General Purpose Transactions

[T. Onoma]

I was writing a piece a code where I needed to change a few object attributes, call a method, then reset those attributes to what they were. And it occured to me that it might be nice to have general purpose tranactions.


anobject = AClass.new
anobject.attrib = 'set'
transaction do
anobject.attrib = 'temp'
anobject.amethod
end
p anobject.attrib # => 'set'


Seems like there may already be a simple way to do this, but it's not coming to mind.

-t0

[Gavin Sinclair]

On Friday, November 14, 2003, 11:30:26 AM, T. wrote:

> I was writing a piece a code where I needed to change a few object attributes, call a method, then reset those attributes to what they were. And it occured to me that it might be nice to have
> general purpose tranactions.

> anobject = AClass.new
> anobject.attrib = 'set'
> transaction do
> anobject.attrib = 'temp'
> anobject.amethod
> end
> p anobject.attrib # => 'set'

> Seems like there may already be a simple way to do this, but it's not coming to mind.

Austin Ziegler's Transaction::Simple will help, with slightly
different semantics, I think. Search the RAA for it.

Gavin

[Ara.T.Howard]

On Fri, 14 Nov 2003, T. Onoma wrote:

> Date: Fri, 14 Nov 2003 09:30:26 +0900
> From: T. Onoma <transami@runbox.com>
> Newsgroups: comp.lang.ruby
> Subject: General Purpose Transactions
>
> I was writing a piece a code where I needed to change a few object attributes, call a method, then reset those attributes to what they were. And it occured to me that it might be nice to have general purpose tranactions.
>
>
> anobject = AClass.new
> anobject.attrib = 'set'
> transaction do
> anobject.attrib = 'temp'
> anobject.amethod
> end
> p anobject.attrib # => 'set'
>
>
> Seems like there may already be a simple way to do this, but it's not coming to mind.

austin's transaction::simple (RAA) does this. also, there's always:

begin
org = obj and obj = Marshal.load(Marshal.dump(obj))
obj.parm = 42
obj.method()
ensure
obj = org
end

-a
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