JMH-based set of benchmarks

build.gradle

@@ -4,6 +4,7 @@ plugins {
     id 'signing'
     id 'jacoco'
     id 'com.github.kt3k.coveralls' version '2.12.0'
+    id "me.champeau.jmh" version "0.6.6"
 }
 
 group = 'com.nulab-inc'
@@ -23,6 +24,9 @@ repositories {
 
 dependencies {
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'
+    jmh group: 'org.openjdk.jmh', name: 'jmh-core', version: '1.34'
+    jmh group: 'org.openjdk.jmh', name: 'jmh-generator-annprocess', version: '1.34'
+    jmh group: 'org.ow2.asm', name: 'asm', version: '9.3'
 }
 
 task compileModuleInfoJava(type: JavaCompile, dependsOn: compileJava) {

src/jmh/java/com/nulabinc/zxcvbn/RandomPasswordMeasureBenchmark.java

@@ -0,0 +1,52 @@
+package com.nulabinc.zxcvbn;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+
+import java.io.IOException;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MILLISECONDS)
+@State(Scope.Thread)
+@Warmup(iterations = 2)
+@Measurement(iterations = 3)
+@Fork(1)
+public class RandomPasswordMeasureBenchmark {
+
+    @Param({"8", "32", "128", "512", "1024"})
+    private int passwordLength;
+    private String password;
+    Zxcvbn zxcvbn;
+
+    @Setup
+    public void setup() throws IOException {
+        zxcvbn = new ZxcvbnBuilder()
+                .dictionaries(StandardDictionaries.loadAllDictionaries())
+                .keyboards(StandardKeyboards.loadAllKeyboards())
+                .build();
+
+        Random random = new Random(42);
+        StringBuilder sb = new StringBuilder(passwordLength);
+        for (int i = 0; i < passwordLength; i++) {
+            char c = (char) (random.nextInt() % Character.MAX_VALUE);
+            sb.append(c);
+        }
+        password = sb.toString();
+    }
+
+    @Benchmark
+    public Strength measure() {
+        return zxcvbn.measure(password);
+    }
+}