Package org.glassfish.jersey

Class InjectionManagerProvider

java.lang.Object
org.glassfish.jersey.InjectionManagerProvider
Direct Known Subclasses:
InjectionManagerClientProvider
public class InjectionManagerProvider extends Object
Utility class with static methods that extract injection manager from various JAX-RS components. This class can be used when no injection is possible by Context or Inject annotation due to character of provider but there is a need to get any service from InjectionManager.

Injections are not possible for example when a provider is registered as an instance on the client. In this case the runtime will not inject the instance as this instance might be used in other client runtimes too.

Example. This is the class using a standard injection: 

     public static class MyWriterInterceptor implements WriterInterceptor {
         @Inject
         MyInjectedService service;

         @Override
         public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException {
             Something something = service.getSomething();
             ...
         }

     }

If this injection is not possible then this construct can be used: 

     public static class MyWriterInterceptor implements WriterInterceptor {

         @Override
         public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException {
             InjectionManager injectionManager = InjectionManagerProvider.getInjectionManager(context);
             MyInjectedService service = injectionManager.getInstance(MyInjectedService.class);
             Something something = service.getSomething();
             ...
         }
     }

Note, that this injection support is intended mostly for injection of custom user types. JAX-RS types are usually available without need for injections in method parameters. However, when injection of custom type is needed it is preferred to use standard injections if it is possible rather than injection support provided by this class.

User returned InjectionManager only for purpose of getting services (do not change the state of the injection manager).

Since:
2.6
Author:
Miroslav Fuksa