| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Agent M <agentm(at)themactionfaction(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Protocol Message Graph |
| Date: | 2006-04-23 22:43:30 |
| Message-ID: | 20060423224330.GI4775@surnet.cl |
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| Lists: | pgsql-hackers |
Agent M wrote:
> I have created a directed graph using graphviz that shows the message
> flow/event stream. Perhaps this will be helpful to someone. Of course,
> corrections are also welcome.
Interesting. I'm not sure how to read the graph however -- for example
what does it mean to have ReadyForQuery in both a rectangle and an
ellipse? What do the standalone boxes mean? (e.g. the SSLRequest and
CancelRequest? and why are they wrapped in two boxes? why
Close/CloseComplete appear from nowhere and they don't lead anywhere?)
Maybe it would make more sense to have a graph of states, and the edges
would indicate what messages are sent to change from one state to
another.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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