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]

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]

Date: Fri, 14 Nov 2003 09:30:26 +0900
From: T. Onoma <[email protected]>
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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