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Diffstat (limited to 'doc/zmq_device.txt')
| -rw-r--r-- | doc/zmq_device.txt | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/doc/zmq_device.txt b/doc/zmq_device.txt index e18d2af..45d4052 100644 --- a/doc/zmq_device.txt +++ b/doc/zmq_device.txt @@ -31,16 +31,13 @@ Before calling _zmq_device()_ you must set any socket options, and connect or bind both frontend and backend sockets. The two conventional device models are: -*proxy*:: - bind frontend socket to an endpoint, and connect backend socket to - downstream components. A proxy device model does not require changes to - the downstream topology but that topology is static (any changes require - reconfiguring the device). -*broker*:: - bind frontend socket to one endpoint and bind backend socket to a second - endpoint. Downstream components must now connect into the device. A - broker device model allows a dynamic downstream topology (components can - come and go at any time). +* proxy model - accept inward connections to frontend socket (by binding it to + an endpoint), and make onward connections through backend socket (connecting + to endpoints on other nodes). A proxy device model can fit well into an + existing topology. +* broker model - accept connections on both frontend and backend sockets (by + binding both to endpoints). A broker device model creates a star topology + where nodes can come and go at any time. _zmq_device()_ runs in the current thread and returns only if/when the current context is closed. @@ -112,6 +109,21 @@ assert (zmq_bind (backend, "tcp://*:5556") == 0); zmq_device (ZMQ_QUEUE, frontend, backend); ---- +.Creating a pubsub proxy +---- +// Create frontend and backend sockets +void *frontend = zmq_socket (context, ZMQ_SUB); +assert (backend); +void *backend = zmq_socket (context, ZMQ_PUB); +assert (frontend); +// Connect frontend to publisher +assert (zmq_bind (frontend, "tcp://192.68.55.112:4444") == 0); +// Bind backend to TCP port +assert (zmq_bind (backend, "tcp://*:5556") == 0); +// Start a forwarder device +zmq_device (ZMQ_FORWARDER, frontend, backend); +---- + SEE ALSO -------- |