On 02/23/2016 11:15 AM, Alan Conway wrote:
Direction of message flow is tricky to describe in router
configuration. "in" and "out", "sender" and "receiver" all have
opposite meaning depending on whether you are thinking from a router or
client perspective.
Here's what I would propose based on the existing use of "in" and "out"
in the linkRoutePattern configuration. This is the opposite of how I
usually think of "in" and "out" but I suspect this is a 50/50 issue
where it doesn't matter which we pick as long as we pick one.
Note I'm using "relay" to mean router-initiated links, which currently
means waypoints and link-routes.
=======================
Directional terminology
=======================
Connections: can be established to the router (via listeners) or from
the router (via connectors) The direction that the connection was made
has no effect on how it can be used.
If you run "qdstat -c" against a running router, it shows the
connections with a direction. "In" means the connection was established
inbound to the router (via a listener). "Out" means the connection was
established outbound (via a connector).
The direction is expressed from the perspective of the router, not the
connected endpoints.
Links opened from outside the router are "client" links. Links opened
by the router are "relay" links.
Links that receive messages from the router network are called *in*
links because messages flow from the network *into* a client or are
relayed *into* an external system.
Links that send messages *to* the router network are called "out" links
because messages flow *out* of clients or external systems to the
network.
The opposite is the case. Again if you use "qdstat -l", it shows link
direction from the perspective of the router. "In" links carry message
deliveries into the router (are senders from the perspective of the
endpoint). "Out" links carry messages outbound from the router.
Shout if I've got this wrong or if anyone has ideas for less ambiguous
terms than in/out or send/receive.
The interesting points are 1) in which direction was the connection/link
established, and 2) in which direction does the link carry message
deliveries. Perhaps there are better terms for established-inbound,
flow-incoming, etc.
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