue/rabbitmq/RabbitMQFixture.java

@@ -0,0 +1,46 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *   http://www.apache.org/licenses/LICENSE-2.0                 *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.queue.rabbitmq;
+
+import static com.jayway.awaitility.Duration.FIVE_HUNDRED_MILLISECONDS;
+import static com.jayway.awaitility.Duration.ONE_MINUTE;
+
+import com.jayway.awaitility.Awaitility;
+import com.jayway.awaitility.Duration;
+import com.jayway.awaitility.core.ConditionFactory;
+import com.rabbitmq.client.AMQP;
+
+public class RabbitMQFixture {
+    public static final boolean DURABLE = true;
+    public static final boolean AUTO_ACK = true;
+    public static final AMQP.BasicProperties NO_PROPERTIES = null;
+    public static final String EXCHANGE_NAME = "exchangeName";
+    public static final String ROUTING_KEY = "routingKey";
+    public static final String DIRECT = "direct";
+
+    public static Duration slowPacedPollInterval = FIVE_HUNDRED_MILLISECONDS;
+    public static ConditionFactory calmlyAwait = Awaitility.with()
+        .pollInterval(slowPacedPollInterval)
+        .and()
+        .with()
+        .pollDelay(slowPacedPollInterval)
+        .await();
+    public static ConditionFactory awaitAtMostOneMinute = calmlyAwait.atMost(ONE_MINUTE);
+}

server/queue/queue-rabbitmq/src/test/java/org/apache/james/queue/rabbitmq/RabbitMQTest.java

@@ -0,0 +1,75 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *   http://www.apache.org/licenses/LICENSE-2.0                 *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+package org.apache.james.queue.rabbitmq;
+
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.AUTO_ACK;
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.DIRECT;
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.DURABLE;
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.EXCHANGE_NAME;
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.NO_PROPERTIES;
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.ROUTING_KEY;
+import static org.apache.james.queue.rabbitmq.RabbitMQFixture.awaitAtMostOneMinute;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import com.rabbitmq.client.Channel;
+import com.rabbitmq.client.Connection;
+import com.rabbitmq.client.ConnectionFactory;
+
+@ExtendWith(DockerRabbitMQExtension.class)
+class RabbitMQTest {
+
+    private static final byte[] PAYLOAD = "Hello, world!".getBytes(StandardCharsets.UTF_8);
+
+    @Test
+    void publishedEventWithoutSubscriberShouldNotBeLost(DockerRabbitMQ rabbitMQ) throws Exception {
+        ConnectionFactory connectionFactory = rabbitMQ.connectionFactory();
+        try (Connection connection = connectionFactory.newConnection();
+                Channel channel = connection.createChannel()) {
+            String queueName = createQueue(channel);
+
+            publishAMessage(channel);
+
+            awaitAtMostOneMinute.until(() -> messageReceived(channel, queueName));
+        }
+    }
+
+    private String createQueue(Channel channel) throws IOException {
+        channel.exchangeDeclare(EXCHANGE_NAME, DIRECT, DURABLE);
+        String queueName = channel.queueDeclare().getQueue();
+        channel.queueBind(queueName, EXCHANGE_NAME, ROUTING_KEY);
+        return queueName;
+    }
+
+    private void publishAMessage(Channel channel) throws IOException {
+        channel.basicPublish(EXCHANGE_NAME, ROUTING_KEY, NO_PROPERTIES, PAYLOAD);
+    }
+
+    private Boolean messageReceived(Channel channel, String queueName) {
+        try {
+            return channel.basicGet(queueName, !AUTO_ACK) != null;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+}