public void provideTile(TileData<T> tile) {
if (null == tile) return;
TileIndex index = tile.getDefinition();
TileCacheEntry<T> entry = _cache.get(index);
if (null != entry) entry.setTile(tile);
}
@Override
public boolean onTileReceived(TileIndex index, TileData<T> tile) {
TileCacheEntry<T> entry = _cache.get(index);
if (null != entry) {
_haveData.add(new Pair<TileIndex, Long>(index, entry.initialRequestTime()));
}
// Notify any global listeners
if (null != _globalCallbacks && !_globalCallbacks.isEmpty()) {
for (CacheRequestCallback<T> callback : _globalCallbacks) {
callback.onTileReceived(index, tile);
}
}
return false;
}
/**
* Take a list of tiles to request, and return the subset that are new requests - i.e., ones not
* already in the cache.
*
* <p>Each new request will be placed in the cache.
*
* @param requests The list of tiles needed
* @return A sublist of just those tiles not already requested
*/
public List<TileIndex> getNewRequests(Iterable<TileIndex> requests) {
List<TileIndex> needed = new ArrayList<>();
synchronized (_cache) {
for (TileIndex index : requests) {
if (!_cache.containsKey(index)) {
// Create the tile request, and listen for its fulfilment
TileCacheEntry<T> entry = new TileCacheEntry<T>(index);
entry.requestTile(_entryListener);
// Add to cache
_cache.put(index, entry);
// Add to list of keys in request order
_orderedKeys.add(index);
needed.add(index);
}
}
}
return needed;
}
@Override
public boolean shouldRemove(
Entry<TileIndex, TileCacheEntry<T>> entry,
Map<TileIndex, TileCacheEntry<T>> map,
int suggestedMaxSize) {
if (null == entry) {
return false;
} else if (null == entry.getValue()) {
return true;
} else {
TileCacheEntry<T> value = entry.getValue();
if (value.hasBeenRetrieved() || value.age() > _maxTileAge) {
// This entry has been received, or is to old for us to
// care; just remove it.
return true;
} else {
// First see if there is anything which has already been
// handled, so can be freely deleted.
for (Pair<TileIndex, Long> hasData : _haveData) {
TileIndex index = hasData.getFirst();
TileCacheEntry<T> entryWithData = _cache.get(index);
if (entryWithData.hasBeenRetrieved()) {
_cache.remove(index);
return false;
}
}
// If we get this far, there was nothing already handled.
//
// See if there's anything so old we just don't care about
// its safety any more.
if (_orderedKeys.size() > 0) {
TileIndex oldestKey = _orderedKeys.get(0);
TileCacheEntry<T> oldestEntry = _cache.get(oldestKey);
if (oldestEntry.age() > _maxTileAge) {
_cache.remove(oldestKey);
}
}
return false;
}
}
}
@Override
public void onElementRemoved(TileIndex key, TileCacheEntry<T> value) {
value.abandonTile();
}
public void provideEmptyTile(TileIndex index) {
TileCacheEntry<T> entry = _cache.get(index);
if (null != entry) entry.setTile(null);
}