Re: Adding code to a Perl program without stopping it


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Re: Adding code to a Perl program without stopping it

by TomDLux (Vicar)

on Mar 27, 2011 at 16:40 UTC ( [id://895773]=note: print w/replies, xml )

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in reply to Adding code to a Perl program without stopping it

If you're running on Unix, you can send a signal (kill) which your process catches. The signal handler reads a file which contains a list of modules and versions which should be loaded, and compares those with what actually is loaded, and loads / reloads the missing ones.

On the other hand, loading your whiz-bang "Divide-by-zero" module is little benefit if there are no calls to it.

As Occam said: Entia non sunt multiplicanda praeter necessitatem.

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Re^2: Adding code to a Perl program without stopping it
by GrandFather (Saint) on Mar 27, 2011 at 20:04 UTC

if there are no calls to it

which is why when you use the delete $INC{...}/require technique you generally either only update a set of known volotile modules, or you use a registration processes with a known entry point in the modules.

I use the registration technique to add new task handlers to a distributed task handling system that provides automated build and testing services. It allows me to add or correct task handlers without restarting (currently) six systems.

True laziness is hard work

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