From: | Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> |
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To: | PG-JDBC Mailing List <pgsql-jdbc(at)postgresql(dot)org> |
Subject: | Re: Cheapest way to poll for notifications? & Driver improvement question re SSL and notify |
Date: | 2009-12-21 13:44:00 |
Message-ID: | 4B2F7BA0.4080106@postnewspapers.com.au |
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Lists: | pgsql-general pgsql-jdbc |
(Re-sent, this time to the list)
On 21/12/2009 9:13 PM, rsmogura(at)softperience(dot)pl wrote:
> I haven't seen 1.4.2 JDK for ages :), but there is method
> javax.net.ssl.SSLSocketFactory.createSocket that takes as the 1st argument
> plain socket, there is no need to "forgot" plain socket (and it can be
> used, actually it's used for SSL communication with lazy handshake
> FTPS/SMTPS...).
That's how the PgJDBC driver works - it wraps an existing socket in an
SSLSocket when SSL negotiation begins. Pg always begins with a plain
text connection - it doesn't have a separate SSL port - so it has to
begin with a plaintext connection and then request SSL negotiation using
a plaintext message.
> Unfortunatly plainSocket can have some available bytes, but sslsoket.read
> can return EOF. But this was i saw on SUN JDK is that read(new byte[0]) on
> SSL socket causes process plain data.
I'm pretty sure it also blocks if there's nothing to read. You'd have to
run that in a background thread to force processing of any pending data
by the SSL engine. If you're going to do that, you may as well just have
a dedicated background thread to do all the reading from the socket...
--
Craig Ringer
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