add jmh

build.gradle

@@ -2,6 +2,7 @@ import java.time.Duration
 
 plugins {
     id 'java-library'
+    id 'me.champeau.jmh' version '0.6.6'
     id 'maven-publish'
     id 'signing'
     id 'io.github.gradle-nexus.publish-plugin' version '1.1.0'
@@ -23,6 +24,14 @@ java {
     withJavadocJar()
 }
 
+tasks.withType(JavaCompile) {
+    options.encoding = 'UTF-8'
+}
+
+tasks.withType(Test) {
+    systemProperty 'file.encoding', 'UTF-8'
+}
+
 javadoc {
     options {
         addStringOption('Xdoclint:all,-missing', '-quiet')
@@ -44,6 +53,17 @@ test {
     useJUnitPlatform()
 }
 
+jmh {
+    jmhVersion = '1.34'
+    warmupIterations = 2
+    iterations = 5
+    fork = 1
+}
+
+tasks.withType(me.champeau.jmh.JmhParameters) {
+    jvmArgsAppend = ['-Dfile.encoding=UTF-8']
+}
+
 publishing {
     publications {
         MyPublication(MavenPublication) {

src/jmh/java/io/github/ititus/commons/lexer/LexerBenchmark.java

@@ -0,0 +1,19 @@
+package io.github.ititus.commons.lexer;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.infra.Blackhole;
+
+@State(Scope.Benchmark)
+public class LexerBenchmark {
+
+    @Benchmark
+    public void add(Blackhole bh) {
+        int a = 1;
+        int b = 2;
+        int sum = a + b;
+
+        bh.consume(sum);
+    }
+}