Chris, have you seen the Clone Pattern? http://zguide.zeromq.org/php:chapter5
Essentially it solves the ‘late joiner’ issue of PUB-SUB by providing a back channel using ROUTER-DEALER over which any missing data (or data history) can be requested and delivered. You might be able to come up with a way to use the back channel to co-ordinate your different customer entitlement. Possibly prepend all exchange rate data points on the PUB-SUB with a UUID, set the client to filter on the SUB socket by the UUID. The client gets knowledge of the correct UUID by requesting it over the ROUTER-DEALER at which point you verify that the client has entitlement before issuing. Or something? Stephen From: zeromq-dev [mailto:[email protected]] On Behalf Of Chris Catherall Sent: 13 December 2017 09:16 To: [email protected] Subject: [zeromq-dev] Streaming data Hi We are building an application which delivers currency exchange rates to customers over the web. The exchange rates come from an existing .net WCF Duplex service. And the rates are streamed for a period of 60 seconds over a tcp connection. i.e. constantly changing data (one or two updates per second), not a single request/response. Also, different pricing is applied depending on who the customer is, so it is not a single source of data. It is different for each customer. And so a new instance of the data stream is created for each incoming request. We are building a new API which would sit in front of the existing WCF service (and behind the website backend) and we are considering using Zero mq to distribute the rates. So it is server-to-server comms. (**Not** the browser to server part) I am trying to identify if I should use a stream socket http://hintjens.com/blog:42 Or if a simple REQ/REP pair would be fine. Or if there is some other pattern that is more appropriate. Some things I'm struggling with: Given the data is different for each request I presume I cant have a single RES server. I'd need to new one up for each incoming request? How would that work? Also, how would you then co-ordinate the correct data is returned to the correct client? Could the zeroMQ part be hosted inside an existing .net Web.api ? thanks for any advice ________________________________ This message may contain confidential or privileged information. If you have received this message in error, please immediately notify us by email at [email protected]<mailto:[email protected]> or by telephone before permanently deleting it. If you are not the intended recipient, do not use, copy or disclose the information contained in this message or in any attachment. The views expressed may not be the views of Moneycorp and should not be relied upon. Please note that Moneycorp monitors e-mails sent and/or received; further communication will signify your consent to this. Please be aware that emails and attachments may contain viruses. Unless expressly stated otherwise, none of the information contained in this email constitutes or should be construed as financial advice. No payment card information should be transmitted by email from or to Moneycorp beyond the first six and last four digits of any payment card (credit or debit card). In no circumstances should the card security code CVV (3 digit number on the reverse) be transmitted. TTT Moneycorp Limited (company number 738837) is registered in England. Its registered office is at Floor 5, Zig Zag Building, 70 Victoria Street, London, SW1E 6SQ<https://maps.google.com/?q=70+Victoria+Street,+London,+SW1E+6SQ&entry=gmail&source=g>. Moneycorp is a trading name of TTT Moneycorp Limited which is authorised and regulated by the Financial Conduct Authority for the provision of payment services (firm reference number 308919). -- Chris Sent from Gmail for IPhone
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