convert Utils.java -> Utils.kt

src/test/java/com/alibaba/ttl/perf/Utils.java

-package com.alibaba.ttl.perf;
-
-import java.util.Random;
-
-/**
- * @author Jerry Lee (oldratlee at gmail dot com)
- */
-public class Utils {
-    private static Random random = new Random();
-
-    private static String bytes2Hex(byte[] bytes) {
-        StringBuilder sb = new StringBuilder(1024);
-        for (byte b : bytes) {
-            String s = Integer.toHexString(b & 0xFF);
-            sb.append((s.length() == 1) ? "0" + s : s);
-        }
-        return sb.toString();
-    }
-
-    private static byte[] getRandomBytes() {
-        byte[] bytes = new byte[1024];
-        random.nextBytes(bytes);
-        return bytes;
-    }
-
-    public static String getRandomString() {
-        return bytes2Hex(getRandomBytes());
-    }
-
-    private Utils() {
-    }
-}

src/test/java/com/alibaba/ttl/perf/Utils.kt

+package com.alibaba.ttl.perf
+
+import java.util.*
+
+private val random = Random()
+
+internal fun bytes2Hex(bytes: ByteArray): String {
+    val sb = StringBuilder(1024)
+    for (b in bytes) {
+        val s = Integer.toHexString(b.toInt() and 0xFF)
+        sb.append(if (s.length == 1) "0$s" else s)
+    }
+    return sb.toString()
+}
+
+internal fun getRandomBytes(): ByteArray {
+    val bytes = ByteArray(1024)
+    random.nextBytes(bytes)
+    return bytes
+}
+
+internal fun getRandomString(): String {
+    return bytes2Hex(getRandomBytes())
+}
+

src/test/java/com/alibaba/ttl/perf/memoryleak/NoMemoryLeak_ThreadLocal_NoRemove.kt

@@ -2,7 +2,7 @@
 
 package com.alibaba.ttl.perf.memoryleak
 
-import com.alibaba.ttl.perf.Utils
+import com.alibaba.ttl.perf.getRandomString
 
 /**
  * @author Jerry Lee (oldratlee at gmail dot com)
@@ -11,7 +11,7 @@ fun main(args: Array<String>) {
     var counter: Long = 0
     while (true) {
         val threadLocal = ThreadLocal<String>()
-        threadLocal.set(Utils.getRandomString())
+        threadLocal.set(getRandomString())
 
         if (counter % 1000 == 0L)
             System.out.printf("%05dK%n", counter / 1000)

src/test/java/com/alibaba/ttl/perf/memoryleak/NoMemoryLeak_TransmittableThreadLocal_NoRemove.kt

@@ -3,7 +3,7 @@
 package com.alibaba.ttl.perf.memoryleak
 
 import com.alibaba.ttl.TransmittableThreadLocal
-import com.alibaba.ttl.perf.Utils
+import com.alibaba.ttl.perf.getRandomString
 
 /**
  * @author Jerry Lee (oldratlee at gmail dot com)
@@ -12,7 +12,7 @@ fun main(args: Array<String>) {
     var counter: Long = 0
     while (true) {
         val threadLocal = TransmittableThreadLocal<String>()
-        threadLocal.set(Utils.getRandomString())
+        threadLocal.set(getRandomString())
 
         if (counter % 1000 == 0L)
             System.out.printf("%05dK%n", counter / 1000)

src/test/java/com/alibaba/ttl/perf/tps/CreateThreadLocalInstanceTps.kt

@@ -2,7 +2,7 @@
 
 package com.alibaba.ttl.perf.tps
 
-import com.alibaba.ttl.perf.Utils
+import com.alibaba.ttl.perf.getRandomString
 
 /**
  * @author Jerry Lee (oldratlee at gmail dot com)
@@ -12,7 +12,7 @@ fun main(args: Array<String>) {
 
     tpsCounter.setAction(Runnable {
         val threadLocal = ThreadLocal<String>()
-        threadLocal.set(Utils.getRandomString())
+        threadLocal.set(getRandomString())
     })
 
     while (true) {

src/test/java/com/alibaba/ttl/perf/tps/CreateTransmittableThreadLocalInstanceTps.kt

@@ -3,7 +3,7 @@
 package com.alibaba.ttl.perf.tps
 
 import com.alibaba.ttl.TransmittableThreadLocal
-import com.alibaba.ttl.perf.Utils
+import com.alibaba.ttl.perf.getRandomString
 
 /**
  * @author Jerry Lee (oldratlee at gmail dot com)
@@ -13,7 +13,7 @@ fun main(args: Array<String>) {
 
     tpsCounter.setAction(Runnable {
         val threadLocal = TransmittableThreadLocal<String>()
-        threadLocal.set(Utils.getRandomString())
+        threadLocal.set(getRandomString())
     })
 
     while (true) {

src/test/java/com/alibaba/ttl/perf/tps/TpsCounter.kt

 package com.alibaba.ttl.perf.tps
 
+import org.junit.Assert.fail
 import java.util.concurrent.ExecutorService
 import java.util.concurrent.Executors
 import java.util.concurrent.TimeUnit
 import java.util.concurrent.atomic.AtomicLong
 
-import org.junit.Assert.fail
-
 /**
  * @author Jerry Lee (oldratlee at gmail dot com)
  */

src/test/java/com/alibaba/ttl/user_api_test/TransmittableThreadLocal_Transmitter_UserTest.kt

@@ -108,6 +108,7 @@ class TransmittableThreadLocal_Transmitter_UserTest {
         }
 
         @AfterClass
+        @Suppress("unused")
         fun afterClass() {
             executorService.shutdown()
             executorService.awaitTermination(100, TimeUnit.MILLISECONDS)