Hello,
You should use the following Provider:
public class TemplateResolverProvider implements Provider<TemplateResolver>
{
@Inject Injector injector;
@Override
public TemplateResolver get() {
String templateResolverClass = .......; /* some logic */
// FIXME : Wrong. Use the DI
Class<? extends TemplateResolver> templateResolver =
AppClassloader.classloader().loadClass(templateResolverClass).asSubclass(TemplateResolver.class);
TemplateResolver instance =
templateResolver.getDeclaredConstructor(TemplateRendererConfig.class).newInstance(templateRendererConfig);
injector.injectMembers(instance);
return instance;
}
}
I hope this helps.
Regards,
Olivier
2015-01-29 12:38 GMT+01:00 Stephan Classen <[email protected]>:
> Hi
>
> Will this configurable provider return the same concrete type of object
> during the whole live time of a running program?
> Or will the returned type change during runtime?
>
> Because if all you want to achieve is to be able to have mocks during unit
> test and real implementations during runtime then there are other ways to
> do this.
> There are also possibilities to change the bindings at the time the
> injector is constructed if you would need different types depending on some
> environment.
>
> The really tricky part is when you need to change the returned type during
> runtime.
>
>
>
>
> On 01/29/2015 08:10 AM, Igmar Palsenberg wrote:
>
> Hi,
>
> I'm using a Provider to dynamically provide a certain class. The
> short(ed) code :
>
>
> public class TemplateConfigurationModule extends AbstractModule {
>
> void configure() {
> bind(TemplateResolver.class).toProvider(
> TemplateResolverProvider.class).in(Singleton.class);
> }
> }
>
> public class TemplateResolverProvider implements
> Provider<TemplateResolver> {
> @Override
> public TemplateResolver get() {
> String templateResolverClass = .......; /* some logic */
> // FIXME : Wrong. Use the DI
> Class<? extends TemplateResolver> templateResolver = AppClassloader.
> classloader().loadClass(templateResolverClass).
> asSubclass(TemplateResolver.class);
> return templateResolver.getDeclaredConstructor(
> TemplateRendererConfig.class).newInstance(templateRendererConfig);
> }
> }
>
> public interface TemplateResolver() {
> .. Some stuff
> }
>
>
> public class MockTemplateResolver implements TemplateResolver {
> @Inject
> SomeObject obj;
> }
>
> So, the TemplateResolverProvider resolved a TemplateResolver class,
> which then at the end wants to provide a MockTemplateResolver. I've tried
> two things :
>
> 1) Use the normal classloader : In that case, no @Inject gets
> fullfilled. Obviously.
> 2) Use Guice to give me a TemplateResolver class
>
> The latter also fails : I want it to construct the object and do the
> injections, but it uses the Provider. Also logica.
> Then I'm kinda lost : Is there a way to solve this ? For now, I've move
> the @Inject of SomeObject to the Provider, but that doesn't feel right.
>
> Any advise ?
>
>
> Regards,
>
>
> Igmar
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--
Olivier Grégoire
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