Eclipse Community Forums: Eclipse 4 » At what Point to insert a singleton class into the model?

Help

Home

Home » Eclipse Projects » Eclipse 4 » At what Point to insert a singleton class into the model?

Show: Today's Messages :: Show Polls :: Message Navigator

At what Point to insert a singleton class into the model? [message #987874]

Wed, 28 November 2012 13:25

Alex Kipling

Messages: 260
Registered: July 2012

Senior Member

I have a Singleton class, which should do some work, every time when a new Object is inserted into the Context.

If it would be in the model - I could do something like that inside the Singleton:


@Inject
onChange(MyClass monitor){
 //do the work here
}

What would be the best way to attach the Singleton to model, in order to monitor MyClass changes inside the context?

Report message to a moderator

Re: At what Point to insert a singleton class into the model? [message #987877 is a reply to message #987874]

Wed, 28 November 2012 13:34

Christoph Keimel

Messages: 482
Registered: December 2010
Location: Germany

Senior Member

Ideas that come to mind:
1) Add it to the Model as an AddOn
2) Create and add the instance to the application context manualy on @PostContextCreate in your life cycle handler.

You should probably use @Optional too, since there will probably not be a MyClass in the context on creation of your singleton.

Report message to a moderator

Re: At what Point to insert a singleton class into the model? [message #987878 is a reply to message #987874]

Wed, 28 November 2012 13:37

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

As far as I have understood, I would suggest to create your Singleton not as a Singleton, but as a POJO. Then annotate your class with @Creatable and @Singleton, and let the container do the "magic".

If you need to create your Singleton yourself with some initialization parameters or whatever, I guess a lifecycle hook method annotated with @PostContextCreate would be the best place to add it to the context.

Report message to a moderator

Re: At what Point to insert a singleton class into the model? [message #987883 is a reply to message #987878]

Wed, 28 November 2012 14:12

Alex Kipling

Messages: 260
Registered: July 2012

Senior Member

Thnx Dirk, Christoph!
The @Creatable approach is what i need.

An other way could be using context.runAndTrack(new RunAndTrack()) to track object changes in context.

Report message to a moderator

Previous Topic:	How to create a handler by id?
Next Topic:	XWT ValidationRule question

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Wed Apr 24 23:41:52 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter