public ItemLoadedFuture getPdu(
Uri uri, boolean requestSlideshow, final ItemLoadedCallback<PduLoaded> callback) {
if (uri == null) {
throw new NullPointerException();
}
PduCacheEntry cacheEntry = null;
synchronized (mPduCache) {
if (!mPduCache.isUpdating(uri)) {
cacheEntry = mPduCache.get(uri);
}
}
final SlideshowModel slideshow =
(requestSlideshow && !DEBUG_DISABLE_CACHE) ? mSlideshowCache.get(uri) : null;
final boolean slideshowExists = !requestSlideshow || slideshow != null;
final boolean pduExists = cacheEntry != null && cacheEntry.getPdu() != null;
final boolean taskExists = mPendingTaskUris.contains(uri);
final boolean newTaskRequired = (!pduExists || !slideshowExists) && !taskExists;
final boolean callbackRequired = callback != null;
if (pduExists && slideshowExists) {
if (callbackRequired) {
PduLoaded pduLoaded = new PduLoaded(cacheEntry.getPdu(), slideshow);
callback.onItemLoaded(pduLoaded, null);
}
return new NullItemLoadedFuture();
}
if (callbackRequired) {
addCallback(uri, callback);
}
if (newTaskRequired) {
mPendingTaskUris.add(uri);
Runnable task = new PduTask(uri, requestSlideshow);
mExecutor.execute(task);
}
return new ItemLoadedFuture() {
private boolean mIsDone;
public void cancel(Uri uri) {
cancelCallback(callback);
removePdu(uri); // the pdu and/or slideshow might be half loaded. Make sure
// we load fresh the next time this uri is requested.
}
public void setIsDone(boolean done) {
mIsDone = done;
}
public boolean isDone() {
return mIsDone;
}
};
}
public PduLoaderManager(final Context context) {
super(context);
mSlideshowCache = new SimpleCache<Uri, SlideshowModel>(8, 16, 0.75f, false);
mPduCache = PduCache.getInstance();
mPduPersister = PduPersister.getPduPersister(context);
mContext = context;
}
@Override
public void clear() {
super.clear();
synchronized (mPduCache) {
mPduCache.purgeAll();
}
mSlideshowCache.clear();
}
public void removePdu(Uri uri) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "removePdu: " + uri);
}
if (uri != null) {
synchronized (mPduCache) {
mPduCache.purge(uri);
}
mSlideshowCache.remove(uri);
}
}