public static void putDisplayName(String displayName) throws JEDuplicateException {
final String UNIQUE_KEY_DISPLAY_NAME = "UniqueKeyDisplayName";
final User user = getUser();
final Key key = Datastore.createKey(JEUser.class, user.getEmail());
if (Datastore.putUniqueValue(UNIQUE_KEY_DISPLAY_NAME, displayName) == false) {
throw new JEDuplicateException("the display name is already used");
}
Transaction tx = Datastore.beginTransaction();
try {
JEUser jeUser = Datastore.getOrNull(tx, JEUser.class, key);
final long now = new Date().getTime();
if (jeUser == null) {
jeUser = new JEUser();
jeUser.setKey(key);
jeUser.setCreatedAt(now);
}
jeUser.setDisplayName(displayName);
jeUser.setUpdatedAt(now);
Datastore.put(tx, jeUser);
// TODO: Run TQ to update past's memos.
Datastore.commit(tx);
} catch (Exception e) {
Datastore.rollback(tx);
Datastore.deleteUniqueValue(UNIQUE_KEY_DISPLAY_NAME, displayName);
}
}
