RE: [Springframework-developer] SpringMVC BeanFactory/Component Scopes

[bing r. <br...@bn...>]

Hi, 

This may  not be what you want, but I have been fascinated  by the
jsf-spring project (http://jsf-spring.sourceforge.net)  and one of the nice
features it provides is to allow me to place Spring beans in the web scopes
I like. Of course if you hate jsf....


Bing



-----Original Message-----
From: spr...@li...
[mailto:spr...@li...] On Behalf Of
Brian McCallister
Sent: Tuesday, September 21, 2004 3:01 AM
To: spr...@li...
Subject: [Springframework-developer] SpringMVC BeanFactory/Component Scopes

I may be wrong in thinking that this doesn't exist in Spring, if I am,
please tell me! I cannot find anything though.

In the SpringMVC configurator I would like to have scope BeanFactory
instances. One, as currently, in the application scope, one in the session,
and one in the request. Each factory would have the higher scope as its
parent.

The primary reason for this is that I would like to have strongly typed
session scoped components.

public class ThrowAwayFooController
{
	private BarComponent bar;

	public void setBarComponent(BarComponent bar) { this.bar = bar; }

	public void doStuff() {
		bar.setSomeSessionData("wombats!");
	}
}

would sit in the request scope factory as a singleton, the BarComponent
(following)

public class BarComponent
{
	private String animalType;

	public void setBarComponent(BarComponent bar) { this.bar = bar; }

	public void setSomeSessionData(final String animalsType) {
		this.animalType = animalType;
	}
	
	public String getAnimalType() { return animalType; } }

would be in the session scope factory.

Later throwaway controllers could also be dependent on BarComponent and
receive the same one.

This provides a much cleaner way of handling session state than using a flat
map, I think. It also allows you to change component scopes by simply moving
them to a different factory -- presuming the hierarchy is respected, nothing
changes (say a stateful thing becomes stateless so can be moved to the
application scope, or vice versa).

Thoughts?

-Brian




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