How I can DRY Android retrofit calls?

user_2568343 0
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I have several repository classes in my code.

For example, this is UserRepository:

public class UserRepository {

public static String TAG = "UserRepository";

ApiService mApiService;

SharedPreferences mPrefs;
Context mContext;

RemoteDataSource<User> mRemoteDataSource;


public UserRepository() {
    mApiService = new RetrofitClient().getApiService();
    mContext = App.getAppContext();
    mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
    mRemoteDataSource = new RemoteDataSource<>();
}

public RemoteDataSource getRemoteDataSource() {
    mRemoteDataSource.setIsLoading();
    Call<ApiResponse> userCall = mApiService.getUserInfo(mPrefs.getString(User.TOKEN_NAME, null));
    userCall.enqueue(new Callback<ApiResponse>() {
        @Override
        public void onResponse(Call<ApiResponse> call, Response<ApiResponse> response) {
            mRemoteDataSource.setIsLoaded();
            mRemoteDataSource.setData(response.body().getUser());
            mRemoteDataSource.setStatus(response.body().getStatus());
            mRemoteDataSource.setMessage(response.body().getMessage());
        }

        @Override
        public void onFailure(Call<ApiResponse> call, Throwable t) {
            Log.e(TAG, t.getMessage());
            mRemoteDataSource.setFailed(t.getMessage());
        }
    });

return mRemoteDataSource;
}

}

And this is BonusRepository:

public class BonusRepository {

public static String TAG = "BonusRepository";

ApiService mApiService;

SharedPreferences mPrefs;
Context mContext;

LiveData<Bonus> mBonus;
String mId;
RemoteDataSource<Bonus> mRemoteDataSource;

public BonusRepository(String id) {
    mId = id;
    mApiService = new RetrofitClient().getApiService();
    mContext = App.getAppContext();
    mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
    mRemoteDataSource = new RemoteDataSource<>();
}

public RemoteDataSource getRemoteDataSource() {
    mRemoteDataSource.setIsLoading();
    Call<ApiResponse> bonusCall = mApiService.getBonus(mPrefs.getString(User.TOKEN_NAME, null), mId);
    bonusCall.enqueue(new Callback<ApiResponse>() {
        @Override
        public void onResponse(Call<ApiResponse> call, Response<ApiResponse> response) {
            mRemoteDataSource.setIsLoaded();
            mRemoteDataSource.setData(response.body().getBonus());
            mRemoteDataSource.setStatus(response.body().getStatus());
            mRemoteDataSource.setMessage(response.body().getMessage());
        }

        @Override
        public void onFailure(Call<ApiResponse> call, Throwable t) {
            Log.e(TAG, t.getMessage());
            mRemoteDataSource.setFailed(t.getMessage());
        }
    });
    return mRemoteDataSource;
}
}

getRemoteDataSource methods in both classes are equal, except

Call<ApiResponse> userCall = mApiService.getUserInfo(mPrefs.getString(User.TOKEN_NAME, null));

and mRemoteDataSource.setData(response.body().getUser()); in UserRepository

differs with:

Call<ApiResponse> bonusCall = ApiService.getBonus(mPrefs.getString(User.TOKEN_NAME, null), mId);

and mRemoteDataSource.setData(response.body().getBonus()); in BonusRepository.

In other repositories I have similar duplicate code.

I want to remove this duplications, but doesn't find any good solution.

What is the best way to DRY my code?

retrofit2 dry android java
1 Answers

Create an abstract class parent to all your repositories' ones, and implement the getRemoteDataSource() method, calling a new abstract method, which will be the only specific one, in each specific implementation.

For instance:

public class AbstractRepository {

protected abstract Call<ApiResponse> performCall();

public RemoteDataSource getRemoteDataSource() {
    mRemoteDataSource.setIsLoading();
    Call<ApiResponse> userCall = performCall();
    userCall.enqueue(new Callback<ApiResponse>() {
        @Override
        public void onResponse(Call<ApiResponse> call, Response<ApiResponse> response) {
            mRemoteDataSource.setIsLoaded();
            mRemoteDataSource.setData(response.body().getUser());
            mRemoteDataSource.setStatus(response.body().getStatus());
            mRemoteDataSource.setMessage(response.body().getMessage());
        }

        @Override
        public void onFailure(Call<ApiResponse> call, Throwable t) {
            Log.e(TAG, t.getMessage());
            mRemoteDataSource.setFailed(t.getMessage());
        }
    });

return mRemoteDataSource;
}

}

And then you can perform something like:

public class UserRepository extends AbstractRepository {

public static String TAG = "UserRepository";

ApiService mApiService;

SharedPreferences mPrefs;
Context mContext;

RemoteDataSource<User> mRemoteDataSource;

public UserRepository() {
    mApiService = new RetrofitClient().getApiService();
    mContext = App.getAppContext();
    mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
    mRemoteDataSource = new RemoteDataSource<>();
}

protected Call<ApiResponse> performCall() {
    return mApiService.getUserInfo(mPrefs.getString(User.TOKEN_NAME, null));
}

}

I let you adapt to your needs, but this is the best solution.

user_105242050
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