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| include::banner.adoc[] |
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| == Survey (Everybody Votes) |
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| image::../survey.png[Everybody Votes] |
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| The surveyor pattern is used to send a timed survey out, responses |
| are individually returned until the survey has expired. This pattern |
| is useful for service discovery and voting algorithms. |
| |
| .survey.c |
| [source,c] |
| ---- |
| include::src/survey.c[] |
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| <1> Blithely assumes message is ASCIIZ string. Real code should check it. |
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| .Compilation |
| [source,bash] |
| ---- |
| gcc survey.c -lnng -o survey |
| ---- |
| |
| .Execution |
| [source,bash] |
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| include::src/survey.sh[] |
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| <1> The first survey times out with no responses because the clients aren’t connected yet. |
| |
| .Output |
| ---- |
| include::src/survey.out[] |
| ---- |
