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  《Windows Azure Platform 系列文章目录

    

  在之前的Azure Service Bus中,我们已经介绍了Service Bus 队列(Queue)的基本概念。

  在本章中,笔者将介绍如何使用Visual Studio 2013,开发一个Service Bus Queue的Demo Project。

  

  场景:

  1.在前端有一个ASP.NET页面,客户从输入框输入数据,并且通过按钮进行提交

  2.输入框输入的数据,会被后端的WorkerRoleWithSBQueue接受处理,并在后端显示

  

  主要步骤有:

  1.使用Azure Management Portal,创建Service Bus

  2.修改Web Role逻辑

  3.创建Cloud Project,添加Web Role和Service Bus Worker Role

  4.配置WebRole和ServiceBusWorkerRole

  3.DEMO

 

 

  一.笔者已经在之前的文章中,介绍如何创建Service Bus了。不熟悉的读者,可以参考Windows Azure Service Bus (2) 队列(Queue)入门

  

  二.创建Cloud Project

  1.首先我们以管理员身份,运行VS2013

  2.创建一个新的Cloud Service,命名为LeiServiceBusQueue,如下图:

  

  3.增加ASP.NET Web RoleWorker Role with Service Bus Queue。如下图

  

   

 

 

  二.设置WorkerRoleWithSBQueue1

  1.在WorkerRoleWithSBQueue1项目中,修改WorkerRole.cs代码,如下:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Threading;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.ServiceRuntime;

namespace WorkerRoleWithSBQueue1
{
    public class WorkerRole : RoleEntryPoint
    {
        // The name of your queue
        const string QueueName = "ProcessingQueue";// QueueClient is thread-safe. Recommended that you cache 
        // rather than recreating it on every request
        QueueClient Client;
        ManualResetEvent CompletedEvent = new ManualResetEvent(false);

        public override void Run()
        {
            Trace.WriteLine("Starting processing of messages");

            // Initiates the message pump and callback is invoked for each message that is received, calling close on the client will stop the pump.
            Client.OnMessage((receivedMessage) =>
                {
                    try
                    {
                        // Process the message
                        Trace.WriteLine("Processing Service Bus message: " + receivedMessage.SequenceNumber.ToString());

                        string received = receivedMessage.GetBody<string>();
                        Trace.WriteLine("You input is" + received);
                    }
                    catch
                    {
                        // Handle any message processing specific exceptions here
                    }
                });

            CompletedEvent.WaitOne();
        }
    
  
     public override bool OnStart() { // Set the maximum number of concurrent connections ServicePointManager.DefaultConnectionLimit = 12; // Create the queue if it does not exist already string connectionString = CloudConfigurationManager.GetSetting("Microsoft.ServiceBus.ConnectionString"); var namespaceManager = NamespaceManager.CreateFromConnectionString(connectionString); if (!namespaceManager.QueueExists(QueueName)) { namespaceManager.CreateQueue(QueueName); }// Initialize the connection to Service Bus Queue Client = QueueClient.CreateFromConnectionString(connectionString, QueueName); return base.OnStart(); } public override void OnStop() { // Close the connection to Service Bus Queue Client.Close(); CompletedEvent.Set(); base.OnStop(); } } }

 

  在上面的WokerRole.cs类代码中,分为两个逻辑:

  (1)OnStart函数,表示WorkerRole在启动的时候,初始化了ProcessingQueue对象

  (2)Run函数,表示在WorkerRole在执行的时候,将ProcessingQueue的内容输出

 

 

 

  三.设置Web Role

  1.在Web Role的根目录下,创建一个新的ASPX页面,重命名为ServiceBusQueue.aspx

  在ServiceBusQueue.aspx页面中,

  -  增加一个TextBox控件,重命名为txbInput

  -  增加一个Button控件,重命名为BtnSend

  2.在WebRole1项目中,增加NuGet,添加ServiceBus引用。如下图:

  

  3.在ServiceBusQueue.aspx.cs中,增加如下代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using Microsoft.WindowsAzure;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;

namespace WebRole1
{
    public partial class ServiceBusQueue : System.Web.UI.Page
    {
        const string QueueName = "ProcessingQueue";

     protected void Page_Load(object sender, EventArgs e) { } protected void BtnSend_Click(object sender, EventArgs e) { string strinput = txbInput.Text.ToString(); Send(strinput); txbInput.Text = string.Empty; } private void Send(string text) { string connectionString = CloudConfigurationManager.GetSetting("Microsoft.ServiceBus.ConnectionString"); MessagingFactory factory = MessagingFactory.CreateFromConnectionString(connectionString); // Initialize the connection to Service Bus Queue MessageSender sender = factory.CreateMessageSender(QueueName); BrokeredMessage message1 = new BrokeredMessage(text); sender.Send(message1); } } }

  上面的代码中,会将用户从界面的输入值,插入到ProcessingQueue对象中

 

 

 

  四.配置WebRole和ServiceBusWorkerRole

  我们修改WebRole的配置文件,如下图:

  

  在WebRole1的Settings中,点击Add Setting增加Microsoft.ServiceBus.ConnectionString对象,如下图:

  

  上图中,需要将Value值修改为我们在Azure Management Portal中创建的ServiceBus连接字符串,如下图:

  

 

  修改完毕后,我们需要修改ServiceBusWorkerRole的配置文件

  

  将Microsoft.ServiceBus.ConnectionString的Value属性,修改为我们在Azure Management Portal中创建的ServiceBus连接字符串。如下图:

  

  

 

 

  五.然后我们用Visual Studio的Azure模拟器运行。

  我们依次在ServiceBusQueue.aspx中,输入不同的值。如下图:

                    

  我们可以在Azure Compute模拟器中,查看到2次输入的结果。如下图:

  

 

  可以观察到,首先输入的值,最先被处理。这也说明了Service Bus Queue 先进先出的特性。

 

  最后我们还可以在Management Portal中,查看到由代码生成的processingqueue对象

  

  

  

 

 

  =====================================分隔符=======================================================

 

  看到最后,如果有读者觉得,从Azure Compute Emulator查看到aspx页面的输入,这也太不智能啦。

  放心,其实我们可以将aspx页面的输入,返回到另外的ReturnQueue对象中去,并在前端aspx进行显示:

  (1)ProcessingQueue:插入(Send)数据

  (2)ProcessingQueue:返回(Receive)数据

 

  别问我为什么不能保存到代码中申明的ProcessingQueue中,笔者试验过,不能对ProcessingQueue同时执行Send和Receive操作

 

  ServiceBusQueue.aspx.cs代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using Microsoft.WindowsAzure;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;

namespace WebRole1
{
    public partial class ServiceBusQueue : System.Web.UI.Page
    {
        const string QueueName = "ProcessingQueue";
        const string ReturnQueueName = "ReturnQueue";
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void BtnSend_Click(object sender, EventArgs e)
        {
            string strinput = txbInput.Text.ToString();
            Send(strinput);
            txbInput.Text = string.Empty;
        }

        private void Send(string text)
        {
            string connectionString = CloudConfigurationManager.GetSetting("Microsoft.ServiceBus.ConnectionString");
            MessagingFactory factory = MessagingFactory.CreateFromConnectionString(connectionString);

            // Initialize the connection to Service Bus Queue
            MessageSender sender = factory.CreateMessageSender(QueueName);

            BrokeredMessage message1 = new BrokeredMessage(text);

            sender.Send(message1);

        }

        protected void btnReceiveMessage_Click(object sender, EventArgs e)
        {
           string connectionString = CloudConfigurationManager.GetSetting("Microsoft.ServiceBus.ConnectionString");
           QueueClient Client = QueueClient.CreateFromConnectionString(connectionString, ReturnQueueName);

           var message = Client.Receive(TimeSpan.FromSeconds(3));
           if (message != null)
           {
               var ret = message.GetBody<string>();
               message.Complete();


           }
        }
    }
}

 

  WorkerRole.cs代码如下:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Threading;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.ServiceRuntime;

namespace WorkerRoleWithSBQueue1
{
    public class WorkerRole : RoleEntryPoint
    {
        // The name of your queue
        const string QueueName = "ProcessingQueue";
        const string ReturnQueueName = "ReturnQueue";

        // QueueClient is thread-safe. Recommended that you cache 
        // rather than recreating it on every request
        QueueClient Client;
        ManualResetEvent CompletedEvent = new ManualResetEvent(false);

        public override void Run()
        {
            Trace.WriteLine("Starting processing of messages");

            // Initiates the message pump and callback is invoked for each message that is received, calling close on the client will stop the pump.
            Client.OnMessage((receivedMessage) =>
                {
                    try
                    {
                        // Process the message
                        Trace.WriteLine("Processing Service Bus message: " + receivedMessage.SequenceNumber.ToString());

                        string received = receivedMessage.GetBody<string>();
                        Trace.WriteLine("You input is" + received);

                        SendToReturnQueue(ReturnQueueName, received);
                    }
                    catch
                    {
                        // Handle any message processing specific exceptions here
                    }
                });

            CompletedEvent.WaitOne();
        }

        private void SendToReturnQueue(string queueName, string inputString)
        { 
            string connectionString = CloudConfigurationManager.GetSetting("Microsoft.ServiceBus.ConnectionString");
            MessagingFactory factory = MessagingFactory.CreateFromConnectionString(connectionString);

            // Initialize the connection to Service Bus Queue
            MessageSender sender = factory.CreateMessageSender(queueName);

            BrokeredMessage message1 = new BrokeredMessage(inputString);

            sender.Send(message1);

        }

        public override bool OnStart()
        {
            // Set the maximum number of concurrent connections 
            ServicePointManager.DefaultConnectionLimit = 12;

            // Create the queue if it does not exist already
            string connectionString = CloudConfigurationManager.GetSetting("Microsoft.ServiceBus.ConnectionString");
            var namespaceManager = NamespaceManager.CreateFromConnectionString(connectionString);
            if (!namespaceManager.QueueExists(QueueName))
            {
                namespaceManager.CreateQueue(QueueName);
            }
            if (!namespaceManager.QueueExists(ReturnQueueName))
            {
                namespaceManager.CreateQueue(ReturnQueueName);
            }

            // Initialize the connection to Service Bus Queue
            Client = QueueClient.CreateFromConnectionString(connectionString, QueueName);
            return base.OnStart();
        }

        public override void OnStop()
        {
            // Close the connection to Service Bus Queue
            Client.Close();
            CompletedEvent.Set();
            base.OnStop();
        }
    }
}

 

 

 

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posted on 2015-04-02 16:03 Lei Zhang的博客 阅读(...) 评论(...) 编辑 收藏