1ZACTOR(3)                         CZMQ Manual                        ZACTOR(3)
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NAME

6       zactor - Class for simple actor framework
7

SYNOPSIS

9       //  This is a stable class, and may not change except for emergencies. It
10       //  is provided in stable builds.
11       //  This class has draft methods, which may change over time. They are not
12       //  in stable releases, by default. Use --enable-drafts to enable.
13       // Actors get a pipe and arguments from caller
14       typedef void (zactor_fn) (
15           zsock_t *pipe, void *args);
16
17       //  Create a new actor passing arbitrary arguments reference.
18       CZMQ_EXPORT zactor_t *
19           zactor_new (zactor_fn task, void *args);
20
21       //  Destroy an actor.
22       CZMQ_EXPORT void
23           zactor_destroy (zactor_t **self_p);
24
25       //  Send a zmsg message to the actor, take ownership of the message
26       //  and destroy when it has been sent.
27       CZMQ_EXPORT int
28           zactor_send (zactor_t *self, zmsg_t **msg_p);
29
30       //  Receive a zmsg message from the actor. Returns NULL if the actor
31       //  was interrupted before the message could be received, or if there
32       //  was a timeout on the actor.
33       //  Caller owns return value and must destroy it when done.
34       CZMQ_EXPORT zmsg_t *
35           zactor_recv (zactor_t *self);
36
37       //  Probe the supplied object, and report if it looks like a zactor_t.
38       CZMQ_EXPORT bool
39           zactor_is (void *self);
40
41       //  Probe the supplied reference. If it looks like a zactor_t instance,
42       //  return the underlying libzmq actor handle; else if it looks like
43       //  a libzmq actor handle, return the supplied value.
44       CZMQ_EXPORT void *
45           zactor_resolve (void *self);
46
47       //  Return the actor's zsock handle. Use this when you absolutely need
48       //  to work with the zsock instance rather than the actor.
49       CZMQ_EXPORT zsock_t *
50           zactor_sock (zactor_t *self);
51
52       //  Self test of this class.
53       CZMQ_EXPORT void
54           zactor_test (bool verbose);
55
56       #ifdef CZMQ_BUILD_DRAFT_API
57       // Function to be called on zactor_destroy. Default behavior is to send zmsg_t with string "$TERM" in a first frame.
58       //
59       // An example - to send $KTHXBAI string
60       //
61       //     if (zstr_send (self, "$KTHXBAI") == 0)
62       //         zsock_wait (self);
63       typedef void (zactor_destructor_fn) (
64           zactor_t *self);
65
66       //  *** Draft method, for development use, may change without warning ***
67       //  Change default destructor by custom function. Actor MUST be able to handle new message instead of default $TERM.
68       CZMQ_EXPORT void
69           zactor_set_destructor (zactor_t *self, zactor_destructor_fn destructor);
70
71       #endif // CZMQ_BUILD_DRAFT_API
72       Please add '@interface' section in './../src/zactor.c'.
73

DESCRIPTION

75       The zactor class provides a simple actor framework. It replaces the
76       CZMQ zthread class, which had a complex API that did not fit the CLASS
77       standard. A CZMQ actor is implemented as a thread plus a PAIR-PAIR
78       pipe. The constructor and destructor are always synchronized, so the
79       caller can be sure all resources are created, and destroyed, when these
80       calls complete. (This solves a major problem with zthread, that a
81       caller could not be sure when a child thread had finished.)
82
83       A zactor_t instance acts like a zsock_t and you can pass it to any CZMQ
84       method that would take a zsock_t argument, including methods in zframe,
85       zmsg, zstr, and zpoller. (zloop somehow escaped and needs catching.)
86
87       An actor function MUST call zsock_signal (pipe) when initialized and
88       MUST listen to pipe and exit on $TERM command.
89
90       Please add @discuss section in ./../src/zactor.c.
91

EXAMPLE

93       From zactor_test method.
94
95           zactor_t *actor = zactor_new (echo_actor, "Hello, World");
96           assert (actor);
97           zstr_sendx (actor, "ECHO", "This is a string", NULL);
98           char *string = zstr_recv (actor);
99           assert (streq (string, "This is a string"));
100           freen (string);
101           zactor_destroy (&actor);
102
103           // custom destructor
104           // KTHXBAI_actor ends on "$KTHXBAI" string
105           zactor_t *KTHXBAI = zactor_new (KTHXBAI_actor, NULL);
106           assert (KTHXBAI);
107           // which is the one sent by KTHXBAI_destructor
108           zactor_set_destructor (KTHXBAI, KTHXBAI_destructor);
109           zactor_destroy (&KTHXBAI);
110
111           // custom destructor
112           // destructor using bsend/brecv
113           zactor_t *BSEND = zactor_new (BSEND_actor, NULL);
114           assert (BSEND);
115           zactor_set_destructor (BSEND, BSEND_destructor);
116           zactor_destroy (&BSEND);
117           #if defined (__WINDOWS__)
118           zsys_shutdown();
119           #endif
120
121

AUTHORS

123       The czmq manual was written by the authors in the AUTHORS file.
124

RESOURCES

126       Main web site:
127
128       Report bugs to the email <zeromq-dev@lists.zeromq.org[1]>
129
131       Copyright (c) the Contributors as noted in the AUTHORS file. This file
132       is part of CZMQ, the high-level C binding for 0MQ:
133       http://czmq.zeromq.org. This Source Code Form is subject to the terms
134       of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
135       distributed with this file, You can obtain one at
136       http://mozilla.org/MPL/2.0/. LICENSE included with the czmq
137       distribution.
138

NOTES

140        1. zeromq-dev@lists.zeromq.org
141           mailto:zeromq-dev@lists.zeromq.org
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145CZMQ 4.2.1                        10/31/2019                         ZACTOR(3)
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