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Man Pages

Manual Reference Pages  -  ZPROXY_V2 (3)

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zproxy_v2 - run a steerable proxy in the background (deprecated)



//  Constructor
//  Create a new zproxy object. You must create the frontend and backend
//  sockets, configure them, and connect or bind them, before you pass them
//  to the constructor. Do NOT use the sockets again, after passing them to
//  this method.
CZMQ_EXPORT zproxy_t *
    zproxy_new (zctx_t *ctx, void *frontend, void *backend);

// Destructor // Destroy a zproxy object; note this first stops the proxy. CZMQ_EXPORT void zproxy_destroy (zproxy_t **self_p);

// Copy all proxied messages to specified endpoint; if this is NULL, any // in-progress capturing will be stopped. You must already have bound the // endpoint to a PULL socket. CZMQ_EXPORT void zproxy_capture (zproxy_t *self, const char *endpoint);

// Pauses a zproxy object; a paused proxy will cease processing messages, // causing them to be queued up and potentially hit the high-water mark on // the frontend socket, causing messages to be dropped, or writing // applications to block. CZMQ_EXPORT void zproxy_pause (zproxy_t *self);

// Resume a zproxy object CZMQ_EXPORT void zproxy_resume (zproxy_t *self);

// Self test of this class CZMQ_EXPORT void zproxy_v2_test (bool verbose);


The zproxy class provides an equivalent to the ZMQ steerable proxy, on all versions of ZeroMQ.

This class is deprecated in CZMQ v3; it works together with zctx, zsocket, and other deprecated V2 classes. New applications should use the V3 zproxy interface, based on zactor, together with the zsock class for sockets.


From zproxy_v2_test method.

zctx_t *ctx = zctx_new ();
assert (ctx);
void *frontend = zsocket_new (ctx, ZMQ_PULL);
assert (frontend);
int rc = zsocket_bind (frontend, "inproc://frontend");
assert (rc == 0);
void *backend = zsocket_new (ctx, ZMQ_PUSH);
assert (backend);
rc = zsocket_bind (backend, "inproc://backend");
assert (rc == 0);
zproxy_t *proxy = zproxy_new (ctx, frontend, backend);
assert (proxy);

// Connect application sockets to proxy void *faucet = zsocket_new (ctx, ZMQ_PUSH); assert (faucet); rc = zsocket_connect (faucet, "inproc://frontend"); assert (rc == 0); void *sink = zsocket_new (ctx, ZMQ_PULL); assert (sink); rc = zsocket_connect (sink, "inproc://backend"); assert (rc == 0);

// Send some messages and check they arrived zstr_send (faucet, "Hello"); char *string = zstr_recv (sink); assert (streq (string, "Hello")); zstr_free (&string);

// Check pause/resume functionality zproxy_pause (proxy); zstr_send (faucet, "World");

zproxy_resume (proxy); string = zstr_recv (sink); assert (streq (string, "World")); zstr_free (&string);

// Create capture socket, must be a PULL socket void *capture = zsocket_new (ctx, ZMQ_PULL); assert (capture); rc = zsocket_bind (capture, "inproc://capture"); assert (rc == 0);

// Switch on capturing, check that it works zproxy_capture (proxy, "inproc://capture"); zstr_send (faucet, "Hello");

string = zstr_recv (sink); assert (streq (string, "Hello")); zstr_free (&string);

string = zstr_recv (capture); assert (streq (string, "Hello")); zstr_free (&string); zproxy_destroy (&proxy); zctx_destroy (&ctx);


The czmq manual was written by the authors in the AUTHORS file.


Main web site: \m[blue] \m[]

Report bugs to the email <\m[blue]\m[][1]>


Copyright (c) 1991-2012 iMatix Corporation -- Copyright other contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for 0MQ: This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at LICENSE included with the czmq distribution.


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CZMQ 3&.0&.1 ZPROXY_V2 (3) 06/01/2015

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