Question

I’m using Guava in my Android application for image loading and caching theyr filenames.

Here is my cache:

private static final LoadingCache<String, String> imageCache = CacheBuilder.newBuilder()
    .softValues()
    .initialCapacity(3000)
    .maximumSize(3000)
    .concurrencyLevel(12)
    .expireAfterAccess(IMAGE_EXPIRATION_TIMEOUT, TimeUnit.SECONDS)
    .build(new CacheLoader<String, String>() {
        @Override
        public String load(String key) throws Exception {
            Log.d(TAG, "load " + key);
            Bitmap bitmap = null;

            final File imageFile = new File(cacheDir, "http---com-jWs-jpg");

            return imageFile.getPath();
        }
    });

And using:

String filename = imageCache.get(imageUrl);
Log.e(TAG, ">>> i:cache size :"+ imageCache.size() +":"+ imageCache.stats() +":"+ imageCache.asMap());
return Drawable.createFromPath(filename);

My problem is: there is 12 unique URLs in my list, but I have missCount count too large:

i:cache size :6:CacheStats{hitCount=36, missCount=48, loadSuccessCount=48, loadExceptionCount=0, totalLoadTime=46569827...)

When I’m returning simple string (like file path or simply empty string), I have only 12 misses, and other get are the hits. What I’m doing wrong?

Answer 1

Okay, got it.

.softValues() was the cause, my values was COLLECTED by garbage collector. When I commented this, everything now works fine.