Bug 324077

Description Stefan Liebig 2010-08-31 07:49:04 EDT

Created attachment 177824 [details]
SingletonProvider

We have decided to enable Riena for running under RAP. See: http://wiki.eclipse.org/Riena_on_RAP

One challenge when using RAP is that singletons need to be session dependent. When running under RCP they can stay global.
To ease handling of singletons we have created a generic SingletonProvider located in riena.core that detects whether it is running in RAP or RCP.
When running in RAP it uses the SessionSingeltonBase.getInstance() for correct handling of session dependent singletons. Otherwise singletons will be created globally.
In both cases the SingletonProvider ensures that the singletons get wired (Rienas dependency injection).

It's usage is (just an example):

public class SwtViewProvider {

	private final Map<INavigationNode<?>, SwtViewId> views;
	private final Map<String, Integer> viewCounter;
	private final HashMap<String, Boolean> viewShared;

	private static final SingletonProvider<SwtViewProvider> SVP = new SingletonProvider<SwtViewProvider>(
			SwtViewProvider.class);

	/**
	 * Gets the singleton SwtViewProvider.
	 * 
	 * @return
	 * @since 1.2
	 */
	public static SwtViewProvider getInstance() {
		return SVP.getInstance();
	}

	/**
	 * Create new instance and initialize
	 */
	protected SwtViewProvider() {

...