This article continues where Unary call sites and intention-revealing interfaces ended.

While reading David West’s excellent book “Object Thinking”, I stumbled across an interesting quote from David Parnas on the programming method that most of us use by default:

The easiest way to describe the programming method used in most projects today was given to me by a teacher who was explaining how he teaches programming. “Think like a computer,” he said. He instructed his students to begin by thinking about what the computer had to do first and to write that down. They would then think about what the computer had to do next and continue in that way until they had described the last thing the computer would do… […]

Call sites

One of the features I love most about my IDE is the button “Find Usages”. It is invaluable when improving a legacy code base. When used on a class it will show you where this class is used (as a parameter type, in an import statement, etc.). When used on a method, it will show you where this method gets called. Users of a method are often called “clients”, but when we use “Find Usages”, we might as well use the more generic term “call sites”.