changed engine to instance variable, documented thread-safety; changed kotlin version

Author: Simon

build.gradle.kts

@@ -6,11 +6,11 @@ import org.gradle.api.publish.maven.MavenPom
 val kotlinVersion = plugins.getPlugin(KotlinPluginWrapper::class.java).kotlinPluginVersion
 
 project.group = "de.swirtz"
-project.version = "0.0.5"
+project.version = "0.0.6"
 val artifactID = "ktsRunner"
 
 plugins {
-    kotlin("jvm") version "1.2.51"
+    kotlin("jvm") version "1.3.10"
     `maven-publish`
     `java-library`
     id("com.jfrog.bintray") version "1.8.0"

src/main/kotlin/de/swirtz/ktsrunner/objectloader/KtsObjectLoader.kt

@@ -4,11 +4,13 @@ import java.io.InputStream
 import java.io.Reader
 import javax.script.ScriptEngineManager
 
+/**
+ *
+ * This class is not thread-safe, don't use it for parallel executions and create new instances instead.
+ */
 class KtsObjectLoader {
 
-    companion object {
-        val engine = ScriptEngineManager().getEngineByExtension("kts")
-    }
+    val engine = ScriptEngineManager().getEngineByExtension("kts")
 
     inline fun <reified T> load(script: String): T = engine.eval(script).takeIf { it is T } as T
             ?: throw IllegalStateException("Could not load script from .kts")

src/test/kotlin/de/swirtz/ktsrunner/objectloader/KtsObjectLoaderTest.kt

@@ -14,7 +14,7 @@ class KtsObjectLoaderTest {
 
     @Test
     fun `general ScriptEngineFactory test`() {
-        KtsObjectLoader.engine.factory.apply {
+        KtsObjectLoader().engine.factory.apply {
             assertEquals("kotlin", languageName)
             assertEquals(KotlinCompilerVersion.VERSION, languageVersion)
             assertEquals("kotlin", engineName)
@@ -33,7 +33,7 @@ class KtsObjectLoaderTest {
 
     @Test
     fun `simple evaluations should work`() {
-        with(KtsObjectLoader.engine as KotlinJsr223JvmLocalScriptEngine) {
+        with(KtsObjectLoader().engine as KotlinJsr223JvmLocalScriptEngine) {
             val res1 = eval("val x = 3")
             assertNull(res1, "No returned value expected")
             val res2 = eval("x + 2")