Most enterprises today are application centric. But the problem with the application is that their database schemas, user interfaces, programming interfaces and object models are tightly coupled and difficult to change. If you want to add a new field to a database table and you’re lucky, the change will reflect through the entire system. But often the change needs to be replicated manually across the entire system. And as applications are difficult to change, adding business rules or process to the application does not facilitate business agility. This is where layered architecture comes...

World leaders are those people who have extraordinary speaking skills and are a group of very busy people in most people's impression. But among them, there are a few who know how to program as well. Today we are going to summarize some of them.Lee Hsien Loong -- Singapore Prime MinisterLee Hsien Loong, Singapore Prime Minister posted a C++ program about Sudoku which he wrote several years ago. He shared the source code on Google Drive as well. In 1971, Mr. Lee studied Mathematics at Trinity College, University of Cambridge. He was Senior Wrangler in 197...

Usually, The purposes of log are for troubleshooting and displaying program running status. Good log will help us locate the error easier. Many programmers think log in programs is very simple, but it's not an easy task to write log codes to efficiently locate the error. Here we discuss about program log in three aspects:Where to logWhat to logLog styles to be avoidedWhere to log1. When calling external functionsWhen your program is calling some external functions which are not written by you, you need to log before and after the external function call. This will help debug.1. LOG.debug("Call...