《Windows Azure Platform 系列文章目錄》html
在以前的Azure Service Bus中,咱們已經介紹了Service Bus 隊列(Queue)的基本概念。前端
在本章中,筆者將介紹如何使用Visual Studio 2013,開發一個Service Bus Queue的Demo Project。後端
場景:ide
1.在前端有一個ASP.NET頁面,客戶從輸入框輸入數據,而且經過按鈕進行提交函數
2.輸入框輸入的數據,會被後端的WorkerRoleWithSBQueue接受處理,並在後端顯示post
主要步驟有:網站
1.使用Azure Management Portal,建立Service Busurl
2.修改Web Role邏輯spa
3.建立Cloud Project,添加Web Role和Service Bus Worker Role3d
4.配置WebRole和ServiceBusWorkerRole
3.DEMO
一.筆者已經在以前的文章中,介紹如何建立Service Bus了。不熟悉的讀者,能夠參考Windows Azure Service Bus (2) 隊列(Queue)入門
二.建立Cloud Project
1.首先咱們以管理員身份,運行VS2013
2.建立一個新的Cloud Service,命名爲LeiServiceBusQueue,以下圖:
3.增長ASP.NET Web Role和Worker Role with Service Bus Queue。以下圖
二.設置WorkerRoleWithSBQueue1
1.在WorkerRoleWithSBQueue1項目中,修改WorkerRole.cs代碼,以下:
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類代碼中,分爲兩個邏輯:
(1)OnStart函數,表示WorkerRole在啓動的時候,初始化了ProcessingQueue對象
(2)Run函數,表示在WorkerRole在執行的時候,將ProcessingQueue的內容輸出
三.設置Web Role
1.在Web Role的根目錄下,建立一個新的ASPX頁面,重命名爲ServiceBusQueue.aspx
在ServiceBusQueue.aspx頁面中,
- 增長一個TextBox控件,重命名爲txbInput
- 增長一個Button控件,重命名爲BtnSend
2.在WebRole1項目中,增長NuGet,添加ServiceBus引用。以下圖:
3.在ServiceBusQueue.aspx.cs中,增長以下代碼
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); } } }
上面的代碼中,會將用戶從界面的輸入值,插入到ProcessingQueue對象中
四.配置WebRole和ServiceBusWorkerRole
咱們修改WebRole的配置文件,以下圖:
在WebRole1的Settings中,點擊Add Setting增長Microsoft.ServiceBus.ConnectionString對象,以下圖:
上圖中,須要將Value值修改成咱們在Azure Management Portal中建立的ServiceBus鏈接字符串,以下圖:
修改完畢後,咱們須要修改ServiceBusWorkerRole的配置文件
將Microsoft.ServiceBus.ConnectionString的Value屬性,修改成咱們在Azure Management Portal中建立的ServiceBus鏈接字符串。以下圖:
五.而後咱們用Visual Studio的Azure模擬器運行。
咱們依次在ServiceBusQueue.aspx中,輸入不一樣的值。以下圖:
咱們能夠在Azure Compute模擬器中,查看到2次輸入的結果。以下圖:
能夠觀察到,首先輸入的值,最早被處理。這也說明了Service Bus Queue 先進先出的特性。
最後咱們還能夠在Management Portal中,查看到由代碼生成的processingqueue對象
=====================================分隔符=======================================================
看到最後,若是有讀者以爲,從Azure Compute Emulator查看到aspx頁面的輸入,這也太不智能啦。
放心,其實咱們能夠將aspx頁面的輸入,返回到另外的ReturnQueue對象中去,並在前端aspx進行顯示:
(1)ProcessingQueue:插入(Send)數據
(2)ProcessingQueue:返回(Receive)數據
別問我爲何不能保存到代碼中申明的ProcessingQueue中,筆者試驗過,不能對ProcessingQueue同時執行Send和Receive操做
ServiceBusQueue.aspx.cs代碼以下
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代碼以下:
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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