set rabbitmq use durable queue.

src/DotNetCore.CAP.RabbitMQ/CAP.RabbiMQOptions.cs

@@ -1,4 +1,6 @@
-// ReSharper disable once CheckNamespace
+using System;
+
+// ReSharper disable once CheckNamespace
 namespace DotNetCore.CAP
 {
     public class RabbitMQOptions
@@ -76,5 +78,10 @@ namespace DotNetCore.CAP
         /// The port to connect on.
         /// </summary>
         public int Port { get; set; } = -1;
+
+        /// <summary>
+        /// Gets or sets queue message automatic deletion time. Default 10 days.
+        /// </summary>
+        public TimeSpan XMessageTTL { get; set; } = TimeSpan.FromDays(10);
     }
 }

src/DotNetCore.CAP.RabbitMQ/RabbitMQConsumerClient.cs

@@ -49,7 +49,11 @@ namespace DotNetCore.CAP.RabbitMQ
             _connection = _connectionFactory.CreateConnection();
             _channel = _connection.CreateModel();
             _channel.ExchangeDeclare(exchange: _exchageName, type: RabbitMQOptions.ExchangeType);
-            _channel.QueueDeclare(_queueName, exclusive: false);
+            _channel.QueueDeclare(_queueName,
+                durable: true,
+                exclusive: false,
+                autoDelete: false,
+                arguments: new Dictionary<string, object> { { "message-ttl", _rabbitMQOptions.XMessageTTL.TotalMilliseconds } });
         }
 
         public void Subscribe(IEnumerable<string> topics)