[Instant message] Use asp.net + jquery to implement the comet instant message mechanism

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The client connection status and message status are managed through background threads.

Webconfig Configuration

 

 

<Deleetask>
<Add key = "IntervalTime" value = "10000"/> Interval
<Add key = "HasDB" value = "N"> </add> whether to query database system information
<Add key = "ConnectInterval" value = "4000"> </add> connection Interval

</AppSettings>

 

 

 

<HttpHandlers>

<Add verb = "POST" path = "ChatChannelHandler. ashx" type = "MDS. Comet. ChatChannelHandler, Comet"/> send messages
<Add verb = "*" path = "ChatHandler. ashx" type = "MDS. Comet. ChatHandler, Comet" validate = "false"/> AJAX round robin
</HttpHandlers>

 

1.asp.net

When the customer segment is connected for the first time

ThreadPool. RegisterWaitForSingleObject (client. EventWaitHandle, new System. Threading. WaitOrTimerCallback (WaitOrTimerCallback), client, ConnectInterval, true) adds a function that can be periodically executed to the thread pool,

Set

Public AutoResetEvent EventWaitHandle = new AutoResetEvent (false );

Client. EventWaitHandle

To send messages to the client immediately, and use this function to achieve persistent connections between the client and ensure the client's sustainability.

 

 

 

2. AJAX round robin

 

 

Ajax

Function SetParameters (p, pSplit)
{
Var option = {length: '20140901', title: '', help: 'none '};
Properties = p. split (pSplit );
For (I = 0; I <properties. length; I ++)
{
Namevalue = properties [I]. split (':');
If (namevalue. length> 1)
{
Execute = "option." + namevalue [0] + '= \ ''+ namevalue [1] + '\';';
Eval (execute );
}
}
Return option;
}

Function CometClient (handler, publicToken, privateToken, onmessage, ontimeout, oncancelled, onerror)
{
This. lastMessageId = 1000;
This. publicToken = publicToken;
This. privateToken = privateToken;
This. handler = handler;
This. onmessage = onmessage;
This. ontimeout = ontimeout;
This. oncancelled = oncancelled;
This. onerror = onerror;
This. running = true;
}

CometClient. prototype. stopWaiting = function ()
{
This. running = false;
}

CometClient. prototype. startWaiting = function ()
{
This. running = true;
This. waitForMessages ();
}

CometClient. prototype. waitForMessages = function ()
{
Var me = this;

$. Ajax (
{
Url: this. handler,
Type: "POST ",
Data: {privateToken: this. privateToken, lastMessageId: this. lastMessageId },
Success: function (response)
{
Var messages = null;
If (response! = Null & response! = "")
{
 
Messages = SetParameters (response ,";");
}
If (messages! = Null & messages. length> 0)
{
Var keepWaiting = me. running;
For (var I = 0; I <1; I ++)
{
If (me. lastMessageId <messages. MessageId)
Me. lastMessageId = messages. MessageId;

Switch (messages. Name. toLowerCase ())
{
Case "timedout ":
Me. ontimeout ();
Break;
Case "canceled ":
KeepWaiting = false;
Me. oncancelled ();
Break;
Case "message ":
Me. onmessage (messages );
Break;
}
}
If (keepWaiting)
Me. waitForMessages ();
}
},
Error: function ()
{
Me. onerror ();
}
});
}

 

Download DEMO code

 

 

Download the code COMET. DLL that implements persistent connection.

 

 

Another Implementation Method

FluorineFx + Flex is implemented as follows.

Http://ftp-woody.d134.6266668.cn/chat2.aspx