In order to meet relevant requirements in the area of real-time dynamic scheduling,a novel approach was proposed to enable real-time programs to estimate their own remaining worst-case execution times(RWET) by means of code instrumentations.

This paper introduces the background of code instrumentation technology and gives a brief comparison between manual and automatic instrumentation at first.

The path constraints are collected and generated through code instrumentation during the application execution,and new path constraints are generated with a search algorithm and solved,which constructs new inputs that can steer the application to follow alternative execution paths.

This paper introduces the development of a website visitor volume service system integrating code insertion technology,component technology,AJAX and JFreeChart technologies.