i've actually had issues with this:::
say in one class I reference a singleton like this:
var s = MySingelton.getInstance();
s.doSomeMethod();
then in another class I reference it like this:
MySingleton.getInstance().doSomeMethod();
it created unexpected results where it wouldn't work using the first
way. So our team has standardized always using the second method..
heres here I do singletons:
class SomeSingleton
{
//singleton instance
private static var inst:SomeSingleton;
//constructor
private function SomeSingleton()
{
init()
}
//initialize
private function init():Void
{
//some code
}
//singleton access
public static function getInstance():SomeSingleton
{
if( inst != null )
return inst;
return inst = new SomeSingleton();
}
//test method
public function someMethod():String
{
//some code
//call like: SomeSingleton.getInstance().someMethod();
return "Called some Method";
}
}
On Feb 20, 2006, at 12:08 PM, Manuel Saint-Victor wrote:
Okay- so when I'm calling my getInstance(); shouldn't any info I
retrieve
about properties on my Singleton be the same even if they are
dynamically
updated. For example- I have a class that contains a Netstream
object inside
my Singleton and I wold think that from any timeline I could create a
reference--> an instance of my class -->and then request
myNetStream.time.
But this just gets me a bunch of zeros despite the fact that
another tracer
from within that class is tracing out all kinds of other numbers for
myNetStream time's value.
I've been having several situations where I'm wondering if I'm losing
references when another object is calling my getInstance() or
something
weird like that
M
On 2/20/06, Judah <[EMAIL PROTECTED]> wrote:
That's what I love about this list. The stuff I learn is
invaluable. :)
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Ian Thomas
Sent: Monday, February 20, 2006 12:52 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Re: When singletons go bad
If you use getInstance(), a constructor gets called - which is
often handy
if you need to run any kind of initialisation code for your singleton
(that
you couldn't just do with initial property values).
If you just used statics, you might end up having to do something
like:
public static function doSomething()
{
if (!_initialised)
{
_initialiseMe();
}
// Do whatever this function is supposed to.
}
for every function that cared about the initialisation. Which is a
pain.
I often pre-emptively use getInstance in case I need to go back
and add
any
sort of initialisation to a class later on. If it's clearly a
utility only
class (for example, string utilities, math utilities - just a
collection
of
helper functions in a class) then I tend to use purely statics.
Cheers,
Ian
On 2/20/06, JesterXL <[EMAIL PROTECTED]> wrote:
He can, but every other progammer (well, ok, mainly Java
developers) are
familiar with the getInstance convention. It clearly illustrates
that
the
class is a Singleton.
I only use it when my boss says to; otherwise, static all the way
baby.
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