Andrew,
Sure... from what I've seen of the singleton pattern in other languages,
the implementation we use (I didn't build it) is a lot easier.
This is essentially how it works:
1. Created a central method called "getSingleton" that manages the
creation and retrieval of singletons.
any getSingleton(string componentPath)
2. The getSingleton method checks to see if a key matching the
componentPath exists within a struct stored in application scope.
a) If the key doesn't exist, then a new key is inserted into the
struct, and its value is the instantiated component (with appropriate
locking).
b) The persistent instance of the component is returned.
That is essentially how it works.
Darryl
[EMAIL PROTECTED] wrote on 01/03/2005 09:00:51 AM:
> Daryl,
>
> I have been trying to understand how the singleton pattern could be
applied
> to CF, would you be able to elaborate more on this or give an example of
how
> its applied. Not just for me, but for others out there that would like
to
> know as well.
>
> I understand how it works in C#, Java, but for some reason can't get my
head
> around how it could be applied to CF, maybe its just me missing
something.
>
>
> Regards
> Andrew Scott
> Technical Consultant
>
> NuSphere Pty Ltd
> Level 2/33 Bank Street
> South Melbourne, Victoria, 3205
>
> Phone: 03 9686 0485 - Fax: 03 9699 7976
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Darryl
Lyons
> Sent: Tuesday, 1 March 2005 9:52 AM
> To: CFAussie Mailing List
> Subject: [cfaussie] Re: CFCs calling CFCs
>
> Barry,
>
> Singletons are cool - it is amazing what a difference application or
session
> scoped singletons make to performance, especially in models where
methods
> and components are reused a lot.
>
> Darryl Lyons
>
> [EMAIL PROTECTED] wrote on 01/03/2005 08:40:40
AM:
>
> >
> > Kay,
> >
> > we do something similar to Darryl & co (passing in a reference to the
> > helper object in the init of the main object, and using singletons too
> > for the same reason) but I'm not sure whether Fusebox4 could squeeze
> > in this idea..
> >
> > the thinking was, thanx to complex "objects" (ie CFC's) being passed
> > byRef, what looks like decorating the main CFC with extra
> > functionality is actually providing a pointer to the "helper" CFC
> >
> > more here:
> > http://www.mail-archive.com/[email protected]/msg06886.html
> >
> >
> > just a thought
> > barry.b
> >
>
>
>
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