public static ConfigOverlay getConfigOverlay(SolrResourceLoader loader) {
InputStream in = null;
InputStreamReader isr = null;
try {
try {
in = loader.openResource(ConfigOverlay.RESOURCE_NAME);
} catch (IOException e) {
// TODO: we should be explicitly looking for file not found exceptions
// and logging if it's not the expected IOException
// hopefully no problem, assume no overlay.json file
return new ConfigOverlay(Collections.EMPTY_MAP, -1);
}
int version = 0; // will be always 0 for file based resourceLoader
if (in instanceof ZkSolrResourceLoader.ZkByteArrayInputStream) {
version = ((ZkSolrResourceLoader.ZkByteArrayInputStream) in).getStat().getVersion();
log.info("config overlay loaded . version : {} ", version);
}
isr = new InputStreamReader(in, StandardCharsets.UTF_8);
Map m = (Map) ObjectBuilder.getVal(new JSONParser(isr));
return new ConfigOverlay(m, version);
} catch (Exception e) {
throw new SolrException(ErrorCode.SERVER_ERROR, "Error reading config overlay", e);
} finally {
IOUtils.closeQuietly(isr);
IOUtils.closeQuietly(in);
}
}