| SessionSingletonBase encapsulated [message #40393] |
Tue, 24 July 2007 09:24  |
Eclipse User |
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Originally posted by: pfischer06.fast-mail.org
Hello,
I try to use rap and rcp parallel created from the same ui-code. With
factory-interfaces this works until now. But I want to have an
ApplicationContext as singleton. On rap-side I have to use the abstract
SessionSingletonBase. But this can not be encapsulated to an interface
so I dont know how to have the same static getInstance() acces to a
singleton object on rap and rcp.
Has anyone solved this problem?
Thanks and regards,
Peter
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| Re: SessionSingletonBase encapsulated [message #40547 is a reply to message #40393] |
Tue, 24 July 2007 15:51  |
| Eclipse User |
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Originally posted by: fappel.innoopract.com
Hi,
just a sketch how it could be done, don't say that thats the one-and-only
way...
The Idea is not to use a classical Singleton approach with only one class. I
combine it with a kind of factory that is used in the singleton to get the
singleton implementation of choice. To do this I use to Interfaces:
public interface IMySingleton {
}
public interface IMySingletonFactory {
IMySingleton getInstance();
}
One for the actual singleton type and one for the factory that creates the
instance. The singleton class itself has the expected getInstance() plus a
register method with which the appropriate factory could be registered. This
must be done before the first call to getInstance() of course:
public class MySingleton implements IMySingleton {
private static IMySingletonFactory factory;
public static void register( final IMySingletonFactory factory ) {
MySingleton.factory = factory;
}
public static IMySingleton getInstance() {
return factory.getInstance();
}
}
At last you need the implementations. This can be done somehow like the
following. As there is not much to do for the factory one can also combine
the implementation of the factory and the interface type in one class as
shown with the 'real singleton':
class MySessionSingletonFactoryImpl implements IMySingletonFactory{
public IMySingleton getInstance() {
return MySessionSingletonImpl.getInstance();
}
}
class MySessionSingletonImpl
extends SessionSingletonBase
implements IMySingleton
{
public static IMySingleton getInstance() {
return ( IMySingleton )getInstance( MySessionSingletonImpl.class );
}
}
class MyRealSingleton
implements IMySingleton, IMySingletonFactory
{
public IMySingleton getInstance() {
[...]
}
Hope that helps!
Ciao
Frank
"Peter Fischer" <pfischer06@fast-mail.org> schrieb im Newsbeitrag
news:f84gfj$85o$1@build.eclipse.org...
> Hello,
>
> I try to use rap and rcp parallel created from the same ui-code. With
> factory-interfaces this works until now. But I want to have an
> ApplicationContext as singleton. On rap-side I have to use the abstract
> SessionSingletonBase. But this can not be encapsulated to an interface so
> I dont know how to have the same static getInstance() acces to a singleton
> object on rap and rcp.
>
> Has anyone solved this problem?
>
> Thanks and regards,
> Peter
|
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| Re: SessionSingletonBase encapsulated [message #40578 is a reply to message #40547] |
Wed, 25 July 2007 09:39 |
| Eclipse User |
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Originally posted by: pfischer06.fast-mail.org
Hello Frank,
Frank Appel wrote:
> [a good example]
Thank you very much for your example. It's working fine and I learned
much. :)
The MySingleton class has to implement the needed interface-methods. But
I let them throw an Exception to be sure not to use the MySingleton class.
regards,
Peter
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| Re: SessionSingletonBase encapsulated [message #107034 is a reply to message #40547] |
Tue, 30 September 2008 10:59 |
 rollo
Messages: 117
Registered: July 2009 |
Senior Member |
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Hi Frank,
how can i you your example for this class?
public abstract class MyComposite extends Composite{
protected MyComposite(Composite parent, int style) {
super(parent, style);
createLayout();
init();
}
protected abstract void createLayout();
protected abstract void init();
}
I don't get it on my own! Please help me.
Roland
Frank Appel schrieb:
> Hi,
>
> just a sketch how it could be done, don't say that thats the one-and-only
> way...
>
> The Idea is not to use a classical Singleton approach with only one class. I
> combine it with a kind of factory that is used in the singleton to get the
> singleton implementation of choice. To do this I use to Interfaces:
>
> public interface IMySingleton {
>
> }
>
> public interface IMySingletonFactory {
> IMySingleton getInstance();
> }
>
> One for the actual singleton type and one for the factory that creates the
> instance. The singleton class itself has the expected getInstance() plus a
> register method with which the appropriate factory could be registered. This
> must be done before the first call to getInstance() of course:
>
> public class MySingleton implements IMySingleton {
>
>
> private static IMySingletonFactory factory;
>
> public static void register( final IMySingletonFactory factory ) {
> MySingleton.factory = factory;
> }
>
> public static IMySingleton getInstance() {
> return factory.getInstance();
> }
> }
>
> At last you need the implementations. This can be done somehow like the
> following. As there is not much to do for the factory one can also combine
> the implementation of the factory and the interface type in one class as
> shown with the 'real singleton':
>
> class MySessionSingletonFactoryImpl implements IMySingletonFactory{
>
> public IMySingleton getInstance() {
> return MySessionSingletonImpl.getInstance();
> }
>
> }
> class MySessionSingletonImpl
> extends SessionSingletonBase
> implements IMySingleton
> {
> public static IMySingleton getInstance() {
> return ( IMySingleton )getInstance( MySessionSingletonImpl.class );
> }
> }
>
> class MyRealSingleton
> implements IMySingleton, IMySingletonFactory
> {
> public IMySingleton getInstance() {
> [...]
> }
>
> Hope that helps!
>
> Ciao
> Frank
>
>
> "Peter Fischer" <pfischer06@fast-mail.org> schrieb im Newsbeitrag
> news:f84gfj$85o$1@build.eclipse.org...
>> Hello,
>>
>> I try to use rap and rcp parallel created from the same ui-code. With
>> factory-interfaces this works until now. But I want to have an
>> ApplicationContext as singleton. On rap-side I have to use the abstract
>> SessionSingletonBase. But this can not be encapsulated to an interface so
>> I dont know how to have the same static getInstance() acces to a singleton
>> object on rap and rcp.
>>
>> Has anyone solved this problem?
>>
>> Thanks and regards,
>> Peter
>
>
> Hi,
>
> just a sketch how it could be done, don't say that thats the one-and-only
> way...
>
> The Idea is not to use a classical Singleton approach with only one class. I
> combine it with a kind of factory that is used in the singleton to get the
> singleton implementation of choice. To do this I use to Interfaces:
>
> public interface IMySingleton {
>
> }
>
> public interface IMySingletonFactory {
> IMySingleton getInstance();
> }
>
> One for the actual singleton type and one for the factory that creates the
> instance. The singleton class itself has the expected getInstance() plus a
> register method with which the appropriate factory could be registered. This
> must be done before the first call to getInstance() of course:
>
> public class MySingleton implements IMySingleton {
>
>
> private static IMySingletonFactory factory;
>
> public static void register( final IMySingletonFactory factory ) {
> MySingleton.factory = factory;
> }
>
> public static IMySingleton getInstance() {
> return factory.getInstance();
> }
> }
>
> At last you need the implementations. This can be done somehow like the
> following. As there is not much to do for the factory one can also combine
> the implementation of the factory and the interface type in one class as
> shown with the 'real singleton':
>
> class MySessionSingletonFactoryImpl implements IMySingletonFactory{
>
> public IMySingleton getInstance() {
> return MySessionSingletonImpl.getInstance();
> }
>
> }
> class MySessionSingletonImpl
> extends SessionSingletonBase
> implements IMySingleton
> {
> public static IMySingleton getInstance() {
> return ( IMySingleton )getInstance( MySessionSingletonImpl.class );
> }
> }
>
> class MyRealSingleton
> implements IMySingleton, IMySingletonFactory
> {
> public IMySingleton getInstance() {
> [...]
> }
>
> Hope that helps!
>
> Ciao
> Frank
>
>
> "Peter Fischer" <pfischer06@fast-mail.org> schrieb im Newsbeitrag
> news:f84gfj$85o$1@build.eclipse.org...
>> Hello,
>>
>> I try to use rap and rcp parallel created from the same ui-code. With
>> factory-interfaces this works until now. But I want to have an
>> ApplicationContext as singleton. On rap-side I have to use the abstract
>> SessionSingletonBase. But this can not be encapsulated to an interface so
>> I dont know how to have the same static getInstance() acces to a singleton
>> object on rap and rcp.
>>
>> Has anyone solved this problem?
>>
>> Thanks and regards,
>> Peter
>
>
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| Re: SessionSingletonBase encapsulated [message #107054 is a reply to message #107034] |
Tue, 30 September 2008 12:17 |
| Eclipse User |
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|
|
Originally posted by: benjamin.wolff.web.de
hi,
the question is, why do you want a composite to be a session-singleton? RAP
handles the session related stuff when using GUI stuff.
do you maybe just want to encapsulate session unique data/handlers/etc.?!
greets
-ben
Roland Siebert schrieb:
> Hi Frank,
>
> how can i you your example for this class?
>
> public abstract class MyComposite extends Composite{
>
> protected MyComposite(Composite parent, int style) {
> super(parent, style);
> createLayout();
> init();
> }
>
> protected abstract void createLayout();
>
> protected abstract void init();
> }
>
> I don't get it on my own! Please help me.
>
> Roland
>
> Frank Appel schrieb:
>> Hi,
>>
>> just a sketch how it could be done, don't say that thats the
>> one-and-only way...
>>
>> The Idea is not to use a classical Singleton approach with only one
>> class. I combine it with a kind of factory that is used in the
>> singleton to get the singleton implementation of choice. To do this I
>> use to Interfaces:
>>
>> public interface IMySingleton {
>>
>> }
>>
>> public interface IMySingletonFactory {
>> IMySingleton getInstance();
>> }
>>
>> One for the actual singleton type and one for the factory that creates
>> the instance. The singleton class itself has the expected
>> getInstance() plus a register method with which the appropriate
>> factory could be registered. This must be done before the first call
>> to getInstance() of course:
>>
>> public class MySingleton implements IMySingleton {
>>
>>
>> private static IMySingletonFactory factory;
>>
>> public static void register( final IMySingletonFactory factory ) {
>> MySingleton.factory = factory;
>> }
>>
>> public static IMySingleton getInstance() {
>> return factory.getInstance();
>> }
>> }
>>
>> At last you need the implementations. This can be done somehow like
>> the following. As there is not much to do for the factory one can also
>> combine the implementation of the factory and the interface type in
>> one class as shown with the 'real singleton':
>>
>> class MySessionSingletonFactoryImpl implements IMySingletonFactory{
>>
>> public IMySingleton getInstance() {
>> return MySessionSingletonImpl.getInstance();
>> }
>>
>> }
>> class MySessionSingletonImpl
>> extends SessionSingletonBase
>> implements IMySingleton
>> {
>> public static IMySingleton getInstance() {
>> return ( IMySingleton )getInstance( MySessionSingletonImpl.class );
>> }
>> }
>>
>> class MyRealSingleton
>> implements IMySingleton, IMySingletonFactory
>> {
>> public IMySingleton getInstance() {
>> [...]
>> }
>>
>> Hope that helps!
>>
>> Ciao
>> Frank
>>
>>
>> "Peter Fischer" <pfischer06@fast-mail.org> schrieb im Newsbeitrag
>> news:f84gfj$85o$1@build.eclipse.org...
>>> Hello,
>>>
>>> I try to use rap and rcp parallel created from the same ui-code. With
>>> factory-interfaces this works until now. But I want to have an
>>> ApplicationContext as singleton. On rap-side I have to use the
>>> abstract SessionSingletonBase. But this can not be encapsulated to an
>>> interface so I dont know how to have the same static getInstance()
>>> acces to a singleton object on rap and rcp.
>>>
>>> Has anyone solved this problem?
>>>
>>> Thanks and regards,
>>> Peter
>>
>>
>
>> Hi,
>>
>> just a sketch how it could be done, don't say that thats the
>> one-and-only way...
>>
>> The Idea is not to use a classical Singleton approach with only one
>> class. I combine it with a kind of factory that is used in the
>> singleton to get the singleton implementation of choice. To do this I
>> use to Interfaces:
>>
>> public interface IMySingleton {
>>
>> }
>>
>> public interface IMySingletonFactory {
>> IMySingleton getInstance();
>> }
>>
>> One for the actual singleton type and one for the factory that creates
>> the instance. The singleton class itself has the expected
>> getInstance() plus a register method with which the appropriate
>> factory could be registered. This must be done before the first call
>> to getInstance() of course:
>>
>> public class MySingleton implements IMySingleton {
>>
>>
>> private static IMySingletonFactory factory;
>>
>> public static void register( final IMySingletonFactory factory ) {
>> MySingleton.factory = factory;
>> }
>>
>> public static IMySingleton getInstance() {
>> return factory.getInstance();
>> }
>> }
>>
>> At last you need the implementations. This can be done somehow like
>> the following. As there is not much to do for the factory one can also
>> combine the implementation of the factory and the interface type in
>> one class as shown with the 'real singleton':
>>
>> class MySessionSingletonFactoryImpl implements IMySingletonFactory{
>>
>> public IMySingleton getInstance() {
>> return MySessionSingletonImpl.getInstance();
>> }
>>
>> }
>> class MySessionSingletonImpl
>> extends SessionSingletonBase
>> implements IMySingleton
>> {
>> public static IMySingleton getInstance() {
>> return ( IMySingleton )getInstance( MySessionSingletonImpl.class );
>> }
>> }
>>
>> class MyRealSingleton
>> implements IMySingleton, IMySingletonFactory
>> {
>> public IMySingleton getInstance() {
>> [...]
>> }
>>
>> Hope that helps!
>>
>> Ciao
>> Frank
>>
>>
>> "Peter Fischer" <pfischer06@fast-mail.org> schrieb im Newsbeitrag
>> news:f84gfj$85o$1@build.eclipse.org...
>>> Hello,
>>>
>>> I try to use rap and rcp parallel created from the same ui-code. With
>>> factory-interfaces this works until now. But I want to have an
>>> ApplicationContext as singleton. On rap-side I have to use the
>>> abstract SessionSingletonBase. But this can not be encapsulated to an
>>> interface so I dont know how to have the same static getInstance()
>>> acces to a singleton object on rap and rcp.
>>>
>>> Has anyone solved this problem?
>>>
>>> Thanks and regards,
>>> Peter
>>
>>
|
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| Re: SessionSingletonBase encapsulated [message #107165 is a reply to message #107122] |
Tue, 30 September 2008 14:16 |
| Eclipse User |
|
|
|
Originally posted by: benjamin.wolff.web.de
on the first view it seems that you want to work with a static registry object,
but static in this context means the same object for every session, as we already
concluded. so either you remove the static attributes from the register class and
work with local objects or you:
- remove everything static from the register class
- extend the register class from SessionSingletonBase and implement the methods
- replace Register.blabla() calls with Register.getInstance().blabla() calls
Thus you'll only work with one object throughout the session, as if you would use
one static object in a single-user application.
The documentation of SessionSingletonBase should give you some hints.
greets
-ben
Roland Siebert schrieb:
> Hi,
>
> I don't know how I explain what I want, cause my english is not so good.
>
> I have put an exapmle project in the attachment, that shows what I want.
> Hope this will help.
>
> Roland
>
> Ben W. schrieb:
>> hi,
>>
>> the question is, why do you want a composite to be a
>> session-singleton? RAP handles the session related stuff when using
>> GUI stuff.
>>
>> do you maybe just want to encapsulate session unique data/handlers/etc.?!
>>
>> greets
>> -ben
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