Dagger 2 injecting two retrofit objects

Question

I'm using Dagger 2 with retrofit2 library while using MVP. Everything went well till I tried to integrate another service (basically I tried to initialize another retrofit object to another service). I followed this answer but without any success.

Every time I'm getting an errors that each of my fragments and application classes don't seem to recognize the component classes.

error: cannot find symbol class DaggerApplicationComponent error: cannot find symbol class DaggerEpisodeComponent

Code

ApplicationComponent

@Singleton
@Component(modules = ApplicationModule.class)
public interface ApplicationComponent {

    Retrofit exposeStreamingRetrofit();

    Retrofit exposeRetrofit();

    Context exposeContext();

    AppPreferenceHelper exposePrefs();

}

Application Module

   @Module
public class ApplicationModule
{
    private String mBaseUrl;
    private Context mContext;
    private AppPreferenceHelper mPrefsHelper;

    public ApplicationModule(Context context,String baseUrl)
    {
        mContext = context;
        mBaseUrl = baseUrl;
        mPrefsHelper = new AppPreferenceHelper(context, Consts.PREF_NAME);
    }


    @Singleton
    @Provides
    GsonConverterFactory provideGsonConverterFactory()
    {
        GsonConverterFactory gsonConverterFactory = GsonConverterFactory.create();
        return gsonConverterFactory;
    }

    @Singleton
    @Provides
    @Named("ok-1")
    OkHttpClient provideOkHttpClient()
    {

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);

        return new OkHttpClient().newBuilder()
                .connectTimeout(500, TimeUnit.MILLISECONDS)
                .readTimeout(500,TimeUnit.MILLISECONDS)
                .addInterceptor(logging)
                .build();
    }

    @Singleton
    @Provides
    RxJava2CallAdapterFactory provideRxJava2CallAdapterFactory()
    {
        return RxJava2CallAdapterFactory.create();
    }

    @Provides
    @Singleton
    Retrofit provideRetrofit(@Named("ok-1") OkHttpClient client, GsonConverterFactory convectorFactory, RxJava2CallAdapterFactory adapterFactory)
    {
        return new Retrofit.Builder()
                .baseUrl(mBaseUrl)
                .addConverterFactory(convectorFactory)
                .addCallAdapterFactory(adapterFactory)
                .client(client)
                .build();
    }

    @Provides
    @Singleton
    Retrofit provideStreamingRetrofit(@Named("ok-1") OkHttpClient client, GsonConverterFactory convectorFactory, RxJava2CallAdapterFactory adapterFactory) {
        return new Retrofit.Builder()
                .baseUrl(Consts.STREAMING_BASE_PATH)
                .addConverterFactory(convectorFactory)
                .addCallAdapterFactory(adapterFactory)
                .client(client)
                .build();
    }

    @Singleton
    @Provides
    Context provideContext()
    {
        return mContext;
    }

    @Singleton
    @Provides
    AppPreferenceHelper provideAppPreferenceHelper(){
        return mPrefsHelper;
    }

}

StreamingService

public interface StreamingService
{
    @GET("search")
    Observable<StreamingItems> getStreamingItems(@Query("keyword") String query);
}

Streaming Module @Module

public class StreamingModule
{
    private StreamingView mView;

    public StreamingModule(StreamingView view)
    {
        mView = view;
    }

    @PerFragment
    @Provides
    StreamingService provideStreamingService(Retrofit retrofit)
    {
        return retrofit.create(StreamingService.class);
    }

    @PerFragment
    @Provides
    StreamingView provideView()
    {
        return mView;
    }

    public void disposeView()
    {
        mView = null;
    }
}

Streaming component

@PerFragment
@Component(modules = StreamingModule.class, dependencies = ApplicationComponent.class)
public interface StreamingComponent {
    void inject(StreamingFragment streamingFragment);
}

Streaming Presenter

public class StreamingPresenter extends BasePresenter<StreamingView>
{
    private long                    mMaxPagesOfTopSeries;

    @Inject
    protected StreamingService mApiService;

    @Inject
    protected Mapper                mTopSeriesMapper;

    @Inject
    protected AppPreferenceHelper   mPrefsHelper;

    @Inject
    public StreamingPresenter()
    {
        mMaxPagesOfTopSeries = 1;

    }
}

The problem might be connected to the exposing another instance of Retrofit in the component application class, but I'm not sure.

Update 1

EpisodeModule

@PerFragment
@Component (modules = EpisodeModule.class, dependencies = ApplicationComponent.class)
public interface EpisodeComponent
{
    void inject(EpisodeFragment episodeFragment);
}

After I created the streaming classes (service, presenter, module, component) I didn't change anything in other classes so I think the problem is somewhere in Application module/component or streaming classes but I'm not sure because I might change the retrofit object for the other fragments because I added a new instance of retrofit for streaming.

Answer 1

You are right the problem is the second exposed instance of Retrofit in application module.The solution is to use dagger qualifiers. Just replace appropriate code blocks with:

Define retrofit provider with qualifier @Named("streaming") in Application Module

@Provides
@Singleton
@Named("streaming")
Retrofit provideStreamingRetrofit(@Named("ok-1") OkHttpClient client, GsonConverterFactory convectorFactory, RxJava2CallAdapterFactory adapterFactory) {
    return new Retrofit.Builder()
            .baseUrl(Consts.STREAMING_BASE_PATH)
            .addConverterFactory(convectorFactory)
            .addCallAdapterFactory(adapterFactory)
            .client(client)
            .build();
}

Don't foreget to expose retrofit instance with exact same qualifier in Application Component

@Singleton
@Component(modules = ApplicationModule.class)
public interface ApplicationComponent {

    @Named("streaming") Retrofit exposeStreamingRetrofit();

    Retrofit exposeRetrofit();

    Context exposeContext();

    AppPreferenceHelper exposePrefs();

}

Whenever you need the streaming service retrofit instance - don't forget to set qualifier. Example in Streaming Module

@PerFragment
@Provides
StreamingService provideStreamingService(@Named("streaming") Retrofit retrofit) {
    return retrofit.create(StreamingService.class);
}