[zeromq-dev] Event-driven publish-subscribe model

[Rajalakshmi Iyer]

Hello,

I am working on a requirement whereby a process (say producer) needs to
send out one-way messages to a variable number of processes (say consumers).

The publish-subscribe model seemed good for this because the consumers will
subscribe to messages from the producer. I tried using ZeroMQ to achieve
this.

However, I have a few problems with it:

   1.

   The consumers have to continuously poll for messages. I would have the
   consumers to be notified when there is a new message.
   2.

   There is a possibility of the producer queue being filled up. I would
   have liked the producer to remove messages from the queue based on some
   condition (say remove messages older than 5 seconds, or remove messages
   that have been read 5 times). I see ZMQ recommends using a HWM, but I would
   like more selective removal of elements from the buffer.
   3.

   Since the consumers are polling and the messages are not removed from
   the queue, the consumers see duplicate messages till a new message comes
   in. I want the consumer to be notified only once per new message.

I understand I may be using a wrong model (publish-subscribe may not be
suitable). I have thought about using request-reply, but that doesn't work
since the producer does not want to keep track of the number of consumers.

Can anyone suggest a good alternative?

Thanks in advance!

Raj

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