我試圖改進我的Android持久層用於多個應用程序。存儲庫模式與存儲庫工廠
是我迄今所做的是要建立一個基礎庫的抽象類,也是一個基礎庫接口,完整的代碼可以點擊這裏:https://github.com/grmaciel/android-repository-ormlite
接口:現在所有
public interface IRepository<T, Id> {
public void save(T entity) throws SQLException;
public void saveBatch(List<T> entities) throws Exception;
public List<T> queryAll() throws SQLException;
public T findById(Id id) throws SQLException;
public void delete(T entity) throws SQLException;
}
我存儲庫擴展我的基礎知識庫,如下所示:
public class DependencyRepository extends BaseRepository<Dependency>
implements IDependenceyRepository {
public DependencyRepository(Context context) {
super(context);
}
}
我現在想實現的目標是創建一個存儲庫工廠,允許pe德隆到不一定要建立自己的倉庫遍佈與new Instance()
的地方我所做的就是創建一個Singleton工廠必須與具有階級關係的容器進行初始化,像這樣:
public abstract class BaseRepositoryContainer {
private final Context context;
public BaseRepositoryContainer(Context context) {
this.context = context;
}
public abstract <T extends IRepository> Map<Class<T>, Class<T>> getRepositoriesMap();
public Context getContext() {
return context;
}
}
工廠:
public class RepositoryFactory {
private Map<Object, Object> repositories = new HashMap<>();
private final String LOG_TAG = RepositoryFactory.class.getSimpleName();
private Context context;
private static RepositoryFactory instance;
private BaseRepositoryContainer container;
private RepositoryFactory() {}
public void init(BaseRepositoryContainer container) {
this.container = container;
this.context = container.getContext();
this.configureRepositories(container.getRepositoriesMap());
}
private <T extends IRepository> void configureRepositories(Map<Class<T>, Class<T>> repositoriesMap) {
for (Entry<Class<T>, Class<T>> entry : repositoriesMap.entrySet()) {
this.registerRepository(entry.getKey(), entry.getValue());
}
}
private <T extends IRepository> void registerRepository(Class<T> repInterface, Class<T> realRepository) {
repositories.put(repInterface, this.createRepository(realRepository));
}
public <T extends IRepository> T getRepository(Class<T> repInterface) {
if (container == null) {
throw new UnsupportedOperationException("You should call init method providing a container.");
}
return (T) repositories.get(repInterface);
}
private <T extends IRepository> T createRepository(Class<T> repoClass) {
try {
T instance = repoClass.getConstructor(Context.class).newInstance(context);
Log.d(LOG_TAG, "Repository " + repoClass.getSimpleName() + " created");
return instance;
} catch (InstantiationException e) {
Log.d(LOG_TAG, e.toString());
} catch (IllegalAccessException e) {
Log.d(LOG_TAG, e.toString());
} catch (InvocationTargetException e) {
Log.d(LOG_TAG, e.toString());
} catch (NoSuchMethodException e) {
Log.d(LOG_TAG, e.toString());
}
return null;
}
public static RepositoryFactory getInstance() {
if (instance == null) {
instance = new RepositoryFactory();
}
return instance;
}
}
然後它可以被稱爲是這樣的:
// when the application is first run
RepositoryFactory.getInstance().init(new RepositoryContainer(this));
// retreaving the repository
IDependenceyRepository repository = RepositoryFactory.getInstance()
.getRepository(IDependenceyRepository.class);
所以我想知道這是一個很好的方法來幫助實現抽象嗎?我不喜歡在沒有強制要求的情況下調用工廠的初始化方法,唯一的方法是知道如果你不打電話會拋出一個我不喜歡的異常。
有沒有人能指出我正確的方向?一種改進這種設計的方法?我不想在後來的項目中發現我創建了很多強大的依賴項,並且很難改變某些內容。
任何意見,將不勝感激。