public void completeGroup(Object groupId) {
   Assert.notNull(groupId, "'groupId' must not be null");
   SimpleMessageGroup messageGroup = this.buildMessageGroup(groupId, true);
   messageGroup.complete();
   this.doStore(MESSAGE_GROUP_KEY_PREFIX + groupId, new MessageGroupMetadata(messageGroup));
 }
 public void completeGroup(Object groupId) {
   SimpleMessageGroup group = getMessageGroupInternal(groupId);
   group.complete();
 }