@Override
protected Bitmap doInBackground(Object... params) {
InputStream inStream = null;
try {
String scaledCacheKey =
getCacheKey(
mUrl,
mDownloadRequest.getListener().getDesiredWidth(),
mDownloadRequest.getListener().getDesiredHeight());
Snapshot snapshot = mDiskCache.get(scaledCacheKey);
if (snapshot != null) {
inStream = snapshot.getInputStream(0);
return Bitmaps.safeDecodeStream(inStream);
}
snapshot = mDiskCache.get(getCacheKey(mUrl));
if (snapshot != null) {
inStream = snapshot.getInputStream(0);
return Bitmaps.safeDecodeStream(snapshot.getInputStream(0));
}
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
IO.closeQuietly(inStream);
}
}
public void queryCache(String url, ImageCacheListener listener, DownloadRequest downloadRequest) {
if (url == null) {
listener.onImageNotFound(this, url, downloadRequest);
return;
}
String fullSizeCacheKey = getCacheKey(url);
String scaledCacheKey = "";
int desiredWidth = downloadRequest.getListener().getDesiredWidth();
int desiredHeight = downloadRequest.getListener().getDesiredHeight();
if (desiredWidth > 0 && desiredHeight > 0) {
scaledCacheKey = getCacheKey(url, desiredWidth, desiredHeight);
synchronized (mMemoryCache) {
Bitmap scaledBitmap = mMemoryCache.get(scaledCacheKey);
if (scaledBitmap != null) {
listener.onImageFound(this, scaledBitmap, url, downloadRequest);
return;
}
}
}
// First check the in-memory cache...
synchronized (mMemoryCache) {
Bitmap cachedBitmap = mMemoryCache.get(fullSizeCacheKey);
if (cachedBitmap != null) {
// ...notify listener immediately, no need to go async
listener.onImageFound(this, cachedBitmap, url, downloadRequest);
return;
}
}
if (mDiskCache != null) {
ThreadPoolAsyncTaskRunner.runTaskOnPool(
ThreadPoolAsyncTaskRunner.THUMBNAIL_THREAD_POOL,
new BitmapDecoderTask(url, listener, downloadRequest),
(Object[]) null);
return;
}
listener.onImageNotFound(this, url, downloadRequest);
}