Re: Pushing data from the server to the client

From: RCS (rseder_at_gmail.com)
Date: 02/15/05 

Date: Tue, 15 Feb 2005 19:59:52 GMT

I don't think this will be fundamentally work - mainly because http is
connectionless and assumes no connection other than right at the moment of a
request. So I believe that you can't have a http-based "push" technology,
it'd have to be your own version (like the other "push" technologies have
been).

You COULD completely do this in sockets (.net network libraries), just not
with HTTP I believe

"DW" <dddddwwwww@hotmail.com> wrote in message
news:4NednbAN2oi_04zfRVn-jg@rcn.net...
> 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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