RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
That's true enough, and the latter part is also true.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]

> -Original Message-
> From: Erik Price [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 1:00 PM
> To: Tomcat Users List
> Subject: Re: Loading Singleton Classes
>
>
> If someone wanted to override the security of your class by subclassing
> your singleton (so the new subclass qualifies as being of your
> singleton's type) but with different, potentially malicious, logic inside.
>
> Probably not an issue if you are not exposing your code.
>
>
> Erik
>
>
>
> Felipe Schnack wrote:
> >   You could give me practical exemple of why I would do that?
> > On Thu, 2003-02-20 at 17:49, Mike Jackson wrote:
> >
> >>You could use final if you didn't want inherited versions to be
> able to have
> >>themselves be returned.
> >>
> >>--mikej
> >>-=-
> >>mike jackson
> >>[EMAIL PROTECTED]
> >>
> >>
> >>>-Original Message-
> >>>From: Felipe Schnack [mailto:[EMAIL PROTECTED]]
> >>>Sent: Thursday, February 20, 2003 12:44 PM
> >>>To: Tomcat Users List
> >>>Subject: Re: Loading Singleton Classes
> >>>
> >>>
> >>>  Or even
> >>>  public static final Singleton s = new Singleton();
> >>>  :-)
> >>>
> >>>On Thu, 2003-02-20 at 17:43, Tim Funk wrote:
> >>>
> >>>>Actually you'll want to make
> >>>>   public static Singleton s = new Singleton();
> >>>>be
> >>>>   private static Singleton s = new Singleton();
> >>>>
> >>>>So a wise guy doesn't do this:
> >>>>Singleton.s = null;
> >>>>
> >>>>-Tim
> >>>>
> >>>>Mike Jackson wrote:
> >>>>
> >>>>>To code it correctly follow the pattern.  :)
> >>>>>
> >>>>>
> >>>>>Should look something like this:
> >>>>>
> >>>>> class Singleton {
> >>>>> public static Singleton s = new Singleton();
> >>>>>
> >>>>> protected Singleton() {
> >>>>> super();
> >>>>> }
> >>>>> public static Singleton getHandle() {
> >>>>>     return s;
> >>>>> }
> >>>>> }
> >>>>>
> >>>>>--mikej
> >>>>>-=-
> >>>>>mike jackson
> >>>>>[EMAIL PROTECTED]
> >>>>>
> >>>>>
> >>>>>
> >>>>>>-Original Message-
> >>>>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>>>>>Sent: Thursday, February 20, 2003 11:35 AM
> >>>>>>To: Tomcat Users List
> >>>>>>Subject: RE: Loading Singleton Classes
> >>>>>>
> >>>>>>
> >>>>>>Ok. How do I code it incorrectly then? :)
> >>>>>>I want it to be unique to each session. Is there anyway I
> can do that?
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>-Original Message-
> >>>>>>>From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> >>>>>>>Sent: Thursday, February 20, 2003 2:31 PM
> >>>>>>>To: Tomcat Users List
> >>>>>>>Subject: RE: Loading Singleton Classes
> >>>>>>>
> >>>>>>>
> >>>>>>>Same, if you code it correctly.
> >>>>>>>
> >>>>>>>--mikej
> >>>>>>>-=-
> >>>>>>>mike jackson
> >>>>>>>[EMAIL PROTECTED]
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>-Original Message-
> >>>>>>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>>>>>>>Sent: Thursday, February 20, 2003 11:26 AM
> >>>>>>>>To: Tomcat Users List
> >>>>>>>>Subject: RE: Loading Singleton Classes
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>Hmmm
> >>>>>>>>
> >>>>&

Re: Loading Singleton Classes

2003-02-20 Thread Erik Price 
If someone wanted to override the security of your class by subclassing 
your singleton (so the new subclass qualifies as being of your 
singleton's type) but with different, potentially malicious, logic inside.

Probably not an issue if you are not exposing your code.


Erik



Felipe Schnack wrote:
  You could give me practical exemple of why I would do that?
On Thu, 2003-02-20 at 17:49, Mike Jackson wrote:


You could use final if you didn't want inherited versions to be able to have
themselves be returned.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]



-Original Message-
From: Felipe Schnack [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 12:44 PM
To: Tomcat Users List
Subject: Re: Loading Singleton Classes


 Or even
 public static final Singleton s = new Singleton();
 :-)

On Thu, 2003-02-20 at 17:43, Tim Funk wrote:


Actually you'll want to make
  public static Singleton s = new Singleton();
be
  private static Singleton s = new Singleton();

So a wise guy doesn't do this:
   Singleton.s = null;

-Tim

Mike Jackson wrote:


To code it correctly follow the pattern.  :)


Should look something like this:

	class Singleton {
		public static Singleton s = new Singleton();

		protected Singleton() {
			super();
		}
		public static Singleton getHandle() {
			return s;
		}
	}

--mikej
-=-
mike jackson
[EMAIL PROTECTED]




-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:35 AM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Ok. How do I code it incorrectly then? :)
I want it to be unique to each session. Is there anyway I can do that?




-Original Message-
From: Mike Jackson [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 2:31 PM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Same, if you code it correctly.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]




-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:26 AM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Hmmm

My jar is located in web-inf/lib

Perhaps I should rephrase that question.
When I load the singleton class, will it be the same singleton
called from all sessions or will it be unique to each session?




-Original Message-
From: Filip Hanik [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 2:15 PM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


it doesn't become a variable at all.

but to answer your question, if you load a singleton class it
all depends on where the class is in the classloader hierarchy.

if you put the class in a jar in common/lib, the singleton
will be for your entire tomcat server. if you put it in a jar
in web-inf/lib it becomes a singleton class for your webapp only.

Filip

-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:14 AM
To: Tomcat User List (E-mail)
Subject: Loading Singleton Classes



If I load a singleton class, does it become a session
variable or an application variable




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--

Felipe Schnack
Analista de Sistemas
[EMAIL PROTECTED]
Cel.: (51)91287530
Linux Counter #281893

Centro Universitário Ritter dos Reis
http://www.ritterdosreis.br
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F

RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
No, just saying that you might not want to limit yourself.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]

> -Original Message-
> From: Felipe Schnack [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 12:50 PM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
>
>
>   You could give me practical exemple of why I would do that?
> On Thu, 2003-02-20 at 17:49, Mike Jackson wrote:
> > You could use final if you didn't want inherited versions to be
> able to have
> > themselves be returned.
> >
> > --mikej
> > -=-
> > mike jackson
> > [EMAIL PROTECTED]
> >
> > > -Original Message-
> > > From: Felipe Schnack [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 12:44 PM
> > > To: Tomcat Users List
> > > Subject: Re: Loading Singleton Classes
> > >
> > >
> > >   Or even
> > >   public static final Singleton s = new Singleton();
> > >   :-)
> > >
> > > On Thu, 2003-02-20 at 17:43, Tim Funk wrote:
> > > > Actually you'll want to make
> > > >public static Singleton s = new Singleton();
> > > > be
> > > >private static Singleton s = new Singleton();
> > > >
> > > > So a wise guy doesn't do this:
> > > > Singleton.s = null;
> > > >
> > > > -Tim
> > > >
> > > > Mike Jackson wrote:
> > > > > To code it correctly follow the pattern.  :)
> > > > >
> > > > >
> > > > > Should look something like this:
> > > > >
> > > > >   class Singleton {
> > > > >   public static Singleton s = new Singleton();
> > > > >
> > > > >   protected Singleton() {
> > > > >   super();
> > > > >   }
> > > > >   public static Singleton getHandle() {
> > > > >   return s;
> > > > >   }
> > > > >   }
> > > > >
> > > > > --mikej
> > > > > -=-
> > > > > mike jackson
> > > > > [EMAIL PROTECTED]
> > > > >
> > > > >
> > > > >>-Original Message-
> > > > >>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > > >>Sent: Thursday, February 20, 2003 11:35 AM
> > > > >>To: Tomcat Users List
> > > > >>Subject: RE: Loading Singleton Classes
> > > > >>
> > > > >>
> > > > >>Ok. How do I code it incorrectly then? :)
> > > > >>I want it to be unique to each session. Is there anyway I
> can do that?
> > > > >>
> > > > >>
> > > > >>>-Original Message-
> > > > >>>From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> > > > >>>Sent: Thursday, February 20, 2003 2:31 PM
> > > > >>>To: Tomcat Users List
> > > > >>>Subject: RE: Loading Singleton Classes
> > > > >>>
> > > > >>>
> > > > >>>Same, if you code it correctly.
> > > > >>>
> > > > >>>--mikej
> > > > >>>-=-
> > > > >>>mike jackson
> > > > >>>[EMAIL PROTECTED]
> > > > >>>
> > > > >>>
> > > > >>>>-Original Message-
> > > > >>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > > >>>>Sent: Thursday, February 20, 2003 11:26 AM
> > > > >>>>To: Tomcat Users List
> > > > >>>>Subject: RE: Loading Singleton Classes
> > > > >>>>
> > > > >>>>
> > > > >>>>Hmmm
> > > > >>>>
> > > > >>>>My jar is located in web-inf/lib
> > > > >>>>
> > > > >>>>Perhaps I should rephrase that question.
> > > > >>>>When I load the singleton class, will it be the same singleton
> > > > >>>>called from all sessions or will it be unique to each session?
> > > > >>>>
> > > > >>>>
> > > > >>>>>-Original Message-
> > > > >>>>>From: Filip Hanik [mail

RE: Loading Singleton Classes

2003-02-20 Thread Felipe Schnack 
  You could give me practical exemple of why I would do that?
On Thu, 2003-02-20 at 17:49, Mike Jackson wrote:
> You could use final if you didn't want inherited versions to be able to have
> themselves be returned.
> 
> --mikej
> -=-
> mike jackson
> [EMAIL PROTECTED]
> 
> > -Original Message-
> > From: Felipe Schnack [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 12:44 PM
> > To: Tomcat Users List
> > Subject: Re: Loading Singleton Classes
> >
> >
> >   Or even
> >   public static final Singleton s = new Singleton();
> >   :-)
> >
> > On Thu, 2003-02-20 at 17:43, Tim Funk wrote:
> > > Actually you'll want to make
> > >public static Singleton s = new Singleton();
> > > be
> > >private static Singleton s = new Singleton();
> > >
> > > So a wise guy doesn't do this:
> > > Singleton.s = null;
> > >
> > > -Tim
> > >
> > > Mike Jackson wrote:
> > > > To code it correctly follow the pattern.  :)
> > > >
> > > >
> > > > Should look something like this:
> > > >
> > > > class Singleton {
> > > > public static Singleton s = new Singleton();
> > > >
> > > > protected Singleton() {
> > > > super();
> > > > }
> > > > public static Singleton getHandle() {
> > > >             return s;
> > > > }
> > > > }
> > > >
> > > > --mikej
> > > > -=-
> > > > mike jackson
> > > > [EMAIL PROTECTED]
> > > >
> > > >
> > > >>-Original Message-
> > > >>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > >>Sent: Thursday, February 20, 2003 11:35 AM
> > > >>To: Tomcat Users List
> > > >>Subject: RE: Loading Singleton Classes
> > > >>
> > > >>
> > > >>Ok. How do I code it incorrectly then? :)
> > > >>I want it to be unique to each session. Is there anyway I can do that?
> > > >>
> > > >>
> > > >>>-Original Message-
> > > >>>From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> > > >>>Sent: Thursday, February 20, 2003 2:31 PM
> > > >>>To: Tomcat Users List
> > > >>>Subject: RE: Loading Singleton Classes
> > > >>>
> > > >>>
> > > >>>Same, if you code it correctly.
> > > >>>
> > > >>>--mikej
> > > >>>-=-
> > > >>>mike jackson
> > > >>>[EMAIL PROTECTED]
> > > >>>
> > > >>>
> > > >>>>-Original Message-
> > > >>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > >>>>Sent: Thursday, February 20, 2003 11:26 AM
> > > >>>>To: Tomcat Users List
> > > >>>>Subject: RE: Loading Singleton Classes
> > > >>>>
> > > >>>>
> > > >>>>Hmmm
> > > >>>>
> > > >>>>My jar is located in web-inf/lib
> > > >>>>
> > > >>>>Perhaps I should rephrase that question.
> > > >>>>When I load the singleton class, will it be the same singleton
> > > >>>>called from all sessions or will it be unique to each session?
> > > >>>>
> > > >>>>
> > > >>>>>-Original Message-
> > > >>>>>From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > > >>>>>Sent: Thursday, February 20, 2003 2:15 PM
> > > >>>>>To: Tomcat Users List
> > > >>>>>Subject: RE: Loading Singleton Classes
> > > >>>>>
> > > >>>>>
> > > >>>>>it doesn't become a variable at all.
> > > >>>>>
> > > >>>>>but to answer your question, if you load a singleton class it
> > > >>>>>all depends on where the class is in the classloader hierarchy.
> > > >>>>>
> > > >>>>>if you put the class in a jar in common/l

RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
You could use final if you didn't want inherited versions to be able to have
themselves be returned.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]

> -Original Message-
> From: Felipe Schnack [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 12:44 PM
> To: Tomcat Users List
> Subject: Re: Loading Singleton Classes
>
>
>   Or even
>   public static final Singleton s = new Singleton();
>   :-)
>
> On Thu, 2003-02-20 at 17:43, Tim Funk wrote:
> > Actually you'll want to make
> >public static Singleton s = new Singleton();
> > be
> >private static Singleton s = new Singleton();
> >
> > So a wise guy doesn't do this:
> > Singleton.s = null;
> >
> > -Tim
> >
> > Mike Jackson wrote:
> > > To code it correctly follow the pattern.  :)
> > >
> > >
> > > Should look something like this:
> > >
> > >   class Singleton {
> > >   public static Singleton s = new Singleton();
> > >
> > >   protected Singleton() {
> > >   super();
> > >   }
> > >   public static Singleton getHandle() {
> > >   return s;
> > >   }
> > >   }
> > >
> > > --mikej
> > > -=-
> > > mike jackson
> > > [EMAIL PROTECTED]
> > >
> > >
> > >>-Original Message-
> > >>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > >>Sent: Thursday, February 20, 2003 11:35 AM
> > >>To: Tomcat Users List
> > >>Subject: RE: Loading Singleton Classes
> > >>
> > >>
> > >>Ok. How do I code it incorrectly then? :)
> > >>I want it to be unique to each session. Is there anyway I can do that?
> > >>
> > >>
> > >>>-Original Message-
> > >>>From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> > >>>Sent: Thursday, February 20, 2003 2:31 PM
> > >>>To: Tomcat Users List
> > >>>Subject: RE: Loading Singleton Classes
> > >>>
> > >>>
> > >>>Same, if you code it correctly.
> > >>>
> > >>>--mikej
> > >>>-=-
> > >>>mike jackson
> > >>>[EMAIL PROTECTED]
> > >>>
> > >>>
> > >>>>-Original Message-
> > >>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > >>>>Sent: Thursday, February 20, 2003 11:26 AM
> > >>>>To: Tomcat Users List
> > >>>>Subject: RE: Loading Singleton Classes
> > >>>>
> > >>>>
> > >>>>Hmmm
> > >>>>
> > >>>>My jar is located in web-inf/lib
> > >>>>
> > >>>>Perhaps I should rephrase that question.
> > >>>>When I load the singleton class, will it be the same singleton
> > >>>>called from all sessions or will it be unique to each session?
> > >>>>
> > >>>>
> > >>>>>-Original Message-
> > >>>>>From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > >>>>>Sent: Thursday, February 20, 2003 2:15 PM
> > >>>>>To: Tomcat Users List
> > >>>>>Subject: RE: Loading Singleton Classes
> > >>>>>
> > >>>>>
> > >>>>>it doesn't become a variable at all.
> > >>>>>
> > >>>>>but to answer your question, if you load a singleton class it
> > >>>>>all depends on where the class is in the classloader hierarchy.
> > >>>>>
> > >>>>>if you put the class in a jar in common/lib, the singleton
> > >>>>>will be for your entire tomcat server. if you put it in a jar
> > >>>>>in web-inf/lib it becomes a singleton class for your webapp only.
> > >>>>>
> > >>>>>Filip
> > >>>>>
> > >>>>>-Original Message-
> > >>>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > >>>>>Sent: Thursday, February 20, 2003 11:14 AM
> > >>>>>To: Tomcat User List (E-mail)
> > >>>>>Subject: Loading Singleton Classes
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>If I load a singleton class, does it become a s

RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
Oops.  Although I wouldn't implement it a private, I'd use protected, that
way a class that inherits can override the class returned.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]

> -Original Message-
> From: Tim Funk [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 12:43 PM
> To: Tomcat Users List
> Subject: Re: Loading Singleton Classes
>
>
> Actually you'll want to make
>public static Singleton s = new Singleton();
> be
>private static Singleton s = new Singleton();
>
> So a wise guy doesn't do this:
> Singleton.s = null;
>
> -Tim
>
> Mike Jackson wrote:
> > To code it correctly follow the pattern.  :)
> >
> >
> > Should look something like this:
> >
> > class Singleton {
> > public static Singleton s = new Singleton();
> >
> > protected Singleton() {
> > super();
> > }
> > public static Singleton getHandle() {
> > return s;
> > }
> > }
> >
> > --mikej
> > -=-
> > mike jackson
> > [EMAIL PROTECTED]
> >
> >
> >>-Original Message-
> >>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>Sent: Thursday, February 20, 2003 11:35 AM
> >>To: Tomcat Users List
> >>Subject: RE: Loading Singleton Classes
> >>
> >>
> >>Ok. How do I code it incorrectly then? :)
> >>I want it to be unique to each session. Is there anyway I can do that?
> >>
> >>
> >>>-Original Message-
> >>>From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> >>>Sent: Thursday, February 20, 2003 2:31 PM
> >>>To: Tomcat Users List
> >>>Subject: RE: Loading Singleton Classes
> >>>
> >>>
> >>>Same, if you code it correctly.
> >>>
> >>>--mikej
> >>>-=-
> >>>mike jackson
> >>>[EMAIL PROTECTED]
> >>>
> >>>
> >>>>-Original Message-
> >>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>>>Sent: Thursday, February 20, 2003 11:26 AM
> >>>>To: Tomcat Users List
> >>>>Subject: RE: Loading Singleton Classes
> >>>>
> >>>>
> >>>>Hmmm
> >>>>
> >>>>My jar is located in web-inf/lib
> >>>>
> >>>>Perhaps I should rephrase that question.
> >>>>When I load the singleton class, will it be the same singleton
> >>>>called from all sessions or will it be unique to each session?
> >>>>
> >>>>
> >>>>>-Original Message-
> >>>>>From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> >>>>>Sent: Thursday, February 20, 2003 2:15 PM
> >>>>>To: Tomcat Users List
> >>>>>Subject: RE: Loading Singleton Classes
> >>>>>
> >>>>>
> >>>>>it doesn't become a variable at all.
> >>>>>
> >>>>>but to answer your question, if you load a singleton class it
> >>>>>all depends on where the class is in the classloader hierarchy.
> >>>>>
> >>>>>if you put the class in a jar in common/lib, the singleton
> >>>>>will be for your entire tomcat server. if you put it in a jar
> >>>>>in web-inf/lib it becomes a singleton class for your webapp only.
> >>>>>
> >>>>>Filip
> >>>>>
> >>>>>-Original Message-
> >>>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>>>>Sent: Thursday, February 20, 2003 11:14 AM
> >>>>>To: Tomcat User List (E-mail)
> >>>>>Subject: Loading Singleton Classes
> >>>>>
> >>>>>
> >>>>>
> >>>>>If I load a singleton class, does it become a session
> >>>>>variable or an application variable
> >>>>>
> >>>>>
> >>>
> >>>-
> >>>
> >>>>>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>>>>For additional commands, e-mail:
> >>>
> >>>[EMAIL PROTECTED]
> >>>
> >>>>>
> >>>>>
> >>>-
> >>>
> >>>>>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>>>>For additional commands, e-mail:
> >>>
> >>>[EMAIL PROTECTED]
> >>>
> >>>>>
> >>>>
> >>>-
> >>>
> >>>>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>>>For additional commands, e-mail: [EMAIL PROTECTED]
> >>>>
> >>>
> >>>
> >>>-
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> >>>
> >>>
> >>
> >>-
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> >
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Re: Loading Singleton Classes

2003-02-20 Thread Felipe Schnack 
  Or even
  public static final Singleton s = new Singleton();
  :-)

On Thu, 2003-02-20 at 17:43, Tim Funk wrote:
> Actually you'll want to make
>public static Singleton s = new Singleton();
> be
>private static Singleton s = new Singleton();
> 
> So a wise guy doesn't do this:
> Singleton.s = null;
> 
> -Tim
> 
> Mike Jackson wrote:
> > To code it correctly follow the pattern.  :)
> > 
> > 
> > Should look something like this:
> > 
> > class Singleton {
> > public static Singleton s = new Singleton();
> > 
> > protected Singleton() {
> > super();
> > }
> > public static Singleton getHandle() { 
> > return s;
> > }
> > }
> > 
> > --mikej
> > -=-
> > mike jackson
> > [EMAIL PROTECTED] 
> > 
> > 
> >>-Original Message-
> >>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>Sent: Thursday, February 20, 2003 11:35 AM
> >>To: Tomcat Users List
> >>Subject: RE: Loading Singleton Classes
> >>
> >>
> >>Ok. How do I code it incorrectly then? :)
> >>I want it to be unique to each session. Is there anyway I can do that?
> >>
> >>
> >>>-Original Message-
> >>>From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> >>>Sent: Thursday, February 20, 2003 2:31 PM
> >>>To: Tomcat Users List
> >>>Subject: RE: Loading Singleton Classes
> >>>
> >>>
> >>>Same, if you code it correctly.
> >>>
> >>>--mikej
> >>>-=-
> >>>mike jackson
> >>>[EMAIL PROTECTED] 
> >>>
> >>>
> >>>>-Original Message-
> >>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>>>Sent: Thursday, February 20, 2003 11:26 AM
> >>>>To: Tomcat Users List
> >>>>Subject: RE: Loading Singleton Classes
> >>>>
> >>>>
> >>>>Hmmm
> >>>>
> >>>>My jar is located in web-inf/lib
> >>>>
> >>>>Perhaps I should rephrase that question.
> >>>>When I load the singleton class, will it be the same singleton 
> >>>>called from all sessions or will it be unique to each session?
> >>>>
> >>>>
> >>>>>-Original Message-
> >>>>>From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> >>>>>Sent: Thursday, February 20, 2003 2:15 PM
> >>>>>To: Tomcat Users List
> >>>>>Subject: RE: Loading Singleton Classes
> >>>>>
> >>>>>
> >>>>>it doesn't become a variable at all.
> >>>>>
> >>>>>but to answer your question, if you load a singleton class it 
> >>>>>all depends on where the class is in the classloader hierarchy.
> >>>>>
> >>>>>if you put the class in a jar in common/lib, the singleton 
> >>>>>will be for your entire tomcat server. if you put it in a jar 
> >>>>>in web-inf/lib it becomes a singleton class for your webapp only.
> >>>>>
> >>>>>Filip
> >>>>>
> >>>>>-Original Message-
> >>>>>From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> >>>>>Sent: Thursday, February 20, 2003 11:14 AM
> >>>>>To: Tomcat User List (E-mail)
> >>>>>Subject: Loading Singleton Classes
> >>>>>
> >>>>>
> >>>>>
> >>>>>If I load a singleton class, does it become a session 
> >>>>>variable or an application variable
> >>>>>
> >>>>>
> >>>
> >>>-
> >>>
> >>>>>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>>>>For additional commands, e-mail: 
> >>>
> >>>[EMAIL PROTECTED]
> >>>
> >>>>>
> >>>>>
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> >>>>>To unsubscribe, e-mail: [EMAIL PROTECTED]
> >>>>>For additional commands, e-mail: 
> >>>
> >>>[EMAIL PROTECTED]
> >>>
> >>>>>
> >>>>
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-- 

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Linux Counter #281893

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RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
Then again if it's a singleton there's no need to put a reference to it in
the session, that's just a needless use of memory.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]

> -Original Message-
> From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 12:41 PM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
>
>
> What if he actually needs a singleton?  That wouldn't help any.
>
> --mikej
> -=-
> mike jackson
> [EMAIL PROTECTED]
>
> > -Original Message-
> > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 11:37 AM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> >
> >
> > yes, don't make it a singleton :))
> >
> > just give each session an individual object instead of a
> singleton object.
> >
> > Filip
> >
> > -Original Message-
> > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 11:35 AM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> >
> >
> > Ok. How do I code it incorrectly then? :)
> > I want it to be unique to each session. Is there anyway I can do that?
> >
> > > -Original Message-
> > > From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 2:31 PM
> > > To: Tomcat Users List
> > > Subject: RE: Loading Singleton Classes
> > >
> > >
> > > Same, if you code it correctly.
> > >
> > > --mikej
> > > -=-
> > > mike jackson
> > > [EMAIL PROTECTED]
> > >
> > > > -Original Message-
> > > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > > Sent: Thursday, February 20, 2003 11:26 AM
> > > > To: Tomcat Users List
> > > > Subject: RE: Loading Singleton Classes
> > > >
> > > >
> > > > Hmmm
> > > >
> > > > My jar is located in web-inf/lib
> > > >
> > > > Perhaps I should rephrase that question.
> > > > When I load the singleton class, will it be the same singleton
> > > > called from all sessions or will it be unique to each session?
> > > >
> > > > > -Original Message-
> > > > > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > > > > Sent: Thursday, February 20, 2003 2:15 PM
> > > > > To: Tomcat Users List
> > > > > Subject: RE: Loading Singleton Classes
> > > > >
> > > > >
> > > > > it doesn't become a variable at all.
> > > > >
> > > > > but to answer your question, if you load a singleton class it
> > > > > all depends on where the class is in the classloader hierarchy.
> > > > >
> > > > > if you put the class in a jar in common/lib, the singleton
> > > > > will be for your entire tomcat server. if you put it in a jar
> > > > > in web-inf/lib it becomes a singleton class for your webapp only.
> > > > >
> > > > > Filip
> > > > >
> > > > > -Original Message-
> > > > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > > > Sent: Thursday, February 20, 2003 11:14 AM
> > > > > To: Tomcat User List (E-mail)
> > > > > Subject: Loading Singleton Classes
> > > > >
> > > > >
> > > > >
> > > > > If I load a singleton class, does it become a session
> > > > > variable or an application variable
> > > > >
> > > > >
> > > -
> > > > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > > For additional commands, e-mail:
> > > [EMAIL PROTECTED]
> > > > >
> > > > >
> > > > >
> > > -
> > > > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > > For additional commands, e-mail:
> > > [EMAIL PROTECTED]
> > > > >
> > > > >
> > > >
> > > >
> > > -
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> > > >
> > >
> > >
> > > -
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> > >
> >
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Re: Loading Singleton Classes

2003-02-20 Thread Tim Funk 
Actually you'll want to make
  public static Singleton s = new Singleton();
be
  private static Singleton s = new Singleton();

So a wise guy doesn't do this:
   Singleton.s = null;

-Tim

Mike Jackson wrote:

To code it correctly follow the pattern.  :)


Should look something like this:

	class Singleton {
		public static Singleton s = new Singleton();

		protected Singleton() {
			super();
		}
		public static Singleton getHandle() { 
			return s;
		}
	}

--mikej
-=-
mike jackson
[EMAIL PROTECTED] 


-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:35 AM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Ok. How do I code it incorrectly then? :)
I want it to be unique to each session. Is there anyway I can do that?



-Original Message-
From: Mike Jackson [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 2:31 PM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Same, if you code it correctly.

--mikej
-=-
mike jackson
[EMAIL PROTECTED] 


-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:26 AM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Hmmm

My jar is located in web-inf/lib

Perhaps I should rephrase that question.
When I load the singleton class, will it be the same singleton 
called from all sessions or will it be unique to each session?


-Original Message-
From: Filip Hanik [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 2:15 PM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


it doesn't become a variable at all.

but to answer your question, if you load a singleton class it 
all depends on where the class is in the classloader hierarchy.

if you put the class in a jar in common/lib, the singleton 
will be for your entire tomcat server. if you put it in a jar 
in web-inf/lib it becomes a singleton class for your webapp only.

Filip

-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:14 AM
To: Tomcat User List (E-mail)
Subject: Loading Singleton Classes



If I load a singleton class, does it become a session 
variable or an application variable



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RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
What if he actually needs a singleton?  That wouldn't help any.

--mikej
-=-
mike jackson
[EMAIL PROTECTED]

> -Original Message-
> From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 11:37 AM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
>
>
> yes, don't make it a singleton :))
>
> just give each session an individual object instead of a singleton object.
>
> Filip
>
> -Original Message-
> From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 11:35 AM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
>
>
> Ok. How do I code it incorrectly then? :)
> I want it to be unique to each session. Is there anyway I can do that?
>
> > -Original Message-
> > From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 2:31 PM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> >
> >
> > Same, if you code it correctly.
> >
> > --mikej
> > -=-
> > mike jackson
> > [EMAIL PROTECTED]
> >
> > > -Original Message-
> > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 11:26 AM
> > > To: Tomcat Users List
> > > Subject: RE: Loading Singleton Classes
> > >
> > >
> > > Hmmm
> > >
> > > My jar is located in web-inf/lib
> > >
> > > Perhaps I should rephrase that question.
> > > When I load the singleton class, will it be the same singleton
> > > called from all sessions or will it be unique to each session?
> > >
> > > > -Original Message-
> > > > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > > > Sent: Thursday, February 20, 2003 2:15 PM
> > > > To: Tomcat Users List
> > > > Subject: RE: Loading Singleton Classes
> > > >
> > > >
> > > > it doesn't become a variable at all.
> > > >
> > > > but to answer your question, if you load a singleton class it
> > > > all depends on where the class is in the classloader hierarchy.
> > > >
> > > > if you put the class in a jar in common/lib, the singleton
> > > > will be for your entire tomcat server. if you put it in a jar
> > > > in web-inf/lib it becomes a singleton class for your webapp only.
> > > >
> > > > Filip
> > > >
> > > > -Original Message-
> > > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > > Sent: Thursday, February 20, 2003 11:14 AM
> > > > To: Tomcat User List (E-mail)
> > > > Subject: Loading Singleton Classes
> > > >
> > > >
> > > >
> > > > If I load a singleton class, does it become a session
> > > > variable or an application variable
> > > >
> > > >
> > -
> > > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > For additional commands, e-mail:
> > [EMAIL PROTECTED]
> > > >
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> > > >
> > -
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RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
To code it correctly follow the pattern.  :)


Should look something like this:

class Singleton {
public static Singleton s = new Singleton();

protected Singleton() {
super();
}
public static Singleton getHandle() { 
return s;
}
}

--mikej
-=-
mike jackson
[EMAIL PROTECTED] 

> -Original Message-
> From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 11:35 AM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
> 
> 
> Ok. How do I code it incorrectly then? :)
> I want it to be unique to each session. Is there anyway I can do that?
> 
> > -Original Message-
> > From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 2:31 PM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> > 
> > 
> > Same, if you code it correctly.
> > 
> > --mikej
> > -=-
> > mike jackson
> > [EMAIL PROTECTED] 
> > 
> > > -Original Message-
> > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 11:26 AM
> > > To: Tomcat Users List
> > > Subject: RE: Loading Singleton Classes
> > > 
> > > 
> > > Hmmm
> > > 
> > > My jar is located in web-inf/lib
> > > 
> > > Perhaps I should rephrase that question.
> > > When I load the singleton class, will it be the same singleton 
> > > called from all sessions or will it be unique to each session?
> > > 
> > > > -Original Message-
> > > > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > > > Sent: Thursday, February 20, 2003 2:15 PM
> > > > To: Tomcat Users List
> > > > Subject: RE: Loading Singleton Classes
> > > > 
> > > > 
> > > > it doesn't become a variable at all.
> > > > 
> > > > but to answer your question, if you load a singleton class it 
> > > > all depends on where the class is in the classloader hierarchy.
> > > > 
> > > > if you put the class in a jar in common/lib, the singleton 
> > > > will be for your entire tomcat server. if you put it in a jar 
> > > > in web-inf/lib it becomes a singleton class for your webapp only.
> > > > 
> > > > Filip
> > > > 
> > > > -Original Message-
> > > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > > Sent: Thursday, February 20, 2003 11:14 AM
> > > > To: Tomcat User List (E-mail)
> > > > Subject: Loading Singleton Classes
> > > > 
> > > > 
> > > > 
> > > > If I load a singleton class, does it become a session 
> > > > variable or an application variable
> > > > 
> > > > 
> > -
> > > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > For additional commands, e-mail: 
> > [EMAIL PROTECTED]
> > > > 
> > > > 
> > > > 
> > -
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RE: Loading Singleton Classes

2003-02-20 Thread Filip Hanik 
yes, don't make it a singleton :))

just give each session an individual object instead of a singleton object.

Filip

-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:35 AM
To: Tomcat Users List
Subject: RE: Loading Singleton Classes


Ok. How do I code it incorrectly then? :)
I want it to be unique to each session. Is there anyway I can do that?

> -Original Message-
> From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 2:31 PM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
> 
> 
> Same, if you code it correctly.
> 
> --mikej
> -=-
> mike jackson
> [EMAIL PROTECTED] 
> 
> > -Original Message-
> > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 11:26 AM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> > 
> > 
> > Hmmm
> > 
> > My jar is located in web-inf/lib
> > 
> > Perhaps I should rephrase that question.
> > When I load the singleton class, will it be the same singleton 
> > called from all sessions or will it be unique to each session?
> > 
> > > -Original Message-----
> > > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 2:15 PM
> > > To: Tomcat Users List
> > > Subject: RE: Loading Singleton Classes
> > > 
> > > 
> > > it doesn't become a variable at all.
> > > 
> > > but to answer your question, if you load a singleton class it 
> > > all depends on where the class is in the classloader hierarchy.
> > > 
> > > if you put the class in a jar in common/lib, the singleton 
> > > will be for your entire tomcat server. if you put it in a jar 
> > > in web-inf/lib it becomes a singleton class for your webapp only.
> > > 
> > > Filip
> > > 
> > > -Original Message-
> > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 11:14 AM
> > > To: Tomcat User List (E-mail)
> > > Subject: Loading Singleton Classes
> > > 
> > > 
> > > 
> > > If I load a singleton class, does it become a session 
> > > variable or an application variable
> > > 
> > > 
> -
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RE: Loading Singleton Classes

2003-02-20 Thread Luc Foisy 
Ok. How do I code it incorrectly then? :)
I want it to be unique to each session. Is there anyway I can do that?

> -Original Message-
> From: Mike Jackson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 2:31 PM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
> 
> 
> Same, if you code it correctly.
> 
> --mikej
> -=-
> mike jackson
> [EMAIL PROTECTED] 
> 
> > -Original Message-
> > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 11:26 AM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> > 
> > 
> > Hmmm
> > 
> > My jar is located in web-inf/lib
> > 
> > Perhaps I should rephrase that question.
> > When I load the singleton class, will it be the same singleton 
> > called from all sessions or will it be unique to each session?
> > 
> > > -Original Message-
> > > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 2:15 PM
> > > To: Tomcat Users List
> > > Subject: RE: Loading Singleton Classes
> > > 
> > > 
> > > it doesn't become a variable at all.
> > > 
> > > but to answer your question, if you load a singleton class it 
> > > all depends on where the class is in the classloader hierarchy.
> > > 
> > > if you put the class in a jar in common/lib, the singleton 
> > > will be for your entire tomcat server. if you put it in a jar 
> > > in web-inf/lib it becomes a singleton class for your webapp only.
> > > 
> > > Filip
> > > 
> > > -Original Message-
> > > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > > Sent: Thursday, February 20, 2003 11:14 AM
> > > To: Tomcat User List (E-mail)
> > > Subject: Loading Singleton Classes
> > > 
> > > 
> > > 
> > > If I load a singleton class, does it become a session 
> > > variable or an application variable
> > > 
> > > 
> -
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> > > 
> > > 
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> > > 
> > 
> > 
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RE: Loading Singleton Classes

2003-02-20 Thread Mike Jackson 
Same, if you code it correctly.

--mikej
-=-
mike jackson
[EMAIL PROTECTED] 

> -Original Message-
> From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 11:26 AM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
> 
> 
> Hmmm
> 
> My jar is located in web-inf/lib
> 
> Perhaps I should rephrase that question.
> When I load the singleton class, will it be the same singleton 
> called from all sessions or will it be unique to each session?
> 
> > -Original Message-
> > From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 2:15 PM
> > To: Tomcat Users List
> > Subject: RE: Loading Singleton Classes
> > 
> > 
> > it doesn't become a variable at all.
> > 
> > but to answer your question, if you load a singleton class it 
> > all depends on where the class is in the classloader hierarchy.
> > 
> > if you put the class in a jar in common/lib, the singleton 
> > will be for your entire tomcat server. if you put it in a jar 
> > in web-inf/lib it becomes a singleton class for your webapp only.
> > 
> > Filip
> > 
> > -Original Message-
> > From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, February 20, 2003 11:14 AM
> > To: Tomcat User List (E-mail)
> > Subject: Loading Singleton Classes
> > 
> > 
> > 
> > If I load a singleton class, does it become a session 
> > variable or an application variable
> > 
> > -
> > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > For additional commands, e-mail: [EMAIL PROTECTED]
> > 
> > 
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> 
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RE: Loading Singleton Classes

2003-02-20 Thread Luc Foisy 
Hmmm

My jar is located in web-inf/lib

Perhaps I should rephrase that question.
When I load the singleton class, will it be the same singleton called from all 
sessions or will it be unique to each session?

> -Original Message-
> From: Filip Hanik [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 2:15 PM
> To: Tomcat Users List
> Subject: RE: Loading Singleton Classes
> 
> 
> it doesn't become a variable at all.
> 
> but to answer your question, if you load a singleton class it 
> all depends on where the class is in the classloader hierarchy.
> 
> if you put the class in a jar in common/lib, the singleton 
> will be for your entire tomcat server. if you put it in a jar 
> in web-inf/lib it becomes a singleton class for your webapp only.
> 
> Filip
> 
> -Original Message-
> From: Luc Foisy [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 20, 2003 11:14 AM
> To: Tomcat User List (E-mail)
> Subject: Loading Singleton Classes
> 
> 
> 
> If I load a singleton class, does it become a session 
> variable or an application variable
> 
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
> 
> 
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RE: Loading Singleton Classes

2003-02-20 Thread Filip Hanik 
it doesn't become a variable at all.

but to answer your question, if you load a singleton class it all depends on where the 
class is in the classloader hierarchy.

if you put the class in a jar in common/lib, the singleton will be for your entire 
tomcat server. if you put it in a jar in web-inf/lib it becomes a singleton class for 
your webapp only.

Filip

-Original Message-
From: Luc Foisy [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 20, 2003 11:14 AM
To: Tomcat User List (E-mail)
Subject: Loading Singleton Classes



If I load a singleton class, does it become a session variable or an application 
variable

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