content: package allen.town.focus.twitter.services;
  /*
   * 
   *
   * 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.
   */
  
  import android.content.Context;
  import android.util.Log;
  
  import androidx.annotation.NonNull;
  import androidx.work.Constraints;
  import androidx.work.ExistingPeriodicWorkPolicy;
  import androidx.work.NetworkType;
  import androidx.work.PeriodicWorkRequest;
  import androidx.work.WorkManager;
  import androidx.work.Worker;
  import androidx.work.WorkerParameters;
  
  import allen.town.focus.twitter.data.sq_lite.HomeContentProvider;
  import allen.town.focus.twitter.settings.AppSettings;
  import allen.town.focus.twitter.utils.IOUtils;
  
  import java.util.concurrent.TimeUnit;
  
  public class TrimDataService extends Worker {
  
      private final Context context;
      public TrimDataService(
              @NonNull Context context,
              @NonNull WorkerParameters params) {
          super(context, params);
          this.context = context;
      }
  
      public static final String JOB_TAG = "trim-data";
  
      public static void scheduleRefresh(Context context) {
          AppSettings settings = AppSettings.getInstance(context);
          int refreshInterval = 60 * 60 * 12; // 12 hours, as seconds
  
          PeriodicWorkRequest request =
                  new PeriodicWorkRequest.Builder(TrimDataService.class, refreshInterval, TimeUnit.SECONDS)
                          .setConstraints(new Constraints.Builder()
                                  .setRequiredNetworkType(settings.syncMobile ? NetworkType.UNMETERED : NetworkType.CONNECTED)
                                  .build())
                          .build();
          WorkManager.getInstance(context)
                  .enqueueUniquePeriodicWork(JOB_TAG, ExistingPeriodicWorkPolicy.KEEP, request);
      }
  
      @NonNull
      @Override
      public Result doWork() {
          Log.v("trimming_database", "trimming database from service");
          IOUtils.trimDatabase(getApplicationContext(), 1); // trims first account
          IOUtils.trimDatabase(getApplicationContext(), 2); // trims second account
  
          context.getContentResolver().notifyChange(HomeContentProvider.CONTENT_URI, null);
  
          return Result.success();
      }
  }
  