Implement fire and forget anonymous send

src/ArtemisNetCoreClient/AnonymousProducer.cs

@@ -9,6 +9,17 @@ public ValueTask DisposeAsync()
         return session.RemoveProducerAsync(ProducerId);
     }
 
+    public void SendMessage(string address, RoutingType? routingType, Message message)
+    {
+        message.Address = address;
+        if (routingType != null)
+        {
+            message.RoutingType = routingType;
+        }
+
+        session.SendMessage(message: message, producerId: ProducerId);
+    }
+
     public async ValueTask SendMessageAsync(string address, RoutingType? routingType, Message message, CancellationToken cancellationToken = default)
     {
         message.Address = address;

src/ArtemisNetCoreClient/Extensions/AnonymousProducerExtensions.cs

@@ -6,8 +6,35 @@ namespace ActiveMQ.Artemis.Core.Client;
 public static class AnonymousProducerExtensions
 {
     /// <summary>
-    /// Sends a message to the specified address.
+    /// Sends a message synchronously to the broker. This method is primarily used for non-durable
+    /// message delivery since it does not wait for a confirmation from the broker and operates
+    /// in a fire-and-forget manner.
     /// </summary>
+    /// <remarks>
+    /// This method should typically be used when message delivery speed is prioritized over reliability.
+    /// The message will be sent with 'at most once' delivery guarantee, as there's no acknowledgment
+    /// from the broker that the message has been received or persisted.
+    /// </remarks>
+    /// <param name="anonymousProducer">The <see cref="IAnonymousProducer"/> instance that this method extends.</param>
+    /// <param name="address">The address to which the message should be sent.</param>
+    /// <param name="message">The message to send.</param>
+    public static void SendMessage(this IAnonymousProducer anonymousProducer, string address, Message message)
+    {
+        anonymousProducer.SendMessage(address, routingType: null, message);
+    }
+
+    /// <summary>
+    /// Sends a message asynchronously to the broker. This method supports both durable and non-durable message
+    /// delivery modes, as specified by the message's durable property. It awaits for a confirmation
+    /// from the broker, ensuring that the message is either stored (for durable messages) or acknowledged
+    /// (for non-durable messages) before completing.
+    /// </summary>
+    /// <remarks>
+    /// This method should be used when reliability is required, and it supports awaiting the acknowledgment
+    /// from the broker. The delivery semantics are 'at least once' for durable messages, where the broker
+    /// confirms the persistence of the message. For non-durable messages, the completion of the task
+    /// indicates that the broker has received the message.
+    /// </remarks>
     /// <param name="anonymousProducer">The <see cref="IAnonymousProducer"/> instance that this method extends.</param>
     /// <param name="address">The address to which the message should be sent.</param>
     /// <param name="message">The message to send.</param>

src/ArtemisNetCoreClient/IAnonymousProducer.cs

@@ -6,8 +6,34 @@ namespace ActiveMQ.Artemis.Core.Client;
 public interface IAnonymousProducer : IAsyncDisposable
 {
     /// <summary>
-    /// Sends a message to the specified address.
+    /// Sends a message synchronously to the broker. This method is primarily used for non-durable
+    /// message delivery since it does not wait for a confirmation from the broker and operates
+    /// in a fire-and-forget manner.
     /// </summary>
+    /// <remarks>
+    /// This method should typically be used when message delivery speed is prioritized over reliability.
+    /// The message will be sent with 'at most once' delivery guarantee, as there's no acknowledgment
+    /// from the broker that the message has been received or persisted.
+    /// </remarks>
+    /// <param name="address">The address to which the message should be sent.</param>
+    /// <param name="routingType">
+    /// The routing type to use when sending the message. Ensures that this message is only routed to queues with matching routing type.
+    /// </param>
+    /// <param name="message">The message to send.</param>
+    void SendMessage(string address, RoutingType? routingType, Message message);
+
+    /// <summary>
+    /// Sends a message asynchronously to the broker. This method supports both durable and non-durable message
+    /// delivery modes, as specified by the message's durable property. It awaits for a confirmation
+    /// from the broker, ensuring that the message is either stored (for durable messages) or acknowledged
+    /// (for non-durable messages) before completing.
+    /// </summary>
+    /// <remarks>
+    /// This method should be used when reliability is required, and it supports awaiting the acknowledgment
+    /// from the broker. The delivery semantics are 'at least once' for durable messages, where the broker
+    /// confirms the persistence of the message. For non-durable messages, the completion of the task
+    /// indicates that the broker has received the message.
+    /// </remarks>
     /// <param name="address">The address to which the message should be sent.</param>
     /// <param name="routingType">
     /// The routing type to use when sending the message. Ensures that this message is only routed to queues with matching routing type.

test/ArtemisNetCoreClient.Tests/AnonymousProducerSpec.cs

@@ -227,4 +227,52 @@ await consumer.ReceiveMessageAsync(testFixture.CancellationToken)
             });
         });
     }
+
+    [Fact]
+    public async Task Should_send_message_to_specific_address_in_a_fire_and_forget_manner()
+    {
+        await using var testFixture = await TestFixture.CreateAsync(testOutputHelper);
+        var scenario = TestScenarioFactory.Default(new XUnitOutputAdapter(testOutputHelper));
+
+        await using var connection = await testFixture.CreateConnectionAsync();
+        await using var session = await connection.CreateSessionAsync();
+
+        var (addressName, queueName) = await scenario.Step("Create address and queue", async () =>
+        {
+            var addressName = await testFixture.CreateAddressAsync(RoutingType.Anycast);
+            var queueName = await testFixture.CreateQueueAsync(addressName, RoutingType.Anycast);
+            return (addressName, queueName);
+        });
+
+        await scenario.Step("Send a message in a fire-and-forget manner", async () =>
+        {
+            await using var producer = await session.CreateAnonymousProducerAsync(testFixture.CancellationToken);
+
+            // ReSharper disable once MethodHasAsyncOverload
+            producer.SendMessage(address: addressName, routingType: RoutingType.Anycast, message: new Message
+            {
+                Body = "fire_and_forget_msg"u8.ToArray(),
+            });
+        });
+
+        await scenario.Step("Confirm message count (one message should be available on the queue)", async () =>
+        {
+            await RetryUtil.RetryUntil(
+                func: () => session.GetQueueInfoAsync(queueName, testFixture.CancellationToken),
+                until: info => info?.MessageCount == 1,
+                cancellationToken: testFixture.CancellationToken
+            );
+        });
+
+        await scenario.Step("Verify message payload", async () =>
+        {
+            await using var consumer = await session.CreateConsumerAsync(new ConsumerConfiguration
+            {
+                QueueName = queueName
+            }, testFixture.CancellationToken);
+            var message = await consumer.ReceiveMessageAsync(testFixture.CancellationToken);
+            Assert.NotNull(message);
+            Assert.Equal("fire_and_forget_msg"u8.ToArray(), message.Body.ToArray());
+        });
+    }    
 }