DDevelopment & Design

GWTaculous – visual effects on the loose !

GWTaculous is open source visual effects library for application created in or based on GWT. It is based on other open source library –

scriptaculous which is javascript solution for visual effects and html object manipulations. At the first glance GWTaculous is a java wrapper for javascript functions (JSNI) in scriptaculous library. But in fact it is complete solution with full java API (visual effects, effect queues, animation GWT event handlers etc). Let alone documentation and use examples. It also contains some minor bug fixes and will be updated with new visual effects. You don’t even have to know javascript to use it. Bring life to your user interface with a single line of code ! Read more on project home page: http://top.touk.pl/confluence/display/top/GWTaculous

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DDevelopment & Design

Distributed scans with HBase

HBase is by design a columnar store, that is optimized for random reads. You just ask for a row using rowId as an identifier and you get your data instantaneously. Performing a scan on part or whole table is a completely different thing. First of all, it is sequential. Meaning it is rather slow, because it doesn't use all the RegionServers at the same time. It is implemented that way to realize the contract of Scan command - which has to return results sorted by key. So, how to do this efficiently?HBase is by design a columnar store, that is optimized for random reads. You just ask for a row using rowId as an identifier and you get your data instantaneously. Performing a scan on part or whole table is a completely different thing. First of all, it is sequential. Meaning it is rather slow, because it doesn't use all the RegionServers at the same time. It is implemented that way to realize the contract of Scan command - which has to return results sorted by key. So, how to do this efficiently?
DDevelopment & Design

Zabawy zespołowe: ćwiczenie głosu – RYBA!

Ćwiczenie ma za zadanie ośmielić osoby do mówienia głośno i wyraźnie. Ma też pomóc ustawić głos. Bardzo przydatne przy spotkaniach typu stand-up, gdzie "mruki" opowiadają pod nosem, co ostatnio robiły. Z mojego doświadczenia - działa!

Osoby biorące udział w ćwiczeniu stają w okręgu. Wybieramy sobie słówko do powtarzania. Proponowana jest ryba, ale może to być dowolne inne, proste w wymowie słowo.
Prowadzący ustala kierunek i jako pierwszy mówi szeptem ryba. Następnie, kolejne osoby powtarzają rybę, aż do donośnego"RYBA. Jeśli warunki pozwalają, można nawet krzyczeć, ale nie wrzeszczeć, bo wtedy wymowa jest niewyraźna. Po osiągnięciu maksymalnego (w pewnym sensie, ustalonego poziomu), zaczynamy ściszać głos, aż do szeptu. Naturalnie zabawę można powtórzyć dowolną ilość razy.

Jako szept warto przećwiczyć szept aktorski, czyli używanie szeptu, ale głośnego i wyraźnego, bez tembru głosu.

Mając jedno ustalone słowo, fajnie jest potem mobilizować kogoś kto mówi zbyt cicho wołając tylko "ryba!" i wtedy wszystko wiadomo.
DDevelopment & Design

Need to make a quick json fixes – JSONPath for rescue

From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.

First of all you can try it without pain online: http://jsonpath.curiousconcept.com/. Full syntax is described at http://goessner.net/articles/JsonPath/



But also you can download python binding and run it from command line:
$ sudo apt-get install python-jsonpath-rw
$ sudo apt-get install python-setuptools
$ sudo easy_install -U jsonpath

After that you can use inside python or with simple cli wrapper:
#!/usr/bin/python
import sys, json, jsonpath

path = sys.argv[1]

result = jsonpath.jsonpath(json.load(sys.stdin), path)
print json.dumps(result, indent=2)

… you can use it in your shell e.g. for json:
{
"store": {
"book": [
      {
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
      },
      {
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
      },
      {
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
      },
      {
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
      }
    ],
"bicycle": {
"color": "red",
"price": 19.95
    }
  }
}

You can print only book nodes with price lower than 10 by:
$ jsonpath '$..book[?(@.price

Result:
[
  {
"category": "reference",
"price": 8.95,
"title": "Sayings of the Century",
"author": "Nigel Rees"
  },
  {
"category": "fiction",
"price": 8.99,
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"author": "Herman Melville"
  }
]

Have a nice JSON hacking!From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.