Re: Pushing data from the server to the client
From: DW (dddddwwwww_at_hotmail.com)
Date: 02/15/05
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Date: Mon, 14 Feb 2005 20:19:48 -0500
RCS,
Can you "subscribe" to a Java webservice using a delegate and a callback and
have data pushed from the Java webservice to your client? Thanks.
- David
"RCS" <rseder@gmail.com> wrote in message
news:VHgOd.3725$hU7.428@newssvr33.news.prodigy.com...
> First thing that comes to mind, is I'd consider having a TcpServer on your
> client that listens.. have your server connect and send it a command -
> like "UPDATE" when there is a change. When your client recieves that, it
> hits your web service or uses remoting. Seems like you could use a
> publish/subscribe pattern here too - but *how* is the tricky part. Because
> I assume you need real-time - and that's what makes it funny. If you are
> doing this on a per-security basis, that is going to be BRUTAL, on the
> server, on your app and on the network.
>
> But also, I am willing to bet you are using delayed quotes, because
> real-time quotes are super-expensive and difficult to get at
> programatically (from my experience) but delayed quotes you can get from
> anywhere, and if you are a brokerage firm, you even have a few options no
> doubt.
>
> If that's the case, why not just have a cache of prices locally and just
> go get updates every few minutes? That way, you will always have
> information on the client machine, and it's never any older than
> lastcheck + originaldelay.. so say if you check every 2 minutes and your
> original quotes are delayed 20 minutes, the data is never older than 22
> minutes, sometimes less.??
>
> And as far as Java vs. .NET web services - I had the pleasure recently to
> see textbook technology at work - we use a vendor, they wrote a web
> service that I didn't have access to yet (because of infrastructure
> issues). They gave me the .wsdl file for the web service (which was
> written in Java). So I mocked up a facade web service on my side in .NET
> that had this interface and wrote to it. I developed to that interface for
> a couple months and the consumer was all in .NET (C#)!!
>
> On the day when I could finally access thier web service, I literally just
> changed the URL from my facade, to point to them and it worked perfectly
> right away, and has continued to work ever since.
>
> So having a .NET or Java web service as your back-end should be completely
> invisble to you.
>
> Remoting doesn't sound like a reasonable idea because you'd have to have
> the remoting dll on each client machine and the stub on the server. The
> connection management of Remoting is almost non-existent, so it's very
> difficult to manage "what" your application is doing over the wire or over
> in the client app. There is also quite a bit of overhead per connection
> with Remoting, so you'd also have a practical limit based on CPU and RAM
> of your server..
>
> HTH..
>
>
> "DW" <dddddwwwww@hotmail.com> wrote in message
> news:PZ-dneahRaTC9pTfRVn-2Q@rcn.net...
>> Hi,
>>
>> Here is my question. I want to push security prices to the desktop from
>> the server. Whenever there is a new price in the database, the server
>> notifies the client. How can this be done in the following situations
>> using MS .NET Winforms on the desktop:
>>
>> 1. Using .NET Web Services on server
>>
>> 2. Using Java Web Services on server
>>
>> 3. Using .NET Remoting on server
>>
>> Thanks.
>>
>> - David W.
>>
>
>
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