Android Open Source - AUIL-for-volley Limited Age Disc Cache

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The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 */*from   w  w w  . j  av 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.nostra13.universalimageloader.cache.disc.impl;

import com.nostra13.universalimageloader.cache.disc.BaseDiscCache;
import com.nostra13.universalimageloader.cache.disc.naming.FileNameGenerator;
import com.nostra13.universalimageloader.core.DefaultConfigurationFactory;

import java.io.File;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Cache which deletes files which were loaded more than defined time. Cache size is unlimited.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @see BaseDiscCache
 * @since 1.3.1
 */
public class LimitedAgeDiscCache extends BaseDiscCache {

  private final long maxFileAge;

  private final Map<File, Long> loadingDates = Collections.synchronizedMap(new HashMap<File, Long>());

  /**
   * @param cacheDir Directory for file caching
   * @param maxAge   Max file age (in seconds). If file age will exceed this value then it'll be removed on next
   *                 treatment (and therefore be reloaded).
   */
  public LimitedAgeDiscCache(File cacheDir, long maxAge) {
    this(cacheDir, DefaultConfigurationFactory.createFileNameGenerator(), maxAge);
  }

  /**
   * @param cacheDir          Directory for file caching
   * @param fileNameGenerator Name generator for cached files
   * @param maxAge            Max file age (in seconds). If file age will exceed this value then it'll be removed on next
   *                          treatment (and therefore be reloaded).
   */
  public LimitedAgeDiscCache(File cacheDir, FileNameGenerator fileNameGenerator, long maxAge) {
    super(cacheDir, fileNameGenerator);
    this.maxFileAge = maxAge * 1000; // to milliseconds
  }

  @Override
  public void put(String key, File file) {
    long currentTime = System.currentTimeMillis();
    file.setLastModified(currentTime);
    loadingDates.put(file, currentTime);
  }

  @Override
  public File get(String key) {
    File file = super.get(key);
    if (file.exists()) {
      boolean cached;
      Long loadingDate = loadingDates.get(file);
      if (loadingDate == null) {
        cached = false;
        loadingDate = file.lastModified();
      } else {
        cached = true;
      }

      if (System.currentTimeMillis() - loadingDate > maxFileAge) {
        file.delete();
        loadingDates.remove(file);
      } else if (!cached) {
        loadingDates.put(file, loadingDate);
      }
    }
    return file;
  }
}

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