Enhance RabbitMQ to set PrefetchCount

docs/en/Background-Jobs-RabbitMq.md

@@ -126,25 +126,31 @@ By default, all the job types use the `Default` RabbitMQ connection.
 Configure<AbpRabbitMqBackgroundJobOptions>(options =>
 {
     options.DefaultQueueNamePrefix = "my_app_jobs.";
+    options.DefaultDelayedQueueNamePrefix = "my_app_jobs.delayed"
+    options.PrefetchCount = 1;
     options.JobQueues[typeof(EmailSendingArgs)] =
         new JobQueueConfiguration(
             typeof(EmailSendingArgs),
             queueName: "my_app_jobs.emails",
-            connectionName: "SecondConnection"
+            connectionName: "SecondConnection",
+            delayedQueueName:"my_app_jobs.emails.delayed"
         );
 });
 ````
 
-* This example sets the default queue name prefix to `my_app_jobs.`. If different applications use the same RabbitMQ server, it would be important to use different prefixes for each application to not consume jobs of each other.
+* This example sets the default queue name prefix to `my_app_jobs.` and default delayed queue name prefix to `my_app_jobs.delayed`. If different applications use the same RabbitMQ server, it would be important to use different prefixes for each application to not consume jobs of each other.
+* Sets `PrefetchCount` for all queues.
 * Also specifies a different connection string for the `EmailSendingArgs`.
 
 `JobQueueConfiguration` class has some additional options in its constructor;
 
 * `queueName`: The queue name that is used for this job. The prefix is not added, so you need to specify the full name of the queue.
+* `DelayedQueueName`: The delayed queue name that is used for delayed execution of job. The prefix is not added, so you need to specify the full name of the queue.
 * `connectionName`: The RabbitMQ connection name (see the connection configuration above). This is optional and the default value is `Default`.
 * `durable` (optional, default: `true`).
 * `exclusive` (optional, default: `false`).
-* `autoDelete` (optional, default: `false`)
+* `autoDelete` (optional, default: `false`).
+* `PrefetchCount` (optional, default: null)
 
 See the RabbitMQ documentation if you want to understand the `durable`, `exclusive` and `autoDelete` options better, while most of the times the default configuration is what you want. 
 

docs/en/Distributed-Event-Bus-RabbitMQ-Integration.md

@@ -141,13 +141,14 @@ Configure<AbpRabbitMqOptions>(options =>
 });
 ````
 
-**Example: Configure the client and exchange names**
+**Example: Configure the client, exchange names and prefetchCount**
 
 ````csharp
 Configure<AbpRabbitMqEventBusOptions>(options =>
 {
     options.ClientName = "TestApp1";
     options.ExchangeName = "TestMessages";
+    options.PrefetchCount = 1;
 });
 ````
 

docs/zh-Hans/Background-Jobs-RabbitMq.md

@@ -126,25 +126,31 @@ Configure<AbpRabbitMqOptions>(options =>
 Configure<AbpRabbitMqBackgroundJobOptions>(options =>
 {
     options.DefaultQueueNamePrefix = "my_app_jobs.";
+    options.DefaultDelayedQueueNamePrefix = "my_app_jobs.delayed"
+    options.PrefetchCount = 1;
     options.JobQueues[typeof(EmailSendingArgs)] =
         new JobQueueConfiguration(
             typeof(EmailSendingArgs),
             queueName: "my_app_jobs.emails",
-            connectionName: "SecondConnection"
+            connectionName: "SecondConnection",
+            delayedQueueName:"my_app_jobs.emails.delayed"
         );
 });
 ```
 
-- 这个示例将默认的队列名前缀设置为 `my_app_jobs.`,如果多个项目都使用的同一个 RabbitMQ 服务,设置不同的前缀可以避免执行其他项目的后台作业.
+- 这个示例将默认的队列名前缀设置为 `my_app_jobs.`并且设置默认的延迟队列名为 `my_app_jobs.delayed`,如果多个项目都使用的同一个 RabbitMQ 服务,设置不同的前缀可以避免执行其他项目的后台作业.
+- 设置了预取数量, 用于所有队列.
 - 这里还设置了 `EmailSendingArgs` 绑定的 RabbitMQ 连接.
 
 `JobQueueConfiguration` 类的构造函数中,还有一些其他的可选参数.
 
 - `queueName`: 指定后台作业对应的队列名称(全名).
+* `DelayedQueueName`: 指定后台延迟执行的作业对于的队列名称(全名).
 - `connectionName`: 后台作业对应的 RabbitMQ 连接名称,默认是 `Default`.
 - `durable`: 可选参数,默认为 `true`.
 - `exclusive`: 可选参数,默认为 `false`.
 - `autoDelete`: 可选参数,默认为 `false`.
+* `PrefetchCount` (可选参数, 默认为: null)
 
 如果你想要更多地了解 `durable`,`exclusive`,`autoDelete` 的用法,请阅读 RabbitMQ 提供的文档.
 

docs/zh-Hans/Distributed-Event-Bus-RabbitMQ-Integration.md

@@ -141,13 +141,14 @@ Configure<AbpRabbitMqOptions>(options =>
 });
 ````
 
-**示例: 配置客户端和交换机名称**
+**示例: 配置客户端,交换机名称和预取数量**
 
 ````csharp
 Configure<AbpRabbitMqEventBusOptions>(options =>
 {
     options.ClientName = "TestApp1";
     options.ExchangeName = "TestMessages";
+    options.PrefetchCount = 1;
 });
 ````
 

framework/src/Volo.Abp.BackgroundJobs.RabbitMQ/Volo/Abp/BackgroundJobs/RabbitMQ/AbpRabbitMqBackgroundJobOptions.cs

@@ -19,6 +19,8 @@ public class AbpRabbitMqBackgroundJobOptions
     /// Default value: "AbpBackgroundJobsDelayed."
     /// </summary>
     public string DefaultDelayedQueueNamePrefix { get; set; }
+
+    public ushort? PrefetchCount { get; set; }
 
     public AbpRabbitMqBackgroundJobOptions()
     {

framework/src/Volo.Abp.BackgroundJobs.RabbitMQ/Volo/Abp/BackgroundJobs/RabbitMQ/JobQueue.cs

@@ -66,7 +66,8 @@ protected virtual JobQueueConfiguration GetOrCreateJobQueueConfiguration()
                new JobQueueConfiguration(
                    typeof(TArgs),
                    AbpRabbitMqBackgroundJobOptions.DefaultQueueNamePrefix + JobConfiguration.JobName,
-                   AbpRabbitMqBackgroundJobOptions.DefaultDelayedQueueNamePrefix + JobConfiguration.JobName
+                   AbpRabbitMqBackgroundJobOptions.DefaultDelayedQueueNamePrefix + JobConfiguration.JobName,
+                   prefetchCount: AbpRabbitMqBackgroundJobOptions.PrefetchCount
                );
     }
 
@@ -140,9 +141,14 @@ protected virtual Task EnsureInitializedAsync()
 
         if (AbpBackgroundJobOptions.IsJobExecutionEnabled)
         {
+            if (QueueConfiguration.PrefetchCount.HasValue)
+            {
+                ChannelAccessor.Channel.BasicQos(0, QueueConfiguration.PrefetchCount.Value, false);
+            }
+
             Consumer = new AsyncEventingBasicConsumer(ChannelAccessor.Channel);
             Consumer.Received += MessageReceived;
-
+            
             //TODO: What BasicConsume returns?
             ChannelAccessor.Channel.BasicConsume(
                 queue: QueueConfiguration.QueueName,

framework/src/Volo.Abp.BackgroundJobs.RabbitMQ/Volo/Abp/BackgroundJobs/RabbitMQ/JobQueueConfiguration.cs

@@ -20,12 +20,14 @@ public JobQueueConfiguration(
         string connectionName = null,
         bool durable = true,
         bool exclusive = false,
-        bool autoDelete = false)
+        bool autoDelete = false,
+        ushort? prefetchCount = null)
         : base(
             queueName,
             durable,
             exclusive,
-            autoDelete)
+            autoDelete,
+            prefetchCount)
     {
         JobArgsType = jobArgsType;
         ConnectionName = connectionName;

framework/src/Volo.Abp.EventBus.RabbitMQ/Volo/Abp/EventBus/RabbitMq/AbpRabbitMqEventBusOptions.cs

@@ -13,6 +13,8 @@ public class AbpRabbitMqEventBusOptions
     public string ExchangeName { get; set; }
 
     public string ExchangeType { get; set; }
+
+    public ushort? PrefetchCount { get; set; }
 
     public string GetExchangeTypeOrDefault()
     {

framework/src/Volo.Abp.EventBus.RabbitMQ/Volo/Abp/EventBus/RabbitMq/RabbitMqDistributedEventBus.cs

@@ -78,7 +78,8 @@ public void Initialize()
                 AbpRabbitMqEventBusOptions.ClientName,
                 durable: true,
                 exclusive: false,
-                autoDelete: false
+                autoDelete: false,
+                prefetchCount: AbpRabbitMqEventBusOptions.PrefetchCount
             ),
             AbpRabbitMqEventBusOptions.ConnectionName
         );

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/QueueDeclareConfiguration.cs

@@ -13,20 +13,24 @@ public class QueueDeclareConfiguration
     public bool Exclusive { get; set; }
 
     public bool AutoDelete { get; set; }
+
+    public ushort? PrefetchCount { get; set; } 
 
     public IDictionary<string, object> Arguments { get; }
 
     public QueueDeclareConfiguration(
         [NotNull] string queueName,
         bool durable = true,
         bool exclusive = false,
-        bool autoDelete = false)
+        bool autoDelete = false,
+        ushort? prefetchCount = null)
     {
         QueueName = queueName;
         Durable = durable;
         Exclusive = exclusive;
         AutoDelete = autoDelete;
         Arguments = new Dictionary<string, object>();
+        PrefetchCount = prefetchCount;
     }
 
     public virtual QueueDeclareOk Declare(IModel channel)

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/RabbitMqMessageConsumer.cs

@@ -165,9 +165,14 @@ protected virtual async Task TryCreateChannelAsync()
                 arguments: Queue.Arguments
             );
 
+            if (Queue.PrefetchCount.HasValue)
+            {
+                Channel.BasicQos(0, Queue.PrefetchCount.Value, false);
+            }
+
             var consumer = new AsyncEventingBasicConsumer(Channel);
             consumer.Received += HandleIncomingMessageAsync;
-
+            
             Channel.BasicConsume(
                 queue: Queue.QueueName,
                 autoAck: false,