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From: Greg Sabino Mullane <greg@turnstep.com>
To: pgsql-hackers@postgresql.org
Cc: pgsql-interfaces@postgresql.org
Subject: Re: [HACKERS] Listen/Notify payload and interfaces
Date: Wed, 17 Feb 2010 18:04:14 -0000
Message-ID: <06fb833dde8748d07bb996c39d221bd8@biglumber.com> (raw)
In-Reply-To: <dc7b844e1002170039l3746253bt923c8ff716a12b5c@mail.gmail.com>


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> With the new listen/notify implementation we can send a payload along
> with the notification. This has been in the protocol already since
> years and there is no change needed for libpq. However we need to
> adapt the various interfaces to allow a payload to be sent and
> received.

DBD::Pg has been ready since 2008, if you need something to test with. :)

Usage is:

while (my $notify = $dbh->pg_notifies) {
  my ($name, $pid, $payload) = @$notify;
  print qq{I received notice "$name" from PID $pid, payload was "$payload"\n};                                            
}

Not sure what you mean by adapting interfaces to send payloads, I imagine 
most if not all simply require a NOTIFY to be sent via PQexec.

- -- 
Greg Sabino Mullane greg@turnstep.com
End Point Corporation http://www.endpoint.com/
PGP Key: 0x14964AC8 201002171302
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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