Android Open Source - lightbox-android-webservices Bitmap File Cleaner Task

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License

The source code is released under:
Apache License
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Java Source Code

/**
 * Copyright (c) 2012 Lightbox//from w  w w .ja v a 2s  .com
 *
 * 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.bitmap;

import java.io.File;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.comparator.LastModifiedFileComparator;

import android.util.Log;

import com.lightbox.android.tasks.BackgroundTask;
import com.lightbox.android.utils.debug.DebugLog;

/** 
 * BitmapFileCleanerTask 
 * @author Fabien Devos
 */
public class BitmapFileCleanerTask extends BackgroundTask<Void> {
  /** Used to tag logs */
  // @SuppressWarnings("unused")
  private static final String TAG = "BitmapFileCleanerTask";

  private static final long MAX_DISK_CACHE_SIZE = 200 * 1000 * 1000; // (in bytes)
  
  private static ExecutorService sBitmapFileCleanerExecutor;
  
  private long mCleanupDuration;
  
  /**
   * Constructor.
   * @param newSingleThreadExecutor
   */
  public BitmapFileCleanerTask() {
    super(getExecutor());
  }
  
  private static ExecutorService getExecutor() {
    if (sBitmapFileCleanerExecutor == null) {
      sBitmapFileCleanerExecutor = 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 sBitmapFileCleanerExecutor;
  }

  @Override
  protected Void doWorkInBackground() throws Exception {
    mCleanupDuration = System.currentTimeMillis();
    DebugLog.d(TAG, "started file cleanup");
// TODO    
//    File photoCacheDir = new File(Photo.CACHE_DIRECTORY);
//    
//    try {
//      // If we are above the max cache size, delete files until we are below the limit
//      long cacheDirSize = FileUtils.sizeOfDirectory(photoCacheDir);
//      if (cacheDirSize > MAX_DISK_CACHE_SIZE) {
//        List<File> files = getFilesSortedByLastModifiedReverse(photoCacheDir);
//        for (File file : files) {
//          if (cacheDirSize < MAX_DISK_CACHE_SIZE) {
//            break;
//          } else {
//            cacheDirSize -= FileUtils.sizeOf(file);
//            FileUtils.deleteQuietly(file);
//          }
//        }
//      }
//    } catch (Throwable t) {
//      // We NEVER want to crash while simply performing cleaning
//      Log.w(TAG, "Unable to complete photo cache clean-up.", t);
//    }
    return null;
  }

  private static List<File> getFilesSortedByLastModifiedReverse(File dir) {
    DebugLog.d(TAG, "starting getFilesSortedByLastModifiedReverse");
    File[] filesArray = dir.listFiles();
    Arrays.sort(filesArray, LastModifiedFileComparator.LASTMODIFIED_REVERSE);
    DebugLog.d(TAG, "finshed getFilesSortedByLastModifiedReverse");
    return Arrays.asList(filesArray);
  }
  
  @Override
  protected void onCompleted(Void result) {
    // Nothing
    mCleanupDuration = System.currentTimeMillis() - mCleanupDuration;
    DebugLog.d(TAG, "finished file cleanup: "+mCleanupDuration+"ms");
  }

  @Override
  protected void onFailed(Exception e) {
    // Nothing
    mCleanupDuration = System.currentTimeMillis() - mCleanupDuration;
    DebugLog.d(TAG, "file cleanup failed: "+mCleanupDuration+"ms");
  }
}
Java Source Code List
