Server-to-client information push with AJAX+MSMQ (Message Queuing) +webservice

Demand:

Push to the client whenever the database has data updates

Soft demand:

1, the server resources are limited, the requirements of resource consumption as small as possible;

2, the project can be controlled, not to call third-party untrusted unstable method.

Existing examples:

1, 58 home Using the method is TCP long connection, the server pressure is large;

2, Redis, etc. to provide subscription push service, open source, but customized to the developer of their development language proficiency requirements, the author level does not reach

Final Solution:

Explain:

①② page Loads the first time the data is requested, returns data, loads, calls AJAX2

③ page load is the request, but there is no data at this time, so block, wait for other components insert Msg

④ after receiving new MSG, return value to Ajax2

⑤AJAX2 Call Ajax1

⑥AJAX1 Refreshing data

After block AJAX2 only consumes one thread on the server, resource consumption is minimal.

=================== below is the code =======================

1. File structure

2, RECEIVE.CS//MSMQ of the receiving class

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingsystem.messaging;namespacewebapplication1{ Public classReceive { PublicString receives () {varQueue =NewMessageQueue (@". \private$\msgqueue"); Queue. Formatter=NewXMLMessageFormatter (New string[] {"System.String" }                ); Message m=queue.            Receive (); returnm.body.tostring (); }    }}

2, send.cs//msmq of the transmission class

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingsystem.messaging;namespacewebapplication1{ Public classSend { Public stringCreate (String msg) {Try            {                if(! Messagequeue.exists (@". \private$\msgqueue") {messagequeue.create (@". \private$\msgqueue"); }                varQueue =NewMessageQueue (@". \private$\msgqueue"); Queue. Send (MSG,"Label"); return "OK"; }            Catch(Exception ex) {return "Error"; }        }    }}

3, mqgiver.asmx//Core WebService

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingSystem.Web.Services;usingWebApplication1;namespaceserver receives mq{/// <summary>    ///Summary description of Mqgiver/// </summary>[WebService (Namespace ="http://tempuri.org/")] [WebServiceBinding (ConformsTo=Wsiprofiles.basicprofile1_1)] [System.ComponentModel.ToolboxItem (false)]    //to allow the Web service to be called from the script using ASP. NET AJAX, uncomment the downstream. //[System.Web.Script.Services.ScriptService][Serializable] Public classMQGiver:System.Web.Services.WebService {[WebMethod] Public stringHelloWorld () {return "Hello World"; } [WebMethod] Public voidgivemsg () {Receive R=Newreceive (); String msg=r.receives (); String Json="{\ "msg\": \ ""+ msg +"\"}"; stringcallback = httpcontext.current.request["Jsoncallback"]; HttpContext.Current.Response.Write (Callback+"("+ Json +")"); } [WebMethod] Public voidGivedata () {String Json="{\ "msg\": \ "Ok\"}"; stringcallback = httpcontext.current.request["Jsoncallback"]; HttpContext.Current.Response.Write (Callback+"("+ Json +")"); }    }}

4. msgadd.aspx//simulation adds data to MSMQ

Front Code<%@ Page language="C #"autoeventwireup="true"Codebehind="MSGadd.aspx.cs"inherits="The server receives MQ. Msgadd"%><! DOCTYPE HTML Public"-//W3C//DTD XHTML 1.0 transitional//en" "HTTP://WWW.W3.ORG/TR/XHTML1/DTD/XHTML1-TRANSITIONAL.DTD">"http://www.w3.org/1999/xhtml">"Server"> <title></title>"Form1"runat="Server"> <div> </div> <asp:button id="Button1"runat="Server"onclick="Button1_Click"text="Button"/> <asp:textbox id="TextBox1"runat="Server"></asp:TextBox> <asp:label id="Label1"runat="Server"text="Label"></asp:Label> </form></body>//================================================Background CodeusingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingWebApplication1;namespaceserver receives mq{ Public Partial classMSGadd:System.Web.UI.Page {protected voidPage_Load (Objectsender, EventArgs e) {        }        protected voidButton1_Click (Objectsender, EventArgs e) {Send S=NewSend (); Label1.Text=s.create (TextBox1.Text); }    }}

5. Call interface

"Jq.js"></script>"Text/javascript">function GetData () {$.ajax ({URL:"http://localhost:55843/MQGiver.asmx/GiveData?jsoncallback=?", DataType:"Jsonp", Success:onsuccess,}); function onsuccess (JSON) {$ ("#la"). Text (json.msg) getmsg (); }} function getmsg () {$.ajax ({URL:"http://localhost:55843/MQGiver.asmx/GiveMsg?jsoncallback=?", DataType:"Jsonp", Success:onsuccess1,});        function OnSuccess1 (json1) {GetData ();    }} getdata (); </script> <label id="La"> </label></body>
The whole project is like this, has been through, there are good suggestions and questions welcome message!
Server-to-client information push with AJAX+MSMQ (Message Queuing) +webservice