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How do I re-initialize a class during runtime?

( #57484=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Feb 10, 2001 at 01:30 UTC
Q&A  > object-oriented programming


Description:

Let's say I've loaded a class during compile/run time, and sometime during my program, I want to re-load that class because its source has changed, and use it some more. I doubt it would work, but I tried to put a

 use PeopleClass;

in the middle of my program. Needless to say, I think it pulled the older "PeopleClass" from memory and used it. Any comments, answers?

Answer: How do I re-initialize a class during runtime?
contributed by tadman

You might just want to save the state of your program to a file and re-spawn a new copy of self with this new data. Consider:

if (ClassFileChanged()) { my ($state_file) = SaveToStateFile(); if (!RespawnFromStateFile($state_file)) # I.E. 0 == no +error { exit(0); } else { warn "Could not reload $0 properly.\n"; } }
This will prevent you from crashing your program if you break your class file (i.e. typo, compile error, etc.) and it will give you a chance to fix it properly.

Of course, if you're inside of mod_perl, calling exit(0) will be futile, since mod_perl doesn't care about that sort of stuff and will just call the same program again for the next request.
Answer: How do I re-initialize a class during runtime?
contributed by Trinary

This was answered by myself and a bunch of other folks earlier today. =)

Trinary

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