Blog do projektu Open Source JavaHotel

sobota, 30 września 2017

Visualize car data with Brunel and Scala

There is a sample in IBM Data Science Experience "Visualize car data with Brunel". But this sample notebook is written in Python, PySpark. So I transformed it to Scala just receiving the same result but using Scala syntax. I added some comments to explain the code.
The result is published here.
To run it:

  • Download Cars+.ipynb notebook
  • Upload to Jupyter with Apache Toree-Scala (Spark) kernel enabled
  • Enjoy

wtorek, 26 września 2017

Next version of Civilization The Board Game

I deployed next version of my computer implementation of  Civilization The Board Game. The implementation consists of three parts:
New features
I implemented new, more user-friendly interface.
Single user, training game.

Two players game, real melee battle.
The opponent deck is inactive, informative only.
More user-friendly features
If figure (scout or army) is in the corner between two hidden tiles, a dialog to select one to be revealed comes up.
Figures can be stacked. If a player decided to move stacked figures, a dialog to select figures to move pops up.
After selecting an action in the left panel, squares, where action could be conducted, are highlighted.
Next steps
  • Spend trade to rush the production
  • Send production from scout to city
  • Buying units
  • Battles (?)

sobota, 23 września 2017

New version of Civilization the Board Game

I deployed next version of my computer implementation of  Civilization The Board Game. The implementation consists of three parts:
New features
  • Game progress saved
  • Game resume
  • Two players game
Game progress saved
The game is saved constantly in redis key/value database. It is done automatically in the background in a transparent way, there is no "Save" button. The server side of the game is stateless, it is only computational engine, redis datastore is a memory cache. Redis is accessed through an interface, I'm going to prepare HBase version as a warmup. Stateless is a very important feature, in the imaginative future when thousands of players are swarming, load balancing and traffic redirection can be applied. 

Game resume
A game can be left and resumed at any time. Just select a game and the player is pushed immediately into the middle of the battle.

Also, two players game can be resumed but second players should join to continue the game.
Two players game
Two options of creating new game are available: "Training" and "Two players game".

Training is a single player game, just to get one's hand in. "Two players game" is more serious matter, test yourself in hand-to-hand battle. Select opponent civilization you want to fight against and wait for the contester.

Joining the game
Select the game from the waiting list and the contester together with one who threw down the gauntlet are moved into the middle of the duel.

Leaving the game
The player can leave the game by clicking the close icon in the upper right corner of the board.
Leaving the game legally unlocks the game and remove it from the waiting list. But because the game is saved automatically while playing, event after abruptly closing the browser the game can be resumed exactly at the same stage whatsoever. The game is removed from waiting list after 24 hours of inactivity.
Next steps
Make map and player deck more user-friendly.

sobota, 9 września 2017


I created an implementation of the two methods from Oracle UTL_ENCODE package.  It is implemented as UDF Java function and DB2 module. In Java, it is simply a utilization of JVM Base64 package. More time consuming was preparing DB2 signature and test according to this article.
Full source code is here.