Parse.com查询太慢，需要更快

Question

我的Parse.com查询太慢，下面的代码是1个网络通话。因此，我想并行执行3个查询：

1. 查询第0 - 200行
2. 查询第201 - 400行
3. 查询第401 - 500行

这是当前的代码：

    public static void readBusShelters() {

            ParseQuery<ParseObject> query = ParseQuery.getQuery(BusShelter.TABLE_NAME);
            query.setLimit(500);
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(List<ParseObject> list, ParseException e) {

                }
            });
    }

非常感谢一些帮助！

Answer 1

使用回调在PShape myshape; import peasy.test.*; import peasy.org.apache.commons.math.*; import peasy.*; import peasy.org.apache.commons.math.geometry.*; PeasyCam camera; void setup(){ size( 640, 480, P3D); camera = new PeasyCam(this, 0, 0, 0, 50); frameRate(10); myshape = loadShape("test.obj"); for (int i = 0; i < myshape.getVertexCount(); i++){ PVector v = myshape.getVertex(i); println("Inside"); v.x *= 45; v.y *= 45; v.z *= 45; myshape.setVertex(i, v); } } void draw(){ background(0); shape(myshape); } 中包装解析查询并在线程池上执行以使任务能够并行运行。

示例：

AsyncTask

回调：

public class MainActivity extends AppCompatActivity implements OnTaskCompleted {

  @Override
  public void onTaskCompleted(List<ParseObject> response) {

  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    new FetchParseQueryTask(MainActivity.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new PagingOptions(0, 200));
    new FetchParseQueryTask(MainActivity.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new PagingOptions(1, 200));
    new FetchParseQueryTask(MainActivity.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new PagingOptions(2, 200));
  }
}

public interface OnTaskCompleted { void onTaskCompleted(List<ParseObject> response); } 类的示例实现：

FetchParseQueryTask

public class FetchParseQueryTask extends AsyncTask<PagingOptions, Void, List<ParseObject>> { private OnTaskCompleted mTaskCompleted; public FetchParseQueryTask(OnTaskCompleted activityContext){ mTaskCompleted = activityContext; } @Override protected List<ParseObject> doInBackground(PagingOptions... params) { PagingOptions pagingOptions = params[0]; ParseQuery<ParseObject> query = ParseQuery.getQuery("TABLE_NAME"); query.setLimit(pagingOptions.getLimit()); query.setSkip(pagingOptions.getPage() * pagingOptions.getLimit()); try { return query.find(); } catch (ParseException e) { e.printStackTrace(); } return null; } protected void onPostExecute(List<ParseObject> result) { super.onPostExecute(result); if (mTaskCompleted != null) { mTaskCompleted.onTaskCompleted(result); } } } 上课：

PagingOptions