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| layout: default |
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| :source-highlighter: coderay |
| :icons: font |
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| include::_banner.adoc[] |
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| == Request/Reply (I ask, you answer) |
| |
| image::../reqrep.png[I ask, you answer] |
| |
| Request/Reply is used for synchronous communications where each question |
| is responded with a single answer, for example remote procedure calls (RPCs). |
| Like <<pipeline#,Pipeline>>, it also can perform load-balancing. This |
| is the only reliable messaging pattern in the suite, as it automatically |
| will retry if a request is not matched with a response. |
| |
| .reqprep.c |
| [source,c] |
| ---- |
| include::src/reqrep.c[] |
| ---- |
| <1> Blithely assumes message is ASCIIZ string. Real code should check it. |
| |
| .Compilation |
| [source,bash] |
| ---- |
| gcc reqrep.c -lnng -o reqrep |
| ---- |
| |
| .Execution |
| [source,bash] |
| ---- |
| include::src/reqrep.sh[] |
| ---- |
| |
| .Output |
| ---- |
| include::src/reqrep.out[] |
| ---- |
