/*******************************************************************************
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* Copyright 2011-2014 Sergey Tarasevich
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*******************************************************************************/
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package com.nostra13.universalimageloader.cache.memory;
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import android.graphics.Bitmap;
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import com.nostra13.universalimageloader.utils.L;
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import java.util.Collections;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* Limited cache. Provides object storing. Size of all stored bitmaps will not to exceed size limit (
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* {@link #getSizeLimit()}).<br />
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* <br />
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* <b>NOTE:</b> This cache uses strong and weak references for stored Bitmaps. Strong references - for limited count of
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* Bitmaps (depends on cache size), weak references - for all other cached Bitmaps.
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*
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* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
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* @see BaseMemoryCache
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* @since 1.0.0
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*/
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public abstract class LimitedMemoryCache extends BaseMemoryCache {
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private static final int MAX_NORMAL_CACHE_SIZE_IN_MB = 16;
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private static final int MAX_NORMAL_CACHE_SIZE = MAX_NORMAL_CACHE_SIZE_IN_MB * 1024 * 1024;
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private final int sizeLimit;
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private final AtomicInteger cacheSize;
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/**
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* Contains strong references to stored objects. Each next object is added last. If hard cache size will exceed
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* limit then first object is deleted (but it continue exist at {@link #softMap} and can be collected by GC at any
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* time)
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*/
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private final List<Bitmap> hardCache = Collections.synchronizedList(new LinkedList<Bitmap>());
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/** @param sizeLimit Maximum size for cache (in bytes) */
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public LimitedMemoryCache(int sizeLimit) {
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this.sizeLimit = sizeLimit;
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cacheSize = new AtomicInteger();
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if (sizeLimit > MAX_NORMAL_CACHE_SIZE) {
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L.w("You set too large memory cache size (more than %1$d Mb)", MAX_NORMAL_CACHE_SIZE_IN_MB);
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}
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}
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@Override
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public boolean put(String key, Bitmap value) {
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boolean putSuccessfully = false;
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// Try to add value to hard cache
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int valueSize = getSize(value);
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int sizeLimit = getSizeLimit();
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int curCacheSize = cacheSize.get();
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if (valueSize < sizeLimit) {
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while (curCacheSize + valueSize > sizeLimit) {
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Bitmap removedValue = removeNext();
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if (hardCache.remove(removedValue)) {
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curCacheSize = cacheSize.addAndGet(-getSize(removedValue));
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}
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}
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hardCache.add(value);
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cacheSize.addAndGet(valueSize);
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putSuccessfully = true;
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}
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// Add value to soft cache
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super.put(key, value);
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return putSuccessfully;
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}
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@Override
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public Bitmap remove(String key) {
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Bitmap value = super.get(key);
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if (value != null) {
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if (hardCache.remove(value)) {
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cacheSize.addAndGet(-getSize(value));
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}
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}
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return super.remove(key);
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}
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@Override
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public void clear() {
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hardCache.clear();
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cacheSize.set(0);
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super.clear();
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}
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protected int getSizeLimit() {
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return sizeLimit;
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}
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protected abstract int getSize(Bitmap value);
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protected abstract Bitmap removeNext();
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}
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