在 android 客户端和 GAE 端点之间共享类

Question

1)我从model模块做了一个依赖，里面有一个UserModel class。但我无法将其导入客户端，因为我的端点 api getUser 方法 returns com.example.serjsmor.backend.userModelApi.model.UserModel，而不是 com.serjsmor.digitalpheromone.module.UserModel。我可以将这个生成的 class 导入我的客户端，但是我的依赖有什么意义呢？

2) 我所做的任何更改 UserModel 都不会影响生成的后端 class（比如添加另一个 Ctor）。如何让后端在更改后再次重新编译它？（尝试 add/remove、重建、清理等）

我在 Yosemite

上使用 Android Studio 1.02

客户代码：

package com.serjsmor.digitalpheromone;

import com.example.serjsmor.backend.userModelApi.UserModelApi;
import com.example.serjsmor.backend.userModelApi.model.UserModel;
import com.google.android.gms.maps.model.LatLng;
import com.google.api.client.extensions.android.http.AndroidHttp;
import com.google.api.client.extensions.android.json.AndroidJsonFactory;
import com.google.api.client.googleapis.services.AbstractGoogleClientRequest;
import com.google.api.client.googleapis.services.GoogleClientRequestInitializer;
import com.serjsmor.digitalpheromone.module.UserAlreadyExistsException;
import com.serjsmor.digitalpheromone.module.UserNotFoundException;
import com.serjsmor.digitalpheromone.pheromones.Pheromone;

import java.io.IOException;
import java.util.ArrayList;

public class EndpointsServer implements Server {

    private static final String TAG = "EndpointsServer";

    final UserModelApi userEndpointsApi;

    public EndpointsServer() {
        UserModelApi.Builder builder = new UserModelApi.Builder(AndroidHttp.newCompatibleTransport(), new AndroidJsonFactory(), null)
                .setRootUrl("http://10.0.2.2:8080/_ah/api/")
                .setGoogleClientRequestInitializer(new GoogleClientRequestInitializer() {
                    @Override
                    public void initialize(AbstractGoogleClientRequest<?> abstractGoogleClientRequest) throws IOException {
                        abstractGoogleClientRequest.setDisableGZipContent(true);
                    }
                });

        userEndpointsApi = builder.build();

    }

    @Override
    public User getUser(String email)  {
        User  user = null;
        try {
            Log.d(TAG, "in getUser with email " +email);
            // get user from db
            UserModel userModel = userEndpointsApi.getUserModel(email).execute();
            if (userModel != null) {
                Log.d(TAG, "user != null with email " + email);
                user = new User(userModel);
            }
            else { // add user to db
                Log.d(TAG, "user == null with email " + email);
                user = new User(email);
                UserModel afterInsert = userEndpointsApi.storeUserModel(user.getUserModel()).execute();
                Log.d(TAG, "after insert user email" + afterInsert.getEmail());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return user;
    }
}

端点：

package com.example.serjsmor.myapplication.backend;

import com.google.api.server.spi.config.Api;
import com.google.api.server.spi.config.ApiMethod;
import com.google.api.server.spi.config.ApiNamespace;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.EntityNotFoundException;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import com.google.appengine.api.datastore.Transaction;
import com.serjsmor.digitalpheromone.module.UserAlreadyExistsException;
import com.serjsmor.digitalpheromone.module.UserModel;
import com.serjsmor.digitalpheromone.module.UserNotFoundException;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.inject.Named;


/**
 * An endpoint class we are exposing
 */
@Api(
        name = "userModelApi",
        version = "v1",
        resource = "userModel",
        namespace = @ApiNamespace(
                ownerDomain = "backend.myapplication.serjsmor.example.com",
                ownerName = "backend.myapplication.serjsmor.example.com",
                packagePath = ""
        )
)
public class UserModelEndpoint {

    private static final Logger logger = Logger.getLogger(UserModelEndpoint.class.getName());

    /**
     * This method gets the <code>UserModel</code> object associated with the specified <code>email</code>.
     *
     * @param email The id of the object to be returned.
     * @return The <code>UserModel</code> associated with <code>id</code>.
     */
    @ApiMethod(name = "getUserModel")
    public UserModel getUserModel(@Named("email") String email) throws UserNotFoundException {
        logger.log(Level.INFO, "serj.pheromone.BeanEndpoint inside getUserModel");
        logger.log(Level.INFO, "serj.pheromone.BeanEndpoint email" + email);
        DatastoreService datastoreService = DatastoreServiceFactory.getDatastoreService();
        UserModel user = null;
//        throw new UserNotFoundException();
        try {
            Key k = KeyFactory.createKey(UserModel.class.getSimpleName(), email);
            logger.log(Level.INFO, "serj.pheromone.BeanEndpoint key ");
            Entity entity = datastoreService.get(k);
            user = new UserModel();
            user.setEmail(email);
            user.setNickname((String) entity.getProperty("nickname"));

        } catch (EntityNotFoundException e) {
            return null;

        }

        return user;
    }




 }

模型依赖：

package com.serjsmor.digitalpheromone.module; 

import com.serjsmor.digitalpheromone.module.PheromoneModel;
import java.util.List;


public class UserModel {

    protected String email;
    protected String nickname;
    protected List<PheromoneModel> pheromoneList;

    public UserModel() {

    }

    public UserModel(String email, String nickname) {
        this.email = email;
        this.nickname = nickname;
    }

    public UserModel(String email, String firstName, String lastName) {
        this.email = email;
        this.nickname = firstName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public List<PheromoneModel> getPheromoneList() {
        return pheromoneList;
    }

    public void setPheromoneList(List<PheromoneModel> pheromoneList) {
        this.pheromoneList = pheromoneList;
    }
}

Answer 1

忘了回答，我有一个神秘的编译错误，直到我手动启动所有 gradle 任务，尤其是 get ClientLibs 任务后才出现。 More on debugging gradle。

Answer 2

我不确定答案，即使我遇到了同样的问题。但是，您可以通过使用 Google 的 Gson 库从后端摆脱这种模棱两可的 class。例如，如果您的应用中有 Grocery.class，后端有 GroceryBackend.class，并且您确定这两个 class 具有相同的字段，则执行以下操作:

Gson groceryGson = new Gson();
Grocery grocery = groceryGson.fromJson(groceryGson.toJson(groceryBackend), Grocery.class);

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