/*******************************************************************************
* Copyright 2011-2014 Sergey Tarasevich
*
* 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.qmusic.volley.cache.memory.impl;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import android.graphics.Bitmap;
import com.qmusic.volley.cache.memory.MemoryCache;
/**
* Decorator for {@link MemoryCache}. Provides special feature for cache: if some cached object age exceeds defined
* value then this object will be removed from cache.
*
* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
* @see MemoryCache
* @since 1.3.1
*/
public class LimitedAgeMemoryCache implements MemoryCache {
private final MemoryCache cache;
private final long maxAge;
private final Map<String, Long> loadingDates = Collections.synchronizedMap(new HashMap<String, Long>());
/**
* @param cache Wrapped memory cache
* @param maxAge Max object age <b>(in seconds)</b>. If object age will exceed this value then it'll be removed from
* cache on next treatment (and therefore be reloaded).
*/
public LimitedAgeMemoryCache(MemoryCache cache, long maxAge) {
this.cache = cache;
this.maxAge = maxAge * 1000; // to milliseconds
}
@Override
public boolean put(String key, Bitmap value) {
boolean putSuccesfully = cache.put(key, value);
if (putSuccesfully) {
loadingDates.put(key, System.currentTimeMillis());
}
return putSuccesfully;
}
@Override
public Bitmap get(String key) {
Long loadingDate = loadingDates.get(key);
if (loadingDate != null && System.currentTimeMillis() - loadingDate > maxAge) {
cache.remove(key);
loadingDates.remove(key);
}
return cache.get(key);
}
@Override
public Bitmap remove(String key) {
loadingDates.remove(key);
return cache.remove(key);
}
@Override
public Collection<String> keys() {
return cache.keys();
}
@Override
public void clear() {
cache.clear();
loadingDates.clear();
}
}