public static byte[] getImage(int x, int y, int zoom, HttpMapSource mapSource)
throws IOException, InterruptedException, UnrecoverableDownloadException {
MapSpace mapSpace = mapSource.getMapSpace();
int maxTileIndex = mapSpace.getMaxPixels(zoom) / mapSpace.getTileSize();
if (x > maxTileIndex)
throw new RuntimeException("Invalid tile index x=" + x + " for zoom " + zoom);
if (y > maxTileIndex)
throw new RuntimeException("Invalid tile index y=" + y + " for zoom " + zoom);
TileStore ts = TileStore.getInstance();
// Thread.sleep(2000);
// Test code for creating random download failures
// if (Math.random()>0.7) throw new
// IOException("intentionally download error");
Settings s = Settings.getInstance();
TileStoreEntry tile = null;
if (s.tileStoreEnabled) {
// Copy the file from the persistent tilestore instead of
// downloading it from internet.
tile = ts.getTile(x, y, zoom, mapSource);
boolean expired = isTileExpired(tile);
if (tile != null) {
if (expired) {
log.trace("Expired: " + mapSource.getName() + " " + tile);
} else {
log.trace("Tile of map source " + mapSource.getName() + " used from tilestore");
byte[] data = tile.getData();
notifyCachedTileUsed(data.length);
return data;
}
}
}
byte[] data = null;
if (tile == null) {
data = downloadTileAndUpdateStore(x, y, zoom, mapSource);
notifyTileDownloaded(data.length);
} else {
byte[] updatedData = updateStoredTile(tile, mapSource);
if (updatedData != null) {
data = updatedData;
notifyTileDownloaded(data.length);
} else {
data = tile.getData();
notifyCachedTileUsed(data.length);
}
}
return data;
}
