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Use of DI in extension [message #898660]

Fri, 27 July 2012 06:31

Stefan Wiese

Messages: 12
Registered: July 2011

Junior Member

I've created an extension point in plugin a and an extension in plugin b.
The extension has a dependency to ECommandService, EHandlerService and MApplication. All dependencies are null. I tried to inject an IEclipseContext in ctor but it is null.
What do I have to pay attention for when using DependencyInjection in extensions?
Is it in general possible?

Stefan

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Re: Use of DI in extension [message #898668 is a reply to message #898660]

Fri, 27 July 2012 06:50

Stefan Wiese

Messages: 12
Registered: July 2011

Junior Member

Ah, here's the solution:
When evaluating the extensions simply call ContextInjectionFactory.inject(context);

@Inject
public OpenSearchHandler(ISearchComponent searchComponent, IEclipseContext context, IExtensionRegistry registry)
	{
		IConfigurationElement[] extensions = registry
			.getConfigurationElementsFor("my.own.extensionpoint.definition.searchprovider");

		for (IConfigurationElement extension : extensions)
		{
			LOG.debug("Evaluating extension");
			try
			{
				final Object o = extension.createExecutableExtension("class");
				if (o instanceof SearchProvider)
				{
					SearchProvider searchProvider = (SearchProvider) o;
					LOG.debug("Found SearchProvider --> " + searchProvider.getLabel());
					ContextInjectionFactory.inject(searchProvider, context);
					searchComponent.addSearchProvider(searchProvider);
				}
			}
			catch (CoreException e)
			{
				LOG.error(e);
			}
		}

	}

Stefan

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Re: Use of DI in extension [message #898670 is a reply to message #898660]

Fri, 27 July 2012 06:52

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

No extension points currently can't use DI. We'd need a special way to
create instances by routing the IEclipseContext to the creation.

IIRC there is a feature request in bugzilla but I can't remember the
name. As a replacement for an extension point one can see
ContextFunctions who can be contributed through DS.

Tom

Am 27.07.12 08:31, schrieb Stefan Wiese:
> I've created an extension point in plugin a and an extension in plugin b.
> The extension has a dependency to ECommandService, EHandlerService and
> MApplication. All dependencies are null. I tried to inject an
> IEclipseContext in ctor but it is null.
> What do I have to pay attention for when using DependencyInjection in
> extensions? Is it in general possible?
>
> Stefan

Report message to a moderator

Re: Use of DI in extension [message #898681 is a reply to message #898668]

Fri, 27 July 2012 07:52

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

Yes that's a solution - but it doesn't allow to use constructor
injection, and @PostConstruct. I'd like to that the IExtensionRegistry
injected here is using the IEclipseContext to create instances using
ContextInjectionFactory.make.

Tom

Am 27.07.12 08:50, schrieb Stefan Wiese:
> Ah, here's the solution:
> When evaluating the extensions simply call
> ContextInjectionFactory.inject(context);
>
>
> @Inject
> public OpenSearchHandler(ISearchComponent searchComponent,
> IEclipseContext context, IExtensionRegistry registry)
> {
> IConfigurationElement[] extensions = registry
>
> .getConfigurationElementsFor("my.own.extensionpoint.definition.searchprovider");
>
>
> for (IConfigurationElement extension : extensions)
> {
> LOG.debug("Evaluating extension");
> try
> {
> final Object o =
> extension.createExecutableExtension("class");
> if (o instanceof SearchProvider)
> {
> SearchProvider searchProvider = (SearchProvider) o;
> LOG.debug("Found SearchProvider --> " +
> searchProvider.getLabel());
> ContextInjectionFactory.inject(searchProvider,
> context);
> searchComponent.addSearchProvider(searchProvider);
> }
> }
> catch (CoreException e)
> {
> LOG.error(e);
> }
> }
>
> }
>
>
> Stefan

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