Android Open Source - lightbox-android-webservices Database Cleaner Task






From Project

Back to project page lightbox-android-webservices.

License

The source code is released under:

Apache License

If you think the Android project lightbox-android-webservices listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/**
 * Copyright (c) 2012 Lightbox//  ww w  .  ja  v a  2s  . co  m
 *
 * 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.lightbox.android.data;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

import android.util.Log;

import com.j256.ormlite.dao.Dao;
import com.j256.ormlite.stmt.PreparedQuery;
import com.lightbox.android.operations.Retrievable;
import com.lightbox.android.operations.Updatable;
import com.lightbox.android.tasks.BackgroundTask;

/** 
 * DatabaseCleanerTask 
 * @author Fabien Devos
 */
public class DatabaseCleanerTask extends BackgroundTask<Void> {
  /** Used to tag logs */
  // @SuppressWarnings("unused")
  private static final String TAG = "DatabaseCleanerTask";
    
  // Note: this is the duration for keeping data in the database, that will allow retrieving of data 
  // if OFFLINE mode. This does NOT affect the duration for returning database results rather than trying to fetching
  // the network. See RetreivingOperation for that.
  private static final long DEFAULT_DATABASE_CACHE_DURATION = 7 * 24 * 60 * 60 * 1000; // 1 week
  private static final long USER_DATABASE_CACHE_DURATION = 3 * 7 * 24 * 60 * 60 * 1000; // 3 weeks
  
  private static ExecutorService sDatabaseCleanerExecutor;
  
  /**
   * Constructor.
   */
  public DatabaseCleanerTask() {
    super(getExecutor());
  }
  
  private static ExecutorService getExecutor() {
    if (sDatabaseCleanerExecutor == null) {
      sDatabaseCleanerExecutor = Executors.newSingleThreadExecutor(
          new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
              Thread thread = new Thread(r);
              thread.setName(TAG + " | " + thread.getName());
              thread.setPriority(Thread.MIN_PRIORITY);
              return thread;
            }
          });
    }
    return sDatabaseCleanerExecutor;
  }

  @Override
  protected Void doWorkInBackground() throws Exception {
    try {
      final long DEFAULT_CUTOFF_TIME = System.currentTimeMillis() - DEFAULT_DATABASE_CACHE_DURATION;
      for (Class<?> dataClass : DatabaseHelper.getDataClasses()) {
        if (Updatable.class.isAssignableFrom(dataClass)) {
          long cutoffTime;
//          if (dataClass == User.class) {
//            cutoffTime = System.currentTimeMillis() - USER_DATABASE_CACHE_DURATION;
//          } else {
            cutoffTime = DEFAULT_CUTOFF_TIME;
//          }
          cleanUpOlderThan(cutoffTime, dataClass);
        }
      }
      
    } catch (Throwable t) {
      // We NEVER want to crash while performing a clean-up
      Log.w(TAG, "Unable to complete database clean-up.", t);
    }
    return null;
  }
  
  private static <T> void cleanUpOlderThan(long cutoffTime, Class<T> dataClass) throws Exception {
      Dao<T, String> dao = Data.getDao(dataClass);
      PreparedQuery<T> query = dao.queryBuilder()
          .where().lt(Retrievable.RETRIEVED_TIME, cutoffTime).prepare();
      List<T> oldDataList = dao.query(query);
      for (T data : oldDataList) {
        // Prevent deletion of objects with local updates
        boolean canDelete = true;
        if (data instanceof Updatable) {
          Updatable updatable = (Updatable) data;
          canDelete = (updatable.getLocallyUpdatedFields().isEmpty() && ! updatable.isMarkedAsLocallyDeleted());
        }

        if (canDelete) {
          dao.delete(data);
        }
      }
  }

  @Override
  protected void onCompleted(Void result) {
    // Nothing
  }

  @Override
  protected void onFailed(Exception e) {
    // Nothing
  }
  
}




Java Source Code List

com.lightbox.android.bitmap.BitmapFileCleanerTask.java
com.lightbox.android.bitmap.BitmapLoaderListener.java
com.lightbox.android.bitmap.BitmapLoaderTask.java
com.lightbox.android.bitmap.BitmapLoader.java
com.lightbox.android.bitmap.BitmapSize.java
com.lightbox.android.bitmap.BitmapSource.java
com.lightbox.android.bitmap.BitmapUtils.java
com.lightbox.android.cache.AbstractCache.java
com.lightbox.android.cache.ApiCache.java
com.lightbox.android.cache.BitmapCache.java
com.lightbox.android.cache.Cache.java
com.lightbox.android.data.ClearAndSaveBatchTask.java
com.lightbox.android.data.Data.java
com.lightbox.android.data.DatabaseCleanerTask.java
com.lightbox.android.data.DatabaseHelper.java
com.lightbox.android.data.DeleteBatchTask.java
com.lightbox.android.data.SaveBatchTask.java
com.lightbox.android.io.RandomAccessFileOutputStream.java
com.lightbox.android.lifecycle.LifeCycleListener.java
com.lightbox.android.lifecycle.ManagedLifeCycleActivity.java
com.lightbox.android.location.LocationHelper.java
com.lightbox.android.location.LocationListener.java
com.lightbox.android.network.HttpHelper.java
com.lightbox.android.network.NetworkUtils.java
com.lightbox.android.operations.AbstractOperation.java
com.lightbox.android.operations.CachedOperation.java
com.lightbox.android.operations.DeleteOperation.java
com.lightbox.android.operations.FailureOperation.java
com.lightbox.android.operations.ModificationNetworkOnlyOperation.java
com.lightbox.android.operations.NetworkOnlyOperation.java
com.lightbox.android.operations.OperationListener.java
com.lightbox.android.operations.OperationTask.java
com.lightbox.android.operations.Operation.java
com.lightbox.android.operations.Retrievable.java
com.lightbox.android.operations.RetrieveOperation.java
com.lightbox.android.operations.SaveOperation.java
com.lightbox.android.operations.Updatable.java
com.lightbox.android.tasks.BackgroundTaskWeak.java
com.lightbox.android.tasks.BackgroundTask.java
com.lightbox.android.tasks.DefaultExecutor.java
com.lightbox.android.utils.AndroidUtils.java
com.lightbox.android.utils.Base64.java
com.lightbox.android.utils.IntentUtils.java
com.lightbox.android.utils.MediaUtils.java
com.lightbox.android.utils.ResUtils.java
com.lightbox.android.utils.debug.DebugLifeCycleListener.java
com.lightbox.android.utils.debug.DebugLog.java
com.lightbox.android.views.RemoteImageView.java
com.lightbox.android.views.RemoteThumbImageView.java
com.lightbox.android.webservices.processors.GenerationException.java
com.lightbox.android.webservices.processors.JacksonProcessor.java
com.lightbox.android.webservices.processors.ParsingException.java
com.lightbox.android.webservices.processors.Processor.java
com.lightbox.android.webservices.requests.ApiRequestFactory.java
com.lightbox.android.webservices.requests.ApiRequestListener.java
com.lightbox.android.webservices.requests.ApiRequestTask.java
com.lightbox.android.webservices.requests.ApiRequest.java
com.lightbox.android.webservices.requests.ApiRequests.java
com.lightbox.android.webservices.requests.JacksonApiRequestFactory.java
com.lightbox.android.webservices.responses.ApiException.java
com.lightbox.android.webservices.responses.ApiResponse.java
com.lightbox.tweetsnearby.TweetsNearbyApplication.java
com.lightbox.tweetsnearby.activities.MainActivity.java
com.lightbox.tweetsnearby.activities.PickPlaceActivity.java
com.lightbox.tweetsnearby.model.Tweet.java
com.lightbox.tweetsnearby.model.Venue.java
com.lightbox.tweetsnearby.responses.foursquare.FoursquareApiResponse.java
com.lightbox.tweetsnearby.responses.foursquare.VenueListResponse.java
com.lightbox.tweetsnearby.responses.twitter.TweetListResponse.java
com.lightbox.tweetsnearby.responses.twitter.TwitterApiResponse.java