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| hs |
Hi
I am using the articles by Matt Powell about server side asynchronous web methods (as well as the client side article).
However i dont see any improvements to the speed of my application. I'm experiencing the
slow speed on the server side. I read that using a delegate to call an asynchronous method
would be ineffecient and maybe causing the problem. Can someone give me some advice on what
i can do to improve the speed without doing a complete rewrite (my code was based on a
synchronous piece).
Thanks
server side code
----------------
public delegate string ProcessMessageXML3AsyncStub(string asMessage);
public class MyState
{
public object previousState;
public ProcessMessageXML3AsyncStub asyncStub;
}
[WebMethod]
public IAsyncResult BeginProcessMessageXML3(string asMessage,AsyncCallback cb, object s)
{
ProcessMessageXML3AsyncStub stub = new ProcessMessageXML3AsyncStub(ProcessMessageXML3);
MyState ms = new MyState();
ms.previousState = s;
ms.asyncStub = stub;
return stub.BeginInvoke(asMessage, cb, ms);
}
[WebMethod]
public string EndProcessMessageXML3(IAsyncResult call)
{
MyState ms = (MyState)call.AsyncState;
return ms.asyncStub.EndInvoke(call);
}
public string ProcessMessageXML3(string asMessage)
{
// Go to database and fill datatable
OleDbConnection dbconn = new OleDbConnection("Provider=MSDAORA.1;User ID=SQL;Password=SQL;Data Source=TestDB");
OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM Table1", dbconn);
DataTable dt = new DataTable();
da.Fill(dt);
this.dt = dt;
if(dt.Rows.Count > 100)
{
Thread newThread = new Thread(new ThreadStart(this.CreateMoreThreads));
newThread.Start();
}
MemoryStream ms = CreateStream(this.dt, 0, 100);
// Do some more IO stuff
...
return "something";
}
private void CreateMoreThreads()
{
// Create even more threads depending on the number of records returned
// and do more IO stuff
}
Client side
-----------
private void button2_Click(object sender, System.EventArgs e)
{
this.webservice1 = new localhost.Service1();
this.ds = new DataSet();
AsyncCallback callback = new AsyncCallback(this.ServiceCallback);
this.webservice1.BeginProcessMessageXML3(textBox4.Text, callback, null);
}
private void ServiceCallback(IAsyncResult result)
{
localhost.Service1 ws = new localhost.Service1();
string s1 = ws.EndProcessMessageXML3(result);
object[] args = {s1};
this.Invoke(new ProcessStringDelegate(ProcessString), args);
}
public delegate void ProcessStringDelegate(string as1);
private void ProcessString(string as1)
{
// Process the string here
}
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| Tian Min Huang (VIP) |
Hello,
Thanks for your post. I reviewed your description and web methods
client/server code carefully, and now I'd like to share the following
information with you:
1. I believe that your design is good and efficient. I noticed that you
code is based on asynchronous web methods on both client and server sides.
It also seems to me that your client program is a WinForm application, and
I believe using a delegate to call the web method is a nice approach which
will not block the message thread for the client. That is, your application
is responsive while the web method is under processing (after user clicking
Button2). On the server side, it access Oracle database which is
time-consuming.
2. >> However i dont see any improvements to the speed of my application.
One reason why the asynchronous method call enables the performance is that
we can perform several tasks simultaneously. For example, your client
application is responsive and can perform other tasks when the web method
is processing on the remote system. If your application is just idle and
waiting for the delegate to be called, there is no difference between
synchronous and asynchronous method calls in terms of performance. It's of
the same case on server side, we are able to notice the performance
increase when there are several web methods calls coming in simultaneously.
Please feel free to let me know if you have any problems or concerns.
Have a nice day! :-)
Regards,
HuangTM
Microsoft Online Partner Support
MCSE/MCSD
Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
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| Tian Min Huang (VIP) |
Hi,
I am currently standing by for an update from you and would like to know
how things are going there. Should you have any questions or concerns on
the recent questions/ information I've posted, please don't hesitate to let
me know directly. It's my pleasure to be of assistance
Regards,
HuangTM
Microsoft Online Partner Support
MCSE/MCSD
Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
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