Notify web service client

[Nathan]

I am looking into using web services within a new framework I am putting
together and can see the benefit of being able to use a web service to
provide access to system by clients.

As part of the design I would like to implement the observer pattern from
the client so that they do not have to keep querying the web services to see
if an update had occurred, rather the web service would advise them.

Is this possible with a web service or do I need to look at RSS or similar?

Thanks

[Marvin Smit]

Hi,

yes... its possible. Its just the reverse of your current
client->server architecture.. Make your client also a server
(HttpListener for instance). Which accepts incomming 'notifications'
from the 'other server' you are expecting the updates from.

Another option is to use remoting and have remotable events.

Hope this helps,

Marvin Smit.
On Mon, 10 Oct 2005 01:31:01 -0700, Nathan
<Na****@discussions.microsoft.com> wrote:

I am looking into using web services within a new framework I am putting
together and can see the benefit of being able to use a web service to
provide access to system by clients.

As part of the design I would like to implement the observer pattern from
the client so that they do not have to keep querying the web services to see
if an update had occurred, rather the web service would advise them.

Is this possible with a web service or do I need to look at RSS or similar?

Thanks

[Nathan]

Thanks for that Marvin, hadn't considered reversing the architecture I reckon
that will do it.

"Marvin Smit" wrote:

Hi,

yes... its possible. Its just the reverse of your current
client->server architecture.. Make your client also a server
(HttpListener for instance). Which accepts incomming 'notifications'
from the 'other server' you are expecting the updates from.

Another option is to use remoting and have remotable events.

Hope this helps,

Marvin Smit.
On Mon, 10 Oct 2005 01:31:01 -0700, Nathan
<Na****@discussions.microsoft.com> wrote:

I am looking into using web services within a new framework I am putting
together and can see the benefit of being able to use a web service to
provide access to system by clients.

As part of the design I would like to implement the observer pattern from
the client so that they do not have to keep querying the web services to see
if an update had occurred, rather the web service would advise them.

Is this possible with a web service or do I need to look at RSS or similar?

Thanks

[DWS]

Nathan,
Here's a late reply,
No polling on this solution either and it doesn't require you to defend
another atack surface in your app. Asyncronously call the begin method of
the webservice the web service will reply to the delegate code keeping your
ui thread clear.

Good Luck
DWS
"Nathan" wrote:

I am looking into using web services within a new framework I am putting
together and can see the benefit of being able to use a web service to
provide access to system by clients.

As part of the design I would like to implement the observer pattern from
the client so that they do not have to keep querying the web services to see
if an update had occurred, rather the web service would advise them.

Is this possible with a web service or do I need to look at RSS or similar?

Thanks

[Nathan]

Thanks for that, at least I now have a couple of solutions I can look at.

"DWS" wrote:

Nathan,
Here's a late reply,
No polling on this solution either and it doesn't require you to defend
another atack surface in your app. Asyncronously call the begin method of
the webservice the web service will reply to the delegate code keeping your
ui thread clear.

Good Luck
DWS
"Nathan" wrote:

I am looking into using web services within a new framework I am putting
together and can see the benefit of being able to use a web service to
provide access to system by clients.

As part of the design I would like to implement the observer pattern from
the client so that they do not have to keep querying the web services to see
if an update had occurred, rather the web service would advise them.

Is this possible with a web service or do I need to look at RSS or similar?

Thanks