Android Open Source - SIC Soft Cache

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License

The source code is released under:

MIT License

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Java Source Code

package com.sun.imageloader.cache.impl;
/*ww w. ja va 2  s. c o m*/
import java.lang.ref.Reference;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;


import com.sun.imageloader.cache.api.MemoryCache;

public abstract class SoftCache<K, V> implements MemoryCache<K, V> {

  private int _maxSizeMemory;
  private final Map<K, Reference<V>> _lruSoftMap;
  public final static int ONE_MB = 1024 * 1024;

  /**
   * Abstract class which implements a SoftCache of references. This allows any objects to be removed at the garbage collectors own will.
   * 
   * @param maxSizeMemory_
   *       the max memory the cache should consume in MB. For example, a value of 1 will limit the cache to consume no more than 1MB.
   */
  public SoftCache(int maxSizeMemory_) {
    _lruSoftMap = new ConcurrentHashMap<K, Reference<V>>(20, 0.75f);
    _maxSizeMemory = maxSizeMemory_ * ONE_MB;
  }

  /**
   * The size of the the object in the cache, measured in bytes
   *  
   * @param value_
   * @return
   */
  protected abstract float sizeOfValue(V value_);
  
  protected int getMaxCacheSizeInMB(){
    return _maxSizeMemory;
  }

  @Override
  public boolean put(K key_, V value_) {

    _lruSoftMap.put(key_, creatObjectReference(value_));

    return true;
  }

  protected abstract Reference<V> creatObjectReference(V value_);

  @Override
  public V getValue(K key_) {
    Reference<V> valueReference = _lruSoftMap.get(key_);

    if (valueReference != null) {
      V value = valueReference.get();
      return value;
    } else {
      return null;
    }

  }

  
  protected void remove(K key_) {
    _lruSoftMap.remove(key_);

  }

  @Override
  public void clear() {
    _lruSoftMap.clear();

  }

  @Override
  public Collection<K> getKeys() {
    Set<K> keySet = _lruSoftMap.keySet();
    return keySet;
  }
}

Java Source Code List