Hi,
I know there are several ways of saving ruby objects on files, but there is a simple way of saving ALL the
state of a Ruby program execution (or an irb work session) and then reload it in another execution (or session)?
In this way I could use Ruby as a sort of Persistent Programming Language (or Object Database Language).
Thanks!
Renzo Orsini (orsini@dsi.unive.it) a newbie to Ruby...
Renzo Orsini ha scritto:
Hi,
I know there are several ways of saving ruby objects on files, but there is a simple way of saving ALL the
state of a Ruby program execution (or an irb work session) and then reload it in another execution (or session)?In this way I could use Ruby as a sort of Persistent Programming Language (or Object Database Language).
well, using irb you have an hackish solution: you could do an eval of the history.
Look here[1] for some info on how you could get a persistent history beetween irb sessions. The next part is just re-evaluating it on startup.
Saving the state of the program would be hard since you can't serialize closures, singletons and continuations,
Oh, and welcome to ruby 
Renzo Orsini ha scritto:
Hi,
I know there are several ways of saving ruby objects on files, but there is a simple way of saving ALL the
state of a Ruby program execution (or an irb work session) and then reload it in another execution (or session)?
In this way I could use Ruby as a sort of Persistent Programming Language (or Object Database Language).well, using irb you have an hackish solution: you could do an eval of the history.
Look here[1] for some info on how you could get a persistent history beetween irb sessions. The next part is just re-evaluating it on startup.
This could be of some help, in effect, but only for simple cases.
Saving the state of the program would be hard since you can't serialize closures, singletons and continuations,
I would be happy just to save classes, objects and global variables that I have defined, or a subset of them, but it seems to me that with Marshal.dump I cannot even save a class
in irb:
irb(main):009:0> class C
irb(main):010:1> def m
irb(main):011:2> 3
irb(main):012:2> end
irb(main):013:1> end
=> nil
irb(main):014:0> Marshal.dump(C, File.new('f','w+'))
=> #<File:f>
then I quit, reload irb and
irb(main):001:0> Marshal.load(File.new('f'))
ArgumentError: undefined class/module C
from (irb):1:in `load'
from (irb):1
(I don't undestand the meaning of this message..., and also I read that a class is nothing more than an object...
Oh, and welcome to ruby
Thanks!
Renzo Orsini
On Jun 11, 2005, at 11:50, gabriele renzi wrote: