public int updateAvatarBatch(File zipFile) {
String tmpPath = System.getProperty("java.io.tmpdir") + "/avatar/";
logger.debug("unzip avatar to {}", tmpPath);
ZipUtils.unzip(zipFile, tmpPath);
File tmpAvatar = new File(tmpPath);
int count = updateFile(tmpAvatar);
logger.debug("removing avatar tmp path {}", tmpPath);
tmpAvatar.delete();
return count;
}