Mastering High Performance with Kotlin

Benchmark state

Our testMethod() function is a simple example, but most of the time our method with a critical piece of code depends on a state. State is a set of variables on which our code depends, but we don't want to initialize them in a benchmark method, and we need to maintain this state while the benchmark is running. Since the JMH is heavily used to build benchmarks with concurrent code, the concept of state-bearing objects was implemented. To implement the state class, you need to follow these rules:

• The class must be declared as public
• You can't use inner classes, but you can use nested classes that are declared with the static modifier
• The class must have a public constructor without arguments

A state class contains state variables, ...