Backendless掛在AsynsCall

Question

我有嘗試從Backendless「問題」表中檢索數據的函數：

private static void fetchQuestionsBase() { 
      final Semaphore s = new Semaphore(0); 
      Log.d(TAG,"Inside fetch()"); 
      AsyncCallback<BackendlessCollection<Question>> callback = new AsyncCallback<BackendlessCollection<Question>>() { 
       @Override 
       public void handleResponse(BackendlessCollection<Question> response) { 
        Log.d(TAG,"Success in fetching the database"); 
        s.release(); 
        dataHolder.q = response.getData(); 
       } 
       @Override 
       public void handleFault(BackendlessFault fault) { 
        Log.e(TAG,"Failure: "+fault.getMessage()); 
        s.release(); 
       } 
      }; 
      Backendless.Data.of(Question.class).find(callback); 
      Log.d(TAG,"After Data.of..."); 
      try { 
       Log.d(TAG,"Inside try()"); 
       s.acquire(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
      Log.d(TAG,"After acquire()"); 
     } 

然而，這一項上掛着「內部嘗試（）」日誌信息。我怎樣才能瞭解更多信息並進行調試？

Answer 1

Backendless不會掛在這裏，它看起來像是信號量的問題。在handleResponse中設置一個斷點，並查看執行是否到達該點。