Hi Kevin,
Thanks for the clarification!
Best regards,
John
On 16.10.2020 14.39, Kevin Sapper wrote:
Hi John,
* SHALL create a queue when initiating an outgoing connection to
a subscriber, and SHALL maintain the queue whether or not the
connection is established.
This action is taken when a SUB socket binds to an address and the PUB
socket connects to it.
* SHALL create a queue when a subscriber connects to it. If this
subscriber disconnects, the PUB socket SHALL destroy its queue
and SHALL discard any messages it contains.
This action is taken when a PUB socket binds to an address and the SUB
socket connects to it.
What is the difference between initiating an outgoing connection
to a subscriber and a subscriber connecting to a publisher? In the
C++ source code of my system, a publisher binds to a PUB socket
and a subscriber connects to the address of a publisher. I guess
this sounds more like the second point, but I'm not certain.
Yes, the second point!
Did I understand correctly that this message queue between a
publisher and a subscriber works FIFO? It says that for outgoing
messages, "SHALL silently drop the message if the queue for a
subscriber is full." Does this imply that those messages that fit
in the queue are delivered in the order they were sent in? I take
it that the queue being full means that the high water mark has
been exceeded.
When a PUB socket enters the mute state due to having reached the high
water mark for a subscriber, then any messages that would be sent to
the subscriber in question shall instead be dropped until the mute
state ends. The send function does never block for this socket type.
What is a binary comparison? Is it the same as bitwise comparison?
To me, "binary comparison" sounds like just comparing two things
with each other.
It means that the byte content of the first frame is compared against
the bytes of a subscription. Hence a subscription can use any binary
prefix not just characters.
//Kevin
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