reflectionBenchmark.java

Benchmark                    Mode  Cnt         Score        Error  Units
MyBenchmark.testReady       thrpt  200  65138596.553 ± 559898.434  ops/s
MyBenchmark.testReflection  thrpt  200    837419.902 ±  20471.042  ops/s

public class MyBenchmark {

    private static final String routingHashFunctionClass = "com.jenkov.DjbHashFunction";
    private static Method method;
    static {
        try {
            method = Class.forName(routingHashFunctionClass).getDeclaredMethod("hash", String.class);
        } catch (NoSuchMethodException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    @Benchmark
    public void testReflection(Blackhole blackhole) {
        try {
            Class<?> hashFunctionClass = Class.forName(routingHashFunctionClass);
            blackhole.consume(hashFunctionClass.getDeclaredMethod("hash", String.class).invoke(null,"test"));
        } catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    @Benchmark
    public void testReady(Blackhole blackhole) {
        try {
            blackhole.consume(method.invoke(null,"test"));
        } catch (IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}