java - 我如何 DRY Android 改装电话？

Question

我的代码中有几个存储库类。

例如，这是 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;
}

}

这是 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两个类中的方法是相等的，除了

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

并mRemoteDataSource.setData(response.body().getUser());在用户存储库中

不同于：

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

mRemoteDataSource.setData(response.body().getBonus());在 BonusRepository 中。

在其他存储库中，我有类似的重复代码。

我想删除这个重复，但没有找到任何好的解决方案。

干燥我的代码的最佳方法是什么？

标签： javaandroidretrofit2dry

Answer 1

为所有存储库创建一个抽象类父级，并实现getRemoteDataSource()方法，调用一个新的抽象方法，这将是每个特定实现中唯一的特定方法。

例如：

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;
}

}

然后您可以执行以下操作：

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));
}

}

我让你适应你的需求，但这是最好的解决方案。