content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.example.android.persistence;
  
  import androidx.lifecycle.LiveData;
  import androidx.lifecycle.Observer;
  import androidx.annotation.Nullable;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  public class LiveDataTestUtil {
  
      /**
       * Get the value from a LiveData object. We're waiting for LiveData to emit, for 2 seconds.
       * Once we got a notification via onChanged, we stop observing.
       */
      public static <T> T getValue(final LiveData<T> liveData) throws InterruptedException {
          final Object[] data = new Object[1];
          final CountDownLatch latch = new CountDownLatch(1);
          Observer<T> observer = new Observer<T>() {
              @Override
              public void onChanged(@Nullable T o) {
                  data[0] = o;
                  latch.countDown();
                  liveData.removeObserver(this);
              }
          };
          liveData.observeForever(observer);
          latch.await(2, TimeUnit.SECONDS);
          //noinspection unchecked
          return (T) data[0];
      }
  }
  