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<H1>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</LI>
<LI><em>From</em>: Vadim Tkachenko <<A HREF="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</A>></LI>
<LI><em>Date</em>: Tue, 24 Mar 1998 19:35:56 -0600</LI>
<LI><em>Sender</em>: <A HREF="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</A></LI>
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<PRE>
Matt Chatterley wrote:
>
> On Sun, 22 Mar 1998, Chris Gray wrote:
> > [Ben Greear:]
>
> [Snip]
>
> > :Also, as a java server, I don't think I can do a select on incomming
> > :data. I think a thread for every player is a bit much...any suggestions
> > :here?
> >
> > I have just started into the socket programming stuff of the current Java
> > book I'm reading, but I just went and did some scanning. The technique
> > he suggests for a server is to create some fixed number of threads, and
> > re-use those threads throughout the lifetime of the server. He says that
> > some Java implementations do not garbage collect threads at all, so having
> > one per connection can result in an eventual crash due to lack of memory.
> > Ick. Given the lack of a 'select' or 'poll' method in Java, the choices
> > are quite limited. Double ick.
>
> It is my understanding that (at least, according to the 1.1.x
> specifications), a Thread is terminated when its stop() method is called.
> Of course, some Java implementations may be buggy. :)
Surprisingly, they are :-))
Some things worth mentioning:
JDK 1.0.2: Thread.interrupt() doesn't work. Thread.stop() doesn't work
as expected if called from within the thread you want to stop.
Netscape Enterprise 3.* JVM: the same. BEWARE: it advertises itself as
JDK 1.1 compliant, but in fact hopelessly broken - apparently, these are
not the only things which don't work - my package which had been tested
on JDK 1.0.2 from different vendors for almost two years choke and died
at once.
JDK 1.2: Thread.stop() is deprecated - and let it rest in peace,
Thread.interrupt() is quite enough.
> Consider a model where you have a resizeable array (see the Vector class)
> of Threads. You also maintain a list of available threads so you do not
> have to recalulate it, and follow a procedure akin to:
>
> New connection is made to the server:
> Check list of available threads.
> If null: extend the Vector and add a new thread to handle the
> connection.
> If not null: take the 'top' thread and re-assign it.
>
> A connection closes:
> Add that thread to the list of available threads.
> Suspend and 'reset' the thread.
>
> Seems interesting anyway. :)
I wouldn't recommend messing with stopping and resuming threads, though
:-)
The better solution will be probably if you have some Thread-derived
class which works like this:
while ( isEnabled() )
{
Runnable
r = waitForRunRequest(); // blocking wait
r.run();
}
Of course, this is an extremely simplified scenario, which, BTW, fits
into the ChannelSwitcher concept I described in the previous message.
> -Matt Chatterley
--
Still alive and smile stays on,
Vadim Tkachenko <vt#freehold,crocodile.org>
--
UNIX _is_ user friendly, he's just very picky about who his friends are
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00822" HREF="msg00822.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Greg Munt <a href="mailto:greg#uni-corn,demon.co.uk">greg#uni-corn,demon.co.uk</a>, Sun 22 Mar 1998, 19:02 GMT
</LI>
<LI><strong><A NAME="00823" HREF="msg00823.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Matt Chatterley <a href="mailto:matt#mpc,dyn.ml.org">matt#mpc,dyn.ml.org</a>, Sun 22 Mar 1998, 19:19 GMT
<UL>
<LI><strong><A NAME="00852" HREF="msg00852.html">World Persistence, flat files v/s DB v/s ??</A></strong>,
s001gmu <a href="mailto:s001gmu#nova,wright.edu">s001gmu#nova,wright.edu</a>, Mon 23 Mar 1998, 19:51 GMT
<UL>
<LI><strong><A NAME="00884" HREF="msg00884.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Wed 25 Mar 1998, 05:23 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00885" HREF="msg00885.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Wed 25 Mar 1998, 05:26 GMT
<UL>
<LI><strong><A NAME="00894" HREF="msg00894.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Matt Chatterley <a href="mailto:matt#mpc,dyn.ml.org">matt#mpc,dyn.ml.org</a>, Wed 25 Mar 1998, 08:47 GMT
<UL>
<LI><strong><A NAME="00899" HREF="msg00899.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Thu 26 Mar 1998, 01:59 GMT
<UL>
<LI><strong><A NAME="00904" HREF="msg00904.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Joel Dillon <a href="mailto:emily#cornholio,new.ox.ac.uk">emily#cornholio,new.ox.ac.uk</a>, Thu 26 Mar 1998, 15:52 GMT
</LI>
</UL>
</LI>
</UL>
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</UL>
</LI>
</UL>
</LI>
<LI><strong><A NAME="00830" HREF="msg00830.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 22 Mar 1998, 21:10 GMT
</LI>
</ul>
</LI>
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