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Show Bid Request

.NET Messaging Web Service
Bid Request Id: 33742
Bookmark in my 'To Do' list
Posted by: QUIET (19 ratings)
(Software buyer rating 9.95)
Non-action Ratio: Very Good - 18.92%
Buyer Security Verifications: Excellent
Approved on: Nov 3, 2002
10:15:57 AM EDT
Bidding Closes: Nov 17, 2002
10:18:11 AM EDT
Viewed (by coders): 243 times
Deadline: 12/1/2002
100% of work completed and accepted. Coder has been paid.
Max Accepted Bid: Bidding is closed
Project Type: Small Business Project: $100 (USD) +
Bidding Type: Open Auction
Categories: Windows, Database, Java, C#
Enter chat room for this bid request
(0 active users at Jul 12, 2003 7:17:06 AM EDT)

details in enclosed doc

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request.

3) Complete ownership and distribution copyrights to all work purchased.

.NET j# or c#

Must be 100% finished and received by buyer on:
Dec 1, 2002 EDT
Deadline legal notes: All times are expressed in the time zone of the site EDT (UT - 5). If the buyer omitted a time, then the deadline is 11:59:59 PM EDT on the indicated date.

Special Conditions / Other:
Communication must happen 3 times a week with code attached or contract will be canceled.

Additional Files:
This bid request includes IMPORTANT additional attached files. Please download and read fully before bidding.

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Name   Bid Amount 
Date   Coder Rating  
Chris Cavanagh
(2 ratings)
in Stockport, Cheshire
United Kingdom
Bid id: 372,196
N/A Nov 3, 2002
2:37:28 PM EDT

I'd have no problem implementing this, but I have a few concerns:

  • There could be problems transmitting to clients on a WAN if they're behind a firewall or NAT.  Ports may be restricted, or the internal IP may be unreachable.
  • The servers could quickly become a bottleneck.  Message senders would have to block/wait until the server had finished its transmit attempt.  The more clients were registered, the worse performance would get.
  • Server resources could be wasted trying to transmit to unavailable clients.
  • When a client is sent a point message, it must explicitly consume it.
  • The specification is a little vague about what happens to unconsumed point messages.

Is there a reason you need a 'push' mechanism?  It might be worth considering a polling approach something like this:

  • Client registers with server and receives unique cookie
  • Client periodically calls a 'GetMessages' webmethod on the server, passing its cookie.
  • If unconsumed messages exist, they're returned to the client in a single XML collection and marked as consumed on the server (or deleted?)
  • The server would maintain a reference to the client's 'last received' broadcast message (it's easy to identify which broadcast messages have been received by everyone, and are safe for deletion).

This could resolve the potential issues highlighted above.  Performance on the server would be better as sent messages would simply be stored in the database (effectively queued until a client retrieves them).  Clients would need to do a little work in polling, but in comparison the server could put its feet up and relax.  Deployment to clients would be simpler; there'd be no need to set up a listener for inbound messages.

I've previously implemented a similar messaging subsystem (albeit polling-based, with a single server).  It exceeded our expectations and was used for everything from locking mechanisms to audit trails!

Hope this is of some use.  If I'm barking up the wrong tree, please let me know!



  See 1 private reply(ies)
to/from Chris Cavanagh.

This bid was accepted by the buyer!
Chris Cavanagh
(2 ratings)
in Stockport, Cheshire
United Kingdom
Bid id: 373,659
$250 (USD) Nov 4, 2002
4:35:10 PM EDT
Implementing pull mechanism as described in my comment.

There are more things we'd need to discuss, but I'm happy to wait until my bid's accepted/rejected :o)

What database server would be available? If it's still undefined, might be worth considering MSDE as it's freely deployable.
  See 4 private reply(ies)
to/from Chris Cavanagh.

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