Comments on: A basic mutable state in an Erlang process http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/ Does any of it make any sense? Tue, 06 Jan 2009 08:24:35 +0000 http://wordpress.org/?v=2.0.2 by: Michael Campbell http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/#comment-6728 Wed, 29 Aug 2007 18:20:19 +0000 http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/#comment-6728 There's a section in Joe's book about code replacement, just before the introducing gen_server part. It was one of the (many) "ah-hah!" sections for me. There’s a section in Joe’s book about code replacement, just before the introducing gen_server part. It was one of the (many) “ah-hah!” sections for me.

]]> by: Tom http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/#comment-6633 Wed, 22 Aug 2007 20:30:31 +0000 http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/#comment-6633 Thank you Patrick. Dynamic upgrade is something I am looking forward to investigating (but I still have a huge amount to grok first). Thank you Patrick. Dynamic upgrade is something I am looking forward to investigating (but I still have a huge amount to grok first).

]]> by: Patrick Logan http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/#comment-6626 Wed, 22 Aug 2007 17:00:05 +0000 http://notwaving.net/wordpress/2007/08/20/a-basic-mutable-state-in-an-erlang-process/#comment-6626 Nicely explained. And if you call... basic:loop(X) % Fully qualified module:function name ...then the system will check for a new version of the basic module to load before calling loop. So you can upgrade the loop function while running if desired. One way to do that is have another message pattern looking for the atom 'upgrade' or some such. The message could include a magic token to indicate the sender is capable of sending the 'upgrade' message. Nicely explained.

And if you call…

basic:loop(X) % Fully qualified module:function name

…then the system will check for a new version of the basic module to load before calling loop. So you can upgrade the loop function while running if desired.

One way to do that is have another message pattern looking for the atom ‘upgrade’ or some such. The message could include a magic token to indicate the sender is capable of sending the ‘upgrade’ message.

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