Implement business logic with the Drools rules engine
Use a declarative programming approach to write your program's business logic
Using a rules engine can lower an application's maintenance and extensibility costs by reducing the complexity of components that implement complex business logic. This updated article shows you how to use the open source Drools rules engine to make a Java™ application more adaptive to changes. The Drools project has introduced a new native rule expression language and an Eclipse plug-in, making Drools easier to use than ever before.
Most of the complexities that requirements impose on today's software products are behavioral and functional, resulting in component implementations with complex business logic. The most common way to implement the business logic in a J2EE or J2SE application is to write Java code that realizes the requirements document's rules and logic. In most cases, this code's intricacy and complexity makes maintaining and updating the application's business logic a daunting task, even for experienced developers. And any change, however simple, incurs recompilation and redeployment costs.
A rules engine helps you resolve (or at least reduce) the issues and difficulties inherent in the development and maintenance of an application's business logic. You can think of a rules engine as a framework for implementing complex business logic. Most rules engines let you use declarative programming to express the consequences that are valid given some information or knowledge. You can concentrate on facts that are known to be true and their associated outcomes — that is, on an application's business logic.
Several rules engines are available, including commercial and open source choices. Commercial rules engines usually let you express rules in a proprietary English-like language. Others let you write rules using scripting languages such as Groovy or Python. This updated article introduces you to the Drools engine and uses a sample program to help you understand how to use Drools as part of your business logic
Drools is an open source rules engine, written in the Java language, that uses the Rete algorithm to evaluate the rules you write (see Resources). Drools lets you express your business logic rules in a declarative way. You can write rules using a non-XML native language that is quite easy to learn and understand. And you can embed Java code directly in a rules file, which makes the experience of learning Drools even more attractive. Drools also has other advantages. It is:
http://www.ibm.com/developerworks/java/library/j-drools/
Reference Sites:
http://en.wikipedia.org/wiki/Drools
http://java-source.net/open-source/rule-engines/drools
http://java-source.net/open-source/rule-engines
http://www.jboss.org/drools/documentation.html
http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.html#d0e65
http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html/index.html
http://blog.athico.com/2007/11/how-big-is-too-big.html
http://www.onjava.com/pub/a/onjava/2005/08/03/drools.html?page=1
SAVE ENERGY • SAVE MONEY • REDUCE GREENHOUSE GASES
SIX SIMPLE THINGS EVERYONE CAN DO:
DURING EACH DAY
1. Enable Energy Star or Power Management features on your computer where feasible.
Help save $140,000 and 560,000 kg of carbon dioxide per year by activating Energy Star or power management features on your computer. Energy Star puts the computer into sleep mode after a period of inactivity and is generally activated through screen saver setting panels.
2. Turn off the lights when a room is not in use for more than 5 minutes or if there is sufficient daylight.
It is a myth that fluorescent tubes use so much energy upon start-up that it is not worth switching them off.
AT THE END OF EACH DAY
3. Turn OFF :
• The lights - Few buildings have automatic systems that turn off lights.
• Your computer - If that computer or monitor light is on, it is still using power!
• Your monitor
• Laptops at the powerpoint
• Nearby photocopiers - Measurements have found that many photocopiers and
• Nearby printers - printers save little energy when in "power saver" mode.
WHEN WORKING AFTER HOURS
4. Light only your area (and access areas).
Light switches should activate selected areas only. Diagrams representing the selected areas should be easy to understand, clearly visible and mounted next to or near the switches in question.
5. Minimise air conditioner use. This one action can make a big difference.
6. Don't leave lights and equipment running once you have left the building.
Most after hours lighting and air conditioning switches can be used to turn equipment off as well as on.
Everyone can have an impact. By doing these simple things, together we can reduce the energy use by 5% ($1.5 million pa) and carbon dioxide emissions by 6 million kilograms every year.
Top Replies by Programmers when their programs don't work :
This story is about a man who once upon a time was selling Hotdogs by the
roadside. He was illiterate, so he never read newspapers. He was hard of
hearing, so he never listened to the radio. His eyes were weak, so he never
watched television. But enthusiastically, he sold lots of hotdogs. He was
smart enough to offer some attractive schemes to increase his sales. His
sales and profit went up. He ordered more a more raw material and buns and
sold more. He recruited more supporting staff to serve more customers. He
started offering home deliveries. Eventually he got himself a bigger and
better stove. As his business was growing, the son, who had recently
graduated from college, joined his father.
Then something strange happened.
The son asked, "Dad, aren't you aware of the great recession that is coming
our way?" The father replied, "No, but tell me about it." The son said,
"The international situation is terrible. The domestic situation is even
worse. We should be prepared for the coming bad times."
The man thought that since his son had been to college, read the papers,
listened to the radio and watched TV. He ought to know and his advice
should not be taken lightly.. So the next day onwards, the father cut down
the his raw material order and buns, took down the colourful signboard,
removed all the special schemes he was offering to the customers and was no
longer as enthusiastic. He reduced his staff strength by giving layoffs.
Very soon, fewer and fewer people bothered to stop at his Hotdog stand. And
his sales started coming down rapidly and so did the profit. The father
said to his son, "Son, you were right. We are in the middle of a recession
and crisis. I am glad you warned me ahead of time."
Moral of the Story: Its all in your MIND! And we actually FUEL this
recession much more than we think.
How Rahman composes a melodious tune
1. Rahman gets an offer from the director , and he studies the script everything . If he likes it then he agrees else he drop down the offer
2. Then he sees the actor/actress and accordingly determines the singer.
3. Rahman asks the director to give the exact situation of the song and why it is needed. If he is satisfied, then he proceeds.
4. Then Rahman sits and composes the song on his own and in his voice records every song.
5. Calls the singers after 12 am in the night [Mark it only after 12 am] and makes them hear the tunes.
6. Recording starts . He never modifies the song as per the singer but he modifies the singer as per the song .
7. Every sound in the studio is recorded even if a singer sneezes or coughs it is recorded and it is edited . If u remember in Kadhal Virus there is a song by Mano~ O Kadhale. There he coughs at one part. He had coughed it in the first day and then Rahman never got any realistic cough after that so he simply included the original cough.
8. A song recording goes upto 3-4 days . Sometimes male and female singers are recorded differently and then successfully mixed
9. After the vocal is over music starts . He gives his idea to his musicians and then the musicians suggest the background tune . 90% times Rahman doesn't like them and then he himself gives them notes and the musician have to play them. Few songs however had tunes inspired by his musicians like his flutist Naveen and drummer Sivamani. The musicians love ARR since he gives them freedom and helps them grow their talent .
10.Later the vocal is added to music or vice versa and then comes the technical part. Every interfaces start working , every part is edited , reedited and software are used and lets not get much into it ,but by the time a song is finalized it is one month and the best version is out. Some say he uses technology, but come to his studio you will know he uses technology only to polish stuffs.
http://rahmaniac.wordpress.com/2008/06/28/how-a-r-rahman-composes-a-tune-for-his-film/
Rounding the last defender, Raja Chinnaswamy looks up towards the iron frame of the goal in the lee of the white-washed wall of the orphanage behind. He pulls back his right foot and lets fly, sending the ball hurtling past the goalkeeper and out through the gaping hole in the torn netting.
Eight years ago, when he first arrived at the orphanage in the southern Indian state of Kerala, Raja had never seen a football. Today he is a rising star of Indian football, a 14-year-old already being talked about by his excited coaches as a future fixture in the national team.
Indian football's moment may be coming. Last year the country qualified for the finals of the Asian Cup for the first time since 1984. English Premiership clubs have also woken up to the fact that the subcontinent might have something to offer the world of football. Clubs such as Manchester United and Chelsea are moving into India, hoping to unearth the same wealth of talent that Africa has offered up, and to cash in on a vast untapped market of one billion people.
Yet the Indian national football team still languishes at 143 in the Fifa rankings, below the South Pacific island of Vanuatu, the Cape Verde Islands and Swaziland. Indian football desperately needs a hero, its own David Beckham or Cristiano Ronaldo. In Raja, it may finally have found one.
In a country which remains obsessed with cricket, the fact that a teenage boy wants to play football might be considered unusual enough. But the story of Raja is so extraordinary that it would not be out of place in a Bollywood movie.Born in Tamil Nadu in 1994, he was four when his mother was poisoned by her family for marrying below her caste. A couple of years later his father fell ill and lost his job at a sugar cane factory.
Hoping their luck would change, the boy and his father headed for the town of Thrissur in Kerala, but quickly found themselves penniless and on the streets. With his father too ill to work, Raja turned to begging. "I never thought about it," he said. "It was the only thing to do. Sometimes people would give me money and sometimes they would slap me." If he was lucky, he would make 100 rupees a day, but Raja was anything but lucky. Some of the other street children spotted him begging at the station. They told the gullible six-year-old they could get him a job and one for his father. Instead they took him to meet the boss of the local begging mafia, a man also called Chinnaswamy, behind a row of shops. The man threatened him and warned him against trying to escape.
"He said I had to give him 100 rupees a day or he would kill my father," Raja said. If he tried to escape, he was told, the other children would inform on him. One day Raja failed to hit his target. His father was sick with a fever and the boy needed to care for him.
"In the evening I went begging and went to see Chinnaswamy to give him the 50 rupees I had made. He tied me to a stove and hit me with an iron rod," he said. Chinnaswamy had gathered the other children round to watch, to make sure that they learned the lesson. The rod was heated on the stove until it was red hot. Raja rolls down his sock to show the scars. There is another scar to the left of one eye from where he was burned with a cigarette.
If anyone needed a break, it was Raja. Finally he got one. A friendly bookseller found him sobbing in the street and took pity on him. He knew of an orphanage where the boy would be safe. It was Raja's good fortune that the Janaseva Boys' Home in Madhurappuram was run by a former international athlete, Jose Maveli, whose passion for sport had not diminished at the same rate as his physical abilities.
Maveli offered the 100 or so boys who lived there a chance of an education, but, more importantly for Raja, sports training. It was not long before his natural footballing talents were spotted by a couple of former Indian footballing internationals roped in by Maveli to lend a hand with the coaching.
"He is a very speedy player with the ball and a very good goal-getter," said Soly Xavier, who played right back for the national side from 1986 to 1989. "He thinks about positioning and is always watching the other players. Whenever he gets an opportunity, he scores a goal. Within a year and a half he will be in the national side."
Last September, Raja was selected for the state football team: "I was happy and crying. Many of the players were crying because they had not been selected, but I was crying because I had."
Now trials for the Indian national side are beckoning. Neither Raja nor his coaches doubt that he will make it. "I will definitely play for India. I can do it," he says. And he trots off towards the centre circle of the red dirt pitch carved out of a scrap of land surrounded by palm trees in one of the most beautiful parts of a country that does not yet care about football - but may soon have something to cheer about.
http://www.guardian.co.uk/world/2009/jan/04/raja-chinnaswamy-india-football-star
Hope, is only till we loose it!Trust, is only till we belive it!Love, is only till we feel it!but friendship is forever....