code: public TableRef presence(final OnPresence onPresence, final OnError onError) {
  		context.presence(channel, onPresence, onError);
  		return this;
  	}
docs: Retrieves the number of the table subscriptions and their respective connection metadata (limited to the first 100 subscriptions). Each subscriber is notified of changes made to the table.
  
  <pre>
  
  StorageRef storageRef = new StorageRef("your_app_key", "your_token");
  
  TableRef tableRef = storageRef.table("your_table");
  
  tableRef.presence(new OnPresence() {
  &#064;Override
  public void run(Presence presence) {
  if (presence != null) {
  Log.d("TableRef", "Presence Subscriptions: " + String.valueOf(presence.getSubscriptions()));
  }
  }
  },new OnError() {
  &#064;Override
  public void run(Integer code, String errorMessage) {
  Log.e("TableRef", "Error : " + errorMessage);
  }
  });
  
  </pre>
  
  @param onPresence
  Response from the server when the request was completed successfully.
  @param onError
  Response if client side validation failed or if an error was returned from the server.
  @return