Android Open Source - AUIL-for-volley L R U Limited Memory Cache

• Back to Image/loader  ↑

From Project

Back to project page AUIL-for-volley.

License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *//  ww w  .j  a  v  a  2 s . c  om
 * 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.memory.impl;

import android.graphics.Bitmap;
import com.nostra13.universalimageloader.cache.memory.LimitedMemoryCache;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Limited {@link Bitmap bitmap} cache. Provides {@link Bitmap bitmaps} storing. Size of all stored bitmaps will not to
 * exceed size limit. When cache reaches limit size then the least recently used bitmap is deleted from cache.<br />
 * <br />
 * <b>NOTE:</b> This cache uses strong and weak references for stored Bitmaps. Strong references - for limited count of
 * Bitmaps (depends on cache size), weak references - for all other cached Bitmaps.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.3.0
 */
public class LRULimitedMemoryCache extends LimitedMemoryCache<String, Bitmap> {

  private static final int INITIAL_CAPACITY = 10;
  private static final float LOAD_FACTOR = 1.1f;

  /** Cache providing Least-Recently-Used logic */
  private final Map<String, Bitmap> lruCache = Collections.synchronizedMap(new LinkedHashMap<String, Bitmap>(INITIAL_CAPACITY, LOAD_FACTOR, true));

  /** @param maxSize Maximum sum of the sizes of the Bitmaps in this cache */
  public LRULimitedMemoryCache(int maxSize) {
    super(maxSize);
  }

  @Override
  public boolean put(String key, Bitmap value) {
    if (super.put(key, value)) {
      lruCache.put(key, value);
      return true;
    } else {
      return false;
    }
  }

  @Override
  public Bitmap get(String key) {
    lruCache.get(key); // call "get" for LRU logic
    return super.get(key);
  }

  @Override
  public void remove(String key) {
    lruCache.remove(key);
    super.remove(key);
  }

  @Override
  public void clear() {
    lruCache.clear();
    super.clear();
  }

  @Override
  protected int getSize(Bitmap value) {
    return value.getRowBytes() * value.getHeight();
  }

  @Override
  protected Bitmap removeNext() {
    Bitmap mostLongUsedValue = null;
    synchronized (lruCache) {
      Iterator<Entry<String, Bitmap>> it = lruCache.entrySet().iterator();
      if (it.hasNext()) {
        Entry<String, Bitmap> entry = it.next();
        mostLongUsedValue = entry.getValue();
        it.remove();
      }
    }
    return mostLongUsedValue;
  }

  @Override
  protected Reference<Bitmap> createReference(Bitmap value) {
    return new WeakReference<Bitmap>(value);
  }
}

Java Source Code List

• Back to Image/loader  ↑